Deep Sky Object in Summer
Crescent Nebula (NGC6888 in Cygnus)
|Date & Time: ||Sep 28 2013, from 20:25 to 20:49 JST(+0900)
|Composed 4 shots with 8 minutes exposed|
|Optical: ||TAKAHASHI 16cm(6.3") epsilon with conversion lens (f=742mm, F4.6)
|with IDAS LPS-P2-FF Light-pollution suppression filter|
|Auto-guided with TAKAHASHI JP equatorial & SBIG STV
|Digital Camera: ||Canon EOS 600D (Remodeled)
|Location: ||Ooizumi, Hokuto city, Yamanashi pref.
|Camera Settings: ||Recording Format...14bit CCD-RAW, converted to 16bit TIFF(5184×3456)|
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.