PHOC 31
0.42
UTI
0.56
CN
0.53
Cdens
0.75
CC3
0.13
Clit
1.0
Cdup
Nm (P>50%)
63
Core radius and density
1.9 [pc], 2.7 [pc-2]
- CN 0.56 Moderately populated
- Cdens 0.53 Moderately dense
- CC3 0.75 High quality
- Clit 0.13 Rarely studied
- Cdup 1.0 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
PHOC 31 is a moderately populated, moderately dense object of high C3 quality. Its parallax locates it at a relatively close distance, near 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 absorption, age, and metallicity parameters (see Parameters). It is rarely studied in the literature.
Data
| Reference | Year | RA [deg] | DEC [deg] | Plx [mas] | pmRA [mas/yr] | pmDE [mas/yr] | Rv [km/s] |
|---|---|---|---|---|---|---|---|
| UCC | 99999â | 168.742 | -59.405 | 0.935 | -6.85 | 2.382 | -15.874 |
| Wei et al. | 2025 | 168.76 | -59.418 | 0.941 | -6.855 | 2.372 | â |
| Hunt & Reffert | 2024 | 168.735 | -59.43 | 0.921 | -6.872 | 2.374 | -16.114 |
| Cavallo et al. | 2024 | 168.702 | -59.394 | 0.932 | â | â | â |
| Hunt & Reffert | 2023 | 168.735 | -59.43 | 0.921 | -6.872 | 2.374 | -16.114 |
| He et al. | 2022 | 168.735 | -59.427 | 0.933 | -6.847 | 2.365 | â |
| Hunt & Reffert | 2021 | 168.752 | -59.39 | 0.914 | -6.839 | 2.321 | 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 | 1.04 | 0.16 | 0.65 | 188 | -0.005 | 174 | 0.22 | â |
| Wei et al. | 2025 | 1.12 | 0.48 | â | 661 | -0.250 | 135 | 0.22 | â |
| Hunt & Reffert | 2024 | 1.03 | 0.16 | 0.65 | 188 | â | 213(1) | â | â |
| Cavallo et al. | 2024 | 1.05 | 0.00 | â | 417 | 0.240 | â | â | â |
| Hunt & Reffert | 2023 | 1.03 | 0.16 | 0.65 | 188 | â | â | â | â |
| He et al. | 2022 | â | 0.45 | â | 79 | â | â | â | â |
(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.
Palma et al. (2025)
Classified as optical pair (not dynamically associated) P144, along with HSC_2418.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.98 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).