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&size(25){''NIC Observers' Manual''};
* Contents [#f3218243]
#contents
Throughout this document, observers are assumed to log in...
* The simplest case (for impatience) [#h17a4174]
+ Point the telescope towards the target.
+ Log in to 160.128.0.40 (nicpc) via ssh with the usernam...
obs3% ssh -X nicop@nicpc
+ Launch DS9 to view the images.
nicpc% ds9 &
+ Run the observing command.
For the case w/o dithering, Mode 3, 5-sec exposure:
nicpc% Lo 3 5
- The images are stored into the directory assigned to th...
* Imaging observations (w/o polarimetry) [#h26108c8]
** Check the status of NIC [#v8b1c816]
- The powers of NIC control PC, VME rack, analogue circui...
- The power of the motor-drive circuit is usually ON as w...
- The power of the vacuum monitor can be turned OFF.
** Start the Nayuta Telescope [#cfe3bd21]
- Turn all the power switches of TCC ON.
- Launch the UCC (type 'ucc_run' from the console).
- Click the Near-IR observation mode button [近赤外線観測]
- Select the menu [観測補助]=>[観測開始] on the NIR-mode ...
-- Many autoguider-related error messages will appear, bu...
- Synchronise the enclosure with the telescope by clickin...
** Log in to the NIC control PC [#m6d63ca2]
- Access the nicpc (160.128.0.40) from obs3 via ssh with ...
obs3% ssh -X nicop@nicpc (from obs3)
% ssh -X nicop@160.128.0.40 (from other computers)
- It is useful to launch another terminal on nicpc, prior...
nicpc% xterm &
nicpc% xgterm &
...as you like.
- If you have just turned ON the VME rack, run the follow...
nicpc% cg3_init
** Launch DS9 to view the images. [#e5f0adb3]
nicpc% ds9 -options-as-you-like &
You can optimise the sizes and configuration of the three...
** Test exposure [#mc57fe99]
nicpc% TL 3 2
- After some seconds, three images corresponding to J-, H...
- The images may look somewhat unusual if you have just t...
** Open the cold shutter [#q7b18ecd]
- Open the shutter with the following command on nicpc.
nicpc% darkshutter.py --open
(turn the CLD on, and wait for 10 sec)
(test exposure begins automatically)
Type 'o', 'p', 'open', 'close', etc., following the prom...
- The power of the CLD is turned off automatically.
- (alternative way) You can also do the same thing manual...
++ Type the following commands to turn the CLD on, and op...
nicpc% ipmint.sh --on 3
(The status of IPPower is displayed. CLD's is connecte...
(Wait for 10sec)
nicpc% shutter open
++ If the counts are ~0, the shutter might be closed. If ...
nicpc% shutter -init
++ When you confirm that the shutter is open, turn the po...
nicpc% ipmint.sh --off 3
** Retract the polarisation plate [#o7a89404]
nicpc% pol out
** Target acquisition. [#fabec191]
- You can use the UCC (GUI), ''pinpoint'' command on obs3...
-- Coarse focusing should be done before running the ''pi...
obs3% tempfocus nic
-- Be sure to adjust the position angle on the sky before...
-- The new acquisition command 'pinpoint' has been implem...
obs3% pinpoint nic <object_list_name_on_UCC> '<OBJECT_NA...
- If you use the remote command from nicpc, prepare the l...
-- One object per line. The format should be "Object_name...
(ex.) NGC2770 2000.0 9 09 33.709 +33 07 24.71
-- Save the list to the file named, e.g., my_objlist, and...
nicpc% point2 my_objlist NGC2770
** Set the position angle of the FoV [#e486a9fd]
- If you are using the ''pinpoint'' command described abo...
- If you are using the UCC (GUI) for acquisition, set the...
- Input 0 to the PA to be set [指令位置角 in Japanese]=>[...
-- The rotator can move only from -270 deg to +270 deg. &...
-- If you slue the telescope largely, cancel the AZ/EL sy...
- [実位置角 (current PA)] [指令位置角(PA to be set)] on t...
- [実角度 (current PA)] [指令角度 (PA to be set)] in the ...
** Test exposure to examine the acquisition [#o5fb8679]
- You can usually ignore this section if you are using ''...
