UBC 640

0.49 UTI

0.39

C_N

0.62

C_dens

0.75

C_C3

0.35

C_lit

1.0

C_dup

N₅₀ (P>50% members) 39

Stellar density (N₅₀/rad) 3.1 [N/pc²]

C3 classification AB

C_N 0.39 Poorly populated
C_dens 0.62 Moderately dense
C_C3 0.75 High quality
C_lit 0.35 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 640 is a poorly populated, moderately dense object of high C3 quality. Its parallax locates it at a large distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is poorly studied in the literature.

Distant Low extinction Near-solar metallicity Young

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for UBC 640 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–	120.607	-27.849	0.18	-2.496	3.141	–
Li et al.	2025	120.586	-27.873	0.185	-2.483	3.152	–
Hunt & Reffert	2024	120.624	-27.83	0.186	-2.496	3.148	–
Cavallo et al.	2024	120.601	-27.853	0.185	–	–	–
Hunt & Reffert	2023	120.624	-27.83	0.186	-2.496	3.148	–
Cantat-Gaudin et al.	2020	120.586	-27.873	0.185	-2.483	3.152	–
Castro-Ginard et al.	2020	120.565	-27.879	0.186	-2.477	3.138	–

💡 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–	4.87	0.855	1.0	70	-0.224	317	–	–
Li et al.	2025	5.04	0.96	–	30	0.062	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	317⁽¹⁾	–	–
Cavallo et al.	2024	4.00	1.00	–	71	-0.510	–	–	–
Hunt & Reffert	2023	5.56	0.75	1.00	69	–	–	–	–
Cantat-Gaudin et al.	2020	4.70	0.71	–	87	–	–	–	–

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

Visualization

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