Back to the NIKA2 3rd Science pool

This page gathers the information on the technical observations that are needed to perform NIKA2 calibration.

First version created on Feb. 7th by Hervé Aussel, F.-Xavier Désert, Jean-François Lestrade, Juan Maciàs-Pèrez, Frédéric Mayet, Laurence Perotto & Nicolas Ponthieu.

Contents

  1. Pointing
  2. Beammaps
  3. Opacity
  4. Calibrators
  5. Gain-elevation monitoring

Pointing

A full pointing session (20 to 30 sources) to be done on the first night. Let's use Samuel's excell file to check the coverage in elevation and azymuth.

Beammaps

Beammap sequences, which are focus + pointing + beammap, are to be done at least once and preferably twice a day, spanning various elevation, at the best average focus (z central - 0.2 mm).

The best quality beammap should be achieved toward Mars when rising; You may consider also doing beammaps during the night toward 3C84 (as an alternative to planets, as none of them are visible at night for this campaign).

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.

observing condition

analysis status

scan ID

source

UT

elevation

comments

analyser ID

data quality

status

20180213s139

Uranus

17:06

57.2 deg

opacity 0.24; pointing and focus was performed well before the beammap

JFMP

A1 #kids = 957. A3 #kids = 965. A2 #kids = 540.

done v0

20180214s63

Mars

06:09

30.4 deg

opacity 0.32

JFMP

A1 #kids = 953. A3 #kids = 940. A2 #kids = 527. A1 med fwhm = 12.5, avg fwhm = 12.6, rms = 1.6, G fit = 8.7 pm 1.2 A3 med fwhm = 12.5, avg fwhm = 12.6, rms = 1.7, G fit = 8.6 pm 1.2 A2 med fwhm = 17.7, avg fwhm = 17.7, rms = 1.2, G fit = 20.0 pm 0.5

done v0

20180216s262

Uranus

16:28:32

60.052254

tau: 0.197485

JFMP

A1 #kids = 974. A3 #kids = 956. A2 #kids = 538. A1 med fwhm = 12.4, avg fwhm = 12.4, rms = 1.4, G fit = 12.1 pm 1.2; A3 med fwhm = 12.2, avg fwhm = 12.2, rms = 1.4, G fit = 11.9 pm 1.2; A2 med fwhm = 17.2, avg fwhm = 17.2, rms = 1.0, G fit = 17.1 pm 1.3

done v0

Special beammap sequences

No special beammap tests are planned for this campaign as the Planet visibility is not favorable for testing subtle effects.

Opacity

A skydip scan per 8-hour observation shift, in all possible weather conditions, is needed

Table of the Skydip scans

Dates

scan #

tau225

UT

comment

2018-02-13

138

0.265982

16:55:35

2018-02-14

50

0.324578

05:01:54

2018-02-14

213

0.462108

18:20:39

2018-02-14

237

0.462108

19:47:03

2018-02-14

244

0.536094

20:40:32

2018-02-15

46

0.516668

03:52:17

tau > 0.5 and several spikes at ~ 1. We stop for the time being.

2018-02-15

52

0.523285

04:41:17

2018-02-15

111

0.409577

08:56:17

2018-02-15

301

0.595278

18:07:01

2018-02-15

319

0.467017

19:22:47

2018-02-16

127

0.400884

08:34:25

Calibrators

Below the visibility plot for Uranus, Mars, Neptune, 3C84, MWC349, LKHa101 and 2251+158 [TBD, Juan]

Science Visibility plot

Table of OTF 8x5 scans of Uranus

Dates

scan #

elevation

comment

20180116

102-105

45-44

otf 8x5

Table of OTF 8x5 scans of other Planets (Mars and Neptune)

Dates

scan #

source

elevation

comment

20180116

82-85

MWC349

29-26

otf 8x5

Table of OTF 8x5 scans of secondary calibrators (MWC349 and LKHa101)

Dates

scan #

source

elevation

comment

20180116

82-85

MWC349

29-26

otf 8x5

Gain-elevation monitoring

Observe at least two complete spans of the elevation from about 20 to 80 degrees using 3C84, if possible, or 2251+158

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

Table for gain curve task (2251+158 in nikaw-17)

Dates

scan #

UT

elevation

comment

20180119

108-111

10:10

20 deg

otf 8x5