HSC 639
0.06
UTI
0.0
CN
0.03
Cdens
0.25
CC3
0.0
Clit
1.0
Cdup
Radius (P>50% members)
6.7 [arcmin]
- CN 0.0 Sparse
- Cdens 0.03 Very loose
- CC3 0.25 Low quality
- Clit 0.0 Rarely studied
- Cdup 1.0 Unique
Overview
HSC 639 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by high extinction. It is catalogued as an extremely massive, 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.
Distant
High extinction
Extremely massive
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 | 312.41 | 40.444 | 0.204 | -2.961 | -4.208 | -44.528 |
| Hunt & Reffert | 2024 | 312.409 | 40.461 | 0.216 | -2.911 | -4.235 | -46.033 |
| Cavallo et al. | 2024 | 312.393 | 40.441 | 0.218 | â | â | â |
| Hunt & Reffert | 2023 | 312.409 | 40.461 | 0.216 | -2.911 | -4.235 | -46.033 |
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 | 10117* | â | â |
| Cavallo et al. | 2024 | 4.55 | 3.65 | â | 204 | 0.090 | â | â | â |
| Hunt & Reffert | 2023 | 3.91 | 4.00 | 3.05 | 328 | â | â | â | â |
(*): Indicates that this parameter is assigned more than one value in the corresponding reference.
Cavallo et al. (2024)
Wood sample.