Melotte 44

(Collinder 88; NGC 2204; MWSC 822; OCL 572; ESO 556 07; FSR 1201; FoF 2)

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) 1095

Stellar density (N₅₀/rad) 12.3 [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 44 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, 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.

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

Distant Low extinction Massive Near-solar metallicity Old Contains BSS

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Melotte 44 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–	93.886	-18.671	0.204	-0.578	1.953	92.424
Li et al.	2025	93.882	-18.67	0.209	-0.56	1.964	–
Hu & Soubiran	2025	93.873	-18.673	–	–	–	–
Carrasco-Varela et al.	2025	94.057	-18.705	–	–	–	–
Almeida et al.	2025	93.882	-18.679	–	–	–	–
Hunt & Reffert	2024	93.885	-18.671	0.201	-0.579	1.957	93.888
Cavallo et al.	2024	93.873	-18.673	0.202	–	–	–
Hunt & Reffert	2023	93.885	-18.671	0.201	-0.579	1.957	93.888
Just et al.	2023	93.882	-18.659	–	–	–	–
Jaehnig et al.	2021	93.882	-18.665	0.238	-0.554	1.974	–
Rain et al.	2021	93.882	-18.67	0.209	-0.56	1.964	–
Dias et al.	2021	93.882	-18.679	0.212	-0.556	1.978	92.492
Cantat-Gaudin et al.	2020	93.882	-18.67	0.209	-0.56	1.964	–
Donor et al.	2020	93.888	-18.66	–	-0.58	1.95	91.9
Cantat-Gaudin & Anders	2020	93.882	-18.67	0.209	-0.56	1.964	–
Liu & Pang	2019	93.877	-18.691	0.252	-0.538	1.975	–
Soubiran et al.	2018	93.882	-18.67	–	–	–	92.42
Bica et al.	2019	93.902	-18.655	–	–	–	–
Cantat-Gaudin et al.	2018	93.882	-18.67	0.209	-0.56	1.964	–
Loktin & Popova	2017	93.885	-18.665	–	1.26	0.42	89.0
Kharchenko et al.	2016	93.882	-18.659	–	–	–	–
Dias et al.	2014	93.888	-18.665	–	1.26	0.42	–
Kharchenko et al.	2013	93.888	-18.66	–	0.5	3.36	89.0
Gozha et al.	2012	93.888	-18.665	–	–	–	–
Kharchenko et al.	2007	93.88	-18.67	–	0.08	–	–
van den Bergh	2006	93.787	-18.643	–	–	–	–
Chen et al.	2003	93.892	-18.659	–	–	–	–
Dias et al.	2002	93.888	-18.665	–	1.26	0.42	92.35

💡 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–	4.06	0.215	0.29	1950	-0.273	3699	–	0.05
Li et al.	2025	4.06	0.28	–	1976	-0.273	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.410⁽⁵⁾	–	–	–
Carrasco-Varela et al.	2025	4.11	0.18	–	2070	-0.150	–	–	0.05⁽¹⁾
Almeida et al.	2025	4.11	0.18	–	2070	–	3699	–	–
Hunt & Reffert	2024	–	–	–	–	–	5225⁽¹⁾	–	–
Cavallo et al.	2024	3.19	0.57	–	2291	-0.660	–	–	–
Hunt & Reffert	2023	4.55	0.05	0.29	1832	–	–	–	–
Just et al.	2023	–	–	–	1950	–	998	–	–
Jaehnig et al.	2021	4.23⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	4.20	0.25	–	776	–	–	–	7
Dias et al.	2021	4.11	0.18	–	2070	-0.175	–	–	–
Cantat-Gaudin et al.	2020	4.00	0.01	–	2089	–	–	–	–
Donor et al.	2020	–	–	–	–	-0.260	–	–	–
Cantat-Gaudin & Anders	2020	4.20	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	1380	0.250	–	–	–
Soubiran et al.	2018	4.20	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	4.20	–	–	–	–	–	–	–
Loktin & Popova	2017	2.81	0.32	–	851	–	–	–	–
Kharchenko et al.	2016	3.79	0.07	–	1950	–	–	–	–
Kharchenko et al.	2013	3.79	0.07	–	1950	-0.320	–	–	–
Gozha et al.	2012	2.63	–	–	787	-0.320	–	–	–
van den Bergh	2006	2.63	0.25	–	794	–	–	–	–
Chen et al.	2003	2.63	0.26	–	780	-0.330⁽¹⁾	–	–	–
Dias et al.	2002	2.63	0.26	–	787	-0.230	–	–	–

(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 0378	2.3	93.91	-18.72	0.26	-0.59	1.94	92.94	0.0

💡 Note: The % column shows the percentage of members that Melotte 44 shares with each listed object.

Visualization

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