UBC 203

0.68 UTI

0.76

C_N

1.0

C_dens

0.75

C_C3

0.45

C_lit

1.0

C_dup

N₅₀ (P>50% members) 129

Stellar density (N₅₀/rad) 6.0 [N/pc²]

C3 classification AB

C_N 0.76 Rich
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 203 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age 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 Moderate extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for UBC 203 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–	97.785	15.059	0.308	-0.158	-1.085	45.03
Li et al.	2025	97.793	15.059	0.256	-0.122	-1.105	–
Hu & Soubiran	2025	97.782	15.068	–	–	–	–
Zhang et al.	2024	97.811	15.064	–	–	–	–
Hunt & Reffert	2024	97.811	15.064	0.321	-0.148	-1.068	47.49
Cavallo et al.	2024	97.782	15.068	0.319	–	–	–
Hunt & Reffert	2023	97.811	15.064	0.321	-0.148	-1.068	47.49
Cantat-Gaudin et al.	2020	97.793	15.059	0.256	-0.122	-1.105	–
Castro-Ginard et al.	2020	97.789	15.063	0.259	-0.131	-1.096	–

💡 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–	2.99	1.705	2.03	720	-0.239	904	–	–
Li et al.	2025	3.02	1.75	–	866	-0.358	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.120⁽⁵⁾	–	–	–
Zhang et al.	2024	–	–	–	–	-0.593⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	904⁽¹⁾	–	–
Cavallo et al.	2024	2.96	2.02	–	537	0.000	–	–	–
Hunt & Reffert	2023	2.75	1.66	2.03	573	–	–	–	–
Cantat-Gaudin et al.	2020	3.09	1.21	–	1096	–	–	–	–

(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 2661	94.6	97.79	15.07	0.31	-0.17	-1.07	46.56	0.1
OC 0326	45.0	97.79	15.06	0.32	-0.17	-1.09	43.8	0.0

💡 Note: The % column shows the percentage of members that UBC 203 shares with each listed object.

Visualization

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