UBC 1625

0.16 UTI

0.0

C_N

0.16

C_dens

0.5

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 21

Core radius and density 2.2 [pc], 0.8 [pc^-2]

C3 classification BB

C_N 0.0 Sparse
C_dens 0.16 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

ℹ️

UBC 1625 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by low extinction. It is catalogued as a metal-poor, intermediate-age cluster, but with a large variance across recent sources for the age parameter (see Parameters). It is rarely studied in the literature.

Note: This object shares a large 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 Low extinction Metal-poor Intermediate age

Palma et al. (2025)
Classified as optical pair P560, along with OC_0571.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Data

🔍 Search references for UBC 1625 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	178.464	-61.965	0.477	-4.971	1.214	–
Hunt & Reffert	2024	178.551	-61.962	0.477	-4.99	1.211	–
Cavallo et al.	2024	178.46	-61.977	0.476	–	–	–
Hunt & Reffert	2023	178.551	-61.962	0.477	-4.99	1.211	–
Castro-Ginard et al.	2022	178.48	-61.99	0.48	-4.98	1.22	–

💡 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–	1.91	0.5	0.215	178	-0.600	106	–	–
Hunt & Reffert	2024	1.91	0.46	0.22	263	–	106⁽¹⁾	–	–
Cavallo et al.	2024	1.84	1.27	–	93	-0.600	–	–	–
Hunt & Reffert	2023	1.91	0.46	0.21	263	–	–	–	–
Castro-Ginard et al.	2022	2.29	0.54	–	67	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWWDL 13592	84.0	178.54	-61.96	0.48	-4.97	1.21	–	0.04

💡 Note: The % column shows the percentage of members that UBC 1625 shares with each listed object.

Visualization

ℹ️

1 2