UBC 258

0.66 UTI

0.47

C_N

0.94

C_dens

1.0

C_C3

0.44

C_lit

1.0

C_dup

C3 classification AA

Number of members (P>50%) 47

Radius (P>50% members) 4.2 [arcmin]

C_N 0.47 Poorly populated
C_dens 0.94 Very dense
C_C3 1.0 Very high 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 258 is a poorly populated, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It is poorly 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 Low extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for UBC 258 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	–	159.001	-57.628	0.387	-7.232	3.656	–
Almeida et al.	2025	158.88	-57.604	–	–	–	–
Hunt & Reffert	2024	159.055	-57.626	0.386	-7.228	3.683	–
Cavallo et al.	2024	159.011	-57.623	0.387	–	–	–
Hunt & Reffert	2023	159.055	-57.626	0.386	-7.228	3.683	–
Dias et al.	2021	158.88	-57.604	0.383	-7.229	3.573	–
Cantat-Gaudin et al.	2020	158.917	-57.615	0.393	-7.237	3.609	–
Castro-Ginard et al.	2020	158.88	-57.609	0.39	-7.227	3.591	–

💡 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
Almeida et al.	2025	2.41	0.82	–	25	–	819	–	–
Hunt & Reffert	2024	–	–	–	–	–	377*	–	–
Cavallo et al.	2024	2.45	1.10	–	32	0.090	–	–	–
Hunt & Reffert	2023	2.36	0.71	1.07	31	–	–	–	–
Dias et al.	2021	2.41	0.82	–	25	0.197	–	–	–
Cantat-Gaudin et al.	2020	2.42	0.55	–	41	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWWDL 2181	78.7	159.03	-57.63	0.39	-7.23	3.68	19.39	0.08

💡 Note: The % column shows the percentage of members that UBC 258 shares with each listed object.

Visualization

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