- Type the following command on nicpc. See below for deta...
nicpc% TL <mode> <exptime>
- <mode> means the read-out mode. For test exposure, the ...
(ex.) test exposure with mode 3 and 10sec exposure:
nicpc% TL 3 10
** Focusing [#fc6069d6]
All the commands will run on nicpc. Note that they do not...
- Estimate the coarse focus position with calfocus.sh com...
nicpc% calfocus.sh dome_temp(degC)
- Move the focus to the prior position using focus comman...
nicpc% focus focus_position
- Take the images with several focus positions, measure t...
nicpc% autofocus exp_time band(秒) focus_start focus_end...
- This procedure sometimes fails, due to the failure of m...
-- In such case you should adjust the focus manually with...
- Example: The case with temperature=12.3degC
++ Estimate the empirical focus position as a prior
nicpc% calfocus.sh 12.3
=> Estimated focus: -5.3887
++ Move the focus to the prior position. (You can also do...
nicpc% focus -5.39
++ Estimate the best position with autofocus command.
--- Click the star to be measured on DS9 window.
nicpc% autofocus 3 j -5.5 -5.4 5
--- In this case the focus is set to five positions betwe...
--- See [[this page (Japanese)>ソフトウェアの説明#autofoc...
** Adjust the pointing offset (if needed) [#acb67d7b]
- There are some gaps of the background counts between th...
- The orientation, scale are as follows:
-- If you set the PA to 0 deg, synchronising with AZ/EL, ...
-- If you want to move the star rightwards on the image, ...
-- If you want to move the star upwards on the image, set...
-- The FoV is 2.7arcmin * 2.7arcmin, and the pixel scale ...
- There are three ways to do this.
- Method 1: Use xyoffset2 command
++ After test exposure (e.g., TL command), type the follo...
nicpc% xyoffset2 (no arguments)
++ Click the 'current position of the star (start)' on DS...
++ The offset between the start and goal is calculated, a...
++ Confirm the offset by taking test exposure using, e.g....
- Method 2: Use the UCC
-- Input the offset values (alpha, delta) into the [オフ...
- Method 3: Use the handset (not very useful)
++ On UCC, click [ハンドセット]=>[有効]=>[実行]
++ Press the [ENABLE] button. [MODE] should be set to [al...
++ Adjust the pointing with [CONTROL BUTTON]
** Take and check the imaging data [#hbb8221d]
- Use Lo / DL command. If you just want to test and do no...
: ''Lo'' command | No dither, take the specified number o...
: ''DL'' command | With dithering, dither along the circl...
: ''TL'' command | Test exposire, without saving.
*** Lo command usage [#l1270390]
> This command does not do any dithering, so that the sam...
nicpc% Lo mode exptime(sec) [object_name [num]]
- object_name will be the OBJECT keyword value in the FIT...
- num specifies the number of exposures to be taken. num ...
- (Example) Take 10 frames of NGC2770 with 30sec exposure...
nicpc% Lo 3 30 NGC2770 10
-- This gives 10 frames each for J, H and K, 30 FITS file...
*** DL command usage [#kf7ccadb]
> This command is for dithering observations.
nicpc% DL mode exptime [object_name [dith_num [dith_radi...
- dith_num specifies the number of dithering points. 10 i...
- dith_radius specifies the dithering radius. 10 arcsec i...
- (Example) Take 10 NGC2770 frames with mode 3 and 30sec ...
nicpc% DL 3 30 NGC2770 10 10
-- Dithering pattern is 'one at centre, nine along the ci...
-- After finishing the dithering set, the telescope gets ...
-- If you want to use the pipeline script 'nicred.sh' and...
- An example of dithering patter is shown below. This exa...
#ref(./Dither_Pattern.jpg,50%);
*** Read-out mode [#t158a89c]
> The mode is common parameter for all the observing comm...
The mode should be one of 3/4/43/44/83/84, i.e., (blank/4...
(&color(red){In short, mode 83 takes longer time, but giv...
- Outline
mode 3: Same exposure time for all JHK bands
mode 4: Different exposure time for individual bands
mode 43: Same exposure time, averaging over 4 times of F...
mode 44: Different exposure time, averaging over 4 times
mode 83: Same exposure time, averaging over 8 times
mode 84: Different exposure time (NOT all the three can ...
