UBC 645
0.24
UTI
0.25
CN
0.09
Cdens
0.38
CC3
0.25
Clit
1.0
Cdup
Radius (P>50% members)
4.1 [arcmin]
- CN 0.25 Poorly populated
- Cdens 0.09 Very loose
- CC3 0.38 Low quality
- Clit 0.25 Poorly studied
- Cdup 1.0 Unique
Overview
UBC 645 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a large distance, above the mid-plane, affected by low extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster (see Parameters). It is poorly studied 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.
Distant
Low extinction
Massive
Near-solar metallicity
Intermediate age
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | â | 123.82 | -33.814 | 0.162 | -2.2 | 3.08 | 101.044 |
| Almeida et al. | 2025 | 123.852 | -33.843 | â | â | â | â |
| Dias et al. | 2021 | 123.852 | -33.843 | 0.157 | -2.225 | 3.117 | â |
| Cantat-Gaudin et al. | 2020 | 123.855 | -33.814 | 0.166 | -2.198 | 3.124 | â |
| Castro-Ginard et al. | 2020 | 123.861 | -33.819 | 0.165 | -2.204 | 3.127 | â |
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 |
|---|---|---|---|---|---|---|---|---|---|
| Almeida et al. | 2025 | 4.88 | 0.68 | â | 721 | â | 1523 | â | â |
| Dias et al. | 2021 | 4.88 | 0.68 | â | 721 | -0.143 | â | â | â |
| Cantat-Gaudin et al. | 2020 | 5.04 | 0.30 | â | 933 | â | â | â | â |
Almeida et al. (2025)
Mass determination: good fit. Isochrone match: intermediate fit.