Collinder 7

(NGC 225; MWSC 68; OCL 305)

0.95 UTI

0.76

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 121

Stellar density (N₅₀/rad) 9.6 [N/pc²]

C3 classification AA

C_N 0.76 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 7 is a rich, very dense object of very high C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low extinction. It is catalogued as a 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.

Close Low extinction Near-solar metallicity Intermediate age

Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: good fit. Silver sample.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Collinder 7 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–	10.858	61.776	1.444	-5.34	-0.172	-11.742
Li et al.	2025	10.805	61.774	1.432	-5.373	-0.093	–
Almeida et al.	2025	10.777	61.778	–	–	–	–
Alfonso et al.	2024	10.688	61.833	1.413	-5.32	-0.206	–
Hunt & Reffert	2024	10.981	61.793	1.437	-5.361	-0.243	-11.634
Cavallo et al.	2024	9.819	61.926	1.44	–	–	–
Hunt & Reffert	2023	10.981	61.793	1.437	-5.361	-0.243	-11.634
Almeida et al.	2023	10.824	61.791	–	–	–	–
Just et al.	2023	10.789	61.779	–	–	–	–
He et al.	2022	10.82	61.795	1.453	-5.343	-0.195	–
Tarricq et al.	2022	10.746	61.773	1.428	-5.349	-0.246	–
Jaehnig et al.	2021	10.929	61.812	1.45	-5.329	-0.131	–
Rain et al.	2021	10.805	61.774	1.432	-5.373	-0.093	–
Dias et al.	2021	10.777	61.778	1.428	-5.4	-0.079	-1.478
Cantat-Gaudin et al.	2020	10.805	61.774	1.432	-5.373	-0.093	–
Cantat-Gaudin & Anders	2020	10.805	61.774	1.432	-5.373	-0.093	–
Bossini et al.	2019	10.805	61.774	–	–	–	–
Soubiran et al.	2018	10.805	61.774	–	–	–	-4.12
Bica et al.	2019	10.888	61.787	–	–	–	–
Cantat-Gaudin et al.	2018	10.805	61.774	1.432	-5.373	-0.093	–
Loktin & Popova	2017	10.92	61.775	–	-2.822	-2.387	-28.0
Kharchenko et al.	2016	10.789	61.779	–	–	–	–
Dias et al.	2014	10.912	61.775	–	-1.23	-0.06	–
Kharchenko et al.	2013	10.8	61.782	–	-3.09	-0.75	-28.0
Gozha et al.	2012	10.912	61.775	–	–	–	–
Kharchenko et al.	2012	10.8	61.782	–	-3.09	-0.75	-28.0
Piskunov et al.	2008	10.91	61.778	–	–	–	–
Kharchenko et al.	2007	10.92	61.78	–	0.2	–	-28.0
van den Bergh	2006	10.925	61.783	–	–	–	–
Kharchenko et al.	2005	10.92	61.78	–	-3.18	1.99	-28.0
Kharchenko et al.	2003	10.87	61.79	–	-2.9	1.32	–
Dias et al.	2002	10.912	61.775	–	-1.23	-0.06	-28.0

💡 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–	0.68	0.85	1.1	155	0.172	82	0.43	0.0
Li et al.	2025	0.64	0.85	–	127	0.044	–	–	–
Almeida et al.	2025	0.68	0.92	–	223	–	82	–	–
Alfonso et al.	2024	0.68	0.54	–	215	0.202	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	202⁽¹⁾	–	–
Cavallo et al.	2024	0.71	1.05	–	138	0.260	–	–	–
Hunt & Reffert	2023	0.66	0.77	1.10	93	–	–	–	–
Almeida et al.	2023	0.67	0.92	–	173	0.143	124⁽¹⁾	0.43	–
Just et al.	2023	–	–	–	155	–	14	–	–
He et al.	2022	–	1.10	–	79	–	–	–	–
Tarricq et al.	2022	0.67	–	–	295	–	–	–	–
Jaehnig et al.	2021	0.69⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	0.68	0.78	–	178	–	–	–	0
Dias et al.	2021	0.68	0.92	–	223	0.202	–	–	–
Cantat-Gaudin et al.	2020	0.68	0.54	–	288	–	–	–	–
Cantat-Gaudin & Anders	2020	0.68	–	–	–	–	–	–	–
Bossini et al.	2019	0.71	0.82	–	179	0.000	–	–	–
Soubiran et al.	2018	0.68	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	0.68	–	–	–	–	–	–	–
Loktin & Popova	2017	0.66	0.85	–	127	–	–	–	–
Kharchenko et al.	2016	0.85	1.86	–	155	–	–	–	–
Kharchenko et al.	2013	0.85	1.86	–	155	–	–	–	–
Gozha et al.	2012	0.66	–	–	130	–	62	–	–
Kharchenko et al.	2012	0.85	1.86	–	155	–	–	–	–
Piskunov et al.	2008	0.66	0.84	–	155	–	–	–	–
van den Bergh	2006	0.66	0.84	–	129	–	–	–	–
Kharchenko et al.	2005	0.66	0.84	–	155	–	–	–	–
Kharchenko et al.	2003	0.66	0.84	–	–	–	–	–	–
Dias et al.	2002	0.66	0.85	–	130	–	–	–	–

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

Visualization

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