| Date & Time: | Dec 24 2022, from 21:21 to 22:34 JST(+0900) |
| Composed 10 shots with 8 minutes exposed |
| Optical: | TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3) |
| with IDAS LPS-D1 Light-pollution suppression filter |
| Auto-guided with TAKAHASHI JP Equatorial+SBIG STV |
| CMOS Camera: | ZWO ASI2600MC Pro (Cooled temp.: -25°C) |
| Location: | Ooizumi, Hokuto city, Yamanashi pref. |
| Sh2-176 / Planetary Nebula, type 5 E |
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| R.A. | 00h 31m 53.6s (2000.0) |
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| Dec. | +57°22' 33" (2000.0) |
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| Apparent Size | 12.0' |
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| Real Size | 1.6 light yrs. |
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| Magnitude | - |
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| Distance | 460 light yrs. |
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| Other IDs | LBN 597, PK 120-5.1
PNG 120.2-5.3 |
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| LBN594 / Reflection Nebula, type 6 R |
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| R.A. | 00h 28m 39.0s (2000.0) |
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| Dec. | +56°42' 50" (2000.0) |
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| Apparent Size | 2.0' |
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| Real Size | N/A |
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| Magnitude | - |
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| Distance | N/A |
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| Other IDs | LBN 595 |
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Sh2-176 is an extraordinary faint planetary nebula positioned at about 1.5 degrees northwest of α-Cas.
The nebula has an apparent diameter of about 12 arc minutes and is emitting reddish Hα light.
Although the nebula has a round shape, we can recognize it like an arc-shaped in brighter southern side.
It's considered that the Sh2-176 is one of most ancient planetary nebulae,
at the present the gaseous matter emitted from a dead central star has distributed in a diameter of about 1.6 light years.
In this image, you can see a very faint reflection nebula of LBN 594 located about 50 minutes southwest of Sh2-176 at the bottom of the field.
The size is about 2 arc minutes, and you can see that the south side is slightly bluish.
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