M103 · open cluster
Messier 103
Messier 103 is a small open cluster of many faint stars in Cassiopeia.
RA01h 33m 21sDec+60° 39' 28"
Image: Hillary Mathis, N.A.Sharp/NOIRLab/ NSF /AURA. CC BY 4.0, via Wikimedia Commons.
Identity & coordinates
Identification
- Primary designation
- M103
- All designations
- M103 · NGC 581
- Object type
- Open Cluster
- Constellation
- Cassiopeia
- Best viewing
- Autumn · Winter
Coordinates & physical
- Right ascension (J2000)
- 01h 33m 21s
- Declination (J2000)
- +60° 39' 28"
- Apparent magnitude (V)
- —
- Distance
- —
Visibility tonight
The science
Messier 103 is a small open cluster of many faint stars in Cassiopeia. It was discovered on 27 March 1781 by Pierre Méchain, but later added as Charles Messier's last deep-sky object in his catalogue.
Summary adapted from Wikipedia · CC-BY-SA-4.0
References
- SIMBAD Not resolved
- NED Fetched May 8, 2026 View in NED ↗
- Wikipedia Fetched May 8, 2026 Read full article ↗
Wikipedia title resolved via designation — fell back to an alternate catalog designation.
1 merge conflict resolved
- coordinates: SIMBAD missing → NED used