HSC 257
0.20
UTI
0.0
CN
0.52
Cdens
0.5
CC3
0.0
Clit
1.0
Cdup
Radius (P>50% members)
4.7 [arcmin]
- CN 0.0 Sparse
- Cdens 0.52 Moderately dense
- CC3 0.5 Intermediate quality
- Clit 0.0 Rarely studied
- Cdup 1.0 Unique
Overview
HSC 257 is a sparse, moderately dense object of intermediate C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, young 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
High extinction
Near-solar metallicity
Young
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | â | 278.465 | -4.948 | 0.45 | -1.176 | -3.616 | 71.332 |
| Hunt & Reffert | 2024 | 278.466 | -4.955 | 0.438 | -1.176 | -3.628 | â |
| Cavallo et al. | 2024 | 278.493 | -4.93 | 0.438 | â | â | â |
| Hunt & Reffert | 2023 | 278.466 | -4.955 | 0.438 | -1.176 | -3.628 | 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 | 314* | â | â |
| Cavallo et al. | 2024 | 2.34 | 3.15 | â | 95 | 0.030 | â | â | â |
| Hunt & Reffert | 2023 | 2.09 | 3.21 | 1.95 | 26 | â | â | â | â |
(*): Indicates that this parameter is assigned more than one value in the corresponding reference.
Cavallo et al. (2024)
Gold sample.