UBC 21

0.31 UTI

0.26

C_N

0.04

C_dens

0.38

C_C3

0.44

C_lit

1.0

C_dup

C3 classification BC

Number of members (P>50%) 26

Radius (P>50% members) 46.1 [arcmin]

C_N 0.26 Poorly populated
C_dens 0.04 Very loose
C_C3 0.38 Low quality
C_lit 0.44 Poorly studied
C_dup 1.0 Unique

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

Overview

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UBC 21 is a poorly populated, very loose object of low C3 quality. Its parallax locates it at a close distance, above 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.

Close Low extinction Near-solar metallicity Intermediate age

Data

🔍 Search references for UBC 21 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	–	130.507	-20.723	1.107	-6.471	2.541	19.418
Li et al.	2025	130.455	-20.747	1.118	-6.5	2.464	–
Alfonso et al.	2024	130.342	-22.272	0.932	-6.046	2.418	–
Cantat-Gaudin et al.	2020	130.455	-20.747	1.118	-6.5	2.464	–
Cantat-Gaudin & Anders	2020	130.455	-20.747	1.118	-6.5	2.464	–
Bica et al.	2019	130.318	-20.697	–	–	–	–
Castro-Ginard et al.	2018	130.35	-20.685	1.12	-6.511	2.482	–

💡 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	0.86	0.29	–	669	-0.149	–	–	–
Alfonso et al.	2024	0.92	0.10	–	3646	0.009	–	–	–
Tarricq et al.	2022	0.89	–	–	295	–	–	–	–
Cantat-Gaudin et al.	2020	0.92	0.10	–	302	–	–	–	–
Cantat-Gaudin & Anders	2020	0.87	–	–	–	–	–	–	–

Visualization

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