HSC 1731
0.49
UTI
0.56
CN
0.39
Cdens
1.0
CC3
0.25
Clit
1.0
Cdup
Radius (P>50% members)
1.9 [arcmin]
- CN 0.56 Moderately populated
- Cdens 0.39 Loose
- CC3 1.0 Very high quality
- Clit 0.25 Poorly studied
- Cdup 1.0 Unique
Overview
HSC 1731 is a moderately populated, loose object of very high C3 quality. Its parallax locates it at a very large* distance, well below the mid-plane, affected by moderate extinction. It is catalogued as a metal-poor, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It was recently reported in the literature.
(*): The parallax distance estimate (~10.20 kpc) differs significantly from the median photometric distance (~6.85 kpc).
Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.
Very distant
Moderate extinction
Metal-poor
Intermediate age
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | â | 98.666 | -8.859 | 0.098 | 0.174 | 0.443 | 69.459 |
| Hu & Soubiran | 2025 | 98.663 | -8.858 | â | â | â | â |
| Hunt & Reffert | 2024 | 98.654 | -8.865 | 0.085 | 0.163 | 0.458 | 69.479 |
| Cavallo et al. | 2024 | 98.663 | -8.858 | 0.09 | â | â | â |
| Hunt & Reffert | 2023 | 98.654 | -8.865 | 0.085 | 0.163 | 0.458 | 69.479 |
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 | -0.310* | â | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 978* | â | â |
| Cavallo et al. | 2024 | 5.08 | 1.87 | â | 1175 | -0.870 | â | â | â |
| Hunt & Reffert | 2023 | 8.62 | 1.60 | 0.78 | 643 | â | â | â | â |
(*): Indicates that this parameter is assigned more than one value in the corresponding reference.
Cavallo et al. (2024)
Gold sample.