Deep Sky Object in Autumn
Abell 84 (Planetary Nebula in Cassiopeia)


Date & Time: Oct 12 2024, from 25:58 to 26:52 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 84 / Planetary nebula, type IIIb
R.A.23h 47m 43.9s (2000.0)
Dec.+51°23' 56" (2000.0)
Apparent Size2.5×2.0'
Real Size3.7 light yrs.
Magnitude14.4
Distance5100 light yrs.
Other IDsPK 112-10.1
This captures a planetary nebula located at the southwestern edge of the constellation Cassiopeia. It can be found 8.3 degrees SSW of the westernmost star in Cassiopeia's W shape, β Cassiopeiae. The nebula spans over 2 arc minutes, classifying it as a medium-sized one. It has an incomplete circular shape with an indistinct shell structure visible in the east-west direction.



Abell 80
Abell 85

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