HSC 2817
0.16
UTI
0.0
CN
0.15
Cdens
0.5
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
20
Core radius and density
2.0 [pc], 0.8 [pc-2]
- CN 0.0 Sparse
- Cdens 0.15 Very loose
- CC3 0.5 Intermediate 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 2817 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age and metallicity parameters (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 | 252.771 | -47.05 | 1.309 | -1.79 | -6.38 | -5.228 |
| Hu & Soubiran | 2025 | 252.896 | -46.903 | â | â | â | â |
| Hunt & Reffert | 2024 | 252.761 | -47.118 | 1.301 | -1.798 | -6.343 | -1.694 |
| Cavallo et al. | 2024 | 252.896 | -46.903 | 1.298 | â | â | â |
| Hunt & Reffert | 2023 | 252.761 | -47.118 | 1.301 | -1.798 | -6.343 | -1.694 |
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 | 0.73 | 0.6 | 0.64 | 83 | 0.050 | 64 | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.110(5) | â | â | â |
| Hunt & Reffert | 2024 | 0.73 | 0.61 | 0.64 | 83 | â | 64(1) | â | â |
| Cavallo et al. | 2024 | 0.77 | 0.17 | â | 513 | 0.210 | â | â | â |
| Hunt & Reffert | 2023 | 0.73 | 0.60 | 0.64 | 83 | 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: 0.99 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).