Deep Sky Object in Winter
Sh2-308 (Diffused Nebula in Canis Major)

Click on image to enlarge

Date & Time: Dec 27 2019, from 24:51 to 26:48 JST(+0900)
Composed 24 shots with 5 minutes exposed
Optical: TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3)
with IDAS LPS-V4 Light-pollution suppression filter
Auto-guided with TAKAHASHI JP Equatorial & SBIG STV
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...35×24mm, Sensitivity...ISO3200


Sh2-308 / Diffused Nebula, type 2 E
R.A.06h 54m (2000.0)
Dec.-23° 56' (2000.0)
Apparent Size40'
Real Size30 light yrs.
Magnitude -
Distance4500 light yrs.
Sh2-308 is a dimmed and disk-shaped nebula positioned at 2.5 degrees west of ο2 CMa. The nebula has a round shape with a diameter of about 40 arc minutes, and has a 6.7th magnitude central star, one of the closest blue giants, the Wolf-Rayet star. It can be said that the nebula is a kind of planetary nebula because the emitted gaseous matter from the central star has formed the nebula. We can photograph the nebula with a greenish color due to the O-III lines from the ionized oxygen. However we cannot detect the nebula in our naked eyes. The nebula has a nickname of "Milk pod Nebula" due to a spout-like structure in northwest side.
This image has been cropped with a focal length of 700mm.

⇒ Display the spectral profile of Wolf-Rayet star WR6 (in new window)



Sh2-302
LBN1023

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