Comet Pons-Brooks on Dec 9, 2023


Date & Time: Dec 9 2023, from 17:48 to 18:07 JST(+0900)
Composed 6 shots with 2 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, comet Pons-Brooks was positioned in the western evening sky, approximately 1.2 degrees southeast of Vega in the constellation Lyra. The faint, spherical coma had an apparent diameter of about 5 arc minutes, and its overall brightness ranged from 8th to 9th magnitude. Unfortunately, due to conditions with thin clouds, ion components, as observed in images taken last month, could not be confirmed. Towards the northeast, there appears to be an extremely short tail-like structure.
View angle: 0.70×0.70°


Pons-Brooks on Dec 17, 2023
Pons-Brooks on Nov 18-19, 2023

Copyright(c) 2023 by Naoyuki Kurita, All rights reserved.
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