UBC 1620
0.19
UTI
0.0
CN
0.27
Cdens
0.5
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
21
Core radius and density
1.1 [pc], 1.3 [pc-2]
- CN 0.0 Sparse
- Cdens 0.27 Loose
- CC3 0.5 Intermediate 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 1620 is a sparse, loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by high extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the distance parameter (see Parameters). It is rarely studied in the literature.
Note: This object shares a very small percentage of members with a later reported entry. See table with shared members information.
â ī¸ Warning: the low UTI value and no obvious signs of duplication (Cdup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 131.928 | -44.613 | 0.499 | -4.741 | 3.879 | â |
| Hunt & Reffert | 2024 | 131.952 | -44.614 | 0.502 | -4.731 | 3.876 | â |
| Cavallo et al. | 2024 | 131.925 | -44.595 | 0.502 | â | â | â |
| Hunt & Reffert | 2023 | 131.952 | -44.614 | 0.502 | -4.731 | 3.876 | â |
| Castro-Ginard et al. | 2022 | 131.91 | -44.57 | 0.5 | -4.76 | 3.89 | 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 | 2.03 | 3.02 | 0.68 | 9 | 0.120 | 222 | â | â |
| Liu et al. | 2025 | 7.76 | 1.12 | â | 9 | â | â | â | â |
| Hunt & Reffert | 2024 | 1.90 | 3.27 | 0.68 | 8 | â | 222(1) | â | â |
| Cavallo et al. | 2024 | 2.03 | 3.02 | â | 17 | 0.120 | â | â | â |
| Hunt & Reffert | 2023 | 1.90 | 3.27 | 0.68 | 8 | â | â | â | â |
| Castro-Ginard et al. | 2022 | 2.19 | 2.83 | â | 11 | 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) 375 along with UBC_246.
Palma et al. (2025)
Classified as optical pair P598, along with UBC_246.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.97 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.97 (50th percentile).