UBC 555
0.68
UTI
0.68
CN
1.0
Cdens
1.0
CC3
0.35
Clit
1.0
Cdup
Stellar density (N50/rad)
30.0 [N/pc2]
- CN 0.68 Moderately populated
- Cdens 1.0 Very dense
- CC3 1.0 Very high quality
- Clit 0.35 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 555 is a moderately populated, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by high extinction. It is catalogued as a massive, metal-rich, intermediate-age cluster, but with a large variance across recent sources for the distance parameter (see Parameters). It is poorly 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 | 256.586 | -41.586 | 0.581 | -0.7 | -0.523 | -10.074 |
| Hunt & Reffert | 2024 | 256.586 | -41.582 | 0.585 | -0.7 | -0.518 | 10.512 |
| Cavallo et al. | 2024 | 256.601 | -41.583 | 0.586 | â | â | â |
| Hunt & Reffert | 2023 | 256.586 | -41.582 | 0.585 | -0.7 | -0.518 | 10.512 |
| Cantat-Gaudin et al. | 2020 | 256.582 | -41.582 | 0.556 | -0.684 | -0.511 | â |
| Castro-Ginard et al. | 2020 | 256.615 | -41.584 | 0.557 | -0.685 | -0.514 | 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 | 1.71 | 3.12 | 2.31 | 260 | 0.620 | 1023 | â | â |
| Liu et al. | 2025 | 6.43 | 1.20 | â | 257 | â | â | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 1023(1) | â | â |
| Cavallo et al. | 2024 | 1.75 | 3.70 | â | 263 | 0.620 | â | â | â |
| Hunt & Reffert | 2023 | 1.60 | 3.82 | 2.31 | 94 | â | â | â | â |
| Cantat-Gaudin et al. | 2020 | 1.67 | 2.54 | â | 525 | 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) 381 along with UBC_554.
Palma et al. (2025)
Classified as optical pair P77, along with UBC_554.
Cavallo et al. (2024)
Gold sample.