UBC 620

0.24 UTI

0.0

C_N

0.2

C_dens

0.5

C_C3

0.26

C_lit

1.0

C_dup

N_m (P>50%) 24

Core radius and density 1.3 [pc], 1.0 [pc^-2]

C3 classification BB

C_N 0.0 Sparse
C_dens 0.2 Very loose
C_C3 0.5 Intermediate 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 620 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a relatively close distance, below 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 metallicity parameter (see Parameters). It is poorly studied in the literature.

Note: This object shares a small percentage of members with a later reported entry. See table with shared members information.

⚠️ 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

Palma et al. (2025)
Classified as optical pair (not dynamically associated) P132, along with HSC_1649.

Almeida et al. (2025)
Mass determination: intermediate 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 620 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–	97.942	2.501	0.657	-1.664	-0.203	–
Almeida et al.	2025	97.964	2.531	–	–	–	–
Zhang et al.	2024	97.939	2.454	–	–	–	–
Hunt & Reffert	2024	97.939	2.454	0.664	-1.671	-0.21	–
Cavallo et al.	2024	97.967	2.511	0.663	–	–	–
Hunt & Reffert	2023	97.939	2.454	0.664	-1.671	-0.21	–
Dias et al.	2021	97.964	2.531	0.664	-1.6	-0.224	–
Cantat-Gaudin et al.	2020	97.923	2.501	0.659	-1.615	-0.203	–
Castro-Ginard et al.	2020	97.935	2.52	0.658	-1.61	-0.218	–

💡 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–	1.485	1.9	1.33	50	-0.130	156	–	–
Almeida et al.	2025	1.46	1.89	–	28	–	173	–	–
Zhang et al.	2024	–	–	–	–	-0.363⁽¹⁾	–	–	–
Hunt & Reffert	2024	1.51	1.90	1.33	51	–	139⁽¹⁾	–	–
Cavallo et al.	2024	1.53	2.11	–	34	-0.130	–	–	–
Hunt & Reffert	2023	1.51	1.90	1.33	52	–	–	–	–
Tarricq et al.	2022	1.38	–	–	63	–	–	–	–
Dias et al.	2021	1.46	1.89	–	28	0.137	–	–	–
Cantat-Gaudin et al.	2020	1.45	1.42	–	50	–	–	–	–
Kounkel et al.	2020	1.57	2.24	–	50	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
LISC-III 1682	16.0	98.27	2.47	0.63	-2.29	-0.53	-17.72	0.14

💡 Note: The % column shows the percentage of members that UBC 620 shares with each listed object.

Visualization

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