UBC 549
0.31
UTI
0.0
CN
0.15
Cdens
0.5
CC3
0.45
Clit
1.0
Cdup
Stellar density (N50/rad)
0.8 [N/pc2]
- CN 0.0 Sparse
- Cdens 0.15 Very loose
- CC3 0.5 Intermediate quality
- Clit 0.45 Poorly 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 549 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the absorption, age, and metallicity parameters (see Parameters). It is poorly studied in the literature.
Note: This object shares a small percentage of members with at least one entry reported in the same catalogue. 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 | 252.16 | -46.947 | 0.344 | -0.804 | -1.923 | â |
| Almeida et al. | 2025 | 252.158 | -46.919 | â | â | â | â |
| Hunt & Reffert | 2024 | 252.2 | -46.893 | 0.366 | -0.829 | -1.926 | -44.478 |
| Cavallo et al. | 2024 | 252.196 | -46.894 | 0.364 | â | â | â |
| Hunt & Reffert | 2023 | 252.2 | -46.893 | 0.366 | -0.829 | -1.926 | -44.478 |
| Dias et al. | 2021 | 252.158 | -46.919 | 0.327 | -0.788 | -1.924 | â |
| Cantat-Gaudin et al. | 2020 | 252.156 | -46.965 | 0.311 | -0.807 | -1.925 | â |
| Castro-Ginard et al. | 2020 | 252.154 | -46.94 | 0.313 | -0.803 | -1.928 | 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 | 3.015 | 2.42 | 2.25 | 38 | 0.172 | 479 | â | â |
| Liu et al. | 2025 | 5.55 | 0.78 | â | 138 | â | â | â | â |
| Almeida et al. | 2025 | 3.13 | 2.42 | â | 7 | â | 614 | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 344(1) | â | â |
| Cavallo et al. | 2024 | 2.05 | 2.78 | â | 43 | -0.110 | â | â | â |
| Hunt & Reffert | 2023 | 2.53 | 2.94 | 2.25 | 34 | â | â | â | â |
| Dias et al. | 2021 | 3.13 | 2.42 | â | 7 | 0.454 | â | â | â |
| Cantat-Gaudin et al. | 2020 | 2.90 | 1.92 | â | 85 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 262 along with Hogg_21.
Palma et al. (2025)
Classified as tidal capture (resonant trapping pair) P76, along with CWNU_2389.
Cavallo et al. (2024)
Gold sample.
Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: intermediate fit.