- Limitations of the exposure time for each mode
-- The exposure time cannot be shorter than the read-out ...
mode 3, 4: 2 sec
mode 43, 44: 8 sec
mode 83, 84: 16 sec
-- If you specify the different exposure times, the diffe...
mode 4 : One exposure must be >2 sec longer than ...
mode 44: One exposure must be >8 sec longer than a...
mode 84: One exposure must be >16 sec longer than ...
-- For all modes, the exposure time ''cannot exceed 257 s...
-- The linearity of the detector is known to be degraded ...
--- [[Ishiguro et al. (2011)>http://www.nhao.jp/nhao/rese...
- Brief description for mode 3 & 4
-- Both modes performs CDS (Correlated Double Sampling).
> ''mode 3''
-- Take the J-, H- and K-band images simultaneously with ...
-- Exposure and readout are done with the following schem...
reset, x, read1, exposure, read2
reset: flash the detector signal to reset the...
x: readout the blank frame
The effective exposure is made between ''read1'' and ''re...
> ''mode 4''
-- Take the three bands specyfying the individual exposur...
nicpc% DL 4 60,40,20 NGC2770 5 (J=60, H=40, K=20sec, d...
-- Exposure and readout are done with, e.g., the followin...
reset, x, read1_jhk, exp1, read_k, exp2, read_h, exp3,...
The effective exposure is made between ''read1_jhk'' and ...
- Brief description for mode 43 & 44
--Both modes require that the exposure is longer than 8 s...
Mode 44 further requires that one exposure is longer than...
---mode 43: Same exposure time for all JHK bands, averagi...
---mode 44: Individually specified exposure times, with t...
> ''mode 43'' (and mode 44)
- Exposure and readout for mode 43 are done with the foll...
reset, x, r1, r2, r3, r4, exp, r5, r6, r7, r8
- The effective exposure is made between, e.g., the begi...
- Mode 44 does the same thing with exposure times individ...
- Brief description for mode 83 & 84
--mode 83: Same exposure time for JHK, Fowler Sampling, a...
--mode 84: Individually specified exposure times, with th...
Lo 84 120,90,60 NGC2770 4 ===> NG.
Lo 84 120,120,60 NGC2770 4 ===> OK.
-- Both modes require exposure time longer than 16 sec.
Mode 84 further requires that one exposure time is more t...
> ''mode 83'' (and mode 84)
- Exposure and readout for mode 83 are done with the foll...
reset, x, x, r1, r2, r3, ..., r8, exp, r9, r10, r11, ....
- The effective exposure is made between, e.g., the begin...
- Mode 84 does the same thing with exposure times individ...
** Take the separate sky frame (if needed) [#m3807d18]
- If the target field is crowded with many stars, the sky...
- If you want to use nicred.sh (the pipeline script), set...
(target field) nicpc% DL 83 30 XYZ 10 10
(sky field) nicpc% DL 83 30 XYZ_sky 10 10
** Take the flat frame [#t9a0072a]
- We recommend to use twilight flat.
- The linearity of the detectors is known to break when t...
- To cancel out the detectors' systematic patterns, prepa...
** Take the dark frame [#hd80e75a]
- We strongly recommend to set the telescope to EL=90deg ...
-- If you close the shutter at the elevation (EL) other t...
- Close the cold shutter
nicpc% darkshutter.py
-- This command turns on the power of the CLD, enabling t...
-- After waiting for 10 sec, the shutter moves to the 'cl...
-- TL command will automatically run, so that you can adj...
+++ The example below shows the dark frame with the prope...
#ref(./NIC_DARK_OK.png,70%);
+++ Below is another example with the wrong position of t...
In this case you should move the shutter slightly towards...
#ref(./NIC_DARK_NG.png,65%);
-- When the test images are displayed, input the followin...
p [step_number] : Move the shutter towards the 'pol' dir...
o [step_numner] : Move the shutter towards the 'open' di...
open : Move the shutter to 'open' position.
close : Move the shutter to 'close' position.
pol : Move the shutter to 'pol' position.
init : Initialise the shutter position (move to the orig...
q : Accept and quit.
