HSC 831
0.17
UTI
0.25
CN
0.09
Cdens
0.38
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
25
Core radius and density
2.6 [pc], 0.4 [pc-2]
- CN 0.25 Poorly populated
- Cdens 0.09 Very loose
- CC3 0.38 Low quality
- Clit 0.06 Rarely studied
- Cdup 1.0 Unique
đĨ Members
đ Colab
đŦ Bayestar19
MOCA
đ CDS
đ Simbad
đ CDS (Îą, δ)
đ Simbad (Îą, δ)
MOCA
đ CDS
đ Simbad
đ CDS (Îą, δ)
đ Simbad (Îą, δ)
Overview
HSC 831 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a large distance, above the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, intermediate-age 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.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 339.913 | 58.979 | 0.177 | -3.562 | -1.335 | â |
| Hu & Soubiran | 2025 | 339.885 | 58.976 | â | â | â | â |
| Hunt & Reffert | 2024 | 339.916 | 58.986 | 0.191 | -3.532 | -1.314 | â |
| Cavallo et al. | 2024 | 339.885 | 58.976 | 0.189 | â | â | â |
| Hunt & Reffert | 2023 | 339.916 | 58.986 | 0.191 | -3.532 | -1.314 | 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] | Bfrac | BSS |
|---|---|---|---|---|---|---|---|---|---|
| UCC | 99999â | 4.46 | 3.57 | 1.34 | 419 | 0.095 | 466 | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.140(5) | â | â | â |
| Hunt & Reffert | 2024 | 4.46 | 3.57 | 1.34 | 419 | â | 466(1) | â | â |
| Cavallo et al. | 2024 | 3.77 | 3.15 | â | 1072 | 0.330 | â | â | â |
| Hunt & Reffert | 2023 | 4.46 | 3.57 | 1.34 | 419 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.95 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.95 (50th percentile).