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Observing Statistics

Observing Statistics

Here we give monthly summaries of time usages and losses, with a focus on the period after the Wide Field Upgrade was completed. In the run-up to full science operations, all aspects of science operations became more efficient and productive. In order to produce the most representative statistics, this reporting focuses on the period after 1 April 2017, although some earlier statistics are also included.

Monthly average time use statistics based on night reports
(fractions of time spent on science/engineering/weather/alignment/problems)

Sky quality averages
(seeing, transparency, etc)

Target acquisition statistics
(setup times, etc)


Summary of multi-year guider photometry data
 
used to generate the multipliers Object Observability calculator:

       data collected from 2019-01-01 through 2023-11-26

Image Quality:
   using 1-minute averages of all data >0.5" (N=557,901 measurements)

threshold
percentile
<3.00"
98.4%
<2.50"
94.8%
<2.25"
90.3%
<2.00"
81.8%
<1.75"
66.2%
<1.50"
40.5%
<1.25"
11.1%
<1.00"
0.4%


Transparency:
   using 1-minute averages of all data >0% and <110%  (N=541,136 measurements)

threshold
percentile
observed*
percentile
P (>90%)
26.1%
17.7%
S (>50%)
90.3%
61.4%
N (>20%)
97.6%
66.4%

*overall we have 43% time lost to bad weather; we estimate that ~25% of that
lost time was spent still collecting guider images. Thus, percentiles observed are
multiplied by 0.68 to get the percentile multipliers for each threshold.
(without this correction, the multiplier on N time would be 98%, which
would be highly unrealistic for planning purposes)





Last updated: Wed, 17 Jan 2024 16:59:57 +0000 stevenj



Observing Status

Night Reports and Schedules

Observing Statistics

Time use statistics

Monthly observing statistics

Target acquisition statistics

Sky quality statistics

verification of probe metrology data

Weather Closure Policy

Weather links

Priority List Algorithm

Observing Support - Night Staff