| Date & Time: | Nov 21 2025, from 25:42 to 27:36 JST(+0900) |
| Composed 20 shots with 6 minutes exposed |
| Optical: | BORG 67FL with a conversion lens (f=210mm, F3.4) |
| with IDAS LPS-D1 light-pollution suppression filter |
| Auto-guided with TAKAHASHI JP Equatorial |
| CMOS Camera: | ZWO ASI2600MC Pro (Cooled temp.: -20°C) |
| Location: | Ooizumi, Hokuto city, Yamanashi pref. |
| Sh2-304 / Diffused Nebula, type 5 E |
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| R.A. | 06h 43m 30.0s (2000.0) |
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| Dec. | -24°07' 00" (2000.0) |
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| Apparent Size | 180.0×30.0' |
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| Real Size | 200×30 light yrs. |
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| Magnitude | - |
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| Distance | 3800 light yrs. |
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| Other IDs | LBN 1049 |
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This image captures a wide field of 6.4×4.3 degrees, showcasing the Hα nebula Sh2-304, which spans the central region of the constellation Canis Major.
Although Sh2-304 is extremely faint, it extends nearly 3 degrees in the north-south direction.
Alongside Sh2-303, visible in the upper left corner of the image, the nebula is part of an interstellar gas region ionized by the light from the Wolf-Rayet star (WR6) at the center of the "Milk Pot Nebula" (Sh2-308), located on the left side of the frame.
The estimated distance to Sh2-304 varies significantly across studies, with an average of about 3800 light-years.
The nebulae visible in this image, as well as the broader interstellar gas, are associated with the "Canis Major OB2 Association", a stellar group in the region.
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Objects around Sh2-304 |
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