Comet Pons-Brooks on Dec 17, 2023


Date & Time: Dec 17 2023, from 18:10 to 18:38 JST(+0900)
Composed 5 shots with 4 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
with IDAS LPS-P1 Light-pollution suppression filter
Auto-guided with Meade LX200 Equatorial & Lacerta M-GEN
Digital Camera: Nikon D810A
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(4080×4080)
Device Size...20×20mm
Sensitivity...ISO4000, White Balance...Daylight


On this day, the comet Pons-Brooks was situated in the western evening sky, approximately 4.5 degrees east of Vega in the constellation Lyra. In just one week since the last observation on Dec 9, it seems to have undergone another outburst, displaying significant changes in its appearance. A greenish ionized composition with an apparent diameter of about 5 arc minutes has developed, and within it, a small and white coma is discernible. The total magnitude of the coma is approximately 8th magnitude. Additionally, there is observable evidence of a tail beginning to extend in the NNE direction.
View angle: 0.70×0.70°


Pons-Brooks on Jan 5, 2024
Pons-Brooks on Dec 9, 2023

Copyright(c) 2023 by Naoyuki Kurita, All rights reserved.
To top page To Comets&Meteors index