Observation by David Swan: A few measurements of C/2017 T2

Uploaded by

David Swan

Observer

David Swan

Observed

2019 Dec 01 - 18:04

Uploaded

2019 Dec 02 - 11:58

Objects

C/2017 T2 (PANSTARRS)

Equipment

200mm SCT
Hyperstar
ASI178MM
Baader UV+IR cut
Maxim DL and Astrometrica

Exposure

52 x 20s

Location

Tynemouth, UK

Target name

C/2017 T2

Title

A few measurements of C/2017 T2

Files associated with this observation

Untitled-1_0.jpg (537.5 kB)

Like this image

Neil Morrison, Derek Robson, Nick James, Andy Wilson, Jeremy Shears, Mr Michael Alan Frost, Graham Winstanley, Dean Ashton OBE, Peter Mulligan, Peter Carson, Honor Wheeler, Andrew Dumbleton

Comments

David Swan, 2019 Dec 02 - 13:17 UTC

My magnitude determination uses the Astrometrica R zeropoint and manual drawing of a region to capture total flux: it takes into account some extra flux not captured by Comphot's circular aperture. With a specified radius of 60 arcsec, Comphot goes for a radius of 62 arcsec and mag = 10.79.

Nick James, 2019 Dec 03 - 07:32 UTC

What was the area you used for the manual magnitude estimate? The convention is that this should be the coma and not the tail although sometimes it is difficult to distinguish the two!

David Swan, 2019 Dec 03 - 19:36 UTC

It'll come out dimmer then. I didn't put 'my' figure on COBS, knowing it may not have been kosher. The Comphot one looks sensible.

* Update. 2019/12/03 morning: Brightness estimate on image reflects flux attributable to coma only.

* Further update. 2019/12/03 evening: new set of images analysed with Comphot - which found coma of diameter 3.4 arcmin and mag 10.4.

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