Comet Pons-Brooks on Mar 9, 2024


f=1600mm prime focus

Date & Time: Mar 9 2024, from 18:45 to 18:52 JST(+0900)
Composed 4 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


Click on image to enlarge

f=300mm telephoto lens

Date & Time: Mar 9 2024, from 18:45 to 18:53 JST(+0900)
Composed 6 shots with 2 minutes exposed
Optical: TAMRON SP 300mmF2.8, stop: F3.5
with IDAS LPS-D1 Light-pollution suppression filter
Auto-guided with TAKAHASHI JP Equatorial
CMOS Camera: ZWO ASI2600MC Pro (Cooled temp.: -25°C)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording format...16bit FITS, converted to 16bit TIFF(6248×4176)
Device Size...23.5×15.7mm, Gain...100


This page shows you images of comet Pons-Brooks captured before the end of twilight. It was located in the northwestern low sky in the evening, about 5 degrees northeast of α Andromedae (Alpheratz). Due to the influence of low-altitude clouds, it was not possible to capture images after the end of twilight. The brightness of the coma was about 5th magnitude, and the length of the ion tail estimated from the second image captured with a telephoto lens is about 2 degrees. It can be seen that the structure of the ion tail has changed significantly compared to the image taken a week ago.
1st image: View angle: 0.70×0.70°
2nd image: View angle: 3.0×4.5°


Pons-Brooks on Mar 16, 2024
Pons-Brooks on Mar 2, 2024

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