UBC 254
0.50
UTI
0.76
CN
0.4
Cdens
1.0
CC3
0.16
Clit
1.0
Cdup
Nm (P>50%)
114
Core radius and density
2.6 [pc], 2.0 [pc-2]
- CN 0.76 Rich
- Cdens 0.4 Loose
- CC3 1.0 Very high quality
- Clit 0.16 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 254 is a rich, loose object of very high 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, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is rarely studied in the literature.
Note: This object shares a significant percentage of members with a later reported entry. See table with shared members information.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 143.66 | -54.375 | 0.552 | -5.63 | 4.986 | 13.63 |
| Li et al. | 2025 | 143.659 | -54.375 | 0.525 | -5.63 | 4.964 | â |
| Hunt & Reffert | 2024 | 143.685 | -54.386 | 0.557 | -5.623 | 4.998 | 11.309 |
| Cavallo et al. | 2024 | 143.633 | -54.377 | 0.557 | â | â | â |
| Hunt & Reffert | 2023 | 143.685 | -54.386 | 0.557 | -5.623 | 4.998 | 11.309 |
| Cantat-Gaudin et al. | 2020 | 143.659 | -54.375 | 0.525 | -5.63 | 4.964 | â |
| Castro-Ginard et al. | 2020 | 143.637 | -54.372 | 0.525 | -5.628 | 4.963 | 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 | 1.69 | 0.72 | 0.49 | 185 | 0.165 | 459 | â | â |
| Li et al. | 2025 | 1.52 | 0.73 | â | 237 | -0.150 | â | â | â |
| Hunt & Reffert | 2024 | 1.69 | 0.71 | 0.49 | 185 | â | 459(1) | â | â |
| Cavallo et al. | 2024 | 1.94 | 0.86 | â | 229 | 0.480 | â | â | â |
| Hunt & Reffert | 2023 | 1.69 | 0.71 | 0.49 | 185 | â | â | â | â |
| Cantat-Gaudin et al. | 2020 | 1.78 | 0.67 | â | 110 | â | â | â | â |
| Kounkel et al. | 2020 | 1.69 | 0.87 | â | 110 | 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: 1.00 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).