Melotte 69

(Collinder 154; NGC 2420; MWSC 1292; OCL 488; FoF 642)

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) 1207

Stellar density (N₅₀/rad) 62.3 [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 69 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, well above 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 metallicity parameter (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.

Relatively close 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 69 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–	114.603	21.577	0.383	-1.211	-2.044	73.593
Li et al.	2025	114.602	21.575	0.363	-1.19	-2.125	–
Hu & Soubiran	2025	114.606	21.576	–	–	–	–
Wei et al.	2025	114.603	21.576	0.399	-1.224	-2.042	–
Carrasco-Varela et al.	2025	114.861	21.514	–	–	–	–
Almeida et al.	2025	114.605	21.572	–	–	–	–
Zhang et al.	2024	114.602	21.574	–	–	–	–
Hunt & Reffert	2024	114.602	21.574	0.39	-1.215	-2.039	72.165
Cavallo et al.	2024	114.606	21.576	0.391	–	–	–
Hunt & Reffert	2023	114.602	21.574	0.39	-1.215	-2.039	72.165
Cordoni et al.	2023	114.605	21.572	0.363	-1.202	-2.124	–
Just et al.	2023	114.587	21.569	–	–	–	–
Jaehnig et al.	2021	114.603	21.576	0.391	-1.192	-2.118	–
Rain et al.	2021	114.602	21.575	0.363	-1.19	-2.125	–
Dias et al.	2021	114.605	21.572	0.363	-1.202	-2.124	74.291
Cantat-Gaudin et al.	2020	114.602	21.575	0.363	-1.19	-2.125	–
Donor et al.	2020	114.596	21.567	–	-1.14	-2.11	74.4
Cantat-Gaudin & Anders	2020	114.602	21.575	0.363	-1.19	-2.125	–
Liu & Pang	2019	114.607	21.579	0.366	-1.181	-2.129	–
Bossini et al.	2019	114.602	21.575	–	–	–	–
Soubiran et al.	2018	114.602	21.575	–	–	–	74.22
Bica et al.	2019	114.603	21.573	–	–	–	–
Cantat-Gaudin et al.	2018	114.602	21.575	0.363	-1.19	-2.125	–
Loktin & Popova	2017	114.6	21.573	–	-2.547	-3.982	67.0
Kharchenko et al.	2016	114.587	21.569	–	–	–	–
Dias et al.	2014	114.596	21.573	–	-1.76	-2.38	–
Kharchenko et al.	2013	114.595	21.567	–	-2.56	-3.83	67.0
Gozha et al.	2012	114.596	21.573	–	–	–	–
Kharchenko et al.	2007	114.6	21.57	–	0.04	–	–
van den Bergh	2006	114.596	21.573	–	–	–	–
Chen et al.	2003	114.593	21.569	–	–	–	–
Dias et al.	2002	114.596	21.573	–	-1.76	-2.38	73.57

💡 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–	2.55	0.1	0.13	2223	-0.203	2032	0.455	0.05
Li et al.	2025	2.44	0.18	–	2239	-0.203	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.300⁽⁵⁾	–	–	–
Wei et al.	2025	2.41	0.02	–	2630	0.000	2764	0.59	–
Carrasco-Varela et al.	2025	2.44	0.12	–	2223	-0.150	–	–	0.05⁽¹⁾
Almeida et al.	2025	2.44	0.12	–	2223	–	1876	–	–
Zhang et al.	2024	–	–	–	–	-0.260⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	3480⁽¹⁾	–	–
Cavallo et al.	2024	2.32	0.10	–	2239	-0.020	–	–	–
Hunt & Reffert	2023	2.28	0.03	0.13	2249	–	–	–	–
Cordoni et al.	2023	2.43	0.12	–	2223	-0.100	1571	0.32	0.04
Just et al.	2023	–	–	–	2317	–	2032	–	–
Jaehnig et al.	2021	2.57⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	2.55	0.12	–	1995	–	–	–	3
Dias et al.	2021	2.44	0.12	–	2223	-0.100	–	–	–
Cantat-Gaudin et al.	2020	2.58	0.04	–	1738	–	–	–	–
Donor et al.	2020	–	–	–	–	-0.190	–	–	–
Cantat-Gaudin & Anders	2020	2.55	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	2510	-0.500	–	–	–
Bossini et al.	2019	2.57	0.19	–	1866	-0.050	–	–	–
Soubiran et al.	2018	2.55	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.55	–	–	–	–	–	–	–
Loktin & Popova	2017	3.12	0.10	–	1127	–	–	–	–
Kharchenko et al.	2016	2.88	0.03	–	2317	–	–	–	–
Kharchenko et al.	2013	2.88	0.03	–	2317	-0.380	–	–	–
Gozha et al.	2012	2.48	–	–	1995	-0.380	–	–	–
van den Bergh	2006	3.08	0.09	–	1122	–	–	–	–
Chen et al.	2003	3.08	0.09	–	1110	-0.260⁽¹⁾	–	–	–
Dias et al.	2002	2.48	0.12	–	1995	-0.380	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
Theia 6042	2.1	114.62	21.57	0.47	-1.13	-2.07	72.68	0.0

💡 Note: The % column shows the percentage of members that Melotte 69 shares with each listed object.

Visualization

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