Observation by Nick James: Total magnitude of C/2017 T2 (PanSTARRS)

Uploaded by

Nick James

Observer

Nick James

Observed

2020 Jan 20 - 19:00

Uploaded

2020 Jan 23 - 07:58

Objects

C/2017 T2 (PANSTARRS)

Equipment

C11 + WO 90mm refr.

Exposure

20x60s, 60x60s

Location

Chelmsford, UK

Target name

C/2017 T2

Title

Total magnitude of C/2017 T2 (PanSTARRS)

About this image

This is a comparison of the total magnitude of C/2017 T2 obtained comphot with a slow (0.28m,f/10) and fast (0.09m, f/5) optical system. The total magnitude of a comet is critically dependent on how much of the faint outer coma is detected. To a lesser extent it is dependent on the colour response of the sensor. In this example of images taken at the same time the fast system gives a result which is 1 magnitude brighter than the slow system. The current COBS lightcurve gives a scatter of almost 2 mags in electronic estimates of the comet. Visual observers in dark skies are seeing around mag 9. The mean of the electronic observations is around mag 10.

Files associated with this observation

2017t2_20200120_ndj.jpg (1.0 MB)

Like this image

David Basey, Dr Paul Leyland, Dean Ashton OBE, Jeremy Shears, Andy Wilson, Mark Phillips, Peter Carson, Andrew Dumbleton

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