HSC 558
0.06
UTI
0.0
CN
0.05
Cdens
0.25
CC3
0.0
Clit
1.0
Cdup
Nm (P>50%)
24
Core radius and density
3.8 [pc], 0.2 [pc-2]
- CN 0.0 Sparse
- Cdens 0.05 Very loose
- CC3 0.25 Low quality
- Clit 0.0 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 558 is a sparse, very loose object of low C3 quality. Its parallax locates it at a very close distance, above the mid-plane, affected by moderate extinction. It is catalogued as an old cluster (see Parameters). It was recently reported in the literature.
Note: This object shares a small percentage of members with at least one entry reported in the same catalogue. See table with shared members information.
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 | 288.021 | 39.097 | 3.87 | -5.878 | 3.686 | -27.427 |
| Hunt & Reffert | 2023 | 287.872 | 38.809 | 3.927 | -6.002 | 3.902 | -27.423 |
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 | 0.25 | 2.9 | 0.36 | 1972 | â | â | â | â |
| Hunt & Reffert | 2023 | 0.25 | 2.90 | 0.36 | 1972 | â | â | â | â |
Palma et al. (2025)
Part of multiple system G182, along with HSC_570 and HSC_594.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.23 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.23 (50th percentile).