HSC 2257
0.11
UTI
0.0
CN
0.17
Cdens
0.38
CC3
0.0
Clit
1.0
Cdup
Radius (P>50% members)
15.2 [arcmin]
- CN 0.0 Sparse
- Cdens 0.17 Very loose
- CC3 0.38 Low quality
- Clit 0.0 Rarely studied
- Cdup 1.0 Unique
Overview
HSC 2257 is a sparse, very loose object of low C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (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.
Relatively close
Low extinction
Near-solar metallicity
Intermediate age
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | â | 145.4 | -54.318 | 0.838 | -7.214 | 4.494 | -8.756 |
| Hunt & Reffert | 2024 | 145.475 | -54.355 | 0.845 | -7.233 | 4.498 | â |
| Cavallo et al. | 2024 | 145.288 | -54.321 | 0.844 | â | â | â |
| Hunt & Reffert | 2023 | 145.475 | -54.355 | 0.845 | -7.233 | 4.498 | â |
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 |
|---|---|---|---|---|---|---|---|---|---|
| Hunt & Reffert | 2024 | â | â | â | â | â | 54* | â | â |
| Cavallo et al. | 2024 | 1.14 | 0.30 | â | 234 | 0.060 | â | â | â |
| Hunt & Reffert | 2023 | 1.15 | 0.24 | 0.56 | 193 | â | â | â | â |
(*): Indicates that this parameter is assigned more than one value in the corresponding reference.
Cavallo et al. (2024)
Gold sample.