PHOC 40

(OCSN 248)

0.52 UTI

0.37

C_N

0.76

C_dens

0.75

C_C3

0.35

C_lit

1.0

C_dup

N₅₀ (P>50% members) 37

Stellar density (N₅₀/rad) 3.8 [N/pc²]

C3 classification AB

C_N 0.37 Poorly populated
C_dens 0.76 Dense
C_C3 0.75 High quality
C_lit 0.35 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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PHOC 40 is a poorly populated, dense 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 poorly studied in the literature.

Very close Low extinction Near-solar metallicity Intermediate age

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 a moving group.

Data

🔍 Search references for PHOC 40 in: SciX Simbad

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Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	287.768	14.215	2.995	-1.603	-9.421	20.334
Cavallo et al.	2024	287.91	14.349	3.031	–	–	–
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	–
Hunt & Reffert	2021	287.769	14.274	2.991	-1.572	-9.413	–

💡 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]	B_frac	BSS
UCC	99999–	0.37	0.35	0.75	375	0.390	–	–	–
Liu et al.	2025	0.41	0.16	–	407	–	–	–	–
Cavallo et al.	2024	0.33	0.64	–	182	0.390	–	–	–
Hunt & Reffert	2023	0.32	0.22	0.75	375	–	–	–	–
Qin et al.	2023	0.43	0.71	–	100	–	–	–	–
He et al.	2022	–	0.35	–	794	–	–	–	–

Visualization

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