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Night Reports 2021

In the tables below, Observing, Weather and Technical refer to time spent observing, time lost to bad weather, and time lost because of technical problems. Note that Observing includes time spent on calibration observations and, occasionally, scheduled on-sky test observations; Technical does not include scheduled downtime (e.g. for planned engineering work).

The Night Duty Officer estimates whether the night was photometric or non-photometric (spectroscopic) based on satellite imagery and SkyCam data obtained through the night. This is a qualitative assessment only and may not always be entirely accurate. IT IS POSSIBLE THAT, ON OCCASION, OBSERVATIONS REQUIRING PHOTOMETRIC CONDITIONS ARE ACQUIRED IN NON-PHOTOMETRIC CONDITIONS. Users should check the quality of their data carefully. Good, average and poor seeing refers to inferred zenith seeing of < 1.0 arcsec, 1.0-2.0 arcsec, and > 2.0 arcsec, respectively. Calima refers to a warm wind that occasionally blows over from the Sahara and brings a lot of fine dust forcing a shutdown to protect the optics.

SKYCAM MOVIES AND ATMOSPHERIC TRANSMISSION

Below we also provide links to Movies constructed from a sequence of optical images obtained with either SkyCam-A (covering the whole sky), SkyCam-T (now showing a 9 degree field centred on each target; was 21 deg pre-21 Oct) or SkyCam-Z (1 degree field). Images are obtained every minute or so throughout the entire night. These movies can usually be used to establish, qualitatively at least, how clear or cloudy a given night was. On bright nights (i.e. when the moon is up), the smaller-field camera's T and Z are often more useful than the full-sky camera A. Additional movies and still images are available from the Skycam Archive. Plots of SkyCamZ Zero Point data are also provided. Zero points here are defined with respect to APASS 10 < r < 13 with no colour term. These indicate to first order periods of thin or thick cloud. A clear night usually results in a flat distribution of ZP values, while thick cloud causes a dip in the ZP level. 'A', 'T' and 'Z' in the SkyCam columns refer to the camera from which the data were acquired.

March 2021

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
1 Mar0.09.80.0Closed due to ice risk on Rams T A T -

February 2021

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
28 Feb0.09.80.0Closed due to ice risk. T A T -
27 Feb0.09.80.0Sub zero temperature and high humidity. T A T -
26 Feb5.64.30.0Good / average seeing in photometric conditions. T A T -
25 Feb9.50.10.3Poor to average seeing in spectrometric conditions. T A T -
24 Feb0.09.90.0Closed for night due to high humidity on site. T A T -
23 Feb100.00.0Good to average seeing in photometric conditions. T A T -
22 Feb100.00.0Average seeing in mixed conditions. T A T -
21 Feb0.010.00.0Closed for high humidity. - - - -
20 Feb0.010.00.0Closed for high humidity. - - - -
19 Feb100.00.0Non-photometric, average/poor seeing. Observations taken in manual at start of night to test new instrument. T A T -
18 Feb4.65.50.0Non-photometric, average/good seeing. Closed for cloud. T A T -
17 Feb10.10.00.0Photometric, average/poor seeing. Azm node reboot at start of night. T A T -
16 Feb9.60.00.5Non-photometric, average seeing. Node reboot due to science fold failure. Possible presence of calima during the night. T A T -
15 Feb10.10.00.0Photometric, average seeing. T A T -
14 Feb10.10.00.0Non-photometric; average-poor seeing. T A T -
13 Feb10.20.00.0Non-photometric; average seeing. T A T -
12 Feb10.20.00.0Non-photometric; good-average seeing. T A T -
11 Feb10.20.00.0Non-photometric; good-average seeing. T A T -
10 Feb0.010.20.0No observing; ice on external enclosure mechanisms. - - - -
9 Feb0.010.30.0No observing; ice on external enclosure mechanisms. - - - -
8 Feb0.010.30.0No observing; ice on external enclosure mechanisms. - - - -
7 Feb0.010.30.0No observing; closed due to ice risk. - - - -
6 Feb0.010.30.0Snow - - - -
5 Feb0.010.40.0Snow - - - -
4 Feb0.010.40.0Snow - - - -
3 Feb1.49.00.0Photometric, good seeing. Closed by humidity. T A T -
2 Feb10.40.00.0Photometric. Good seeing. T A T -
1 Feb9.70.70.0Non-photometric. Average seeing. Brief cloud closure. T A T -

January 2021

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
31 Jan10.50.00.0Photometric, average seeing. T A T -
30 Jan10.10.00.4Photometric, average seeing. AMN failure. T A T -
29 Jan10.50.00.0Photometric, good/average seeing. T A T -
28 Jan10.60.00.0Photometric, good/average seeing. Moptop configuration errors. T A T -
27 Jan10.60.00.0Photometric. IO:O offline. T A T -
26 Jan10.60.00.0Photometric. IO:O offline, Raptor engineering work first part of the night. T A T -
25 Jan10.60.00.0Non-photometric, average seeing. T A T -
24 Jan0.010.60.0No observing; ice risk. - - - -
23 Jan0.010.60.0No observing; ice risk. - - - -
22 Jan0.010.60.0No observing; ice risk. - - - -
21 Jan0.010.60.0No observing; ice risk. - - - -
20 Jan0.010.70.0No observing; ice risk. - - - -
19 Jan0.010.70.0No observing; ice risk. - - - -
18 Jan0.010.70.0No observing; ice risk. - - - -
17 Jan0.010.70.0No observing; Ice risk. - - - -
16 Jan0.010.70.0No observing; Ice risk. - - - -
15 Jan0.010.70.0No observing; Ice risk. - - - -
14 Jan0.010.70.0No observing; Ice risk. - - - -
13 Jan0.010.70.0No observing; Ice risk. - - - -
12 Jan0.010.70.0No observing; closed due to ice risk and high humidity. - - - -
11 Jan0.010.70.0No observing; closed due to ice risk and high humidity. - - - -
10 Jan0.010.80.0No observing; closed due to ice risk and high humidity. - - - -
9 Jan0.010.80.0No observing; closed due to ice risk and high humidity. - - - -
8 Jan0.010.80.0No observing; closed due to high humidity. - - - -
7 Jan0.010.80.0No observing; closed for high humidity and wind. - - - -
6 Jan0.010.80.0No observing; closed for high humidity. - - - -
5 Jan0.010.80.0No observing; closed for high humidity. - - - -
4 Jan0.010.80.0No observing; closed for high humidity. - - - -
3 Jan0.010.80.0No observing. Cloud, high humidity - - - -
2 Jan0.010.80.0No observing. Cloud. - - - -
1 Jan10.90.00.0Non-photometric. Seeing average. T A T -