Collinder 291

(VDBH 172; NGC 5925; MWSC 2293; OCL 938; vdBergh-Hagen 172; ESO 177 06; FoF 1611)

1.0 UTI

1.0

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 568

Stellar density (N₅₀/rad) 47.0 [N/pc²]

C3 classification AA

C_N 1.0 Very rich
C_dens 1.0 Very dense
C_C3 1.0 Very high quality
C_lit 1.0 Very well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Collinder 291 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, above the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity and mass parameters (see Parameters). It is very well-studied in the literature.

Relatively close Moderate extinction Massive Near-solar metallicity Intermediate age

Almeida et al. (2025)
Mass determination: good fit. Isochrone match: good fit. Gold sample.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Collinder 291 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–	231.846	-54.521	0.686	-4.348	-5.119	-20.011
Li et al.	2025	231.847	-54.515	0.679	-4.319	-5.142	–
Hu & Soubiran	2025	231.861	-54.512	–	–	–	–
Wei et al.	2025	231.842	-54.52	0.689	-4.363	-5.12	–
Almeida et al.	2025	231.835	-54.507	–	–	–	–
Hunt & Reffert	2024	231.836	-54.518	0.688	-4.351	-5.116	-23.138
Cavallo et al.	2024	231.861	-54.512	0.689	–	–	–
Hunt & Reffert	2023	231.836	-54.518	0.688	-4.351	-5.116	-23.138
Just et al.	2023	231.881	-54.516	–	–	–	–
Tarricq et al.	2022	231.822	-54.553	0.688	-4.358	-5.111	–
Dias et al.	2021	231.835	-54.507	0.679	-4.32	-5.145	-37.37
Cantat-Gaudin et al.	2020	231.847	-54.515	0.679	-4.319	-5.142	–
Cantat-Gaudin & Anders	2020	231.847	-54.515	0.679	-4.319	-5.142	–
Liu & Pang	2019	231.858	-54.514	0.684	-4.326	-5.152	–
Soubiran et al.	2018	231.847	-54.515	–	–	–	-20.62
Bica et al.	2019	231.91	-54.557	–	–	–	–
Cantat-Gaudin et al.	2018	231.847	-54.515	0.679	-4.319	-5.142	–
Kharchenko et al.	2016	231.881	-54.516	–	–	–	–
Dias et al.	2014	231.858	-54.528	–	-1.86	-3.8	–
Kharchenko et al.	2013	231.892	-54.517	–	0.48	-3.72	–
Dias et al.	2002	231.858	-54.528	–	-1.86	-3.8	–

💡 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–	1.41	1.49	1.04	494	0.250	1463	0.52	–
Li et al.	2025	1.45	1.48	–	482	0.349	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.150⁽⁵⁾	–	–	–
Wei et al.	2025	2.19	1.50	–	576	0.250	1397	0.52	–
Almeida et al.	2025	1.24	1.61	–	494	–	1529	–	–
Hunt & Reffert	2024	–	–	–	–	–	2050⁽¹⁾	–	–
Cavallo et al.	2024	1.36	1.44	–	550	0.400	–	–	–
Hunt & Reffert	2023	1.35	1.46	1.04	310	–	–	–	–
Just et al.	2023	–	–	–	178	–	87	–	–
Tarricq et al.	2022	1.36	–	–	525	–	–	–	–
Dias et al.	2021	1.24	1.61	–	494	0.137	–	–	–
Cantat-Gaudin et al.	2020	1.41	1.34	–	490	–	–	–	–
Cantat-Gaudin & Anders	2020	1.41	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	562	0.250	–	–	–
Soubiran et al.	2018	1.41	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.41	–	–	–	–	–	–	–
Kharchenko et al.	2016	1.55	2.33	–	178	–	–	–	–
Kharchenko et al.	2013	1.55	2.33	–	178	–	–	–	–
Dias et al.	2002	1.17	0.19	–	1585	–	–	–	–

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

Visualization

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