NGC 2309

(Melotte 56; Collinder 122; MWSC 1026; OCL 557; FSR 1148)

0.84 UTI

0.88

C_N

1.0

C_dens

0.75

C_C3

0.79

C_lit

1.0

C_dup

N₅₀ (P>50% members) 435

Stellar density (N₅₀/rad) 42.7 [N/pc²]

C3 classification AB

C_N 0.88 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.79 Well-studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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NGC 2309 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster (see Parameters). It is well-studied in the literature.

Relatively close Moderate 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.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.96 (50th percentile).

Data

🔍 Search references for NGC 2309 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–	104.021	-7.176	0.374	-0.53	-0.638	51.82
Li et al.	2025	104.02	-7.18	0.393	-0.495	-0.634	–
Almeida et al.	2025	104.019	-7.182	–	–	–	–
Hunt & Reffert	2024	104.021	-7.177	0.38	-0.527	-0.636	50.781
Cavallo et al.	2024	104.022	-7.182	0.379	–	–	–
Hunt & Reffert	2023	104.021	-7.177	0.38	-0.527	-0.636	50.781
Just et al.	2023	104.014	-7.174	–	–	–	–
Dias et al.	2021	104.019	-7.182	0.397	-0.496	-0.649	–
Cantat-Gaudin et al.	2020	104.02	-7.18	0.393	-0.495	-0.634	–
Cantat-Gaudin & Anders	2020	104.02	-7.18	0.393	-0.495	-0.634	–
Soubiran et al.	2018	104.02	-7.18	–	–	–	55.64
Bica et al.	2019	104.015	-7.168	–	–	–	–
Cantat-Gaudin et al.	2018	104.02	-7.18	0.393	-0.495	-0.634	–
Loktin & Popova	2017	104.01	-7.175	–	0.452	-0.536	–
Kharchenko et al.	2016	104.014	-7.174	–	–	–	–
Dias et al.	2014	104.013	-7.175	–	3.46	-4.53	–
Kharchenko et al.	2013	104.02	-7.175	–	1.58	-1.23	–
Bukowiecki et al.	2011	104.033	-7.178	–	–	–	–
van den Bergh	2006	104.05	-7.2	–	–	–	–
Dias et al.	2002	104.013	-7.175	–	3.46	-4.53	–
Lynga	1987	104.016	-7.191	–	–	–	–
Sulentic et al.	1973	104.003	-7.2	–	–	–	–

💡 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–	2.385	1.12	1.95	272	0.140	1462	–	–
Li et al.	2025	2.42	0.97	–	458	0.146	–	–	–
Almeida et al.	2025	2.08	1.33	–	220	–	1106	–	–
Hunt & Reffert	2024	–	–	–	–	–	1817⁽¹⁾	–	–
Cavallo et al.	2024	2.47	1.43	–	263	0.140	–	–	–
Hunt & Reffert	2023	2.39	1.23	1.95	198	–	–	–	–
Just et al.	2023	–	–	–	543	–	796	–	–
Dias et al.	2021	2.08	1.33	–	220	-0.111	–	–	–
Cantat-Gaudin et al.	2020	2.43	1.07	–	117	–	–	–	–
Kounkel et al.	2020	2.38	1.37	–	295	–	–	–	–
Cantat-Gaudin & Anders	2020	2.37	–	–	–	–	–	–	–
Soubiran et al.	2018	2.37	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.37	–	–	–	–	–	–	–
Loktin & Popova	2017	2.70	0.90	–	457	–	–	–	–
Kharchenko et al.	2016	2.38	1.12	–	543	–	–	–	–
Kharchenko et al.	2013	2.38	1.12	–	543	–	–	–	–
Bukowiecki et al.	2012	–	–	–	–	–	1905	–	–
Bukowiecki et al.	2011	2.88⁽¹⁾	1.17	–	282	–	–	–	–
van den Bergh	2006	2.51	1.10	–	251	–	–	–	–
Dias et al.	2002	2.51	1.10	–	251	–	–	–	–

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

Visualization

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