Deep Sky Object in Winter
M46 & M47 (Open Clusters in Puppis)
| Date & Time: | Dec 29 2016, from 26:06 to 26:43 JST(+0900) |
| Mosaic of 2 flames of composed 6shots with 3min. exposed |
| Optical: | TAKAHASHI 12.5cm(4.9") fluorite refractor with conversion lens (f=710mm, F5.7) |
| Auto-guided with VIXEN ATLUX Equatorial |
| Digital Camera: | Canon EOS 550D (Remodeled) |
| Location: | Ooizumi, Hokuto city, Yamanashi pref. |
| Camera Settings: | Recording Format...12bit CCD-RAW, converted to 16bit TIFF(5184×3456) |
| Sensitivity...ISO1600 |
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Planetary Nebula NGC2438
bathed in M46 |
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This picture shows two open clusters about 13 degrees east of Sirius (alpha CMa),
and with an interval of about 1.5 degree between them.
East Side one is M46 (NGC2437), and another one is M47 (NGC2422).
Scenery of those are extremely contrary, to say,
M46 consists of plenty of fine stars, but M47 is the brighter and sparse, includes several fifth magnitude stars.
Distances of M46 and M47 are about 5930 and 3740 light years respectively, they have no relation each other in the Galaxy space,
we can appreciate these two in the almost same field by chance.
And a left image shows a tiny planetary nebula of NGC2438 floating in M46 with a diameter of about 68".
The nebula is a remnant of star emitting gaseous matter in front of M46.
→ Jump to page of NGC2438
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| M46 (NGC2437) / Open Cluster, type f, II 2 r |
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| R.A. | 07h 41m 47.9s (2000.0) |
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| Dec. | -14° 49' 00" (2000.0) |
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| Apparent Size | 24' |
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| Real Size | 42 light yrs. |
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| # of Stars | 100 |
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| Magnitude | 6.0 |
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| Distance | 5930 light yrs. |
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| M47 (NGC2422) / Open Cluster, type d, I 3 m |
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| R.A. | 07h 36m 36.0s (2000.0) |
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| Dec. | -14° 30' 00" (2000.0) |
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| Apparent Size | 25' |
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| Real Size | 27 light yrs. |
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| # of Stars | 30 |
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| Magnitude | 4.5 |
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| Distance | 3740 light yrs. |
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