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Night Reports 2017

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 fine dust that occasionally blows over from the Sahara.

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.

April 2017

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
29 Apr0.08.00.0Humidity - -
28 Apr0.08.00.0Humidity - -
27 Apr0.08.00.0Humidity - -
26 Apr0.08.00.0Humidity - -
25 Apr0.08.10.0Humidity - -
24 Apr8.10.00.0Non-photometric, good seeing. Z A T Z
23 Apr8.10.00.0Non-photometric, good seeing. Z A T Z
22 Apr8.10.00.0Non-photometric, good seeing. Z A T Z
21 Apr6.31.80.0Non-photometric, cloud in morning, good seeing. Z A T Z
20 Apr8.20.00.0Photometric, good seeing. Z A T Z
19 Apr8.20.00.0Photometric, average/good seeing. Z A T Z
18 Apr6.00.02.2Non-photometric, average seeing. Altitude node fault at beginning of night. Z A T Z
17 Apr8.30.00.0Photometric, average seeing. Z A T Z
16 Apr8.40.00.0Non-photometric, average seeing. Z A T Z
15 Apr3.05.40.0Non-photometric, average seeing. Closed for cloud. Z A T Z
14 Apr3.55.00.0Non-photometric, average/good seeing. Closed for cloud. Z A T Z
13 Apr8.50.00.0Non-photometric, average/poor seeing. Z A T Z
12 Apr8.60.00.0Non-photometric, average seeing. Z A T Z
11 Apr3.65.00.0Non-photometric, high humidity and cloudy. Poor/average seeing. Z A T Z
10 Apr0.68.00.0High humidity. Z A T Z
9 Apr4.64.00.0Non-photometric and cloudy, high humidity. Poor/average seeing. Z A T Z
8 Apr8.60.00.0Photometric, average seeing. Z A T Z
7 Apr8.70.00.0Photometric, good/average seeing. Z A T Z
6 Apr8.70.00.0Photometric, good/average seeing. Z A T Z
5 Apr7.81.00.0Non-photometric, average seeing. Heavy cloud at start of night. Z A T Z
4 Apr8.80.00.0Non-photometric, average seeing. Z A T Z
3 Apr8.80.00.0Photometric, average seeing. Z A T Z
2 Apr8.80.00.0Non-photometric. Good/average seeing. Z A T Z
1 Apr8.80.00.0Non-photometric. Good/average seeing. Z A T Z

March 2017

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
31 Mar8.90.00.0Non-photometric. Good seeing at the start of the night, becoming average later on. Z A T Z
30 Mar8.90.00.0Non-photometric. Good/average seeing. Z A T Z
29 Mar90.00.0Non-photometric. Some good seeing at the start of the night, then average seeing. Z A T Z
28 Mar90.00.0Set photometric but some cloud around 4am. Good/average seeing. Z A T Z
27 Mar9.10.00.0Photometric. Average seeing. Z A T Z
26 Mar4.64.50.0Non-photometric. Good seeing. Z A T Z
25 Mar9.10.00.0Photometric. Good seeing. Z A T Z
24 Mar4.05.20.0Photometric. Good seeing. High humidity. Z A T Z
23 Mar9.20.00.0Photometric. Average seeing. Z A T Z
22 Mar6.20.03.0Non-photometric. Average seeing. RCS JVM fault. Z A T Z
21 Mar9.29.20.0Non-photometric. Average seeing. Z A T Z
20 Mar0.09.30.0High humidity, ice. Z A T Z
19 Mar0.09.30.0High humidity, ice. Z A T Z
18 Mar0.09.30.0High humidity, ice. Z A T Z
17 Mar0.09.40.0High humidity, ice. Z A T Z
16 Mar0.09.40.0High humidity, ice, snow. Z A T Z
15 Mar1.18.30.0High humidity and freezing temperatures. Z A T Z
14 Mar9.40.00.0Photometric with average seeing. Z A T Z
13 Mar9.40.00.0Photometric with poor/average seeing. Z A T Z
12 Mar9.50.00.0Non-photometric, poor seeing. Z A T Z
11 Mar9.50.00.0Non-photometric, poor seeing. Z A T Z
10 Mar9.50.00.0Non-photometric. Poor seeing. Full Moon. Z A T Z
9 Mar9.60.00.0Non-photometric, average-to-poor seeing. Z A T Z
8 Mar9.60.00.0Photometric, poor-to-average seeing. Z A T Z
7 Mar9.60.00.0Photometric, poor-to-average seeing. Z A T Z
6 Mar0.00.09.7Scheduled maintenance; no observing. - - - -
5 Mar7.12.60.0Non-photometric, some cloud, windy. Z A T Z
4 Mar9.70.00.0Photometric. Average seeing. Z A T Z
3 Mar9.80.00.0Photometric. Average seeing. Z A T Z
2 Mar6.53.30.0Completely clear of cloud but wildly variable (0.6 – 5 arcsec) seeing Z A T Z
1 Mar9.80.00.0Photometric. Average seeing. Z A T Z

