Melotte 201

(Collinder 380; NGC 6633; MWSC 2917; OCL 90; FoF 2425; OCSN 241)

0.97 UTI

0.87

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 423

Stellar density (N₅₀/rad) 48.8 [N/pc²]

C3 classification AA

C_N 0.87 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 201 is a rich, very dense object of very high C3 quality. Its parallax locates it at a very close distance, above 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.

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.

Very close Low extinction Near-solar metallicity Intermediate age Contains BSS

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 201 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–	276.841	6.61	2.538	1.226	-1.824	-28.452
Nizovkina et al.	2025	276.805	6.559	–	–	–	–
Li et al.	2025	276.845	6.615	2.525	1.198	-1.811	–
Wei et al.	2025	276.821	6.619	2.536	1.216	-1.824	–
Almeida et al.	2025	276.865	6.611	–	–	–	–
Alfonso et al.	2024	276.841	6.641	2.506	1.227	-1.824	–
Zhang et al.	2024	276.805	6.559	–	–	–	–
Hunt & Reffert	2024	276.805	6.559	2.54	1.204	-1.804	-27.901
Cavallo et al.	2024	276.853	6.647	2.538	–	–	–
Hunt & Reffert	2023	276.805	6.559	2.54	1.204	-1.804	-27.901
Almeida et al.	2023	276.865	6.641	–	–	–	–
Qin et al.	2023	276.85	6.65	2.54	1.24	-1.81	-28.49
Just et al.	2023	276.829	6.499	–	–	–	–
He et al.	2022	276.846	6.607	2.539	1.224	-1.808	–
Tarricq et al.	2022	276.791	6.786	2.545	1.237	-1.813	–
Jaehnig et al.	2021	276.861	6.611	2.551	1.202	-1.808	–
Rain et al.	2021	276.845	6.615	2.525	1.198	-1.811	–
Dias et al.	2021	276.865	6.611	2.518	1.195	-1.795	-28.195
Cantat-Gaudin et al.	2020	276.845	6.615	2.525	1.198	-1.811	–
Cantat-Gaudin & Anders	2020	276.845	6.615	2.525	1.198	-1.811	–
Liu & Pang	2019	276.876	6.629	2.514	1.2	-1.775	–
Bossini et al.	2019	276.845	6.615	–	–	–	–
Soubiran et al.	2018	276.845	6.615	–	–	–	-28.62
Bica et al.	2019	276.935	6.556	–	–	–	–
Cantat-Gaudin et al.	2018	276.845	6.615	2.525	1.198	-1.811	–
Loktin & Popova	2017	276.81	6.508	–	-3.982	-5.701	-25.4
Kharchenko et al.	2016	276.829	6.499	–	–	–	–
Dias et al.	2014	276.813	6.508	–	-2.27	-4.95	–
Kharchenko et al.	2013	276.835	6.5	–	-0.3	-2.65	-25.4
Gozha et al.	2012	276.812	6.508	–	–	–	–
Piskunov et al.	2008	276.801	6.513	–	–	–	–
Kharchenko et al.	2007	276.81	6.51	–	0.51	–	-25.43
Piskunov et al.	2007	276.801	6.513	–	–	–	–
van den Bergh	2006	276.88	6.57	–	–	–	–
Kharchenko et al.	2005	276.81	6.51	–	0.1	-2.0	-25.43
Kharchenko et al.	2003	276.87	6.54	–	-0.16	-2.51	–
Chen et al.	2003	276.877	6.574	–	-0.01	-0.51	-29.1
Dias et al.	2002	276.812	6.508	–	-2.27	-4.95	-28.95

💡 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–	0.39	0.56	0.96	575	-0.026	196	0.58	1.0
Nizovkina et al.	2025	0.35⁽⁴⁾	0.52⁽⁴⁾	–	791⁽⁴⁾	-0.168⁽⁴⁾	–	–	–
Li et al.	2025	0.38	0.54	–	759	-0.052	–	–	–
Wei et al.	2025	0.50	0.68	–	417	0.250	653	0.45	–
Almeida et al.	2025	0.39	0.77	–	607	–	265	–	–
Alfonso et al.	2024	0.42	0.30	–	1142	-0.092	–	–	–
Zhang et al.	2024	–	–	–	–	-0.148⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	574⁽¹⁾	–	–
Cavallo et al.	2024	0.39	0.84	–	331	0.130	–	–	–
Hunt & Reffert	2023	0.37	0.39	0.96	472	–	–	–	–
Almeida et al.	2023	0.39	0.55	–	796	-0.117	512⁽¹⁾	0.71	–
Qin et al.	2023	0.48	0.53	–	708	–	–	–	–
Just et al.	2023	–	–	–	575	–	14	–	–
He et al.	2022	–	0.85	–	447	–	–	–	–
Tarricq et al.	2022	0.42	–	–	708	–	–	–	–
Jaehnig et al.	2021	0.39⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	0.39	0.56	–	417	–	–	–	1
Dias et al.	2021	0.39	0.77	–	607	-0.094	–	–	–
Cantat-Gaudin et al.	2020	0.42	0.30	–	692	–	–	–	–
Cantat-Gaudin & Anders	2020	0.39	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	501	0.500	–	–	–
Bossini et al.	2019	0.37	0.45	–	773	-0.080	–	–	–
Soubiran et al.	2018	0.39	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	0.39	–	–	–	–	–	–	–
Loktin & Popova	2017	0.41	0.55	–	471	–	–	–	–
Kharchenko et al.	2016	0.39	0.55	–	575	–	–	–	–
Kharchenko et al.	2013	0.39	0.55	–	575	0.060	–	–	–
Gozha et al.	2012	0.38	–	–	426	0.060	126	–	–
Piskunov et al.	2008	0.39	0.56	–	575	–	109⁽¹⁾	–	–
Piskunov et al.	2007	0.39	0.56	–	575	–	29	–	–
van den Bergh	2006	0.38	0.56	–	427	–	–	–	–
Kharchenko et al.	2005	0.39	0.56	–	575	–	–	–	–
Kharchenko et al.	2003	0.38	0.56	–	–	–	–	–	–
Chen et al.	2003	0.38	0.56	–	420	0.000⁽¹⁾	–	–	–
Dias et al.	2002	0.38	0.56	–	426	0.060	–	–	–

(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 0067	9.7	277.0	6.72	2.54	1.31	-1.69	-28.71	0.0

💡 Note: The % column shows the percentage of members that Melotte 201 shares with each listed object.

Visualization

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