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How bright is C2017 T2 PanSTARRS?

Image

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About this observation
Observer
Dean Ashton
Time of observation
03/01/2020 - 18:17
Object
C2017 T2 PanSTARRS
Observing location
St Austell, Cornwall UK
Equipment
Celestron 235mm EdgeHd f/7
CGEM
Celestron Nightscape 10100 OSC CCD
Exposure
1x300-seconds /f7
Tags

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.

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