February 2017

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
28 Feb9.80.00.0Non-photometric. Good seeing. Z A T Z
27 Feb9.80.00.0Became non-photometric after 05:00UTC. Good seeing. Z A T Z
26 Feb9.90.00.0Photometric, good/average seeing. Z A T Z
25 Feb9.90.00.0Photometric, average/poor seeing. Z A T Z
24 Feb5.14.80.0Non-photometric, good/average seeing. Calima at start of night. Z A T Z
23 Feb6.83.20.0Photometric, average seeing. High humidity at start of night. Z A T Z
22 Feb8.02.00.0Photometric, good seeing. Some high humidity in evening. Z A T Z
21 Feb0.010.00.0No observing due to ice on enclosure mechanism. - - - -
20 Feb0.010.00.0No observing due to ice on enclosure mechanism. - - - -
19 Feb4.55.50.0Photometric, average seeing. High humidity. Z A T Z
18 Feb10.10.00.0Photometric, average seeing. Z A T Z
17 Feb10.10.00.0Photometric, average seeing. Z A T Z
16 Feb10.10.00.0Set non-photometric but was actually clear, average/poor seeing. Z A T Z
15 Feb0.010.10.0Risk of ice on enclosure. Z A T Z
14 Feb0.010.10.0Closed all night due to high humidity and low temperature. Z A T Z
13 Feb0.010.20.0Closed all night due to high humidity and low temperature. Z A T Z
12 Feb0.010.20.0Closed all night due to high humidity and low temperature. Z A T Z
11 Feb0.010.20.0Closed all night due to high humidity and ice risk. Z A T Z
10 Feb0.010.20.0Closed all night due to high humidity and ice risk. Z A T Z
9 Feb0.310.00.0Non-photometric. High humidity all night. Z A T Z
8 Feb10.30.00.0Photometric with average seeing. Z A T Z
7 Feb10.30.00.0Photometric with average seeing. Z A T Z
6 Feb10.30.00.0Non-photometric with average/good seeing. Z A T Z
5 Feb10.40.00.0Non-photometric with poor/average seeing. Z A T Z
4 Feb10.40.00.0Photometric with average/good seeing. Z A T Z
3 Feb10.40.00.0Photometric with average seeing. Z A T Z
2 Feb8.91.50.0Photometric, average seeing. Brief closure for high humidity. Z A T Z
1 Feb2.08.40.0Non-photometric with average/poor seeing. Most of night lost to high humidity. Z A T Z

January 2017

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
31 Jan6.54.00.0Non-photometric, average seeing. High humidity from 3.30UT Z A T Z
30 Jan4.56.00.0Non-photometric, average seeing. Z A T Z
29 Jan10.50.00.0Photometric. Good seeing Z A T Z
28 Jan10.60.00.0Photometric. Good seeing. Z A T Z
27 Jan10.60.00.0Photometric. Good seeing. Z A T Z
26 Jan10.60.00.0Photometric after first hour of the night. Average seeing Z A T Z
25 Jan7.03.60.0Non-photometric. Good seeing. Cloud at start and humidity at end of night. Z A T Z
24 Jan10.10.50.0Non-photometric. Good seeing. Brief cloud closure. Z A T Z
23 Jan10.60.00.0Photometric. Average/poor seeing degrading through the night. Z A T Z
22 Jan4.75.90.0Photometric, average seeing, high humidity plus ice risk. Z A T Z
21 Jan10.60.00.0High humidity & ice risk. Z A T Z
20 Jan10.70.00.0High humidity & ice risk. Z A T Z
19 Jan8.02.40.3Photometric, average seeing. Autoguider focus problems at start of night. High humidity set in a few hours before sunrise. Z A T Z
18 Jan10.70.00.0Photometric, good seeing. Z A T Z
17 Jan10.70.00.0Photometric, good seeing. Z A T Z
16 Jan10.70.00.0Photometric, good seeing. Z A T Z
15 Jan10.70.00.0Non-photometric. Average seeing. Z A T Z
14 Jan3.57.20.0Non-photometric. Intermittent cloud. Z A T Z
13 Jan6.93.80.0Cloud. Second half of night usable with poor seeing. Z A T Z
12 Jan1.09.70.0Cloud all night. Few observations in twilight. Z A T Z
11 Jan0.010.70.0Cloud all night. Z A T Z
10 Jan10.80.00.0Non-photometric. Substantial cloud in middle of night. Poor seeing. Z A T Z
9 Jan10.80.00.0Photometric. Good seeing. Z A T Z
8 Jan10.80.00.0Non-photometric, average/poor seeing. Frodospec failure. Z A T Z
7 Jan0.010.80.0Thick high cloud, no observing. - - - -
6 Jan1.98.90.0Non-photometric. High humidity, and thick cloud when we did open. Z A T Z
5 Jan10.40.00.4Non-photometric. Poor/average seeing. Secondary fold rotation failure. Augtoguider focus problems. Z A T Z
4 Jan10.80.00.0Non-photometric. Poor/average seeing. Z A T Z
3 Jan10.80.00.0Set non-photometric but was cloudless. Average/poor seeing. Z A T Z
2 Jan2.97.90.0Set non-photometric. Poor seeing. High humidity. Z A T Z
1 Jan10.90.00.0Set photometric but cirrus after 01:00UTC. Poor seeing. Z A T Z