-- The CLD power will be turned off when exiting the prom...
- (for reference) How to close the shutter manually
++ Close the shutter
nicpc% ipmint.sh --on 3
nicpc% shutter close
++ Run the TL command to test if the shutter is on the pr...
-- Take several frames by changing the exposure time. If ...
--- You may find (especially when you take longer exposur...
#ref(./NIC_DARK_OK.png,70%);
-- You may sometimes find rectangular pattern like that s...
#ref(./NIC_DARK_NG.png,65%);
-- If you find any unwanted lights in the test images, mo...
--- Launch the shutter GUI.
nicpc% shuttergui &
--- Slide the 'steps' bar on GUI window to adjust the ste...
--- Click "To open" or "To pol" button to move the shutte...
--- Run TL command to test if the unwanted lights are com...
--- After setting the shutter to the proper position, be ...
nicpc% ipmint.sh --off 3
- Take the dark frames:
-- If you use the pipeline script (nicred.sh), set the ob...
nicpc% Lo 3 20 DARK 15
-- The readout mode and the exposure time should be the s...
-- nicpc has a shell script named 'darkscript.sh' to gene...
//-- nicpc には、最後のシャッター open も含めて自動でダー...
nicpc% darkscript.sh
--- This reads the exposure times from the data taken at ...
--- Be sure to confirm that the shutter is properly close...
nicpc% /home/nicop/obs_script/DARK[YYMMDD].sh
(The name of the script is displayed after running darks...
--- The script generated here contains 'shutter open' com...
* Finish the observations [#aecd5dbc]
** Open the shutter, and retract the polarisation plate ...
nicpc% darkshutter.py -o
(check the test images, adjust with 'o', 'p', etc., if...
(check the test images, exit with 'q')
nicpc% pol out
- This process is not needed if you run the dark script d...
- However, for the case the shutter stacks at the wrong p...
** Log out from nicpc [#iac6057f]
- Close all the windows running on nicpc (ds9, xterm, kte...
nicpc% logout
Be sure to do this after the dark script is finished (i.e...
** Shut down the telescope [#n00ccfa3]
** Before going home... [#y3708c92]
See the [[check list>staff/なゆた観測終了時にチェックする...
* Data reduction [#f712a1b4]
- Basic procedures are summarised in the following pages.
-- [[Japanese version>NIC解析マニュアル]]
-- [[English version>Data_Reduction_Manual]]
*Other miscellaneous information [#q5f72461]
** Data storage [#mfa1b61a]
- All the data are stored into the directory /data/YYMMDD...
- The files are named according to the sequential number ...
(example) For the 35th H-band frame taken at 2019-09-13
directory: /data/190913/rawdata/
filename: h190913_0035.fits
- The directory of the date is automatically generated wh...
- The date is switched to the next day at 8:00 a.m. next ...
** How to stop the integration [#x4d44980]
- Suppose you started integration by typing the following...
nicpc% DL 84 60,60,30 NGC2770 10 10
but you want to stop this for some reasons.
- From other terminal window, type the following command:
nicpc% xstop
Then, if you are lucky enough, the integration (set of un...
-- Note that you cannot stop the on-going exposure with t...
- If you want to stop the integration immediately, try Ct...
-- The data of the current integration will be lost when ...
-- The frame ID number of the current integration will be...
-- We basically do not strongly recommend to do this.
//どうしても積分をすぐに止めたい場合は
// cogito3_reset
//としてみるとか?
*Revision history [#m9489cf5]
-20110730 T.Zenno: Created (nic_observe.txt)
-20120502 J.Takahashi: Added the procedures to start the...
-20120516 J.Takahashi: Re-formatted to wiki
-20120517 J.Takahashi: Revised according to the change o...
-20120628 J.Takahashi: Added 'Finish the observaions' se...
-20120704 J.Takahashi: Modified the log-in procedures
-20130316 J.Takahashi: Added the log-in procedures using...
-20180212 T.Saito: Fully revised and re-formatted by inc...
-20180312 J.Takahashi: Revised according to the recent u...
-20190518 T.Saito: Added automated shutter command inclu...
