Melotte 177

(Collinder 342; VDBH 241; NGC 6400; MWSC 2660; OCL 1014; vdBergh-Hagen 241; ESO 393 14; FoF 715)

0.96 UTI

0.8

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 222

Stellar density (N₅₀/rad) 69.1 [N/pc²]

C3 classification AA

C_N 0.8 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 177 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 low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

Relatively close Low extinction 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.

Data

🔍 Search references for Melotte 177 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–	265.061	-36.953	0.795	0.495	-2.565	-13.658
Li et al.	2025	265.062	-36.957	0.797	0.499	-2.549	–
Wei et al.	2025	265.04	-36.932	0.796	0.43	-2.598	–
Almeida et al.	2025	265.065	-36.95	–	–	–	–
Hunt & Reffert	2024	265.053	-36.957	0.8	0.498	-2.589	-14.651
Cavallo et al.	2024	265.053	-36.951	0.801	–	–	–
Hunt & Reffert	2023	265.053	-36.957	0.8	0.498	-2.589	-14.651
Just et al.	2023	265.041	-36.946	–	–	–	–
Dias et al.	2021	265.065	-36.95	0.798	0.505	-2.533	–
Cantat-Gaudin et al.	2020	265.062	-36.957	0.797	0.499	-2.549	–
Cantat-Gaudin & Anders	2020	265.062	-36.957	0.797	0.499	-2.549	–
Liu & Pang	2019	265.066	-36.961	0.784	0.491	-2.548	–
Soubiran et al.	2018	265.062	-36.957	–	–	–	-13.06
Bica et al.	2019	265.041	-36.957	–	–	–	–
Cantat-Gaudin et al.	2018	265.062	-36.957	0.797	0.499	-2.549	–
Kharchenko et al.	2016	265.041	-36.946	–	–	–	–
Dias et al.	2014	265.05	-36.948	–	-1.13	-1.65	–
Kharchenko et al.	2013	265.05	-36.945	–	-1.04	-2.7	–
Piskunov et al.	2008	265.047	-36.949	–	–	–	–
Piskunov et al.	2007	265.047	-36.949	–	–	–	–
Kharchenko et al.	2005	265.05	-36.95	–	-0.94	-2.92	–
Kharchenko et al.	2003	265.05	-36.97	–	-1.68	-2.55	–
Dias et al.	2002	265.05	-36.948	–	-1.16	-1.73	–

💡 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–	1.12	0.77	1.67	528	-0.070	443	0.35	–
Li et al.	2025	0.97	1.18	–	520	-0.149	–	–	–
Wei et al.	2025	2.65	2.26	–	417	0.250	626	0.35	–
Almeida et al.	2025	1.13	1.46	–	250	–	544	–	–
Hunt & Reffert	2024	–	–	–	–	–	1140⁽¹⁾	–	–
Cavallo et al.	2024	1.11	1.78	–	155	-0.070	–	–	–
Hunt & Reffert	2023	1.18	1.42	1.67	154	–	–	–	–
Just et al.	2023	–	–	–	750	–	62	–	–
Tarricq et al.	2022	1.16	–	–	339	–	–	–	–
Dias et al.	2021	1.13	1.46	–	250	0.147	–	–	–
Cantat-Gaudin et al.	2020	1.20	0.93	–	302	–	–	–	–
Cantat-Gaudin & Anders	2020	1.21	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	537	-0.500	–	–	–
Soubiran et al.	2018	1.21	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.21	–	–	–	–	–	–	–
Kharchenko et al.	2016	0.94	0.61	–	750	–	–	–	–
Kharchenko et al.	2013	0.94	0.61	–	750	–	–	–	–
Piskunov et al.	2008	0.95	0.34	–	603	–	342⁽¹⁾	–	–
Piskunov et al.	2007	0.95	0.34	–	603	–	125	–	–
Kharchenko et al.	2005	0.95	0.34	–	603	–	–	–	–
Kharchenko et al.	2003	1.00	0.31	–	–	–	–	–	–
Dias et al.	2002	0.95	0.34	–	603	–	–	–	–

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

Visualization

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