UBC 255

0.55 UTI

0.67

C_N

0.43

C_dens

1.0

C_C3

0.32

C_lit

1.0

C_dup

N_m (P>50%) 84

Core radius and density 1.9 [pc], 2.1 [pc^-2]

C3 classification AA

C_N 0.67 Moderately populated
C_dens 0.43 Loose
C_C3 1.0 Very high quality
C_lit 0.32 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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UBC 255 is a moderately populated, loose object of very high C3 quality. Its parallax locates it at a close distance, below the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, old cluster, but with a large variance across recent sources for the absorption and metallicity parameters (see Parameters). It is poorly studied in the literature.

Note: This object contains blue stragglers according to at least one source.

Close Low extinction Near-solar metallicity Old Contains BSS

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.55 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.55 (50th percentile).

Data

🔍 Search references for UBC 255 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–	128.551	-61.478	1.063	-4.853	2.863	-11.901
Li et al.	2025	128.456	-61.463	1.049	-4.882	2.831	–
Hu & Soubiran	2025	128.579	-61.499	–	–	–	–
Alfonso et al.	2024	128.61	-61.466	1.031	-4.842	2.874	–
Hunt & Reffert	2024	128.553	-61.466	1.061	-4.878	2.892	-13.585
Cavallo et al.	2024	128.579	-61.499	1.062	–	–	–
Hunt & Reffert	2023	128.553	-61.466	1.061	-4.878	2.892	-13.585
He et al.	2022	128.529	-61.462	1.058	-4.832	2.891	–
Tarricq et al.	2022	128.54	-61.44	1.067	-4.852	2.863	–
Jadhav & Subramaniam	2021	128.456	-61.463	–	–	–	–
Cantat-Gaudin et al.	2020	128.456	-61.463	1.049	-4.882	2.831	–
Castro-Ginard et al.	2020	128.471	-61.465	1.047	-4.868	2.82	–

💡 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–	0.89	0.42	0.85	2054	-0.104	150	–	1
Li et al.	2025	0.95	0.67	–	2113	-0.232	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.220⁽⁵⁾	–	–	–
Alfonso et al.	2024	0.89	0.00	–	2421	0.011	–	–	–
Hunt & Reffert	2024	0.91	0.42	0.85	974	–	97⁽¹⁾	–	–
Cavallo et al.	2024	0.91	0.65	–	1549	0.240	–	–	–
Hunt & Reffert	2023	0.91	0.42	0.85	975	–	–	–	–
He et al.	2022	–	0.55	–	1995	–	–	–	–
Tarricq et al.	2022	0.87	–	–	2512	–	–	–	–
Jadhav & Subramaniam	2021	0.89	0.00	–	2399	–	202	–	1⁽¹⁾
Cantat-Gaudin et al.	2020	0.89	0.00	–	2399	–	–	–	–
Kounkel et al.	2020	0.84	0.94	–	692	–	–	–	–

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

Visualization

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