UBC 639

0.50 UTI

0.61

C_N

0.91

C_dens

1.0

C_C3

0.0

C_lit

1.0

C_dup

C3 classification AA

Number of members (P>50%) 72

Radius (P>50% members) 2.7 [arcmin]

C_N 0.61 Moderately populated
C_dens 0.91 Very dense
C_C3 1.0 Very high quality
C_lit 0.0 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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UBC 639 is a moderately populated, very dense object of very high C3 quality. Its parallax locates it at a large distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It is rarely studied in the literature.

Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.

Distant Moderate extinction Near-solar metallicity Intermediate age

Data

🔍 Search references for UBC 639 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	–	117.42	-26.843	0.197	-2.083	2.754	94.956
Li et al.	2025	117.422	-26.833	0.148	-2.121	2.706	–
Cantat-Gaudin et al.	2020	117.422	-26.833	0.148	-2.121	2.706	–
Castro-Ginard et al.	2020	117.424	-26.845	0.149	-2.122	2.72	–

💡 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]	Bfr	BSS
Li et al.	2025	3.96	1.02	–	461	-0.153	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Theia 2406	100.0	117.42	-26.85	0.21	-2.08	2.77	100.31	0.26

💡 Note: The % column shows the percentage of members that UBC 639 shares with each listed object.

Visualization

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