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Night Reports 2018

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 (a 9 degree field centred on each target; was 21 deg before Oct 2014) 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.

February 2018

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
16 Feb0.010.10.0Ice on enclosure - - - -
15 Feb0.010.10.0Ice on enclosure - - - -
14 Feb0.010.10.0Ice on enclosure - - - -
13 Feb0.010.20.0Ice on enclosure - - - -
12 Feb0.010.20.0Ice on enclosure - - - -
11 Feb0.010.20.0Ice on enclosure - - - -
10 Feb0.010.20.0High humidity, ice on enclosure - - - -
9 Feb0.010.30.0High humidity, ice on enclosure - - - -
8 Feb0.010.30.0High humidity, ice on enclosure - - - -
7 Feb0.010.30.0High humidity, ice on enclosure - - - -
6 Feb0.010.30.0High humidity, ice on enclosure - - - -
5 Feb0.010.40.0High humidity, ice on enclosure - - - -
4 Feb0.010.40.0High humidity, ice on enclosure - - - -
3 Feb0.010.40.0High humidity, ice on enclosure - - - -
2 Feb0.010.40.0High humidity, ice on enclosure - - - -
1 Feb0.010.40.0High humidity, ice on enclosure - - - -

January 2018

DateHours UsedCommentSkyCam
ObservingWeatherTechnicalZP PlotMovie
31 Jan0.010.50.0High humidity, ice on enclosure - - - -
30 Jan0.010.50.0High humidity, ice on enclosure. - - - -
29 Jan0.010.50.0High humidity, ice on enclosure. - - - -
28 Jan0.010.60.0High humidity and sub-zero temperature. - - - -
27 Jan9.61.00.0Photometric until early morning, average seeing. Z A T Z
26 Jan10.60.00.0Photometric, average/poor seeing. Z A T Z
25 Jan10.60.00.0Photometric, average seeing. Z A T Z
24 Jan8.62.00.0Non-photometric, seeing improved over night from poor to good. Lost 2 hours to clouds early in the night. Z A T Z
23 Jan7.63.00.0Non-photometric, average seeing. Lost 3 hours to clouds early in the night. Z A T Z
22 Jan10.60.00.0Photometric and good seeing for most of the night, thin clouds and average seeing near morning twilight. Z A T Z
21 Jan10.60.00.0Photometric and average/poor seeing. Z A T Z
20 Jan10.70.00.0Photometric, average/poor seeing. Z A T Z
19 Jan10.70.00.0Photometric, average seeing. Z A T Z
18 Jan8.90.01.8Photometric, average seeing. Cassegrain axis torque errors in middle of night. Z A T Z
17 Jan0.010.70.0Closed due to ice on enclosure and high humidity. Z A T Z
16 Jan0.010.70.0Closed all night due to high humidity and ice. Z A T Z
15 Jan0.710.00.0Closed most of the night for high humidity, high wind speed and ice risk. Poor seeing. Z A T Z
14 Jan6.04.80.0Photometric, average/poor seeing. High humidity. Z A T Z
13 Jan3.07.80.0Non-photometric, average seeing. High humidity. Z A T Z
12 Jan10.70.00.0Non-photometric, good/average seeing. Z A T Z
11 Jan7.30.03.5Photoemtric, average seeing. Cass bearing fault. Z A T Z
10 Jan10.80.00.0Photometric, average seeing. Z A T Z
9 Jan10.80.00.0Non-photometric, average seeing. Z A T Z
8 Jan0.010.80.0Ice on the enclosure. - - - -
7 Jan0.010.80.0Ice and humidity - - - -
6 Jan0.010.80.0High humidity & rain - - - -
5 Jan6.54.30.0Poor seeing. Intermittent humidity. Z A T Z
4 Jan9.40.01.4Photometric. Average/poor seeing. Cass bearing fault. Z A T Z
3 Jan10.80.00.0Photometric. Poor seeing. Z A T Z
2 Jan10.80.00.0Photometric. Poor seeing. Z A T Z
1 Jan0.00.010.9Photometric. Poor seeing. Some obs in twilight, then E-stop fault. Z A T Z