UBC 1501

0.23 UTI

0.32

C_N

0.22

C_dens

0.5

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 32

Core radius and density 1.5 [pc], 1.1 [pc^-2]

C3 classification BB

C_N 0.32 Poorly populated
C_dens 0.22 Very loose
C_C3 0.5 Intermediate quality
C_lit 0.06 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UBC 1501 is a poorly populated, 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, intermediate-age cluster (see Parameters). It is rarely 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 Intermediate age

Palma et al. (2025)
Classified as optical pair P597, along with UBC_1500.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Data

🔍 Search references for UBC 1501 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–	172.371	-61.255	0.31	-5.684	1.125	–
Hunt & Reffert	2024	172.366	-61.262	0.313	-5.664	1.135	–
Cavallo et al.	2024	172.376	-61.236	0.311	–	–	–
Hunt & Reffert	2023	172.366	-61.262	0.313	-5.664	1.135	–
Castro-Ginard et al.	2022	172.4	-61.23	0.31	-5.69	1.12	–

💡 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–	2.87	1.245	1.28	140	0.140	431	–	–
Hunt & Reffert	2024	2.87	1.42	1.28	131	–	431⁽¹⁾	–	–
Cavallo et al.	2024	2.75	0.93	–	251	0.140	–	–	–
Hunt & Reffert	2023	2.87	1.42	1.28	132	–	–	–	–
Castro-Ginard et al.	2022	3.39	1.07	–	148	–	–	–	–

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

Visualization

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