Deep Sky Object in Summer
Crescent Nebula (NGC6888 in Cygnus)
|Date & Time: ||Sep 23 2006, from 20:35 to 21:04 JST(+0900)
|Composed 4 shots with 9 minutes exposed|
|Optical: ||Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
|Auto-guided with Meade LX200 Equatorial & Pictor 201XT
|Digital Camera: ||Nikon D70 (Remodeled)
|Location: ||Ooizumi vil., Yamanashi pref.
|Camera Settings: ||Recording Format...12bit CCD-RAW, converted to 8bit TIFF(3008×2000)|
You can see a compact semicircular diffused nebula in this picture.
The nebula of NGC6888 has a nickname of "The Crescent Nebula", positioned about 6 degrees southwest of gamma Cygni (Sadr).
|NGC6888 / Diffused Nebula, type 1 E|
|R.A.||20h 12m 0.0s (2000.0)|
|Dec.||+38° 21' 00" (2000.0)|
|Real Size||15×10 light yrs.|
|Distance||3000 light yrs.|
|Other IDs||Sh2-105, LBN203|
At around this field, very fine diffused nebula of IC1318 is floating and surrounding gamma Cyg.
Actually, NGC6888 is part of IC1318, but the nebula is sufficiently bright by comparing with the nebulae in circumference,
NGC6888 is noticeable in long-exposed films.