-20190913 T.Saito: Translated to English
---
終了行:
[[Back to NIC Top>NIC-Top]]
&size(25){''NIC Observers' Manual''};
* Contents [#f3218243]
#contents
Throughout this document, observers are assumed to log in...
* The simplest case (for impatience) [#h17a4174]
+ Point the telescope towards the target.
+ Log in to 160.128.0.40 (nicpc) via ssh with the usernam...
obs3% ssh -X nicop@nicpc
+ Launch DS9 to view the images.
nicpc% ds9 &
+ Run the observing command.
For the case w/o dithering, Mode 3, 5-sec exposure:
nicpc% Lo 3 5
- The images are stored into the directory assigned to th...
* Imaging observations (w/o polarimetry) [#h26108c8]
** Check the status of NIC [#v8b1c816]
- The powers of NIC control PC, VME rack, analogue circui...
- The power of the motor-drive circuit is usually ON as w...
- The power of the vacuum monitor can be turned OFF.
** Start the Nayuta Telescope [#cfe3bd21]
- Turn all the power switches of TCC ON.
- Launch the UCC (type 'ucc_run' from the console).
- Click the Near-IR observation mode button [近赤外線観測]
- Select the menu [観測補助]=>[観測開始] on the NIR-mode ...
-- Many autoguider-related error messages will appear, bu...
- Synchronise the enclosure with the telescope by clickin...
** Log in to the NIC control PC [#m6d63ca2]
- Access the nicpc (160.128.0.40) from obs3 via ssh with ...
obs3% ssh -X nicop@nicpc (from obs3)
% ssh -X nicop@160.128.0.40 (from other computers)
- It is useful to launch another terminal on nicpc, prior...
nicpc% xterm &
nicpc% xgterm &
...as you like.
- If you have just turned ON the VME rack, run the follow...
nicpc% cg3_init
** Launch DS9 to view the images. [#e5f0adb3]
nicpc% ds9 -options-as-you-like &
You can optimise the sizes and configuration of the three...
** Test exposure [#mc57fe99]
nicpc% TL 3 2
- After some seconds, three images corresponding to J-, H...
- The images may look somewhat unusual if you have just t...
** Open the cold shutter [#q7b18ecd]
- Open the shutter with the following command on nicpc.
nicpc% darkshutter.py --open
(turn the CLD on, and wait for 10 sec)
(test exposure begins automatically)
Type 'o', 'p', 'open', 'close', etc., following the prom...
- The power of the CLD is turned off automatically.
- (alternative way) You can also do the same thing manual...
++ Type the following commands to turn the CLD on, and op...
nicpc% ipmint.sh --on 3
(The status of IPPower is displayed. CLD's is connecte...
(Wait for 10sec)
nicpc% shutter open
++ If the counts are ~0, the shutter might be closed. If ...
nicpc% shutter -init
++ When you confirm that the shutter is open, turn the po...
nicpc% ipmint.sh --off 3
** Retract the polarisation plate [#o7a89404]
nicpc% pol out
** Target acquisition. [#fabec191]
- You can use the UCC (GUI), ''pinpoint'' command on obs3...
-- Coarse focusing should be done before running the ''pi...
obs3% tempfocus nic
-- Be sure to adjust the position angle on the sky before...
-- The new acquisition command 'pinpoint' has been implem...
obs3% pinpoint nic <object_list_name_on_UCC> '<OBJECT_NA...
- If you use the remote command from nicpc, prepare the l...
-- One object per line. The format should be "Object_name...
(ex.) NGC2770 2000.0 9 09 33.709 +33 07 24.71
-- Save the list to the file named, e.g., my_objlist, and...
nicpc% point2 my_objlist NGC2770
** Set the position angle of the FoV [#e486a9fd]
- If you are using the ''pinpoint'' command described abo...
- If you are using the UCC (GUI) for acquisition, set the...
- Input 0 to the PA to be set [指令位置角 in Japanese]=>[...
-- The rotator can move only from -270 deg to +270 deg. &...
-- If you slue the telescope largely, cancel the AZ/EL sy...
- [実位置角 (current PA)] [指令位置角(PA to be set)] on t...
- [実角度 (current PA)] [指令角度 (PA to be set)] in the ...
