Observation by Dean Ashton: How bright is C2017 T2 PanSTARRS?

Uploaded by

Dean Ashton

Observer

Dean Ashton

Observed

2020 Jan 03 - 18:17

Uploaded

2020 Jan 11 - 18:38

Objects

C/2017 T2 (PANSTARRS)

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Constellation

Perseus

Field centre

RA: 03^h17^m
Dec: +55°32'
Position angle: -3°30'

Field size

0°37' × 0°27'

Equipment

Celestron 235mm EdgeHd f/7
CGEM
Celestron Nightscape 10100 OSC CCD

Exposure

1x300-seconds /f7

Location

St Austell, Cornwall UK

Target name

C2017 T2 PanSTARRS

Title

How bright is C2017 T2 PanSTARRS?

About this image

This is a single 300-second exposure of C2017 T2 PanSTARRS taken on 3rd January at 18:17UT. The original linear RAW FITS image was calibrated and a background extraction performed to remove the light gradient, but otherwise not processed. MaximDL photometry was used on the image using the reference stars labelled to estimate the magnitude of the comet nucleus.

Magnitude of C2017 T2 PanSTARRS nucleus estimated with MaximDL photometry was +12.2.

Estimates using other 180-second and 120-second images from the same night also gave estimates of magnitude of around +12.2

This is significantly dimmer than quoted magnitudes of +9.5 for the same night.

The image shown has subsequently had the exposure increased for presentation, but in a linear manner to retain the relative brightness of stars and comet.

Files associated with this observation

C-2017 T2 PanSTARRS_2020-01-03_181648_Celestron Nightscape_300sec_1x1_-10C_c_cc.jpg (1.9 MB)

Like this image

David Swan, John Bracegirdle, Andy Wilson, Jeremy Shears, Andrew Dumbleton

Comments

David Swan, 2020 Jan 11 - 18:59 UTC

That seems to be in agreement with others when looking at nuclear mag with CCD. Denis B's last image had 12.2 (R zeropoint) written as the nuclear mag. Visual and visual equivalent magnitudes are for the whole coma.

http://www.britastro.org/cometobs/2017t2/2017t2_20191231_2003_dgb.html

Dean Ashton, 2020 Jan 11 - 21:08 UTC

Thank you for the reply David

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