HSC 823
0.11
UTI
0.0
CN
0.16
Cdens
0.38
CC3
0.0
Clit
1.0
Cdup
Radius (P>50% members)
17.4 [arcmin]
- CN 0.0 Sparse
- Cdens 0.16 Very loose
- CC3 0.38 Low quality
- Clit 0.0 Rarely studied
- Cdup 1.0 Unique
Overview
HSC 823 is a sparse, very loose object of low C3 quality. Its parallax locates it at a relatively close distance, above the mid-plane, affected by moderate 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.
Close
Moderate 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 | 333.343 | 61.419 | 0.991 | -3.568 | -3.647 | -20.416 |
| Hu & Soubiran | 2025 | 333.359 | 61.496 | â | â | â | â |
| Cavallo et al. | 2024 | 333.359 | 61.496 | 0.992 | â | â | â |
| Hunt & Reffert | 2023 | 333.435 | 61.41 | 0.991 | -3.539 | -3.65 | -20.419 |
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 | -0.010* | â | â | â |
| Cavallo et al. | 2024 | 0.90 | 1.55 | â | 1738 | -0.380 | â | â | â |
| Hunt & Reffert | 2023 | 0.97 | 1.82 | 1.53 | 402 | 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.