UBC 647

0.34 UTI

0.27

C_N

0.04

C_dens

0.75

C_C3

0.32

C_lit

1.0

C_dup

N_m (P>50%) 27

Core radius and density 3.5 [pc], 0.2 [pc^-2]

C3 classification AB

C_N 0.27 Poorly populated
C_dens 0.04 Very loose
C_C3 0.75 High quality
C_lit 0.32 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 647 is a poorly populated, very loose object of high C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is poorly studied in the literature.

Relatively close Low extinction Near-solar metallicity Intermediate age

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

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 647 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–	116.62	-48.209	0.697	-2.146	1.714	-0.862
Li et al.	2025	116.643	-48.192	0.643	-2.243	1.694	–
Hu & Soubiran	2025	116.485	-48.213	–	–	–	–
Almeida et al.	2025	116.638	-48.243	–	–	–	–
Hunt & Reffert	2024	116.413	-48.275	0.717	-2.096	1.739	9.023
Cavallo et al.	2024	116.485	-48.213	0.717	–	–	–
Hunt & Reffert	2023	116.413	-48.275	0.717	-2.096	1.739	9.023
Tarricq et al.	2022	116.704	-48.178	0.715	-2.175	1.69	–
Jadhav & Subramaniam	2021	116.643	-48.192	–	–	–	–
Dias et al.	2021	116.638	-48.243	0.65	-2.228	1.672	–
Cantat-Gaudin et al.	2020	116.643	-48.192	0.643	-2.243	1.694	–
Castro-Ginard et al.	2020	116.637	-48.206	0.648	-2.229	1.679	–

💡 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–	1.45	0.29	0.34	848	-0.167	66	–	0
Li et al.	2025	1.22	0.40	–	990	-0.162	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.350⁽⁵⁾	–	–	–
Almeida et al.	2025	1.51	0.61	–	764	–	48	–	–
Hunt & Reffert	2024	1.33	0.15	0.34	824	–	76⁽¹⁾	–	–
Cavallo et al.	2024	1.34	0.29	–	871	0.280	–	–	–
Hunt & Reffert	2023	1.33	0.15	0.34	824	–	–	–	–
Tarricq et al.	2022	1.44	–	–	891	–	–	–	–
Jadhav & Subramaniam	2021	1.49	0.27	–	891	–	66	–	0⁽¹⁾
Dias et al.	2021	1.51	0.61	–	764	-0.172	–	–	–
Cantat-Gaudin et al.	2020	1.49	0.27	–	891	–	–	–	–
Kounkel et al.	2020	1.46	1.03	–	468	–	–	–	–

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

Visualization

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