| Date & Time: | Mar 22 2023, from 25:33 to 26:30 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 JP Equatorial+SBIG STV |
| CMOS Camera: | ZWO ASI2600MC Pro (Cooled temp.: -20°C) |
| Location: | Ooizumi, Hokuto city, Yamanashi pref. |
| Cr 399 / Open Cluster, type III 3 m |
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| R.A. | 19h 25m 24.0s (2000.0) |
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| Dec. | +20° 11' 00" (2000.0) |
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| Apparent Size | 60' |
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| Real Size | N/A |
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| # of Stars | 40 |
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| Magnitude | - |
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| Distance | N/A |
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| NGC6802 / Open Cluster, type I 1 m |
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| R.A. | 19h 30m 35.3s (2000.0) |
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| Dec. | +20°15' 47" (2000.0) |
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| Apparent Size | 5.0' |
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| Real Size | 5.4 light yrs. |
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| # of Stars | 50 |
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| Magnitude | - |
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| Distance | 3700 light yrs. |
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| Other IDs | Cr 400 |
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Cr399 is a sparse open cluster located about 8 degrees south of Albireo in the constellation of Cygnus.
Although it gives a faint impression of a star cluster, it is remarkable for the six stars that are beautifully aligned in an east-west direction and a pentagon that is adjacent to the south when viewed through binoculars.
All six stars are of 6th magnitude and stand out well.
Strictly speaking, there is a variation in the distance to these stars from 300 to 2,000 light-years, and they are not defined as a star cluster because they are not connected to each other, but rather a kind of asterism.
From the arrangement of these stars, they are nicknamed "Coat Hanger" in the United States.
It is impressive that they are so beautifully aligned, even though it may be a coincidence. I highly recommend taking a look at it once.
Immediately to the east of Cr399 is a small open cluster NGC 6802, with a visual diameter of 5 minutes.
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