Deep Sky Object in Autumn
CED211 (Emission Nebula in Aquarius)


Date & Time: Nov 28 2021, from 18:12 to 19:01 JST(+0900)
Composed 13 shots with 4 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
with BaaderPlanetarium Moon&Skyglow 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


CED211 / Emission Nebula, type E
R.A.23h 43m 49.6s (2000.0)
Dec.-15°17' 04" (2000.0)
Apparent Size2.0×1.0'
Ral SizeN/A
Magnitude12.1
Distance640 light yrs.
Other IDs -
In the eastern region of Aquarius, this image has captured a variable star of R Aquarii positioned at 14 degrees west of β Ceti (Diphda). The star is a red giant changing brightness between 5th and 12th magnitude with 387 days in period. In addition, the star has a white dwarf as a companion star.
This image shows you that an emission nebula CED (Cederbrad) 211 is surrounding the R Aquarii with a diameter of 2 arc minutes. It is considered that the gas is the nova blast released from the white dwarf. The nova in 930 AD had been recorded in an ancient literature of Japan.

⇒ Display the spectral profile of CED211 (in new window)



Around Sivan 2
M31 (The Andromeda Galaxy)

Copyright(c) 2021 by Naoyuki Kurita, All rights reserved.
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