UBC 646

0.34 UTI

0.25

C_N

0.1

C_dens

0.75

C_C3

0.31

C_lit

1.0

C_dup

C3 classification AB

Number of members (P>50%) 25

Radius (P>50% members) 3.7 [arcmin]

C_N 0.25 Poorly populated
C_dens 0.1 Very loose
C_C3 0.75 High quality
C_lit 0.31 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

ℹ️

UBC 646 is a poorly populated, very loose object of high C3 quality. Its parallax locates it at a large distance, above 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 mass parameter (see Parameters). It is poorly studied in the literature.

Very distant Moderate extinction Near-solar metallicity Very young

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

Data

🔍 Search references for UBC 646 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	–	124.087	-34.024	0.152	-2.554	3.257	90.735
Almeida et al.	2025	124.146	-34.034	–	–	–	–
Celli et al.	2024	124.111	-34.057	–	–	–	–
Dias et al.	2021	124.146	-34.034	0.115	-2.526	3.246	–
Cantat-Gaudin et al.	2020	124.111	-34.057	0.105	-2.529	3.28	–
Castro-Ginard et al.	2020	124.145	-34.044	0.1	-2.518	3.272	–

💡 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]	Bfr	BSS
Almeida et al.	2025	7.86	1.18	–	5	–	858	–	–
Celli et al.	2024	–	–	–	23	–	166	–	–
Dias et al.	2021	7.86	1.18	–	5	0.045	–	–	–
Cantat-Gaudin et al.	2020	6.37	0.67	–	23	–	–	–	–

Visualization

ℹ️

1 2