UBC 438

0.20 UTI

0.57

C_N

0.12

C_dens

0.75

C_C3

0.23

C_lit

0.53

C_dup

N_m (P>50%) 64

Core radius and density 2.5 [pc], 0.6 [pc^-2]

C3 classification AB

C_N 0.57 Moderately populated
C_dens 0.12 Very loose
C_C3 0.75 High quality
C_lit 0.23 Rarely studied
C_dup 0.53 Likely unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UBC 438 is a moderately populated, very loose object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, very young cluster (see Parameters). It is rarely studied in the literature.

Note: This is likely a unique object, which shares a moderate percentage of members with at least one previously reported entry. See table with shared members information.

Distant Moderate extinction Near-solar metallicity Very young

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

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD classes: 0.44 (50th percentile), true positive? (human-assigned).

Hunt & Reffert (2023)
Classified as open cluster. CMD classes: 0.44 (50th percentile), true positive? (human-assigned).

Data

🔍 Search references for UBC 438 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–	94.821	15.289	0.211	0.141	-0.41	32.202
Almeida et al.	2025	94.821	15.294	–	–	–	–
Hunt & Reffert	2024	94.687	15.284	0.221	0.138	-0.427	32.197
Celli et al.	2024	94.851	15.287	–	–	–	–
Cavallo et al.	2024	94.815	15.293	0.222	–	–	–
Hunt & Reffert	2023	94.687	15.284	0.221	0.138	-0.427	32.197
Dias et al.	2021	94.821	15.294	0.184	0.135	-0.385	74.681
Cantat-Gaudin et al.	2020	94.851	15.287	0.207	0.155	-0.39	–
Castro-Ginard et al.	2020	94.831	15.29	0.212	0.149	-0.37	–

💡 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–	4.11	2.67	2.22	8	0.312	724	–	–
Almeida et al.	2025	4.11	2.58	–	5	–	724	–	–
Hunt & Reffert	2024	4.16	2.92	2.22	11	–	953⁽¹⁾	–	–
Celli et al.	2024	–	–	–	4	–	525	–	–
Cavallo et al.	2024	4.09	2.91	–	22	0.400	–	–	–
Hunt & Reffert	2023	4.16	2.92	2.22	11	–	–	–	–
Dias et al.	2021	4.11	2.58	–	5	0.224	–	–	–
Cantat-Gaudin et al.	2020	3.61	2.67	–	4	–	–	–	–
Kounkel et al.	2020	2.89	2.66	–	100	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
MWC 137	46.9	94.72	15.28	0.23	0.12	-0.41	–	0.2
HSC 1547	21.9	94.71	15.28	0.2	0.07	-0.4	–	0.03

💡 Note: The % column shows the percentage of members that UBC 438 shares with each listed object.

Visualization

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