Deep Sky Object in Summer
NGC6781 (Planetary Nebula in Aquila)

Date & Time: Apr 26 2004, from 25:33 to 26:14 JST(+0900)
Composed 4 shots with 8 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: Fujifilm FinePix S2 Pro
Location: Ooizumi vil., Yamanashi pref.

Camera Settings: Recording Format...12bit CCD-RAW, converted to 16bit TIFF(3024×2016)
CCD Sensitivity...ISO1600, White Balance...Auto

NGC6781 / Planetary Nebula, type IIIb+III
R.A.19h 18m 23.9s (2000.0)
Dec.+06° 33' 00" (2000.0)
Apparent Size1.8'
Real SizeN/A
Around center of Aquila, a large planetary nebula of NGC6781 is positioned about 3.8 degrees northwest from delta Aquilae. There are many planetary nebulae in field of Milky Way of the constellation of Aquila, above all NGC6781 is one of the largest one with a diameter of 1.8 arc minutes and easy to appreciate. The nebula has a round shape but your naked eyes cannot detect its color. This picture captured by a digital still camera shows you reddish outline and bluish green radiated from oxygen ion in its body.



Copyright(c) 2004 by Naoyuki Kurita, All rights reserved.
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