NGC 6231

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) 1024

Stellar density (N₅₀/rad) 141.1 [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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NGC 6231 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, near the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, very young cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is very well-studied in the literature.

Note: This object shares a very small percentage of members with 2 later reported entries. See table with shared members information.

Relatively close Moderate extinction Massive Near-solar metallicity Very young

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for NGC 6231 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–	253.556	-41.828	0.605	-0.576	-2.179	-27.671
Wei et al.	2025	253.545	-41.745	0.604	-0.588	-2.091	–
Almeida et al.	2025	253.535	-41.801	–	–	–	–
Hunt & Reffert	2024	253.571	-41.836	0.608	-0.576	-2.184	-30.795
Celli et al.	2024	253.545	-41.812	–	–	–	–
Cavallo et al.	2024	253.56	-41.828	0.607	–	–	–
Hunt & Reffert	2023	253.571	-41.836	0.608	-0.576	-2.184	-30.795
Jaehnig et al.	2021	253.544	-41.803	0.621	-0.578	-2.096	–
Rain et al.	2021	253.545	-41.812	0.589	-0.529	-2.177	–
Dias et al.	2021	253.535	-41.801	0.598	-0.533	-2.162	-28.186
Cantat-Gaudin et al.	2020	253.545	-41.812	0.589	-0.529	-2.177	–
Cantat-Gaudin & Anders	2020	253.545	-41.812	0.589	-0.529	-2.177	–
Dias et al.	2019	253.542	-41.825	0.591	-0.569	-2.164	-28.47
Soubiran et al.	2018	253.545	-41.812	–	–	–	-39.88
Cantat-Gaudin et al.	2018	253.545	-41.812	0.589	-0.529	-2.177	–
Loktin & Popova	2017	253.545	-41.825	–	-0.707	-0.283	-28.5
Dias et al.	2014	253.542	-41.825	–	-0.89	-1.79	–
Gozha et al.	2012	253.542	-41.825	–	–	–	–
Piskunov et al.	2008	253.542	-41.831	–	–	–	–
Kharchenko et al.	2007	253.54	-41.83	–	0.22	–	-27.28
van den Bergh	2006	253.535	-41.827	–	–	–	–
Kharchenko et al.	2005	253.56	-41.83	–	-0.39	-1.99	-27.28
Kharchenko et al.	2003	253.56	-41.83	–	-1.45	-0.96	–
Chen et al.	2003	253.555	-41.787	–	-0.34	-2.32	-25.0
Dias et al.	2002	253.542	-41.825	–	-0.89	-1.79	-27.54
Dambis	1999	253.535	-41.827	–	–	–	–

💡 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	1.36	1.69	7	0.110	3199	0.55	0.0
Wei et al.	2025	2.63	1.80	–	9	0.500	7185	0.55	–
Almeida et al.	2025	1.43	1.53	–	9	–	3080	–	–
Hunt & Reffert	2024	–	–	–	–	–	4210⁽¹⁾	–	–
Celli et al.	2024	–	–	–	14	–	3199	–	–
Cavallo et al.	2024	1.31	1.48	–	9	0.050	–	–	–
Hunt & Reffert	2023	1.56	1.53	1.69	4	–	–	–	–
Jaehnig et al.	2021	1.64⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	1.62	1.33	–	7	–	–	–	0
Dias et al.	2021	1.43	1.53	–	9	0.110	–	–	–
Cantat-Gaudin et al.	2020	1.47	1.07	–	14	–	–	–	–
Cantat-Gaudin & Anders	2020	1.62	–	–	–	–	–	–	–
Dias et al.	2019	0.99	1.55	–	12	-1.623	–	–	–
Soubiran et al.	2018	1.62	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.62	–	–	–	–	–	–	–
Loktin & Popova	2017	1.25	1.35	–	7	–	–	–	–
Gozha et al.	2012	1.24	–	–	7	0.260	661	–	–
Piskunov et al.	2008	1.25	1.36	–	6	–	–	–	–
van den Bergh	2006	1.24	1.36	–	7	–	–	–	–
Kharchenko et al.	2005	1.25	1.36	–	6	–	–	–	–
Kharchenko et al.	2003	1.24	1.36	–	–	–	–	–	–
Chen et al.	2003	1.24	–	–	0	–	–	–	–
Dias et al.	2002	1.24	1.36	–	7	–	–	–	–
Dambis	1999	1.41	1.45	–	3	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 672	1.3	253.28	-41.61	0.57	-0.64	-2.02	-26.66	0.1
CWWDL 14193	0.4	253.36	-41.47	0.63	-0.66	-1.94	-15.26	0.16

💡 Note: The % column shows the percentage of members that NGC 6231 shares with each listed object.

Visualization

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