Melotte 46

(Collinder 98; NGC 2243; MWSC 880; OCL 644; ESO 426 16; FSR 1296; FoF 3)

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) 1336

Stellar density (N₅₀/rad) 50.7 [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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Melotte 46 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, well below the mid-plane, affected by low extinction. It is catalogued as a massive, near-solar metallicity, old cluster, but with a large variance across recent sources for the absorption, age, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

Note: This object contains blue stragglers according to at least one source.

Distant Low extinction Massive Near-solar metallicity Old Contains BSS

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst fit.

Cavallo et al. (2024)
Gold sample.

Rain et al. (2024)
This cluster hosts only a few BSSs. Those offset from the ZAMS are consistent with binary evolution, with some appearing as evolved binaries, though not yet classified as YSSs.

Data

🔍 Search references for Melotte 46 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–	97.393	-31.283	0.227	-1.263	5.5	60.162
Li et al.	2025	97.395	-31.282	0.211	-1.279	5.488	–
Hu & Soubiran	2025	97.39	-31.281	–	–	–	–
Carrasco-Varela et al.	2025	97.539	-31.317	–	–	–	–
Almeida et al.	2025	97.392	-31.283	–	–	–	–
Hunt & Reffert	2024	97.396	-31.283	0.223	-1.267	5.494	59.993
Cavallo et al.	2024	97.39	-31.281	0.221	–	–	–
Rain et al.	2024	97.393	-31.284	0.222	-1.263	5.493	–
Hunt & Reffert	2023	97.396	-31.283	0.223	-1.267	5.494	59.993
Just et al.	2023	97.387	-31.284	–	–	–	–
Jaehnig et al.	2021	97.396	-31.284	0.241	-1.287	5.498	–
Rain et al.	2021	97.395	-31.282	0.211	-1.279	5.488	–
Dias et al.	2021	97.392	-31.283	0.217	-1.282	5.489	59.611
Cantat-Gaudin et al.	2020	97.395	-31.282	0.211	-1.279	5.488	–
Donor et al.	2020	97.392	-31.285	–	-1.28	5.5	59.8
Cantat-Gaudin & Anders	2020	97.395	-31.282	0.211	-1.279	5.488	–
Liu & Pang	2019	97.385	-31.279	0.257	-1.261	5.493	–
Soubiran et al.	2018	97.395	-31.282	–	–	–	59.63
Bica et al.	2019	97.397	-31.283	–	–	–	–
Cantat-Gaudin et al.	2018	97.395	-31.282	0.211	-1.279	5.488	–
Loktin & Popova	2017	97.395	-31.282	–	-0.49	4.02	55.0
Kharchenko et al.	2016	97.387	-31.284	–	–	–	–
Dias et al.	2014	97.392	-31.283	–	-0.48	4.02	–
Kharchenko et al.	2013	97.392	-31.285	–	-2.81	4.09	55.0
Gozha et al.	2012	97.392	-31.283	–	–	–	–
Kharchenko et al.	2007	97.39	-31.28	–	0.04	–	–
van den Bergh	2006	97.392	-31.283	–	–	–	–
Chen et al.	2003	97.449	-31.287	–	–	–	–
Dias et al.	2002	97.392	-31.283	–	-0.49	4.02	59.84

💡 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–	4.17	0.18	0.35	2056	-0.450	4401	0.16	0.06
Li et al.	2025	4.03	0.24	–	3136	-0.386	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.380⁽⁵⁾	–	–	–
Carrasco-Varela et al.	2025	4.00	0.27	–	3443	-0.450	–	–	0.06⁽¹⁾
Almeida et al.	2025	4.00	0.27	–	3443	–	3681	–	–
Hunt & Reffert	2024	–	–	–	–	–	5121⁽¹⁾	–	–
Cavallo et al.	2024	2.91	0.67	–	3890	-0.940	–	–	–
Rain et al.	2024	4.08	0.00	–	3426	–	9279	0.16	–
Hunt & Reffert	2023	3.95	0.03	0.35	2748	–	–	–	–
Just et al.	2023	–	–	–	1365	–	1832	–	–
Jaehnig et al.	2021	4.29⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	4.17	0.16	–	1072	–	–	–	14
Dias et al.	2021	4.00	0.27	–	3443	-0.482	–	–	–
Cantat-Gaudin et al.	2020	3.72	0.02	–	4365	–	–	–	–
Donor et al.	2020	–	–	–	–	-0.460	–	–	–
Cantat-Gaudin & Anders	2020	4.17	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	3390	0.000	–	–	–
Soubiran et al.	2018	4.17	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	4.17	–	–	–	–	–	–	–
Loktin & Popova	2017	4.88	0.18	–	1076	–	–	–	–
Kharchenko et al.	2016	4.45	0.19	–	1365	–	–	–	–
Kharchenko et al.	2013	4.45	0.19	–	1365	-0.490	–	–	–
Gozha et al.	2012	4.46	–	–	1076	-0.490	–	–	–
van den Bergh	2006	4.46	0.16	–	1072	–	–	–	–
Chen et al.	2003	4.46	0.16	–	1070	-0.440⁽¹⁾	–	–	–
Dias et al.	2002	4.46	0.16	–	1076	-0.420	–	–	–

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

Visualization

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