Collinder 305

(VDBH 192; NGC 6167; MWSC 2425; Harvard 11; OCL 971; vdBergh-Hagen 192; ESO 226 16)

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) 1019

Stellar density (N₅₀/rad) 109.0 [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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Collinder 305 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 very massive, metal-rich, young 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.

Note: This object shares a very small percentage of members with 5 later reported entries. See table with shared members information.

Relatively close Moderate extinction Very massive Metal-rich Young

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Collinder 305 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–	248.672	-49.759	0.675	-0.684	-2.831	-19.482
Wei et al.	2025	248.686	-49.732	0.677	-0.747	-2.826	–
Hunt & Reffert	2024	248.673	-49.784	0.677	-0.741	-2.806	-9.656
Cavallo et al.	2024	248.684	-49.772	0.677	–	–	–
Hunt & Reffert	2023	248.673	-49.784	0.677	-0.741	-2.806	-9.656
Just et al.	2023	248.658	-49.785	–	–	–	–
Jaehnig et al.	2021	248.681	-49.761	0.683	-0.69	-2.786	–
Rain et al.	2021	248.662	-49.759	0.653	-0.616	-2.854	–
Cantat-Gaudin et al.	2020	248.662	-49.759	0.653	-0.616	-2.854	–
Cantat-Gaudin & Anders	2020	248.662	-49.759	0.653	-0.616	-2.854	–
Soubiran et al.	2018	248.662	-49.759	–	–	–	-19.18
Bica et al.	2019	248.631	-49.768	–	–	–	–
Cantat-Gaudin et al.	2018	248.662	-49.759	0.653	-0.616	-2.854	–
Loktin & Popova	2017	248.67	-49.785	–	-2.862	-4.779	-34.4
Kharchenko et al.	2016	248.658	-49.785	–	–	–	–
Dias et al.	2014	248.642	-49.772	–	-0.97	-1.62	–
Kharchenko et al.	2013	248.67	-49.785	–	-2.09	-3.95	-34.4
Gozha et al.	2012	248.642	-49.772	–	–	–	–
Piskunov et al.	2008	248.631	-49.769	–	–	–	–
Kharchenko et al.	2007	248.64	-49.77	–	0.17	–	-34.7
van den Bergh	2006	248.65	-49.767	–	–	–	–
Kharchenko et al.	2005	248.64	-49.77	–	0.8	-4.4	-34.7
Kharchenko et al.	2003	248.67	-49.56	–	-1.35	-2.84	–
Dias et al.	2002	248.642	-49.772	–	-0.83	-4.52	-21.32
Dambis	1999	248.642	-49.772	–	–	–	–

💡 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–	1.22	2.435	2.84	78	0.540	6251	0.33	0.0
Wei et al.	2025	0.63	0.97	–	40	0.500	12122	0.33	–
Hunt & Reffert	2024	–	–	–	–	–	16818⁽¹⁾	–	–
Cavallo et al.	2024	1.59	3.07	–	56	0.580	–	–	–
Hunt & Reffert	2023	1.40	2.89	2.84	25	–	–	–	–
Just et al.	2023	–	–	–	155	–	211	–	–
Tarricq et al.	2022	1.29	–	–	170	–	–	–	–
Jaehnig et al.	2021	1.47⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	1.47	2.39	–	76	–	–	–	0
Cantat-Gaudin et al.	2020	1.34	1.88	–	155	–	–	–	–
Cantat-Gaudin & Anders	2020	1.47	–	–	–	–	–	–	–
Soubiran et al.	2018	1.47	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.47	–	–	–	–	–	–	–
Loktin & Popova	2017	1.11	2.42	–	78	–	–	–	–
Kharchenko et al.	2016	1.22	2.65	–	155	–	–	–	–
Kharchenko et al.	2013	1.22	2.65	–	155	–	–	–	–
Gozha et al.	2012	1.11	–	–	77	–	380	–	–
Piskunov et al.	2008	1.11	2.45	–	145	–	–	–	–
van den Bergh	2006	1.11	2.42	–	78	–	–	–	–
Kharchenko et al.	2005	1.11	2.45	–	145	–	–	–	–
Kharchenko et al.	2003	1.11	1.86	–	–	–	–	–	–
Dias et al.	2002	1.11	2.41	–	77	–	–	–	–
Dambis	1999	0.95	3.06	–	79	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
CWNU 1219	2.6	248.62	-49.81	0.75	-0.77	-2.82	-19.72	0.12
OC 0661	2.1	248.69	-49.78	0.72	-0.91	-2.74	-24.32	0.06
OC 0658	1.3	248.36	-49.83	0.67	-0.8	-2.77	-41.03	0.06
OC 0660	0.5	248.98	-50.3	0.67	-0.76	-2.89	-24.4	0.14
OC 0659	0.3	248.72	-50.18	0.66	-0.93	-2.75	-41.3	0.27

💡 Note: The % column shows the percentage of members that Collinder 305 shares with each listed object.

Visualization

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