HSC 2278
0.12
UTI
0.26
CN
0.1
Cdens
0.25
CC3
0.0
Clit
1.0
Cdup
Radius (P>50% members)
195.6 [arcmin]
- CN 0.26 Poorly populated
- Cdens 0.1 Very loose
- CC3 0.25 Low quality
- Clit 0.0 Rarely studied
- Cdup 1.0 Unique
Overview
HSC 2278 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, old cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It was recently reported in the literature.
â ī¸ Warning: the low UTI value and no obvious signs of duplication (Cdup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.
Very close
Low extinction
Near-solar metallicity
Old
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | â | 169.079 | -25.051 | 7.861 | -9.271 | 0.677 | 2.209 |
| Hu & Soubiran | 2025 | 169.663 | -23.463 | â | â | â | â |
| Cavallo et al. | 2024 | 169.663 | -23.463 | 7.944 | â | â | â |
| Hunt & Reffert | 2023 | 172.153 | -24.589 | 7.976 | -9.356 | 0.728 | 1.308 |
đĄ Note: The UCC values are estimated from its identified members.
| Reference | Year | Dist [kpc] | Av [mag] | DAv [mag] | Age [Myr] | [Fe/H] [dex] | Mass [Msun] | Bfr | BSS |
|---|---|---|---|---|---|---|---|---|---|
| Hu & Soubiran | 2025 | â | â | â | â | -0.260* | â | â | â |
| Cavallo et al. | 2024 | 0.13 | 0.44 | â | 1514 | 0.080 | â | â | â |
| Hunt & Reffert | 2023 | 0.12 | 0.09 | 0.29 | 570 | â | â | â | â |
(*): Indicates that this parameter is assigned more than one value in the corresponding reference.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as a moving group.