Deep Sky Object in Winter
Abell 20 (Planetary Nebula in Canis Minor)


Date & Time: Nov 23 2025, from 25:28 to 26:22 JST(+0900)
Composed 10 shots with 6 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(2040×2040)
Device Size...10×10mm
Sensitivity...ISO4000, White Balance...Daylight


Abell 20 / Planetary nebula, type IIc
R.A.07h 22m 57.6s (2000.0)
Dec.+01°45' 34" (2000.0)
Apparent Size67.0"
Real SizeN/A
Magnitude16.3
DistanceN/A
Other IDsPK 214+7.1
Abell 20 is a small planetary nebula located at the southwestern edge of Canis Minor, about 5.4 degrees southwest of Procyon. It has a circular shape with an apparent diameter of just over 1 arcminute and shows a slightly bluish tint. The central star is a 16th-magnitude white dwarf.



Abell 13
Abell 24

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