UPK 639
0.18
UTI
0.0
CN
0.3
Cdens
0.62
CC3
0.0
Clit
1.0
Cdup
Radius (P>50% members)
17.7 [arcmin]
- CN 0.0 Sparse
- Cdens 0.3 Loose
- CC3 0.62 Intermediate quality
- Clit 0.0 Rarely studied
- Cdup 1.0 Unique
Overview
UPK 639 is a sparse, 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 (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.
Close
Low extinction
Near-solar metallicity
Intermediate age
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | â | 261.234 | -46.56 | 1.408 | 1.056 | -9.313 | -19.501 |
| Cavallo et al. | 2024 | 261.142 | -46.594 | 1.401 | â | â | â |
| Hunt & Reffert | 2023 | 261.039 | -46.632 | 1.402 | 0.956 | -9.241 | -22.77 |
| Sim et al. | 2019 | 261.893 | -46.291 | â | 1.15 | -9.3 | 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] | Bfr | BSS |
|---|---|---|---|---|---|---|---|---|---|
| Cavallo et al. | 2024 | 0.65 | 0.49 | â | 490 | -0.080 | â | â | â |
| Hunt & Reffert | 2023 | 0.67 | 0.39 | 0.69 | 476 | â | â | â | â |
| Sim et al. | 2019 | 0.71 | â | â | 794 | â | â | â | â |
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as a moving group.