Collinder 304

(NGC 6152; MWSC 2423; OCL 961; ESO 179 09)

0.96 UTI

0.81

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 267

Stellar density (N₅₀/rad) 24.6 [N/pc²]

C3 classification AA

C_N 0.81 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 304 is a rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by low extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the mass parameter (see Parameters). It is very well-studied in the literature.

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

Relatively close Low 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 304 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–	248.212	-52.637	0.609	-2.565	-4.99	-35.927
Li et al.	2025	248.213	-52.629	0.594	-2.511	-4.98	–
Almeida et al.	2025	248.216	-52.624	–	–	–	–
Hunt & Reffert	2024	248.158	-52.621	0.608	-2.581	-4.993	-34.365
Cavallo et al.	2024	248.222	-52.631	0.608	–	–	–
Hunt & Reffert	2023	248.158	-52.621	0.608	-2.581	-4.993	-34.365
Almeida et al.	2023	248.235	-52.621	–	–	–	–
Cordoni et al.	2023	248.216	-52.624	0.594	-2.519	-4.972	–
Just et al.	2023	248.163	-52.639	–	–	–	–
Rain et al.	2021	248.213	-52.629	0.594	-2.511	-4.98	–
Dias et al.	2021	248.216	-52.624	0.594	-2.519	-4.972	-35.513
Cantat-Gaudin et al.	2020	248.213	-52.629	0.594	-2.511	-4.98	–
Cantat-Gaudin & Anders	2020	248.213	-52.629	0.594	-2.511	-4.98	–
Monteiro & Dias	2019	248.213	-52.629	–	-2.536	-4.987	2.204
Bossini et al.	2019	248.213	-52.629	–	–	–	–
Soubiran et al.	2018	248.213	-52.629	–	–	–	-35.7
Bica et al.	2019	248.17	-52.645	–	–	–	–
Cantat-Gaudin et al.	2018	248.213	-52.629	0.594	-2.511	-4.98	–
Kharchenko et al.	2016	248.163	-52.639	–	–	–	–
Dias et al.	2014	248.188	-52.643	–	-1.81	-4.84	–
Kharchenko et al.	2013	248.175	-52.64	–	-2.0	-4.35	–
Piskunov et al.	2008	248.158	-52.638	–	–	–	–
Piskunov et al.	2007	248.158	-52.638	–	–	–	–
Kharchenko et al.	2005	248.17	-52.64	–	-2.06	-2.5	–
Kharchenko et al.	2003	248.17	-52.62	–	-1.85	-3.18	–
Dias et al.	2002	248.188	-52.643	–	-1.85	-4.87	–

💡 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–	1.42	0.97	0.85	288	0.131	1228	0.565	0.0
Li et al.	2025	1.47	0.72	–	472	0.243	–	–	–
Almeida et al.	2025	1.42	1.13	–	243	–	486	–	–
Hunt & Reffert	2024	–	–	–	–	–	1427⁽¹⁾	–	–
Cavallo et al.	2024	1.42	1.13	–	288	0.140	–	–	–
Hunt & Reffert	2023	1.54	1.01	0.85	155	–	–	–	–
Almeida et al.	2023	1.53	1.28	–	204	0.040	1228⁽¹⁾	0.57	–
Cordoni et al.	2023	1.42	1.13	–	243	0.131	3525	0.56	0.00
Just et al.	2023	–	–	–	427	–	86	–	–
Rain et al.	2021	1.61	0.62	–	447	–	–	–	0
Dias et al.	2021	1.42	1.13	–	243	0.131	–	–	–
Cantat-Gaudin et al.	2020	1.62	1.01	–	224	–	–	–	–
Cantat-Gaudin & Anders	2020	1.61	–	–	–	–	–	–	–
Monteiro & Dias	2019	1.54	1.19	–	271	0.022	–	–	–
Bossini et al.	2019	1.57	1.06	–	172	0.000	–	–	–
Soubiran et al.	2018	1.61	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.61	–	–	–	–	–	–	–
Kharchenko et al.	2016	1.03	0.61	–	427	–	–	–	–
Kharchenko et al.	2013	1.03	0.61	–	427	–	–	–	–
Piskunov et al.	2008	1.03	0.62	–	447	–	1250⁽¹⁾	–	–
Piskunov et al.	2007	1.03	0.62	–	447	–	367	–	–
Kharchenko et al.	2005	1.03	0.62	–	447	–	–	–	–
Kharchenko et al.	2003	1.03	0.93	–	–	–	–	–	–
Dias et al.	2002	1.03	0.93	–	–	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
OC 0654	13.1	248.25	-52.58	0.62	-2.56	-5.03	-35.18	0.0

💡 Note: The % column shows the percentage of members that Collinder 304 shares with each listed object.

Visualization

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