| 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 | Undated entry by Méchain: "Cluster of stars between Epsilon & Delta of the leg of Cassiopeia". As with 102, in the rush to publication, it was neither reconfirmed nor measured. M103 was the highest-numbered catalog listing published during Messier's 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.<--> This is a small, attractive open cluster in Cassiopeia, nestled in an interesting star field mottled by dark nebulae. I observed this as part of Dec 2023 Cloudy Nights EAA challenge. |
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