UBC 1620

0.27 UTI

0.0

C_N

0.27

C_dens

0.5

C_C3

0.3

C_lit

1.0

C_dup

N₅₀ (P>50% members) 21

Stellar density (N₅₀/rad) 1.3 [N/pc²]

C3 classification BB

C_N 0.0 Sparse
C_dens 0.27 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 1620 is a sparse, 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, very young cluster, but with a large variance across recent sources for the distance parameter (see Parameters). It is poorly studied in the literature.

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

Relatively close Moderate extinction Near-solar metallicity Very young

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 375 along with UBC_246.

Palma et al. (2025)
Classified as optical pair P598, along with UBC_246.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for UBC 1620 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–	131.928	-44.613	0.499	-4.741	3.879	–
Hunt & Reffert	2024	131.952	-44.614	0.502	-4.731	3.876	–
Cavallo et al.	2024	131.925	-44.595	0.502	–	–	–
Hunt & Reffert	2023	131.952	-44.614	0.502	-4.731	3.876	–
Castro-Ginard et al.	2022	131.91	-44.57	0.5	-4.76	3.89	–

💡 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–	2.11	2.925	0.68	10	0.120	222	–	–
Liu et al.	2025	7.76	1.12	–	9	–	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	222⁽¹⁾	–	–
Cavallo et al.	2024	2.03	3.02	–	17	0.120	–	–	–
Hunt & Reffert	2023	1.90	3.27	0.68	8	–	–	–	–
Castro-Ginard et al.	2022	2.19	2.83	–	11	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
HSC 2132	8.0	131.88	-44.97	0.51	-4.66	3.74	–	0.12

💡 Note: The % column shows the percentage of members that UBC 1620 shares with each listed object.

Visualization

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