Collinder 397

(NGC 6755; MWSC 3051; OCL 96)

0.97 UTI

0.83

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 315

Stellar density (N₅₀/rad) 43.5 [N/pc²]

C3 classification AA

C_N 0.83 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 397 is a rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, below 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 age 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 397 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–	286.941	4.227	0.4	-0.763	-3.554	26.506
Li et al.	2025	286.942	4.224	0.376	-0.734	-3.529	–
Almeida et al.	2025	286.937	4.215	–	–	–	–
Hunt & Reffert	2024	286.935	4.228	0.405	-0.766	-3.564	24.772
Cavallo et al.	2024	286.943	4.229	0.404	–	–	–
Hunt & Reffert	2023	286.935	4.228	0.405	-0.766	-3.564	24.772
Just et al.	2023	286.948	4.265	–	–	–	–
Jaehnig et al.	2021	286.943	4.236	0.417	-0.73	-3.547	–
Rain et al.	2021	286.942	4.224	0.376	-0.734	-3.529	–
Dias et al.	2021	286.937	4.215	0.377	-0.731	-3.525	28.456
Cantat-Gaudin et al.	2020	286.942	4.224	0.376	-0.734	-3.529	–
Sánchez et al.	2020	286.954	4.267	–	-0.831	-4.325	–
Cantat-Gaudin & Anders	2020	286.942	4.224	0.376	-0.734	-3.529	–
Soubiran et al.	2018	286.942	4.224	–	–	–	27.11
Bica et al.	2019	286.952	4.236	–	–	–	–
Cantat-Gaudin et al.	2018	286.942	4.224	0.376	-0.734	-3.529	–
Loktin & Popova	2017	286.95	4.267	–	-5.479	-6.498	18.7
Kharchenko et al.	2016	286.948	4.265	–	–	–	–
Dias et al.	2014	286.954	4.267	–	0.19	-3.16	–
Kharchenko et al.	2013	286.954	4.267	–	-5.45	-7.0	18.7
Gozha et al.	2012	286.954	4.267	–	–	–	–
Kharchenko et al.	2007	286.95	4.27	–	0.12	–	–
van den Bergh	2006	286.95	4.233	–	–	–	–
Chen et al.	2003	286.966	4.263	–	-1.7	-1.87	18.7
Dias et al.	2002	286.954	4.267	–	0.19	-3.16	26.63
Dambis	1999	286.954	4.267	–	–	–	–

💡 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–	2.0	2.54	1.16	100	0.068	1536	–	0.0
Li et al.	2025	1.95	2.37	–	378	0.056	–	–	–
Almeida et al.	2025	1.89	2.40	–	188	–	1536	–	–
Hunt & Reffert	2024	–	–	–	–	–	3019⁽¹⁾	–	–
Cavallo et al.	2024	2.00	2.56	–	195	0.080	–	–	–
Hunt & Reffert	2023	2.27	2.55	1.16	98	–	–	–	–
Just et al.	2023	–	–	–	100	–	578	–	–
Jaehnig et al.	2021	2.41⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	2.47	2.54	–	51	–	–	–	0
Dias et al.	2021	1.89	2.40	–	188	0.126	–	–	–
Cantat-Gaudin et al.	2020	2.64	2.34	–	145	–	–	–	–
Cantat-Gaudin & Anders	2020	2.47	–	–	–	–	–	–	–
Soubiran et al.	2018	2.47	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.47	–	–	–	–	–	–	–
Loktin & Popova	2017	1.45	2.54	–	56	–	–	–	–
Kharchenko et al.	2016	2.01	7.55	–	100	–	–	–	–
Kharchenko et al.	2013	2.01	7.55	–	100	–	–	–	–
Gozha et al.	2012	1.42	–	–	52	-0.030	–	–	–
van den Bergh	2006	1.42	2.57	–	52	–	–	–	–
Chen et al.	2003	1.42	–	–	50	–	–	–	–
Dias et al.	2002	1.42	2.56	–	52	–	–	–	–
Dambis	1999	1.89	2.34	–	126	–	–	–	–

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

Visualization

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