HSC 2559
0.24
UTI
0.28
CN
0.41
Cdens
0.38
CC3
0.06
Clit
1.0
Cdup
Nm (P>50%)
28
Core radius and density
1.1 [pc], 2.0 [pc-2]
- CN 0.28 Poorly populated
- Cdens 0.41 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 2559 is a poorly populated, loose object of low C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by low 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 | 197.665 | -66.998 | 0.727 | -12.849 | -3.359 | -24.563 |
| Hu & Soubiran | 2025 | 197.575 | -66.979 | â | â | â | â |
| Hunt & Reffert | 2024 | 197.701 | -66.987 | 0.724 | -12.868 | -3.311 | -23.5 |
| Cavallo et al. | 2024 | 197.574 | -66.979 | 0.728 | â | â | â |
| Hunt & Reffert | 2023 | 197.701 | -66.987 | 0.724 | -12.868 | -3.311 | -23.5 |
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 | 1.31 | 0.96 | 0.6 | 916 | 0.100 | 89 | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.190(5) | â | â | â |
| Hunt & Reffert | 2024 | 1.31 | 0.96 | 0.60 | 916 | â | 89(1) | â | â |
| Cavallo et al. | 2024 | 1.41 | 0.87 | â | 1259 | 0.390 | â | â | â |
| Hunt & Reffert | 2023 | 1.31 | 0.96 | 0.60 | 916 | 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: 0.89 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.89 (50th percentile).