UBC 281

0.63 UTI

0.49

C_N

1.0

C_dens

0.75

C_C3

0.45

C_lit

1.0

C_dup

N₅₀ (P>50% members) 49

Stellar density (N₅₀/rad) 5.1 [N/pc²]

C3 classification AB

C_N 0.49 Poorly populated
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.45 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UBC 281 is a poorly populated, very dense object of high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is poorly studied in the literature.

Note: This object shares a large percentage of members with 2 later reported entries. See table with shared members information.

Relatively close Low extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for UBC 281 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–	178.179	-64.599	0.406	-5.597	0.26	-29.693
Li et al.	2025	178.121	-64.593	0.365	-5.587	0.208	–
Almeida et al.	2025	178.12	-64.572	–	–	–	–
Hunt & Reffert	2024	178.107	-64.6	0.411	-5.599	0.258	-15.486
Cavallo et al.	2024	178.149	-64.571	0.412	–	–	–
Hunt & Reffert	2023	178.107	-64.6	0.411	-5.599	0.258	-15.486
Dias et al.	2021	178.12	-64.572	0.364	-5.616	0.208	–
Cantat-Gaudin et al.	2020	178.121	-64.593	0.365	-5.587	0.208	–
Castro-Ginard et al.	2020	178.126	-64.579	0.366	-5.619	0.203	–

💡 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–	2.3	0.885	1.55	32	0.020	450	–	–
Li et al.	2025	1.92	0.81	–	28	-0.146	–	–	–
Almeida et al.	2025	2.55	0.90	–	30	–	340	–	–
Hunt & Reffert	2024	–	–	–	–	–	559⁽¹⁾	–	–
Cavallo et al.	2024	1.91	0.85	–	110	0.020	–	–	–
Hunt & Reffert	2023	2.18	0.87	1.55	48	–	–	–	–
Dias et al.	2021	2.55	0.90	–	30	0.520	–	–	–
Cantat-Gaudin et al.	2020	2.42	0.95	–	35	–	–	–	–

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWWDL 532	79.6	178.1	-64.6	0.42	-5.6	0.29	-24.15	0.14
OC 0575	65.3	178.1	-64.6	0.41	-5.6	0.29	-26.92	0.17

💡 Note: The % column shows the percentage of members that UBC 281 shares with each listed object.

Visualization

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