Deep Sky Object in Summer
Around Pipe Nebula to Antares

Date & Time: May 5 2013, from 24:23 to 25:37 JST(+0900)
Mosaic of 2 flames of 8min.×4shots
Optical: AF zoom-Nikkor ED 80-200mmF2.8 (f=80mm, Aperture: F2.8)
with Astronomik CLS-CCD filter
Auto-guided with TAKAHASHI EM-200 Equatorial
Digital Camera: Canon EOS 550D (Remodeled)
Location: Koumi town, Nagano pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(5184×3456)
CCD Sensitivity...ISO800

LDN1773 / Dark Nebula, type 6 Ir
R.A.17h 30m (rough position)
Dec.-26° (rough position)
Apparent Size420'×120'
Real SizeAbout 100 light yrs.
This Milky Way field image shows you very complicated dark nebulae around between Sagittarius and Scorpius. Especially it's noticeable a striking dark flow from the Milky Way to north of Antares, alpha Sco. You can find rho Ophiuchi at the western end of the flow and dimmed bluish light is being emitted. This diffused nebula has a number of IC4603-4, just a tiny part of the vast dark nebula stream. And there are many other red and orange diffused nebulae around Antares, one of most colorful, beautiful, and photogenic star fields in heavens.
You can detect a huge lump of dark nebula stretched in east-west direction on the left-hand side of picture. The dark nebula has a span of about 7 degrees and real length is estimated about 100 light years. You can appreciate the nebula as a big hole in the Milky Way only with binoculars under conditioned sky. This patch in the Milky Way has a catalogue number of "LDN 1773" and a nickname of "Pipe Nebula" from its shape.

Objects around Pipe Nebula to Antares Objects around Pipe Nebula to Antares

Celestial bodies around Galactic center

Close-up of Pipe nebula

Copyright(c) 2013 by Naoyuki Kurita, All rights reserved.
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