PHOC 40
(OCSN 248)
0.32
UTI
0.37
CN
0.21
Cdens
0.75
CC3
0.13
Clit
1.0
Cdup
Nm (P>50%)
37
Core radius and density
1.7 [pc], 1.1 [pc-2]
- CN 0.37 Poorly populated
- Cdens 0.21 Very loose
- 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 40 is a poorly populated, very loose object of high C3 quality. Its parallax locates it at a very 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 age parameter (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 | 287.768 | 14.215 | 2.995 | -1.603 | -9.421 | 20.334 |
| Cavallo et al. | 2024 | 287.91 | 14.349 | 3.031 | â | â | â |
| Hunt & Reffert | 2023 | 287.721 | 14.005 | 2.998 | -1.74 | -9.607 | 20.068 |
| Qin et al. | 2023 | 287.67 | 14.14 | 3.05 | -1.54 | -9.49 | 19.88 |
| He et al. | 2022 | 287.61 | 14.072 | 3.018 | -1.537 | -9.44 | â |
| Hunt & Reffert | 2021 | 287.769 | 14.274 | 2.991 | -1.572 | -9.413 | 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 | 0.37 | 0.35 | 0.75 | 375 | 0.390 | â | â | â |
| Liu et al. | 2025 | 0.41 | 0.16 | â | 407 | â | â | â | â |
| Cavallo et al. | 2024 | 0.33 | 0.64 | â | 182 | 0.390 | â | â | â |
| Hunt & Reffert | 2023 | 0.32 | 0.22 | 0.75 | 375 | â | â | â | â |
| Qin et al. | 2023 | 0.43 | 0.73 | â | 100 | â | â | â | â |
| He et al. | 2022 | â | 0.35 | â | 794 | â | â | â | â |
Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 329 along with Theia_236.
Palma et al. (2025)
Classified as optical pair P563, along with Theia_236.
Cavallo et al. (2024)
Gold sample.
Hunt & Reffert (2024)
Classified as moving group. CMD class: 0.99 (50th percentile).
Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).