UBC 1550
0.63
UTI
0.76
CN
1.0
Cdens
0.75
CC3
0.31
Clit
1.0
Cdup
Radius (P>50% members)
4.4 [arcmin]
- CN 0.76 Rich
- Cdens 1.0 Very dense
- CC3 0.75 High quality
- Clit 0.31 Poorly studied
- Cdup 1.0 Unique
Overview
UBC 1550 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is poorly studied in the literature.
Relatively close
Moderate 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 | 249.257 | -48.45 | 0.392 | -0.679 | -2.903 | 0.847 |
| Hu & Soubiran | 2025 | 249.232 | -48.433 | â | â | â | â |
| Hunt & Reffert | 2024 | 249.269 | -48.441 | 0.398 | -0.747 | -2.877 | -12.019 |
| Cavallo et al. | 2024 | 249.232 | -48.433 | 0.398 | â | â | â |
| Hunt & Reffert | 2023 | 249.269 | -48.441 | 0.398 | -0.747 | -2.877 | -12.019 |
| Castro-Ginard et al. | 2022 | 249.26 | -48.45 | 0.4 | -0.66 | -2.91 | 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 |
|---|---|---|---|---|---|---|---|---|---|
| Hu & Soubiran | 2025 | â | â | â | â | -0.660* | â | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 1109* | â | â |
| Cavallo et al. | 2024 | 1.91 | 2.60 | â | 871 | 0.280 | â | â | â |
| Hunt & Reffert | 2023 | 2.27 | 3.24 | 2.38 | 164 | â | â | â | â |
| Castro-Ginard et al. | 2022 | 2.77 | 2.67 | â | 404 | â | â | â | â |
(*): Indicates that this parameter is assigned more than one value in the corresponding reference.
Cavallo et al. (2024)
Gold sample.