Deep Sky Object in Autumn
Around Sivan 2 (Diffused Nebula in Cassiopeia)

Click on image to enlarge

Date & Time: Nov 7 2021, from 19:21 to 22:10 JST(+0900)
Composed 42 shots with 4 minutes exposed
Optical: AF zoom-Nikkor 80-200mm F2.8ED (f=105mm, stop: F4.0)
with Astronomik CLS-CCD-FF filter
Auto-guided with TAKAHASHI JP Equatorial
Digital Camera: Canon EOS 6D (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(5472×3648)
Device Size...36×24mm, Sensitivity...ISO3200


Sivan 2 / Diffused Nebula
R.A.00h 14m 0.0s (2000.0)
Dec.+50°45' 00" (2000.0)
Apparent SizeApprox. 5°
Real SizeN/A
Magnitude -
DistanceN/A
This long-exposed field image shows you a corner in southern Cassiopeia slightly off from the Milky Way. We can detect an extraordinary dimmed but vast Hα region with a diameter of about 5 degrees at 7 degrees southwest from a bright emission nebula of NGC281 positioned at upper left-hand side in the image. The region was discovered by an astronomer J. P. Sivan in 1972, named as "Sivan 2". Although this image is indistinct, Sivan 2 has an outer region with reddish Hα color while looks greenish from OIII lines in the central part.
This image has been cropped with an equivalent focal length of 135mm with a field angle of 15°×10°.
Objects around Sivan 2 Nebulae & Star clusters around Sivan 2

Italic indicates ID of open clusters



Molecular Cloud around head of Cetus
CED211

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