UBC 1227

0.20 UTI

0.3

C_N

0.09

C_dens

0.5

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 30

Core radius and density 3.0 [pc], 0.4 [pc^-2]

C3 classification BB

C_N 0.3 Poorly populated
C_dens 0.09 Very loose
C_C3 0.5 Intermediate 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 1227 is a poorly populated, very loose object of intermediate C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, young cluster (see Parameters). It is rarely studied in the literature.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Distant Moderate extinction Near-solar metallicity Young

Palma et al. (2025)
Classified as optical pair P578, along with Theia_3402.

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 1227 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–	29.728	63.241	0.284	-1.029	0.361	–
Hunt & Reffert	2024	29.724	63.242	0.285	-1.044	0.361	–
Cavallo et al.	2024	29.683	63.231	0.289	–	–	–
Hunt & Reffert	2023	29.724	63.242	0.285	-1.044	0.361	–
Castro-Ginard et al.	2022	29.69	63.24	0.29	-1.01	0.36	–

💡 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–	3.18	2.11	0.6	50	0.370	228	–	–
Hunt & Reffert	2024	3.18	2.18	0.60	50	–	228⁽¹⁾	–	–
Cavallo et al.	2024	2.84	2.04	–	91	0.370	–	–	–
Hunt & Reffert	2023	3.18	2.18	0.60	50	–	–	–	–
Castro-Ginard et al.	2022	3.27	1.85	–	27	–	–	–	–

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

Visualization

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