UBC 634

0.40 UTI

0.56

C_N

0.18

C_dens

0.75

C_C3

0.26

C_lit

1.0

C_dup

N_m (P>50%) 62

Core radius and density 2.0 [pc], 0.9 [pc^-2]

C3 classification AB

C_N 0.56 Moderately populated
C_dens 0.18 Very loose
C_C3 0.75 High quality
C_lit 0.26 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 634 is a moderately populated, very loose object of high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate 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 significant percentage of members with a later reported entry. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Data

🔍 Search references for UBC 634 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–	109.945	-18.988	0.323	-1.704	1.421	49.45
Li et al.	2025	109.928	-18.975	0.321	-1.698	1.406	–
Almeida et al.	2025	109.939	-18.976	–	–	–	–
Hunt & Reffert	2024	109.941	-18.988	0.326	-1.724	1.421	49.329
Cavallo et al.	2024	109.985	-19.012	0.327	–	–	–
Hunt & Reffert	2023	109.941	-18.988	0.326	-1.724	1.421	49.329
Almeida et al.	2023	109.944	-18.982	–	–	–	–
Dias et al.	2021	109.939	-18.976	0.319	-1.694	1.456	–
Cantat-Gaudin et al.	2020	109.928	-18.975	0.321	-1.698	1.406	–
Castro-Ginard et al.	2020	109.931	-18.973	0.324	-1.696	1.396	–

💡 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–	2.83	1.02	1.89	99	-0.015	312	0.55	–
Li et al.	2025	2.82	0.91	–	62	0.058	–	–	–
Almeida et al.	2025	2.85	1.05	–	99	–	232	–	–
Hunt & Reffert	2024	2.66	0.83	1.89	223	–	404⁽¹⁾	–	–
Cavallo et al.	2024	2.83	1.15	–	166	-0.080	–	–	–
Hunt & Reffert	2023	2.66	0.83	1.89	223	–	–	–	–
Almeida et al.	2023	2.65	1.02	–	65	-0.117	312⁽¹⁾	0.55	–
Dias et al.	2021	2.85	1.05	–	99	0.049	–	–	–
Cantat-Gaudin et al.	2020	2.95	0.58	–	178	–	–	–	–
Kounkel et al.	2020	2.84	1.24	–	48	–	–	–	–

(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 268	58.1	109.97	-19.03	0.32	-1.69	1.48	49.45	0.08

💡 Note: The % column shows the percentage of members that UBC 634 shares with each listed object.

Visualization

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