Messier 103. NGC 581

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Messier 103 is a rather small and far away open cluster. It is located in the constellation Cassiopeia, close to the bright delta Cas (mag +2.81, eclipsing binary). This cluster has 172 confirmed stars, out of which, a prominent red giant star, of spectral type M6 III (located near its center) as well as several type B blue super giants. The bright blue star located in the upper right corner of the cluster (ADS 1209) is a foreground star and does not belong to it. Its distance has been estimated at 10,000 ly and it is a pretty young cluster, about 25 million years old.


Additional Information


Name(s): Messier 103. M103. NGC 581

Type: Open Cluster

RA:  01h 33m 22s

Dec: +60º 38’ 53”

Constellation: Cassiopeia

Size (arcmin): 6.5 arcmin

Magnitude: +7.4

Distance: 10,000 ly


Date: 2020-10-25 to 2020-11-11

Location: Curiosity2 Observatory, New Mexico Skies, Mayhill, NM, USA

Size (arcmin): 32×32 arcmin

Telescope: 24” (61 cm) f/6.5 Reflector

Camera: FLI PL16803 (4096x4096pix)

Guiding: Astrodon MonsterMOAG off-axis guider

Total exposure: 9h 20m (L: 3h 10m; RGB: 6h 10m)

Processing: CCDStack, Photoshop CC 2021

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