Collinder 340

(VDBH 240; NGC 6404; MWSC 2658; OCL 1024; vdBergh-Hagen 240; ESO 393 13)

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) 716

Stellar density (N₅₀/rad) 52.5 [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

ℹ️

Collinder 340 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, near 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.

Note: This object shares a large percentage of members with a later reported entry. See table with shared members information.

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 340 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	264.915	-33.225	0.354	0.144	-0.744	9.755
Almeida et al.	2025	264.92	-33.222	–	–	–	–
Hunt & Reffert	2024	264.911	-33.229	0.361	0.148	-0.746	59.446
Cavallo et al.	2024	264.912	-33.22	0.361	–	–	–
Hunt & Reffert	2023	264.911	-33.229	0.361	0.148	-0.746	59.446
Just et al.	2023	264.906	-33.234	–	–	–	–
Jaehnig et al.	2021	264.914	-33.224	0.388	0.173	-0.697	–
Rain et al.	2021	264.916	-33.224	0.355	0.194	-0.705	–
Dias et al.	2021	264.92	-33.222	0.357	0.198	-0.698	9.38
Cantat-Gaudin et al.	2020	264.916	-33.224	0.355	0.194	-0.705	–
Cantat-Gaudin & Anders	2020	264.916	-33.224	0.355	0.194	-0.705	–
Soubiran et al.	2018	264.916	-33.224	–	–	–	9.91
Bica et al.	2019	264.898	-33.242	–	–	–	–
Cantat-Gaudin et al.	2018	264.916	-33.224	0.355	0.194	-0.705	–
Kharchenko et al.	2016	264.906	-33.234	–	–	–	–
Dias et al.	2014	264.904	-33.247	–	-1.01	-0.59	–
Kharchenko et al.	2013	264.915	-33.233	–	6.3	-3.37	10.6
Gozha et al.	2012	264.904	-33.247	–	–	–	–
Dias et al.	2002	264.904	-33.247	–	-7.73	-5.0	10.6

💡 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–	2.59	3.47	2.01	501	0.110	3447	–	0.0
Almeida et al.	2025	2.77	3.65	–	6	–	3447	–	–
Hunt & Reffert	2024	–	–	–	–	–	5852⁽¹⁾	–	–
Cavallo et al.	2024	1.30	4.60	–	302	-0.830	–	–	–
Hunt & Reffert	2023	2.64	4.39	2.01	34	–	–	–	–
Just et al.	2023	–	–	–	562	–	303	–	–
Jaehnig et al.	2021	2.58⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	2.60	2.85	–	501	–	–	–	0
Dias et al.	2021	2.77	3.65	–	6	0.285	–	–	–
Cantat-Gaudin et al.	2020	2.50	3.47	–	100	–	–	–	–
Cantat-Gaudin & Anders	2020	2.60	–	–	–	–	–	–	–
Soubiran et al.	2018	2.60	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.60	–	–	–	–	–	–	–
Kharchenko et al.	2016	2.15	3.29	–	562	–	–	–	–
Kharchenko et al.	2013	2.15	3.29	–	562	0.110	–	–	–
Gozha et al.	2012	1.70	–	–	501	0.110	–	–	–
Dias et al.	2002	2.40	2.85	–	501	0.110	–	–	–

(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 567	80.2	264.92	-33.22	0.35	0.14	-0.74	9.75	0.0

💡 Note: The % column shows the percentage of members that Collinder 340 shares with each listed object.

Visualization

ℹ️

1 2 3