** Test exposure to examine the acquisition [#o5fb8679]
- You can usually ignore this section if you are using ''...
- Type the following command on nicpc. See below for deta...
nicpc% TL <mode> <exptime>
- <mode> means the read-out mode. For test exposure, the ...
(ex.) test exposure with mode 3 and 10sec exposure:
nicpc% TL 3 10
** Focusing [#fc6069d6]
All the commands will run on nicpc. Note that they do not...
- Estimate the coarse focus position with calfocus.sh com...
nicpc% calfocus.sh dome_temp(degC)
- Move the focus to the prior position using focus comman...
nicpc% focus focus_position
- Take the images with several focus positions, measure t...
nicpc% autofocus exp_time band(秒) focus_start focus_end...
- This procedure sometimes fails, due to the failure of m...
-- In such case you should adjust the focus manually with...
- Example: The case with temperature=12.3degC
++ Estimate the empirical focus position as a prior
nicpc% calfocus.sh 12.3
=> Estimated focus: -5.3887
++ Move the focus to the prior position. (You can also do...
nicpc% focus -5.39
++ Estimate the best position with autofocus command.
--- Click the star to be measured on DS9 window.
nicpc% autofocus 3 j -5.5 -5.4 5
--- In this case the focus is set to five positions betwe...
--- See [[this page (Japanese)>ソフトウェアの説明#autofoc...
** Adjust the pointing offset (if needed) [#acb67d7b]
- There are some gaps of the background counts between th...
- The orientation, scale are as follows:
-- If you set the PA to 0 deg, synchronising with AZ/EL, ...
-- If you want to move the star rightwards on the image, ...
-- If you want to move the star upwards on the image, set...
-- The FoV is 2.7arcmin * 2.7arcmin, and the pixel scale ...
- There are three ways to do this.
- Method 1: Use xyoffset2 command
++ After test exposure (e.g., TL command), type the follo...
nicpc% xyoffset2 (no arguments)
++ Click the 'current position of the star (start)' on DS...
++ The offset between the start and goal is calculated, a...
++ Confirm the offset by taking test exposure using, e.g....
- Method 2: Use the UCC
-- Input the offset values (alpha, delta) into the [オフ...
- Method 3: Use the handset (not very useful)
++ On UCC, click [ハンドセット]=>[有効]=>[実行]
++ Press the [ENABLE] button. [MODE] should be set to [al...
++ Adjust the pointing with [CONTROL BUTTON]
** Take and check the imaging data [#hbb8221d]
- Use Lo / DL command. If you just want to test and do no...
: ''Lo'' command | No dither, take the specified number o...
: ''DL'' command | With dithering, dither along the circl...
: ''TL'' command | Test exposire, without saving.
*** Lo command usage [#l1270390]
> This command does not do any dithering, so that the sam...
nicpc% Lo mode exptime(sec) [object_name [num]]
- object_name will be the OBJECT keyword value in the FIT...
- num specifies the number of exposures to be taken. num ...
- (Example) Take 10 frames of NGC2770 with 30sec exposure...
nicpc% Lo 3 30 NGC2770 10
-- This gives 10 frames each for J, H and K, 30 FITS file...
*** DL command usage [#kf7ccadb]
> This command is for dithering observations.
nicpc% DL mode exptime [object_name [dith_num [dith_radi...
- dith_num specifies the number of dithering points. 10 i...
- dith_radius specifies the dithering radius. 10 arcsec i...
- (Example) Take 10 NGC2770 frames with mode 3 and 30sec ...
nicpc% DL 3 30 NGC2770 10 10
-- Dithering pattern is 'one at centre, nine along the ci...
-- After finishing the dithering set, the telescope gets ...
-- If you want to use the pipeline script 'nicred.sh' and...
- An example of dithering patter is shown below. This exa...
#ref(./Dither_Pattern.jpg,50%);
*** Read-out mode [#t158a89c]
> The mode is common parameter for all the observing comm...
The mode should be one of 3/4/43/44/83/84, i.e., (blank/4...
(&color(red){In short, mode 83 takes longer time, but giv...
- Outline
mode 3: Same exposure time for all JHK bands
mode 4: Different exposure time for individual bands
mode 43: Same exposure time, averaging over 4 times of F...
mode 44: Different exposure time, averaging over 4 times
mode 83: Same exposure time, averaging over 8 times
mode 84: Different exposure time (NOT all the three can ...
