UBC 661

0.53 UTI

0.39

C_N

0.73

C_dens

0.75

C_C3

0.4

C_lit

1.0

C_dup

N₅₀ (P>50% members) 39

Stellar density (N₅₀/rad) 3.7 [N/pc²]

C3 classification AB

C_N 0.39 Poorly populated
C_dens 0.73 Moderately dense
C_C3 0.75 High quality
C_lit 0.4 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 661 is a poorly populated, moderately dense object of high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, very young cluster (see Parameters). It is poorly studied in the literature.

Relatively close Low extinction Near-solar metallicity Very young

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 377 along with UBC_273.

Palma et al. (2025)
Classified as optical pair P74, along with UBC_273.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for UBC 661 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–	168.265	-61.159	0.428	-5.832	1.29	–
Li et al.	2025	168.158	-61.132	0.423	-5.847	1.28	–
Hunt & Reffert	2024	168.358	-61.214	0.426	-5.818	1.295	–
Cavallo et al.	2024	168.25	-61.167	0.425	–	–	–
Hunt & Reffert	2023	168.358	-61.214	0.426	-5.818	1.295	–
Cantat-Gaudin et al.	2020	168.158	-61.132	0.423	-5.847	1.28	–
Castro-Ginard et al.	2020	168.141	-61.143	0.423	-5.851	1.28	–

💡 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–	2.175	0.855	0.99	19	-0.191	269	–	–
Liu et al.	2025	3.34	0.37	–	19	–	–	–	–
Li et al.	2025	1.99	0.97	–	37	-0.162	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	269⁽¹⁾	–	–
Cavallo et al.	2024	2.19	0.91	–	14	-0.220	–	–	–
Hunt & Reffert	2023	2.16	0.80	0.99	19	–	–	–	–

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

Visualization

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