Comet 2017O1 ASASSN on Sep 30, 2017


Date & Time: Sep 30 2017, from 24:38 to 25:06 JST(+0900)
Composed 8 shots with 4min. exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with a conversion lens (f=1600mm, F6.3)
with BaaderPlanetarium UV/IR cut filter
Auto-guided with Meade LX200 Equatorial & Pictor 201XT
Digital Camera: Canon EOS 600D (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording format...14bit CCD-RAW, converted to 16bit TIFF(5184×3456)
Sensitivity...ISO3200



Comet 2017O1 ASASSN & California Nebula

Date & Time: Sep 30 2017, from 24:40 to 25:09 JST(+0900)
Composed 8 shots with 4min. exposed
Optical: BORG 45EDII with a conversion lens (f=227mm, F5.1)
with IDAS LPS-P1 Light-pollution suppression filter
Auto-guided with VIXEN ATLUX Equatorial
Digital Camera: Nikon D810A
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording format...14bit CCD-RAW, converted to 16bit TIFF(7360×4912)
Device Size...FX format (36×24mm)
Sensitivity...ISO3200, White Balance...Daylight


The comet 2017O1 ASASSN in that day has positioned around 4 degrees east of the California nebula in Perseus with a coma brightness of 8th magnitude, detected a short tail stretched in southwest direction. The comet has already its maximum brightness, and moves northward from now on. We will observe the comet in higher midnight skies under good conditions in Oct 2017.
  The 1st image has been cropped with an equivalent f=1720mm. (View angle: 0.74×0.49°)
  The 2nd image: View angle: 9.04×6.05°


Comet 2017O1 ASASSN on Nov 11, 2017
Comet Tuttle-Giacobini-Kresak on May 20, 2017

Copyright(c) 2017 by Naoyuki Kurita, All rights reserved.
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