UBC 1231

0.33 UTI

0.33

C_N

0.65

C_dens

0.5

C_C3

0.1

C_lit

1.0

C_dup

N₅₀ (P>50% members) 33

Stellar density (N₅₀/rad) 3.2 [N/pc²]

C3 classification BB

C_N 0.33 Poorly populated
C_dens 0.65 Moderately dense
C_C3 0.5 Intermediate quality
C_lit 0.1 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 1231 is a poorly populated, moderately dense object of intermediate 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, intermediate-age 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 Intermediate age

Palma et al. (2025)
Classified as optical pair P344, along with CWNU_2238.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.98 (50th percentile).

Data

🔍 Search references for UBC 1231 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–	29.091	59.087	0.446	-0.75	0.24	–
Zhang et al.	2024	29.097	59.071	–	–	–	–
Hunt & Reffert	2024	29.097	59.071	0.436	-0.737	0.247	–
Cavallo et al.	2024	29.096	59.088	0.436	–	–	–
Hunt & Reffert	2023	29.097	59.071	0.436	-0.737	0.247	–
Castro-Ginard et al.	2022	29.06	59.1	0.45	-0.76	0.23	–

💡 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–	2.16	1.26	1.07	299	0.058	255	–	–
Zhang et al.	2024	–	–	–	–	-0.174⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	255⁽¹⁾	–	–
Cavallo et al.	2024	2.16	1.38	–	490	0.290	–	–	–
Hunt & Reffert	2023	2.12	1.26	1.07	299	–	–	–	–
Castro-Ginard et al.	2022	2.33	1.02	–	242	–	–	–	–

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

Visualization

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