UBC 444

0.60 UTI

0.68

C_N

0.47

C_dens

0.75

C_C3

0.54

C_lit

1.0

C_dup

N_m (P>50%) 87

Core radius and density 2.0 [pc], 2.4 [pc^-2]

C3 classification AB

C_N 0.68 Moderately populated
C_dens 0.47 Loose
C_C3 0.75 High quality
C_lit 0.54 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UBC 444 is a moderately populated, loose object of high C3 quality. Its parallax locates it at a relatively close distance, near 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 age parameter (see Parameters). It is moderately studied in the literature.

Relatively close Low extinction Near-solar metallicity Intermediate age

Li et al. (2026)
Tidal & Core radii: r_t=125+/-78.2 [pc], r_c=0.32+/-0.0 [pc]; stars within r_t: N~64

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 39 along with CMa_2.

Palma et al. (2025)
Part of multiple system G11, along with Theia_2649, CMa_2 and ASCC_30.

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 444 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–	105.308	-6.837	0.904	-1.468	-2.444	18.532
Li et al.	2026	105.31	-6.86	–	–	–	–
Li et al.	2025	105.311	-6.837	0.915	-1.506	-2.49	–
Hunt & Reffert	2024	105.305	-6.852	0.887	-1.474	-2.443	19.153
Cavallo et al.	2024	105.317	-6.848	0.889	–	–	–
Hunt & Reffert	2023	105.305	-6.852	0.887	-1.474	-2.443	19.153
He et al.	2022	105.326	-6.848	0.897	-1.489	-2.441	–
Tarricq et al.	2022	105.314	-6.839	0.917	-1.488	-2.447	–
Jadhav & Subramaniam	2021	105.311	-6.837	–	–	–	–
Cantat-Gaudin et al.	2020	105.311	-6.837	0.915	-1.506	-2.49	–
Castro-Ginard et al.	2020	105.31	-6.828	0.913	-1.505	-2.492	–

💡 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–	1.07	0.34	0.82	449	0.105	164	–	0
Liu et al.	2025	1.53	0.25	–	251	–	–	–	–
Li et al.	2025	1.07	0.56	–	436	0.040	–	–	–
Hunt & Reffert	2024	1.04	0.34	0.82	463	–	221⁽¹⁾	–	–
Cavallo et al.	2024	1.08	0.49	–	309	0.170	–	–	–
Hunt & Reffert	2023	1.04	0.34	0.82	462	–	–	–	–
He et al.	2022	–	0.80	–	56	–	–	–	–
Tarricq et al.	2022	1.06	–	–	501	–	–	–	–
Jadhav & Subramaniam	2021	1.09	0.30	–	490	–	106	–	0⁽¹⁾
Cantat-Gaudin et al.	2020	1.09	0.30	–	490	–	–	–	–
Kounkel et al.	2020	1.00	0.72	–	200	–	–	–	–

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

Visualization

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