UBC 121

0.69 UTI

0.7

C_N

1.0

C_dens

0.75

C_C3

0.5

C_lit

1.0

C_dup

C3 classification AB

Number of members (P>50%) 90

Radius (P>50% members) 5.6 [arcmin]

C_N 0.7 Moderately populated
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.5 Moderately studied
C_dup 1.0 Unique

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

Overview

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UBC 121 is a moderately populated, very dense object of high C3 quality. Its parallax locates it at a relatively close distance, near 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 age and metallicity parameters (see Parameters). It is moderately studied in the literature.

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

Relatively close Moderate extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for UBC 121 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	–	288.888	12.84	0.587	-1.255	-3.389	-25.612
Li et al.	2025	288.891	12.844	0.567	-1.238	-3.355	–
Almeida et al.	2025	288.906	12.859	–	–	–	–
Hunt & Reffert	2024	288.879	12.847	0.578	-1.261	-3.386	-9.078
Cavallo et al.	2024	288.891	12.838	0.587	–	–	–
Hunt & Reffert	2023	288.879	12.847	0.578	-1.261	-3.386	-9.078
Dias et al.	2021	288.906	12.859	0.553	-1.252	-3.346	–
Cantat-Gaudin et al.	2020	288.891	12.844	0.567	-1.238	-3.355	–
Castro-Ginard et al.	2020	288.893	12.855	0.565	-1.248	-3.347	–

💡 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	0.81	2.18	–	1198	-0.134	–	–	–
Almeida et al.	2025	1.64	2.84	–	12	–	554	–	–
Hunt & Reffert	2024	–	–	–	–	–	1202*	–	–
Cavallo et al.	2024	1.75	3.12	–	182	0.580	–	–	–
Hunt & Reffert	2023	1.58	3.40	2.38	45	–	–	–	–
Dias et al.	2021	1.64	2.84	–	12	0.024	–	–	–
Cantat-Gaudin et al.	2020	1.61	2.19	–	162	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWWDL 2361	77.8	288.89	12.84	0.59	-1.26	-3.4	0.68	0.01

💡 Note: The % column shows the percentage of members that UBC 121 shares with each listed object.

Visualization

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