HSC 557
0.18
UTI
0.0
CN
0.26
Cdens
0.62
CC3
0.0
Clit
1.0
Cdup
Stellar density (N50/rad)
1.3 [N/pc2]
- CN 0.0 Sparse
- Cdens 0.26 Loose
- CC3 0.62 Intermediate 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 557 is a sparse, loose object of intermediate C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, very young 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 | 301.384 | 32.702 | 0.917 | -2.344 | -7.897 | 2.956 |
| Hunt & Reffert | 2024 | 301.367 | 32.711 | 0.925 | -2.339 | -7.904 | 2.936 |
| Cavallo et al. | 2024 | 301.399 | 32.655 | 0.916 | â | â | â |
| Hunt & Reffert | 2023 | 301.367 | 32.711 | 0.925 | -2.339 | -7.904 | 2.936 |
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 | 1.125 | 0.685 | 0.49 | 19 | -0.140 | 58 | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 58(1) | â | â |
| Cavallo et al. | 2024 | 1.20 | 0.99 | â | 6 | -0.140 | â | â | â |
| Hunt & Reffert | 2023 | 1.05 | 0.38 | 0.49 | 32 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Palma et al. (2025)
Part of multiple system G244, along with Theia_4069, PHOC_37 and Theia_3010.
Cavallo et al. (2024)
Silver sample.