HSC 552
0.17
UTI
0.0
CN
0.09
Cdens
0.25
CC3
0.25
Clit
1.0
Cdup
Radius (P>50% members)
44.6 [arcmin]
- CN 0.0 Sparse
- Cdens 0.09 Very loose
- CC3 0.25 Low quality
- Clit 0.25 Poorly studied
- Cdup 1.0 Unique
Overview
HSC 552 is a sparse, very loose object of low C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, old 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.
Close
Low extinction
Near-solar metallicity
Old
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | â | 280.247 | 40.331 | 1.837 | 5.252 | -14.877 | 14.286 |
| Hu & Soubiran | 2025 | 279.251 | 40.233 | â | â | â | â |
| Zhang et al. | 2024 | 280.499 | 40.464 | â | â | â | â |
| Cavallo et al. | 2024 | 279.251 | 40.233 | 1.853 | â | â | â |
| Hunt & Reffert | 2023 | 280.499 | 40.464 | 1.855 | 5.202 | -14.964 | 2.821 |
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] | Bfr | BSS |
|---|---|---|---|---|---|---|---|---|---|
| Hu & Soubiran | 2025 | â | â | â | â | 0.000* | â | â | â |
| Zhang et al. | 2024 | â | â | â | â | 0.335* | â | â | â |
| Cavallo et al. | 2024 | 0.58 | 0.37 | â | 2042 | 0.100 | â | â | â |
| Hunt & Reffert | 2023 | 0.52 | 0.19 | 0.60 | 6383 | â | â | â | â |
(*): Indicates that this parameter is assigned more than one value in the corresponding reference.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as a moving group.