Deep Sky Object in Winter
Horse Head Nebula & NGC2024 in Orion

Date & Time: Feb 18 2012, from 22:20 to 23:11 JST(+0900)
Composed 6 shots with 10min. exposed
Optical: TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3)
with Astronomik CLS-CCD filter
Auto-guided with TAKAHASHI JP Equatorial & SBIG STV
Digital Camera: Canon EOS 550D (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...14bit CCD-RAW, converted to 16bit TIFF(5184×3456)
CCD Sensitivity...ISO1600

There are two unique diffused nebulae around zeta Ori (Altanik). This picture has been displayed by turning north direction to left. Firstly, a faint and vast one spread at south of Altanik is famous as "The Horsehead Nebula, Barnard 33", a reddish nebula as a background of the horsehead-shaped dark cloud is registered in a catalogue as IC434, that is spread to about 3.5 degree SW, around The Great Orion Nebula. It's extremely difficult to detect with our eyes.
The other one just east of Altanik, NGC2024 is able to be seen with naked eyes in good conditioned sky (of course needs binoculars or scopes). It has about a same size with full moon, and complicated shaped dark filaments divide the nebula into two parts of east and west. The gaseous nebula has a nickname of "The Christmas Tree Nebula" in English, but has no popular name in Japan.

To wide field B&W image (66KB)
To Close-up of Horse-head Nebula (65KB)
To Close-up of NGC2024 (64KB)

Objects around Horse head nebula
Objects around Horse head nebula
B33 / Dark Nebula, type 4 Ir
R.A.05h 41m 1.8s (2000.0)
Dec.-02° 24' 40" (2000.0)
Apparent Size -
Real SizeN/A
Magnitude -
Distance1300 light yrs.
Other IDsLDN1630
IC434 / Diffused Nebula, type 1 E
R.A.05h 41m 0.0s (2000.0)
Dec.-02° 24' 00" (2000.0)
Apparent Size60×10'
Real Size22.7×3.8 light yrs.
Magnitude -
Distance1300 light yrs.
Other IDsLBN954
NGC2024 / Diffused Nebula, type 1 E
R.A.05h 41m 54.0s (2000.0)
Dec.-01° 51' 00" (2000.0)
Apparent Size30'
Real Size11 light yrs.
Magnitude -
Distance1300 light yrs.
Other IDsSh2-277


Monkey Nebula(NGC2174-5)

Copyright(c) 2012 by Naoyuki Kurita, All rights reserved.
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