UPK 4
Summary
UPK 4 is a moderately populated, very dense object of very high C3 quality. It is located at a close distance from the Sun, below the mid-plane. It is well-studied in the literature.
Positions
| Reference | RA | DEC | Plx | pmRA | pmDE | Rv |
|---|---|---|---|---|---|---|
| Sim et al. (2019) | 281.373 | -23.744 | – | -2.03 | -6.4 | – |
| Cantat-Gaudin et al. (2020) | 281.361 | -23.764 | 1.239 | -2.009 | -6.373 | – |
| Dias et al. (2021) | 281.355 | -23.783 | 1.24 | -2.021 | -6.391 | – |
| Tarricq et al. (2022) | 281.321 | -23.827 | 1.236 | -2.021 | -6.401 | – |
| He et al. (2022) | 281.401 | -23.704 | 1.243 | -2.022 | -6.425 | – |
| Hunt & Reffert (2023) | 281.387 | -23.766 | 1.265 | -2.028 | -6.408 | 9.351 |
| Cavallo et al. (2024) | 281.335 | -23.812 | 1.266 | – | – | – |
| Hunt & Reffert (2024) | 281.387 | -23.766 | 1.265 | -2.028 | -6.408 | 9.351 |
| Alfonso et al. (2024) | 281.35 | -23.777 | 1.222 | -2.022 | -6.418 | – |
| Almeida et al. (2025) | 281.355 | -23.783 | – | – | – | – |
| UCC | 281.349 | -23.776 | 1.257 | -2.009 | -6.408 | 10.208 |
Estimated members
Explore data in Colab
Fundamental parameters
| Reference | Values |
|---|---|
| Sim et al. (2019) | d_pc=784, log(age)=8.45 |
| Cantat-Gaudin et al. (2020) | AVNN=1.04, DistPc=829.0, AgeNN=8.44 |
| Dias et al. (2021) | Av=1.389, Dist=770, logage=8.402, [Fe/H]=0.035 |
| Tarricq et al. (2022) | Dist=812, logAgeNN=8.46 |
| He et al. (2022) | A0=1.85, logAge=7.7 |
| Hunt & Reffert (2023) | AV50=1.239, diffAV50=1.542, MOD50=9.379, logAge50=8.196 |
| Cavallo et al. (2024) | AV50=1.39, dMod50=9.5, logAge50=8.54, [Fe/H]50=0.27 |
| Hunt & Reffert (2024) | MassJ=354.666, MassTot=367.136 |
| Alfonso et al. (2024) | AV=1.03964, MOD=9.58992, logAge=8.66973, Z=0.03503 |
| Almeida et al. (2025) | AV=1.389, Dist=770, logAge=8.402, MassRk=236.4 |
Search coordinates in Bayestar19