| Date & Time: | Apr 12 2024, from 26:17 to 27:45 JST(+0900) |
| Composed 12 shots with 8 minutes exposed |
| Optical: | TAKAHASHI 16cm(6.3") epsilon (f=530mm, F3.3) |
| with LPS-D1 Light-pollution suppression filter |
| Auto-guided with TAKAHASHI JP Equatorial & SBIG STV |
| CMOS Camera: | ZWO ASI2600MC Pro (Cooled temp.: -20°C) |
| Location: | Ooizumi, Hokuto city, Yamanashi pref. |
| Sh2-78 / Planetary Nebula |
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| R.A. | 19h 03m 10.3s (2000.0) |
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| Dec. | +14°06' 56" (2000.0) |
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| Apparent Size | 10.0' |
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| Real Size | 40 light yrs. |
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| Magnitude | - |
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| Distance | 14,000 light yrs. |
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| Other IDs | PK 46+3.1 |
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Sh2-78 is a planetary nebula seen 0.5 degrees northwest of ζ Aquarii, located at the northwest end of the constellation.
Emitting red Hα light, it appears like a faint emission nebula.
It forms a slightly obscure square shape of just over 10 arc minutes in size, partly due to the glare from ζ Aquarii and the faint starlight of the Milky Way.
Estimated to be around 14,000 light-years away from the Solar System, it has a calculated actual diameter of 40 light-years, suggesting it to be a very ancient planetary nebula.
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