| Date & Time: | Sep 26 2025, from 26:08 to 27:04 JST(+0900) |
| Composed 7 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 EM-200 Equatorial+Lacerta M-GEN |
| CMOS Camera: | ZWO ASI2600MC Pro (Cooled temp.: -10°C) |
| Location: | Tamura city, Fukushima pref. |
| LBN 558 / Molecular Cloud, type 6 R |
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| R.A. | 22h 21m 00.0s (2000.0) |
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| Dec. | +75°18' 00" (2000.0) |
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| Apparent Size | 135×30' |
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| Real Size | N/A |
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| Magnitude | - |
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| Distance | N/A |
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| LDN1251 / Dark Nebula |
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| R.A. | 22h 36m 06.0s (2000.0) |
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| Dec. | +75°16' 00" (2000.0) |
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| Apparent Size | 27.0' |
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| Real Size | N/A |
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| Magnitude | - |
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| Distance | N/A |
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This image shows a faint molecular cloud and dark nebula located about 4.3 degrees southwest of γ Cephei, which marks the northernmost point of the Cepheus pentagon.
The molecular cloud, LBN 558, extends across almost the entire field of view and spans a little over 2 degrees east to west.
At its eastern end lies the complexly shaped dark nebula LDN 1251. These nebulae are denser portions of the vast molecular cloud known as the Cepheus Flare, which covers the northern part of Cepheus.
Though not very well known, this nebula is sometimes given the rather unflattering nickname "Rotten Fish Nebula".
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