I have it this evening at magnitude10.8/9 compared to 11.15 yesterday.

Peter T

OBSERVER:    Peter Tickner
OBS CODE:    XXX
TELESCOPE:   0.35m f/10.0 356mm LX200ACF
EXPOSURE JD: Mid-exposure, not corrected for light time
---------------------------------------------------------------
      JD         mag     Flt   SNR    ZeroPt      Cat   Design.
---------------------------------------------------------------
2460360.27745   10.877 G  C  296.88   26.915    Gaia2   12P/Pons-Brooks
2460360.27780   10.857 G  C  448.07   26.891    Gaia2   12P/Pons-Brooks
2460360.27815   10.867 G  C  427.59   26.879    Gaia2   12P/Pons-Brooks
2460360.27850   10.856 G  C  252.97   26.822    Gaia2   12P/Pons-Brooks
2460360.27885   10.890 G  C  433.28   26.866    Gaia2   12P/Pons-Brooks
2460360.27920   10.913 G  C  228.49   26.866    Gaia2   12P/Pons-Brooks
2460360.27955   10.869 G  C  198.23   26.825    Gaia2   12P/Pons-Brooks
2460360.27990   10.873 G  C  420.58   26.878    Gaia2   12P/Pons-Brooks
2460360.28024   10.888 G  C  218.69   26.871    Gaia2   12P/Pons-Brooks
2460360.28059   10.770 G  C  268.10   26.730    Gaia2   12P/Pons-Brooks
----- end -----

-----Original Message-----
From: baa-comet@simplelists.com [mailto:baa-comet@simplelists.com] On Behalf Of Nick James
Sent: 19 February 2024 21:25
To: baa-comet@simplelists.com
Subject: [BAA Comets] 12P/Pons-Brooks update

This comet continues to brighten. The magnitude in a 9 arcsec radius is now brighter than 11. We haven't seen any significant outbursts for a month.

The comet's total magnitude is now around 7.3 measured using comphot and it is showing a nice, active ion tail to the north. It will brighten quite rapidly now as it moves in towards perihelion. By the time the Moon moves out of the evening sky in a week or so the comet may be a naked-eye object from dark sites and it should reach 4th magnitude in April.

A review of the behaviour up to the end of 2023 appeared in the February JBAA (Vol. 134, No. 1). Members can download this from here:

https://britastro.org/journal/baa-journal-volume-134-number-01-february-2024

Nick.
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