| Designation(s) | M103, NGC 581 |
| Object Type(s) | Open Cluster |
| Relevant Catalog(s) | All (Chron), Messier, NGC |
| Obs. Lat/Long | 42° 17', 073° 57' |
| Constellation | Cassiopeia |
| Date and Time Observed | 2023-12-06 07:29:00 |
| Instrument | Askar V 80mm extender 600mm |
| Camera | ASI294mc-Pro |
| Image Details | Up is 273.3 degrees E of N. Total integration time was 5m 30s. Exposures 30s@305g, UV/IR Cut Filter. Darks subtracted, no flats. Dithered and recentered in SharpCap. No guiding.. |
| Description | Small, attractive cluster in Cassiopeia, part of Dec EAA challenge. M103 was the highest catalog number in the Messier catalog during his lifetime. M104-110 were added by later astronomers based on observing notes and writings that showed Messier or his assistant, Méchain had observed them after the last publication date of their catalog. |
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