- Limitations of the exposure time for each mode
-- The exposure time cannot be shorter than the read-out ...
mode 3, 4: 2 sec
mode 43, 44: 8 sec
mode 83, 84: 16 sec
-- If you specify the different exposure times, the diffe...
mode 4 : One exposure must be >2 sec longer than ...
mode 44: One exposure must be >8 sec longer than a...
mode 84: One exposure must be >16 sec longer than ...
-- For all modes, the exposure time ''cannot exceed 257 s...
-- The linearity of the detector is known to be degraded ...
--- [[Ishiguro et al. (2011)>http://www.nhao.jp/nhao/rese...
- Brief description for mode 3 & 4
-- Both modes performs CDS (Correlated Double Sampling).
> ''mode 3''
-- Take the J-, H- and K-band images simultaneously with ...
-- Exposure and readout are done with the following schem...
reset, x, read1, exposure, read2
reset: flash the detector signal to reset the...
x: readout the blank frame
The effective exposure is made between ''read1'' and ''re...
> ''mode 4''
-- Take the three bands specyfying the individual exposur...
nicpc% DL 4 60,40,20 NGC2770 5 (J=60, H=40, K=20sec, d...
-- Exposure and readout are done with, e.g., the followin...
reset, x, read1_jhk, exp1, read_k, exp2, read_h, exp3,...
The effective exposure is made between ''read1_jhk'' and ...
- Brief description for mode 43 & 44
--Both modes require that the exposure is longer than 8 s...
Mode 44 further requires that one exposure is longer than...
---mode 43: Same exposure time for all JHK bands, averagi...
---mode 44: Individually specified exposure times, with t...
> ''mode 43'' (and mode 44)
- Exposure and readout for mode 43 are done with the foll...
reset, x, r1, r2, r3, r4, exp, r5, r6, r7, r8
- The effective exposure is made between, e.g., the begi...
- Mode 44 does the same thing with exposure times individ...
- Brief description for mode 83 & 84
--mode 83: Same exposure time for JHK, Fowler Sampling, a...
--mode 84: Individually specified exposure times, with th...
Lo 84 120,90,60 NGC2770 4 ===> NG.
Lo 84 120,120,60 NGC2770 4 ===> OK.
-- Both modes require exposure time longer than 16 sec.
Mode 84 further requires that one exposure time is more t...
> ''mode 83'' (and mode 84)
- Exposure and readout for mode 83 are done with the foll...
reset, x, x, r1, r2, r3, ..., r8, exp, r9, r10, r11, ....
- The effective exposure is made between, e.g., the begin...
- Mode 84 does the same thing with exposure times individ...
** Take the separate sky frame (if needed) [#m3807d18]
- If the target field is crowded with many stars, the sky...
- If you want to use nicred.sh (the pipeline script), set...
(target field) nicpc% DL 83 30 XYZ 10 10
(sky field) nicpc% DL 83 30 XYZ_sky 10 10
** Take the flat frame [#t9a0072a]
- We recommend to use twilight flat.
- The linearity of the detectors is known to break when t...
- To cancel out the detectors' systematic patterns, prepa...
** Take the dark frame [#hd80e75a]
- We strongly recommend to set the telescope to EL=90deg ...
-- If you close the shutter at the elevation (EL) other t...
- Close the cold shutter
nicpc% darkshutter.py
-- This command turns on the power of the CLD, enabling t...
-- After waiting for 10 sec, the shutter moves to the 'cl...
-- TL command will automatically run, so that you can adj...
+++ The example below shows the dark frame with the prope...
#ref(./NIC_DARK_OK.png,70%);
+++ Below is another example with the wrong position of t...
In this case you should move the shutter slightly towards...
#ref(./NIC_DARK_NG.png,65%);
-- When the test images are displayed, input the followin...
p [step_number] : Move the shutter towards the 'pol' dir...
o [step_numner] : Move the shutter towards the 'open' di...
open : Move the shutter to 'open' position.
close : Move the shutter to 'close' position.
pol : Move the shutter to 'pol' position.
init : Initialise the shutter position (move to the orig...
q : Accept and quit.
