UBC 638

0.48 UTI

0.25

C_N

1.0

C_dens

0.5

C_C3

0.31

C_lit

1.0

C_dup

C3 classification DA

Number of members (P>50%) 25

Radius (P>50% members) 0.9 [arcmin]

C_N 0.25 Poorly populated
C_dens 1.0 Very dense
C_C3 0.5 Intermediate quality
C_lit 0.31 Poorly studied
C_dup 1.0 Unique

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

Overview

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UBC 638 is a poorly populated, very dense object of intermediate C3 quality. Its parallax locates it at a large distance, well above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, old cluster (see Parameters). It is poorly studied in the literature.

Note: This object shares a large percentage of members with at least one entry reported in the same catalogue. See table with shared members information.

Very distant Low extinction Near-solar metallicity Old

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst fit.

Data

🔍 Search references for UBC 638 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	–	123.752	-22.195	0.151	-2.1	2.065	99.131
Li et al.	2025	123.753	-22.201	0.088	-2.116	2.002	–
Almeida et al.	2025	123.758	-22.211	–	–	–	–
Dias et al.	2021	123.758	-22.211	0.136	-2.119	2.017	–
Cantat-Gaudin et al.	2020	123.753	-22.201	0.088	-2.116	2.002	–
Castro-Ginard et al.	2020	123.759	-22.224	0.09	-2.128	1.993	–

💡 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	5.27	0.21	–	2229	0.019	–	–	–
Almeida et al.	2025	5.36	0.52	–	2123	–	518	–	–
Dias et al.	2021	5.36	0.52	–	2123	-0.491	–	–	–
Cantat-Gaudin et al.	2020	6.17	0.55	–	1585	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 637	100.0	123.75	-22.2	0.18	-2.11	2.05	99.73	0.75

💡 Note: The % column shows the percentage of members that UBC 638 shares with each listed object.

Visualization

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