UBC 631

0.20 UTI

0.0

C_N

0.02

C_dens

0.75

C_C3

0.13

C_lit

1.0

C_dup

N_m (P>50%) 16

Core radius and density 3.6 [pc], 0.08 [pc^-2]

C3 classification AB

C_N 0.0 Sparse
C_dens 0.02 Very loose
C_C3 0.75 High quality
C_lit 0.13 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UBC 631 is a sparse, very loose object of high C3 quality. Its parallax locates it at a large distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is rarely studied in the literature.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Distant Moderate extinction Near-solar metallicity Young

Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: good fit.

Data

🔍 Search references for UBC 631 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–	112.709	-14.161	0.193	-1.401	1.641	–
Li et al.	2025	112.709	-14.148	0.195	-1.381	1.633	–
Almeida et al.	2025	112.709	-14.141	–	–	–	–
Dias et al.	2021	112.709	-14.141	0.194	-1.4	1.651	–
Cantat-Gaudin et al.	2020	112.709	-14.148	0.195	-1.381	1.633	–
Castro-Ginard et al.	2020	112.714	-14.144	0.193	-1.387	1.631	–

💡 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–	4.81	1.505	–	24	-0.103	516	–	–
Li et al.	2025	4.80	0.79	–	519	-0.041	–	–	–
Almeida et al.	2025	4.82	1.56	–	10	–	516	–	–
Dias et al.	2021	4.82	1.56	–	10	-0.166	–	–	–
Kounkel et al.	2020	4.66	1.45	–	39	–	–	–	–

Visualization

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