-- The CLD power will be turned off when exiting the prom...
- (for reference) How to close the shutter manually
++ Close the shutter
nicpc% ipmint.sh --on 3
nicpc% shutter close
++ Run the TL command to test if the shutter is on the pr...
-- Take several frames by changing the exposure time. If ...
--- You may find (especially when you take longer exposur...
#ref(./NIC_DARK_OK.png,70%);
-- You may sometimes find rectangular pattern like that s...
#ref(./NIC_DARK_NG.png,65%);
-- If you find any unwanted lights in the test images, mo...
--- Launch the shutter GUI.
nicpc% shuttergui &
--- Slide the 'steps' bar on GUI window to adjust the ste...
--- Click "To open" or "To pol" button to move the shutte...
--- Run TL command to test if the unwanted lights are com...
--- After setting the shutter to the proper position, be ...
nicpc% ipmint.sh --off 3
- Take the dark frames:
-- If you use the pipeline script (nicred.sh), set the ob...
nicpc% Lo 3 20 DARK 15
-- The readout mode and the exposure time should be the s...
-- nicpc has a shell script named 'darkscript.sh' to gene...
//-- nicpc には、最後のシャッター open も含めて自動でダー...
nicpc% darkscript.sh
--- This reads the exposure times from the data taken at ...
--- Be sure to confirm that the shutter is properly close...
nicpc% /home/nicop/obs_script/DARK[YYMMDD].sh
(The name of the script is displayed after running darks...
--- The script generated here contains 'shutter open' com...
* Finish the observations [#aecd5dbc]
** Open the shutter, and retract the polarisation plate ...
nicpc% darkshutter.py -o
(check the test images, adjust with 'o', 'p', etc., if...
(check the test images, exit with 'q')
nicpc% pol out
- This process is not needed if you run the dark script d...
- However, for the case the shutter stacks at the wrong p...
** Log out from nicpc [#iac6057f]
- Close all the windows running on nicpc (ds9, xterm, kte...
nicpc% logout
Be sure to do this after the dark script is finished (i.e...
** Shut down the telescope [#n00ccfa3]
** Before going home... [#y3708c92]
See the [[check list>staff/なゆた観測終了時にチェックする...
* Data reduction [#f712a1b4]
- Basic procedures are summarised in the following pages.
-- [[Japanese version>NIC解析マニュアル]]
-- [[English version>Data_Reduction_Manual]]
*Other miscellaneous information [#q5f72461]
** Data storage [#mfa1b61a]
- All the data are stored into the directory /data/YYMMDD...
- The files are named according to the sequential number ...
(example) For the 35th H-band frame taken at 2019-09-13
directory: /data/190913/rawdata/
filename: h190913_0035.fits
- The directory of the date is automatically generated wh...
- The date is switched to the next day at 8:00 a.m. next ...
** How to stop the integration [#x4d44980]
- Suppose you started integration by typing the following...
nicpc% DL 84 60,60,30 NGC2770 10 10
but you want to stop this for some reasons.
- From other terminal window, type the following command:
nicpc% xstop
Then, if you are lucky enough, the integration (set of un...
-- Note that you cannot stop the on-going exposure with t...
- If you want to stop the integration immediately, try Ct...
-- The data of the current integration will be lost when ...
-- The frame ID number of the current integration will be...
-- We basically do not strongly recommend to do this.
//どうしても積分をすぐに止めたい場合は
// cogito3_reset
//としてみるとか?
*Revision history [#m9489cf5]
-20110730 T.Zenno: Created (nic_observe.txt)
-20120502 J.Takahashi: Added the procedures to start the...
-20120516 J.Takahashi: Re-formatted to wiki
-20120517 J.Takahashi: Revised according to the change o...
-20120628 J.Takahashi: Added 'Finish the observaions' se...
-20120704 J.Takahashi: Modified the log-in procedures
-20130316 J.Takahashi: Added the log-in procedures using...
-20180212 T.Saito: Fully revised and re-formatted by inc...
-20180312 J.Takahashi: Revised according to the recent u...
-20190518 T.Saito: Added automated shutter command inclu...
-20190913 T.Saito: Translated to English
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