Observation by Nick James: Sky conditions in Chelmsford

Uploaded by

Nick James

Observer

Nick James

Observed

2020 May 28 - 23:00

Uploaded

2020 May 29 - 19:45

Objects

The Earth

Equipment

C11 Edge HD + FLI6303

Exposure

223x60s

Location

Chelmsford, UK

Target name

Sky brightness

Title

Sky conditions in Chelmsford

About this image

Last night was particularly clear in Chelmsford and I did a long run with the telescope pointed at a single object (20th mag comet C/2020 K2). This is a plot of the sky background level from my images computed using Gaia DR2 as a refrence for the magnitude zero point. The field was in Lyra and so was rising through the night and was near the zenith at dawn. You can see the effect of my local streetlights going off at 1am BST (00:00 UTC). The Moon set at 00:54 and the darkest sky conditions were just before dawn when I reached 19.1 mag/arcsec^2 at around 01:00. Brightening due to the dawn was detectable around 01:10 UTC when the Sun was around 14.5 deg below the horizon. Nautical twilight for here last night started at 01:56 UTC.

Files associated with this observation

sky_background2.jpg (203.3 kB)

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Chris Dole, Bill Leatherbarrow, David Basey, Andy Wilson, Peter Carson

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