UBC 1221

0.26 UTI

0.31

C_N

0.1

C_dens

0.75

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 31

Core radius and density 2.6 [pc], 0.5 [pc^-2]

C3 classification AB

C_N 0.31 Poorly populated
C_dens 0.1 Very loose
C_C3 0.75 High quality
C_lit 0.06 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 1221 is a poorly 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 metal-poor, young cluster (see Parameters). It is rarely studied in the literature.

Distant Moderate extinction Metal-poor Young

Palma et al. (2025)
Classified as optical pair P584, along with Theia_6066.

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 1221 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–	25.536	59.568	0.263	-1.804	-0.298	-100.219
Hunt & Reffert	2024	25.55	59.537	0.262	-1.805	-0.293	–
Cavallo et al.	2024	25.523	59.562	0.263	–	–	–
Hunt & Reffert	2023	25.55	59.537	0.262	-1.805	-0.293	–
Castro-Ginard et al.	2022	25.5	59.57	0.26	-1.8	-0.3	–

💡 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–	3.33	1.54	0.47	45	-0.610	445	–	–
Hunt & Reffert	2024	3.33	1.54	0.47	58	–	445⁽¹⁾	–	–
Cavallo et al.	2024	2.62	1.73	–	13	-0.610	–	–	–
Hunt & Reffert	2023	3.33	1.54	0.47	58	–	–	–	–
Castro-Ginard et al.	2022	3.84	1.35	–	32	–	–	–	–

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

Visualization

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