Melotte 21

(Collinder 40; NGC 1342; MWSC 283; OCL 401; FSR 0679; FoF 2265)

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) 799

Stellar density (N₅₀/rad) 52.9 [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

ℹ️

Melotte 21 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a close distance, below the mid-plane, affected by moderate 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.

Close Moderate extinction Near-solar metallicity Intermediate age Contains BSS

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 21 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	52.898	37.391	1.519	0.407	-1.678	-10.514
Li et al.	2025	52.894	37.38	1.502	0.52	-1.604	–
Wei et al.	2025	52.908	37.39	1.525	0.406	-1.659	–
Almeida et al.	2025	52.87	37.397	–	–	–	–
Alfonso et al.	2024	52.909	37.39	1.485	0.414	-1.661	–
Zhang et al.	2024	52.953	37.387	–	–	–	–
Hunt & Reffert	2024	52.953	37.387	1.525	0.425	-1.665	-10.159
Cavallo et al.	2024	52.886	37.388	1.525	–	–	–
Hunt & Reffert	2023	52.953	37.387	1.525	0.425	-1.665	-10.159
Almeida et al.	2023	52.868	37.396	–	–	–	–
Just et al.	2023	52.995	37.356	–	–	–	–
He et al.	2022	52.91	37.383	1.522	0.415	-1.672	–
Tarricq et al.	2022	52.982	37.404	1.52	0.423	-1.68	–
Jaehnig et al.	2021	52.953	37.358	1.54	0.556	-1.605	–
Rain et al.	2021	52.894	37.38	1.502	0.52	-1.604	–
Dias et al.	2021	52.87	37.397	1.505	0.523	-1.598	-9.414
Cantat-Gaudin et al.	2020	52.894	37.38	1.502	0.52	-1.604	–
Cantat-Gaudin & Anders	2020	52.894	37.38	1.502	0.52	-1.604	–
Liu & Pang	2019	52.87	37.356	1.498	0.516	-1.595	–
Soubiran et al.	2018	52.894	37.38	–	–	–	-9.95
Bica et al.	2019	52.918	37.374	–	–	–	–
Cantat-Gaudin et al.	2018	52.894	37.38	1.502	0.52	-1.604	–
Loktin & Popova	2017	52.905	37.377	–	-2.704	-8.046	-11.5
Kharchenko et al.	2016	52.995	37.356	–	–	–	–
Dias et al.	2014	52.908	37.377	–	-2.99	-1.82	–
Kharchenko et al.	2013	53.004	37.357	–	-3.12	-5.5	-11.5
Gozha et al.	2012	52.908	37.377	–	–	–	–
Kharchenko et al.	2012	53.004	37.357	–	-3.12	-5.5	-11.5
Piskunov et al.	2008	52.898	37.336	–	–	–	–
Kharchenko et al.	2007	52.9	37.38	–	0.25	–	-11.5
Piskunov et al.	2007	52.898	37.336	–	–	–	–
van den Bergh	2006	53.31	37.418	–	–	–	–
Kharchenko et al.	2005	52.9	37.34	–	0.13	-2.72	–
Kharchenko et al.	2003	52.9	37.33	–	0.47	-2.86	–
Chen et al.	2003	52.91	37.341	–	-0.55	-2.89	-10.9
Dias et al.	2002	52.908	37.377	–	-2.99	-1.82	-10.67

💡 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–	0.67	1.03	2.41	447	-0.136	474	0.525	1.0
Li et al.	2025	0.62	1.11	–	496	-0.136	–	–	–
Wei et al.	2025	0.98	1.51	–	380	0.000	792	0.49	–
Almeida et al.	2025	0.63	1.23	–	578	–	880	–	–
Alfonso et al.	2024	0.69	0.71	–	1113	-0.113	–	–	–
Zhang et al.	2024	–	–	–	–	-0.200⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	1311⁽¹⁾	–	–
Cavallo et al.	2024	0.66	1.27	–	288	0.260	–	–	–
Hunt & Reffert	2023	0.63	1.37	2.41	160	–	–	–	–
Almeida et al.	2023	0.64	1.26	–	403	-0.005	925⁽¹⁾	0.56	–
Just et al.	2023	–	–	–	398	–	42	–	–
He et al.	2022	–	1.50	–	316	–	–	–	–
Tarricq et al.	2022	0.68	–	–	851	–	–	–	–
Jaehnig et al.	2021	0.65⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	0.65	0.96	–	447	–	–	–	1
Dias et al.	2021	0.63	1.23	–	578	-0.115	–	–	–
Cantat-Gaudin et al.	2020	0.69	0.71	–	813	–	–	–	–
Cantat-Gaudin & Anders	2020	0.65	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	871	0.250	–	–	–
Soubiran et al.	2018	0.65	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	0.65	–	–	–	–	–	–	–
Loktin & Popova	2017	0.67	1.07	–	452	–	–	–	–
Kharchenko et al.	2016	0.67	1.03	–	398	–	–	–	–
Kharchenko et al.	2013	0.67	1.03	–	398	-0.160	–	–	–
Gozha et al.	2012	0.67	–	–	452	-0.160	155	–	–
Kharchenko et al.	2012	0.67	1.03	–	398	-0.160	–	–	–
Piskunov et al.	2008	0.67	0.99	–	162	–	132⁽¹⁾	–	–
Piskunov et al.	2007	0.67	0.99	–	162	–	33	–	–
van den Bergh	2006	0.67	0.99	–	457	–	–	–	–
Kharchenko et al.	2005	0.67	0.99	–	162	–	–	–	–
Kharchenko et al.	2003	0.67	0.99	–	–	–	–	–	–
Chen et al.	2003	0.67	0.99	–	450	-0.160⁽¹⁾	–	–	–
Dias et al.	2002	0.67	0.99	–	452	-0.160	–	–	–

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

Visualization

ℹ️

1 2 3