Collinder 398

(NGC 6756; MWSC 3052; OCL 99; FSR 0113)

0.97 UTI

0.87

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 424

Stellar density (N₅₀/rad) 145.8 [N/pc²]

C3 classification AA

C_N 0.87 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 398 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 high extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

Relatively close High extinction Massive Near-solar metallicity Intermediate age

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst fit.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Collinder 398 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–	287.181	4.71	0.307	-1.55	-3.662	48.759
Li et al.	2025	287.181	4.711	0.281	-1.584	-3.631	–
Almeida et al.	2025	287.184	4.711	–	–	–	–
Hunt & Reffert	2024	287.181	4.711	0.312	-1.546	-3.665	55.282
Cavallo et al.	2024	287.182	4.709	0.308	–	–	–
Hunt & Reffert	2023	287.181	4.711	0.312	-1.546	-3.665	55.282
Just et al.	2023	287.18	4.715	–	–	–	–
Dias et al.	2021	287.184	4.711	0.283	-1.586	-3.628	–
Cantat-Gaudin et al.	2020	287.181	4.711	0.281	-1.584	-3.631	–
Sánchez et al.	2020	287.175	4.705	–	-1.712	-3.695	–
Cantat-Gaudin & Anders	2020	287.181	4.711	0.281	-1.584	-3.631	–
Bica et al.	2019	287.166	4.712	–	–	–	–
Cantat-Gaudin et al.	2018	287.181	4.711	0.281	-1.584	-3.631	–
Loktin & Popova	2017	287.19	4.717	–	-5.33	-3.399	–
Kharchenko et al.	2016	287.18	4.715	–	–	–	–
Dias et al.	2014	287.175	4.705	–	-1.03	-3.43	–
Kharchenko et al.	2013	287.187	4.717	–	-4.68	-4.35	–
van den Bergh	2006	287.175	4.683	–	–	–	–
Dias et al.	2002	287.175	4.705	–	-1.03	-3.43	–

💡 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–	2.81	3.36	2.04	112	0.212	2380	–	–
Li et al.	2025	1.22	1.87	–	2667	0.049	–	–	–
Almeida et al.	2025	2.81	3.15	–	27	–	2380	–	–
Hunt & Reffert	2024	–	–	–	–	–	4519⁽¹⁾	–	–
Cavallo et al.	2024	3.09	3.41	–	162	0.610	–	–	–
Hunt & Reffert	2023	2.89	3.55	2.04	47	–	–	–	–
Just et al.	2023	–	–	–	251	–	219	–	–
Dias et al.	2021	2.81	3.15	–	27	0.324	–	–	–
Cantat-Gaudin et al.	2020	3.16	3.17	–	48	–	–	–	–
Cantat-Gaudin & Anders	2020	3.22	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	3.22	–	–	–	–	–	–	–
Loktin & Popova	2017	3.21	2.35	–	646	–	–	–	–
Kharchenko et al.	2016	1.95	3.36	–	251	–	–	–	–
Kharchenko et al.	2013	1.95	3.36	–	251	–	–	–	–
van den Bergh	2006	1.51	3.66	–	62	–	–	–	–
Dias et al.	2002	1.51	3.66	–	62	0.100	–	–	–

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

Visualization

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