UBC 490

0.40 UTI

0.58

C_N

0.24

C_dens

0.75

C_C3

0.23

C_lit

1.0

C_dup

N_m (P>50%) 66

Core radius and density 1.9 [pc], 1.2 [pc^-2]

C3 classification AB

C_N 0.58 Moderately populated
C_dens 0.24 Very loose
C_C3 0.75 High quality
C_lit 0.23 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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UBC 490 is a moderately populated, very loose object of high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate 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 rarely studied in the literature.

Relatively close Moderate extinction Near-solar metallicity Young

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 132 along with DBSB_39.

Palma et al. (2025)
Classified as optical pair P18, along with DBSB_39.

Almeida et al. (2025)
Mass determination: good 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 490 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–	140.569	-53.887	0.357	-4.388	4.063	5.218
Almeida et al.	2025	140.586	-53.866	–	–	–	–
Hunt & Reffert	2024	140.561	-53.898	0.361	-4.368	4.072	–
Cavallo et al.	2024	140.575	-53.888	0.362	–	–	–
Hunt & Reffert	2023	140.561	-53.898	0.361	-4.368	4.072	–
Dias et al.	2021	140.586	-53.866	0.329	-4.413	4.005	–
Cantat-Gaudin et al.	2020	140.563	-53.872	0.337	-4.397	4.029	–
Castro-Ginard et al.	2020	140.566	-53.843	0.335	-4.4	4.02	–

💡 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–	2.73	1.69	1.66	60	0.448	661	–	–
Liu et al.	2025	4.23	0.53	–	91	–	–	–	–
Almeida et al.	2025	2.72	1.76	–	95	–	827	–	–
Hunt & Reffert	2024	2.49	1.69	1.66	51	–	495⁽¹⁾	–	–
Cavallo et al.	2024	2.77	1.59	–	69	0.770	–	–	–
Hunt & Reffert	2023	2.49	1.69	1.66	51	–	–	–	–
Dias et al.	2021	2.72	1.76	–	95	0.126	–	–	–
Cantat-Gaudin et al.	2020	2.74	1.27	–	40	–	–	–	–
Kounkel et al.	2020	2.93	1.81	–	21	–	–	–	–

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

Visualization

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