HSC 731
0.13
UTI
0.0
CN
0.08
Cdens
0.38
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
23
Core radius and density
1.6 [pc], 0.4 [pc-2]
- CN 0.0 Sparse
- Cdens 0.08 Very loose
- CC3 0.38 Low quality
- Clit 0.1 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 731 is a sparse, very loose object of low C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a 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.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 324.576 | 47.587 | 0.883 | -2.488 | -5.627 | -12.839 |
| Hu & Soubiran | 2025 | 324.596 | 47.587 | â | â | â | â |
| Zhang et al. | 2024 | 324.515 | 47.576 | â | â | â | â |
| Hunt & Reffert | 2024 | 324.515 | 47.576 | 0.876 | -2.492 | -5.641 | -9.296 |
| Cavallo et al. | 2024 | 324.596 | 47.587 | 0.879 | â | â | â |
| Hunt & Reffert | 2023 | 324.515 | 47.576 | 0.876 | -2.492 | -5.641 | -9.296 |
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 | 1.1 | 1.22 | 2.06 | 389 | -0.170 | 54 | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.110(5) | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.172(1) | â | â | â |
| Hunt & Reffert | 2024 | 1.10 | 1.22 | 2.06 | 389 | â | 54(1) | â | â |
| Cavallo et al. | 2024 | 1.09 | 1.27 | â | 589 | -0.170 | â | â | â |
| Hunt & Reffert | 2023 | 1.10 | 1.22 | 2.06 | 389 | 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: 0.48 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.48 (50th percentile).