UPK 644
0.76
UTI
0.66
CN
1.0
Cdens
0.75
CC3
0.7
Clit
1.0
Cdup
Radius (P>50% members)
14.9 [arcmin]
- CN 0.66 Moderately populated
- Cdens 1.0 Very dense
- CC3 0.75 High quality
- Clit 0.7 Moderately studied
- Cdup 1.0 Unique
Overview
UPK 644 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a close distance, above 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 moderately studied in the literature.
Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.
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 | 249.156 | -31.363 | 1.332 | -3.87 | -3.429 | -28.935 |
| Li et al. | 2025 | 249.155 | -31.418 | 1.313 | -3.846 | -3.458 | â |
| Almeida et al. | 2025 | 249.195 | -31.52 | â | â | â | â |
| Alfonso et al. | 2024 | 249.236 | -31.262 | 1.296 | -3.875 | -3.375 | â |
| Hunt & Reffert | 2024 | 249.134 | -31.338 | 1.344 | -3.92 | -3.346 | -22.492 |
| Cavallo et al. | 2024 | 249.523 | -30.961 | 1.343 | â | â | â |
| Hunt & Reffert | 2023 | 249.134 | -31.338 | 1.344 | -3.92 | -3.346 | -22.492 |
| He et al. | 2022 | 249.152 | -31.378 | 1.332 | -3.916 | -3.413 | â |
| Tarricq et al. | 2022 | 249.138 | -31.382 | 1.326 | -3.909 | -3.347 | â |
| Dias et al. | 2021 | 249.195 | -31.52 | 1.3 | -3.85 | -3.444 | -27.385 |
| Cantat-Gaudin et al. | 2020 | 249.155 | -31.418 | 1.313 | -3.846 | -3.458 | â |
| Cantat-Gaudin & Anders | 2020 | 249.16 | -31.418 | 1.305 | -3.87 | -3.436 | â |
| Sim et al. | 2019 | 249.111 | -31.414 | â | -3.94 | -3.46 | 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 |
|---|---|---|---|---|---|---|---|---|---|
| Li et al. | 2025 | 0.75 | 0.49 | â | 409 | 0.143 | â | â | â |
| Almeida et al. | 2025 | 0.76 | 0.75 | â | 352 | â | 228 | â | â |
| Alfonso et al. | 2024 | 0.74 | 0.34 | â | 673 | -0.028 | â | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 122* | â | â |
| Cavallo et al. | 2024 | 0.75 | 0.78 | â | 166 | 0.220 | â | â | â |
| Hunt & Reffert | 2023 | 0.71 | 0.41 | 0.70 | 327 | â | â | â | â |
| He et al. | 2022 | â | 0.90 | â | 50 | â | â | â | â |
| Tarricq et al. | 2022 | 0.73 | â | â | 186 | â | â | â | â |
| Dias et al. | 2021 | 0.76 | 0.75 | â | 352 | -0.028 | â | â | â |
| Cantat-Gaudin et al. | 2020 | 0.74 | 0.34 | â | 170 | â | â | â | â |
| Cantat-Gaudin & Anders | 2020 | 0.75 | â | â | â | â | â | â | â |
| Sim et al. | 2019 | 0.74 | â | â | 89 | â | â | â | â |
(*): Indicates that this parameter is assigned more than one value in the corresponding reference.
Almeida et al. (2025)
Mass determination: good fit. Isochrone match: good fit.
Cavallo et al. (2024)
Gold sample.