UPK 99
0.36
UTI
0.0
CN
0.14
Cdens
0.38
CC3
0.65
Clit
1.0
Cdup
Radius (P>50% members)
23.3 [arcmin]
- CN 0.0 Sparse
- Cdens 0.14 Very loose
- CC3 0.38 Low quality
- Clit 0.65 Moderately studied
- Cdup 1.0 Unique
Overview
UPK 99 is a sparse, very loose object of low C3 quality. Its parallax locates it at a close distance, below the mid-plane, affected by low extinction. It is catalogued as a low-mass, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the absorption, age, and metallicity parameters (see Parameters). It is moderately studied in the literature.
Close
Low extinction
Low mass
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 | 312.459 | 25.556 | 1.249 | 0.31 | -7.976 | -15.464 |
| Li et al. | 2025 | 312.427 | 25.488 | 1.291 | 0.422 | -8.02 | â |
| Hu & Soubiran | 2025 | 312.476 | 25.713 | â | â | â | â |
| Almeida et al. | 2025 | 312.423 | 25.505 | â | â | â | â |
| Alfonso et al. | 2024 | 312.567 | 25.552 | 1.174 | 0.38 | -7.667 | â |
| Cavallo et al. | 2024 | 312.476 | 25.713 | 1.256 | â | â | â |
| Hunt & Reffert | 2023 | 312.479 | 25.561 | 1.258 | 0.225 | -7.911 | -11.93 |
| Dias et al. | 2021 | 312.423 | 25.505 | 1.276 | 0.351 | -7.897 | â |
| Cantat-Gaudin et al. | 2020 | 312.427 | 25.488 | 1.291 | 0.422 | -8.02 | â |
| Cantat-Gaudin & Anders | 2020 | 312.479 | 25.556 | 1.252 | 0.332 | -7.877 | â |
| Sim et al. | 2019 | 312.486 | 25.604 | â | 0.27 | -7.84 | 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 | 0.90 | 0.63 | â | 1801 | -0.158 | â | â | â |
| Hu & Soubiran | 2025 | â | â | â | â | -0.210* | â | â | â |
| Almeida et al. | 2025 | 0.77 | 0.51 | â | 212 | â | 42 | â | â |
| Alfonso et al. | 2024 | 0.76 | 0.28 | â | 135 | -0.100 | â | â | â |
| Cavallo et al. | 2024 | 0.81 | 0.06 | â | 813 | 0.270 | â | â | â |
| Hunt & Reffert | 2023 | 0.76 | 0.23 | 0.40 | 216 | â | â | â | â |
| Tarricq et al. | 2022 | 0.75 | â | â | 166 | â | â | â | â |
| Dias et al. | 2021 | 0.77 | 0.51 | â | 212 | -0.100 | â | â | â |
| Cantat-Gaudin et al. | 2020 | 0.76 | 0.28 | â | 158 | â | â | â | â |
| Cantat-Gaudin & Anders | 2020 | 0.78 | â | â | â | â | â | â | â |
| Sim et al. | 2019 | 0.78 | â | â | 126 | â | â | â | â |
(*): Indicates that this parameter is assigned more than one value in the corresponding reference.
Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: good fit.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as a moving group.