Night Reports
Nightly observing summaries
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. 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.
The SkyCam columns link to zero-point (ZP) plots and movies constructed from optical images obtained with SkyCam-A (whole sky), SkyCam-T and SkyCam-Z. 'A', 'T' and 'Z' refer to the camera from which the data were acquired.