UBC 259

0.49 UTI

0.73

C_N

0.38

C_dens

1.0

C_C3

0.16

C_lit

1.0

C_dup

N_m (P>50%) 96

Core radius and density 2.4 [pc], 1.9 [pc^-2]

C3 classification AA

C_N 0.73 Moderately populated
C_dens 0.38 Loose
C_C3 1.0 Very high quality
C_lit 0.16 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 259 is a moderately populated, loose object of very high C3 quality. Its parallax locates it at a moderate 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 rarely studied in the literature.

Note: This object shares a moderate percentage of members with a later reported entry. See table with shared members information.

Relatively close Low extinction Near-solar metallicity Intermediate age

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 259 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–	157.623	-60.07	0.385	-5.458	2.872	10.465
Li et al.	2025	157.621	-60.078	0.377	-5.457	2.859	–
Hunt & Reffert	2024	157.64	-60.078	0.388	-5.458	2.873	9.3
Cavallo et al.	2024	157.786	-60.096	0.39	–	–	–
Hunt & Reffert	2023	157.64	-60.078	0.388	-5.458	2.873	9.3
Cantat-Gaudin et al.	2020	157.621	-60.078	0.377	-5.457	2.859	–
Castro-Ginard et al.	2020	157.606	-60.081	0.375	-5.453	2.853	–

💡 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–	2.33	0.575	0.98	125	-0.082	700	–	–
Li et al.	2025	2.54	0.54	–	213	0.257	–	–	–
Hunt & Reffert	2024	2.33	0.35	0.98	125	–	700⁽¹⁾	–	–
Cavallo et al.	2024	2.02	0.91	–	158	-0.420	–	–	–
Hunt & Reffert	2023	2.33	0.35	0.98	125	–	–	–	–
Cantat-Gaudin et al.	2020	2.38	0.61	–	102	–	–	–	–
Kounkel et al.	2020	2.20	0.71	–	93	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWWDL 5099	46.9	157.69	-60.05	0.38	-5.45	2.85	8.98	0.07

💡 Note: The % column shows the percentage of members that UBC 259 shares with each listed object.

Visualization

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