| Date & Time: | Sep 26 2025, from 20:56 to 21:54 JST(+0900) |
| Composed 8 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. |
| IC5146 / Diffused Nebula, type 1 E |
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| R.A. | 21h 53m 24.0s (2000.0) |
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| Dec. | +47°16' 00" (2000.0) |
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| Apparent Size | 12' |
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| Real Size | 19 light yrs. |
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| Magnitude | - |
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| Distance | 5500 light yrs. |
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| Other IDs | Sh2-125, LBN424 |
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| LDN1035 / Dark Nebula |
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| R.A. | 21h 44m 42.0s (2000.0) |
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| Dec. | +47°44' 00" (2000.0) |
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| Apparent Size | 20.0' |
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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 is a small, circular emission nebula with an apparent diameter of about 12 arc minutes, located near the boundary with Cepheus at the tip of Cygnus's tail.
Its shape has earned it the nickname "Cocoon Nebula."
A filamentary dark nebula extends westward from the main body, giving the impression that the Cocoon Nebula has drifted whimsically through the Milky Way, creating a very humorous sight.
Inside the circular nebula, one can also see a network of intricate dark lanes. The distance from the Solar System is approximately 5500 light-years.
At the right edge of the field, a group of rather complex dark nebulae is visible, identified as LDN 1035, 1042, 1045, and others.
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