UBC 1550
0.46
UTI
0.76
CN
0.59
Cdens
0.75
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
117
Core radius and density
1.4 [pc], 3.0 [pc-2]
- CN 0.76 Rich
- Cdens 0.59 Moderately dense
- CC3 0.75 High quality
- Clit 0.1 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
UBC 1550 is a rich, moderately 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 rarely studied in the literature.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 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] | Bfrac | BSS |
|---|---|---|---|---|---|---|---|---|---|
| UCC | 99999â | 2.27 | 2.955 | 2.375 | 284 | -0.190 | 1109 | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.660(5) | â | â | â |
| Hunt & Reffert | 2024 | 2.27 | 3.24 | 2.37 | 164 | â | 1109(1) | 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 |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).