Comet Tsuchinshan 1 on Jan 12, 2024


Date & Time: Jan 12 2024, from 24:52 to 25:29 JST(+0900)
Composed 10 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 Tsuchinshan 1 is positioned at the northwest edge of Virgo, approximately 4.5 degrees southeast of Denebola in Leo, with an observed coma brightness of 8th magnitude. Despite being slightly fainter than forecasted, it is currently approaching its maximum brightness. The apparent diameter of the coma is around 10 arc minutes, and a short tail is visible extending in WNW direction.
View angle: 0.70×0.70°


Tsuchinshan 1 on Feb 9, 2024
Tsuchinshan 1 on Dec 17, 2023

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