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| || 20180117s92 || Mars || 7:56 a.m. || 35 deg || z0 - 0.2 || || || || |
Back to the NIKA2 2nd Science pool
This page gather the information on the technical observations that are needed to perform NIKA2 calibration.
Pointing
A full pointing session was executed on the first night, from scans 20180116s116 to 20180116s156, interrupted to do a gain-elevation measurement on 3C84, and resumed from scans 20180116s168 to 20180117s19., with 34 measurements in total. Overall, the pointing at 2mm where of good quality. During that night, the beam was very stable with FWHM values at 1mm of 11.3” and 17.6” @ 2mm, the focus did not change much. Data has been sent to Juan Penalver and Albrecht Sievers
Beammaps
Beammap sequences, which are focus + pointing + beammap, are to be done at least once a day, spanning various elevation, at the best average focus (z central - 0.2 mm).
Beammap analysis status
The table below gathers the beammap scan ID, comments related either to the observing condition or to the reduced beammap quality and the analysis status
Status "done" means the analysis is completed, namely the kidpar file is produced using a 2-step iteration analysis, and uploaded in SVN.
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observing condition |
analysis status |
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scan ID |
source |
UT |
elevation |
comments |
analyser ID |
data quality |
status |
20180115s108 |
Uranus |
2:10 p.m. |
35 deg |
closest focus scan 15s106 |
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20180115s109 |
Uranus |
2:35 p.m. |
39 deg |
scan in elevation (constant azymuth) |
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20180115s122 |
Uranus |
4:00 p.m. |
54 deg |
closest focus scan 15s120 |
LP |
v0 done |
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20180115s123 |
Uranus |
4:25 p.m. |
57 deg |
z0 - 0.1 |
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20180115s124 |
Uranus |
4:50 p.m. |
60 deg |
z0 - 0.3 |
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20180115s125 |
Uranus |
5:15 p.m. |
61 deg |
z0 - 0.4 |
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20180116s68 |
Uranus |
5:04 p.m. |
61 deg |
z0 - 0.2 |
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20180117s92 |
Mars |
7:56 a.m. |
35 deg |
z0 - 0.2 |
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Special beammap sequences
- For the optimization of the best average focus, a few series of beammaps at different axial focus in a row are needed: the focus settings to be spanned are z0 - 0.2mm, z0 - 0.3mm and z0 - 0.4mm.
- For the study of the elevation impact and the test of destriping methods, couples of beammap with orthogonal scanning startegy will be made (using @beammap99.. a (default) and e (along the elevation)).
Opacity
A skydip scan per 8-hour observation shift, in all possible weather conditions, is needed
Table of the Skydip scans
Dates |
scan # |
tau225 |
comment |
20180116 |
69 |
0.3 |
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Calibrators
- Monitor primary and secondary calibrators. Few of them but repeatedly along the run and at various elevation
- Observe in priority MWC349: use the loop script comprizing 4 OTF scans, 3 times a day
Observe also Uranus, Mars & Neptune + NGC7027 (and optionally CRL2688)
Below the visibility plot:
Table of secondary calibrator scans
Dates |
scan # |
source |
elevation |
comment |
20180116 |
82-85 |
MWC349 |
29-26 |
otf 8x5 |
20180116 |
102-105 |
Uranus |
45-44 |
otf 8x5 |
Gain-elevation monitoring
Observe at least two complete spans of the elevation from about 20 to 80 degrees using 3C84
Table for gain curve task (3C84, i.e. 0316+413 in nikaw-17)
Dates |
scan # |
UT |
elevation |
comment |
20180116 |
111-114 |
20:55-21:15 |
76-73 deg |
otf 8x5 |
20180116 |
163-167 |
23:30-23:40 |
48-46 deg |
otf 8x5 |
20180117 |
35-38 |
2:30-2:45 |
17-14 deg |
otf 8x5, OUT OF FOCUS |
20180117 |
39-42 |
2:45-3:00 |
14- deg |
otf 8x5, focus set by hand without having used @focusOTF-Z, but we checked the focus was stable (no sizeable change) afterwards |