UPK 57
0.15
UTI
0.0
CN
0.05
Cdens
0.5
CC3
0.1
Clit
1.0
Cdup
Nm (P>50%)
24
Core radius and density
4.2 [pc], 0.2 [pc-2]
- CN 0.0 Sparse
- Cdens 0.05 Very 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
UPK 57 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, below 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 age parameter (see Parameters). It is rarely studied in the literature.
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 | 300.958 | 12.524 | 1.157 | -0.444 | -3.527 | -16.685 |
| Zhang et al. | 2024 | 300.914 | 12.642 | â | â | â | â |
| Hunt & Reffert | 2024 | 300.914 | 12.642 | 1.172 | -0.459 | -3.514 | -15.474 |
| Cavallo et al. | 2024 | 300.954 | 12.585 | 1.174 | â | â | â |
| Hunt & Reffert | 2023 | 300.914 | 12.642 | 1.172 | -0.459 | -3.514 | -15.474 |
| Sim et al. | 2019 | 300.941 | 12.432 | â | -0.45 | -3.56 | 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 | 0.815 | 0.16 | 0.6 | 543 | -0.077 | 79 | â | â |
| Zhang et al. | 2024 | â | â | â | â | -0.044(1) | â | â | â |
| Hunt & Reffert | 2024 | 0.80 | 0.16 | 0.60 | 543 | â | 79(1) | â | â |
| Cavallo et al. | 2024 | 0.84 | 0.67 | â | 93 | -0.110 | â | â | â |
| Hunt & Reffert | 2023 | 0.81 | 0.16 | 0.60 | 543 | â | â | â | â |
| Sim et al. | 2019 | 0.82 | â | â | 562 | 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).