Deep Sky Object in Summer
Cat's eye Nebula(NGC6543 in Draco)

Date & Time: Mar 19 2005, from 25:35 to 25:40 JST(+0900)
Composed 4shots with 30 seconds & 4shots with 13 seconds exposed
Optical: VIXEN 20cm(3.9") VISAC (f=1800mm, F9.0)
Auto-guided with TAKAHASHI JP Equatorial & Meade Pictor 201XT
Digital Camera: Nikon D70 (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...12bit CCD-RAW, converted to 8bit TIFF(3008×2000)
CCD Sensitivity...ISO1600

NGC6543 / Planetary Nebula, type IIIa+II
R.A.17h 58m 35.9s (2000.0)
Dec.+66° 38' 00" (2000.0)
Apparent Size22.0"
Real Size0.18 light yrs.
Distance1690 light yrs.
NGC6543 is a compact planetary nebula positioned in the constellation of Draco. The nebula has an apparent diameter of about 20 arc seconds and brightness of 9th magnitude, you can distinguish the nebula from normal stars through small scopes. And as you can see in this picture the nebula looks elliptical shape, the apparent figure can be appreciated by medium-sized telescopes over 6-inches in aperture. The nebula has several helical filaments being coiled up, the structure can be detected only with amateur telescopes under stable atmosphere conditions.
NGC6543 has a nickname of "The Cat's eye nebula" from its elliptical shape with a central star. The Hubble Space Telescope (HST) captured a splendid shot of the nebula, the picture made the nebula very popular including its unique nickname.



Copyright(c) 2005 by Naoyuki Kurita, All rights reserved.
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