UBC 377

0.25 UTI

0.0

C_N

0.17

C_dens

0.5

C_C3

0.3

C_lit

1.0

C_dup

N₅₀ (P>50% members) 24

Stellar density (N₅₀/rad) 0.8 [N/pc²]

C3 classification BB

C_N 0.0 Sparse
C_dens 0.17 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.3 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 377 is a sparse, very loose object of intermediate 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, young cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is poorly studied in the literature.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Relatively close Moderate extinction Near-solar metallicity Young

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

Data

🔍 Search references for UBC 377 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–	314.906	45.862	0.333	-2.946	-2.854	-25.816
Li et al.	2025	314.906	45.861	0.32	-2.943	-2.803	–
Almeida et al.	2025	314.854	45.853	–	–	–	–
Dias et al.	2021	314.854	45.853	0.319	-2.939	-2.831	–
Cantat-Gaudin et al.	2020	314.906	45.861	0.32	-2.943	-2.803	–
Castro-Ginard et al.	2020	314.869	45.858	0.318	-2.931	-2.815	–

💡 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–	2.905	1.555	–	30	0.110	237	–	–
Li et al.	2025	2.41	1.01	–	693	0.046	–	–	–
Almeida et al.	2025	2.98	1.83	–	13	–	237	–	–
Dias et al.	2021	2.98	1.83	–	13	0.173	–	–	–
Cantat-Gaudin et al.	2020	2.83	1.28	–	48	–	–	–	–

Visualization

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