UBC 609

0.18 UTI

0.0

C_N

0.09

C_dens

0.38

C_C3

0.31

C_lit

0.84

C_dup

C3 classification BC

Number of members (P>50%) 20

Radius (P>50% members) 5.1 [arcmin]

C_N 0.0 Sparse
C_dens 0.09 Very loose
C_C3 0.38 Low quality
C_lit 0.31 Poorly studied
C_dup 0.84 Very likely unique

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

Overview

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UBC 609 is a sparse, very loose object of low C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, very young cluster (see Parameters). It is poorly studied in the literature.

Note: This is very likely a unique object, which shares a small percentage of members with at least one previously reported entry. See table with shared members information.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=0.84) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Distant Moderate extinction Massive Near-solar metallicity Very young

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

Data

🔍 Search references for UBC 609 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	–	65.226	53.046	0.224	0.459	-0.726	–
Almeida et al.	2025	65.263	53.226	–	–	–	–
Celli et al.	2024	65.262	53.069	–	–	–	–
Dias et al.	2021	65.263	53.226	0.192	0.471	-0.642	-49.94
Cantat-Gaudin et al.	2020	65.262	53.069	0.198	0.474	-0.667	–
Castro-Ginard et al.	2020	65.217	53.187	0.199	0.478	-0.654	–

💡 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	3.90	2.58	–	5	–	2216	–	–
Celli et al.	2024	–	–	–	6	–	2887	–	–
Dias et al.	2021	3.90	2.58	–	5	-0.248	–	–	–
Cantat-Gaudin et al.	2020	3.65	2.38	–	6	–	–	–	–

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Mayer 2	16.0	65.0	53.16	0.25	0.31	-0.72	-25.2	0.06

💡 Note: The % column shows the percentage of members that UBC 609 shares with each listed object.

Visualization

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