UBC 637

0.73 UTI

0.66

C_N

1.0

C_dens

1.0

C_C3

0.5

C_lit

1.0

C_dup

N₅₀ (P>50% members) 82

Stellar density (N₅₀/rad) 7.4 [N/pc²]

C3 classification AA

C_N 0.66 Moderately populated
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.5 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UBC 637 is a moderately populated, very dense object of very high C3 quality. Its parallax locates it at a large distance, well above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, old cluster, but with a large variance across recent sources for the absorption and metallicity parameters (see Parameters). It is moderately studied in the literature.

Note: This object shares a moderate percentage of members with at least one entry reported in the same catalogue. See table with shared members information.

Very distant Low extinction Near-solar metallicity Old

Cavallo et al. (2024)
Gold sample.

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst fit.

Data

🔍 Search references for UBC 637 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–	123.753	-22.198	0.175	-2.11	2.047	99.727
Li et al.	2025	123.755	-22.189	0.183	-2.149	2.021	–
Hu & Soubiran	2025	123.758	-22.192	–	–	–	–
Almeida et al.	2025	123.748	-22.18	–	–	–	–
Hunt & Reffert	2024	123.753	-22.193	0.169	-2.126	2.038	99.168
Cavallo et al.	2024	123.758	-22.192	0.171	–	–	–
Hunt & Reffert	2023	123.753	-22.193	0.169	-2.126	2.038	99.168
Dias et al.	2021	123.748	-22.18	0.176	-2.136	2.035	–
Cantat-Gaudin et al.	2020	123.755	-22.189	0.183	-2.149	2.021	–
Castro-Ginard et al.	2020	123.747	-22.175	0.185	-2.137	2.038	–

💡 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–	5.03	0.435	0.55	2002	-0.286	648	–	–
Li et al.	2025	5.33	0.19	–	2262	0.033	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.270⁽⁵⁾	–	–	–
Almeida et al.	2025	5.11	0.54	–	1871	–	767	–	–
Hunt & Reffert	2024	–	–	–	–	–	528⁽¹⁾	–	–
Cavallo et al.	2024	3.24	1.02	–	3631	-1.080	–	–	–
Hunt & Reffert	2023	4.95	0.12	0.55	2133	–	–	–	–
Dias et al.	2021	5.11	0.54	–	1871	-0.302	–	–	–
Cantat-Gaudin et al.	2020	4.68	0.33	–	1660	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 638	30.5	123.75	-22.19	0.15	-2.1	2.06	99.13	0.47

💡 Note: The % column shows the percentage of members that UBC 637 shares with each listed object.

Visualization

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