UBC 284

0.74 UTI

0.83

C_N

1.0

C_dens

1.0

C_C3

0.44

C_lit

1.0

C_dup

C3 classification AA

Number of members (P>50%) 309

Radius (P>50% members) 4.9 [arcmin]

C_N 0.83 Rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 0.44 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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UBC 284 is a rich, very dense object of very 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 massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is poorly studied in the literature.

Relatively close Low extinction Massive Near-solar metallicity Old

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for UBC 284 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	–	184.276	-62.955	0.531	-7.184	-1.331	-38.246
Li et al.	2025	184.283	-62.952	0.504	-7.19	-1.335	–
Hu & Soubiran	2025	184.253	-62.956	–	–	–	–
Hunt & Reffert	2024	184.29	-62.953	0.53	-7.183	-1.322	-33.748
Cavallo et al.	2024	184.253	-62.957	0.531	–	–	–
Hunt & Reffert	2023	184.29	-62.953	0.53	-7.183	-1.322	-33.748
Cantat-Gaudin et al.	2020	184.283	-62.952	0.504	-7.19	-1.335	–
Castro-Ginard et al.	2020	184.263	-62.95	0.505	-7.179	-1.335	–

💡 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]	Bfr	BSS
Li et al.	2025	1.76	1.14	–	1482	-0.159	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.310*	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	1781*	–	–
Cavallo et al.	2024	1.72	0.93	–	1585	0.200	–	–	–
Hunt & Reffert	2023	1.79	0.87	0.24	1422	–	–	–	–
Cantat-Gaudin et al.	2020	1.86	0.94	–	1585	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Visualization

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