Melotte 205

(Collinder 383; NGC 6645; MWSC 2946; OCL 48; FoF 68)

0.98 UTI

0.89

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 471

Stellar density (N₅₀/rad) 52.2 [N/pc²]

C3 classification AA

C_N 0.89 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 205 is a rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, below the mid-plane, affected by moderate extinction. It is catalogued as a massive, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the mass parameter (see Parameters). It is very well-studied in the literature.

Relatively close Moderate extinction Massive 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 Melotte 205 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–	278.149	-16.919	0.552	1.336	-0.636	-3.992
Li et al.	2025	278.158	-16.918	0.543	1.34	-0.633	–
Hu & Soubiran	2025	278.156	-16.916	–	–	–	–
Almeida et al.	2025	278.164	-16.915	–	–	–	–
Hunt & Reffert	2024	278.145	-16.926	0.547	1.33	-0.642	-5.583
Cavallo et al.	2024	278.156	-16.916	0.548	–	–	–
Hunt & Reffert	2023	278.145	-16.926	0.547	1.33	-0.642	-5.583
Just et al.	2023	278.122	-16.911	–	–	–	–
Dias et al.	2021	278.164	-16.915	0.545	1.343	-0.628	-4.94
Cantat-Gaudin et al.	2020	278.158	-16.918	0.543	1.34	-0.633	–
Cantat-Gaudin & Anders	2020	278.158	-16.918	0.543	1.34	-0.633	–
Liu & Pang	2019	278.144	-16.922	0.55	1.289	-0.616	–
Soubiran et al.	2018	278.158	-16.918	–	–	–	-3.93
Bica et al.	2019	278.145	-16.906	–	–	–	–
Cantat-Gaudin et al.	2018	278.158	-16.918	0.543	1.34	-0.633	–
Kharchenko et al.	2016	278.122	-16.911	–	–	–	–
Dias et al.	2014	278.154	-16.886	–	-2.24	-1.85	–
Kharchenko et al.	2013	278.13	-16.91	–	1.32	-2.48	–
Dias et al.	2002	278.154	-16.886	–	-2.36	-1.9	–

💡 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–	1.54	1.12	0.29	407	-0.140	1323	–	–
Li et al.	2025	1.55	1.12	–	588	0.050	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.140⁽⁵⁾	–	–	–
Almeida et al.	2025	1.53	1.41	–	390	–	1323	–	–
Hunt & Reffert	2024	–	–	–	–	–	3055⁽¹⁾	–	–
Cavallo et al.	2024	1.47	1.29	–	603	-0.150	–	–	–
Hunt & Reffert	2023	1.69	0.96	0.29	402	–	–	–	–
Just et al.	2023	–	–	–	407	–	69	–	–
Dias et al.	2021	1.53	1.41	–	390	0.097	–	–	–
Cantat-Gaudin et al.	2020	1.81	0.97	–	513	–	–	–	–
Cantat-Gaudin & Anders	2020	1.75	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	1150	-1.000	–	–	–
Soubiran et al.	2018	1.75	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.75	–	–	–	–	–	–	–
Kharchenko et al.	2016	1.25	1.12	–	407	–	–	–	–
Kharchenko et al.	2013	1.25	1.12	–	407	–	–	–	–
Dias et al.	2002	1.25	1.12	–	398	–	–	–	–

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

Visualization

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