UPK 172
0.56
UTI
0.78
CN
1.0
Cdens
0.75
CC3
0.3
Clit
0.9
Cdup
Stellar density (N50/rad)
32.3 [N/pc2]
- CN 0.78 Rich
- Cdens 1.0 Very dense
- CC3 0.75 High quality
- Clit 0.3 Poorly studied
- Cdup 0.9 Very likely 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 172 is a rich, very dense object of high C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the absorption parameter (see Parameters). It is poorly studied in the literature.
Note: This is very likely a unique object, which shares a very small percentage of members with at least one previously reported entry. See table with shared members information.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 324.809 | 62.332 | 1.088 | -2.024 | -3.117 | -16.97 |
| Liu et al. | 2025 | 324.82 | 62.32 | 1.08 | -1.99 | -3.1 | -22.55 |
| Hunt & Reffert | 2024 | 324.822 | 62.324 | 1.081 | -1.987 | -3.096 | -22.551 |
| Cavallo et al. | 2024 | 324.954 | 62.398 | 1.089 | â | â | â |
| Hunt & Reffert | 2023 | 324.822 | 62.324 | 1.081 | -1.987 | -3.096 | -22.551 |
| Sim et al. | 2019 | 324.773 | 62.343 | â | -2.06 | -3.04 | 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 | 0.97 | 1.45 | 2.02 | 12 | -0.090 | 323 | â | â |
| Liu et al. | 2025 | 1.45 | 0.42 | â | 13 | â | â | â | â |
| Hunt & Reffert | 2024 | â | â | â | â | â | 323(1) | â | â |
| Cavallo et al. | 2024 | 1.03 | 1.48 | â | 5 | -0.090 | â | â | â |
| Hunt & Reffert | 2023 | 0.89 | 1.45 | 2.02 | 11 | â | â | â | â |
| Sim et al. | 2019 | 0.91 | â | â | 14 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Liu et al. (2025)
Classified as primordial binary cluster 296 along with NGC_7160, and as primordial binary cluster 387 along with UBC_10b, and of multiple system 77 along with NGC_7160 and UBC_10b.
Palma et al. (2025)
Part of multiple system G221, along with UBC_10a and NGC_7160.
Cavallo et al. (2024)
Gold sample.