Melotte 42

(Collinder 86; NGC 2192; MWSC 820; OCL 437; FoF 641)

0.92 UTI

0.84

C_N

1.0

C_dens

0.75

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 337

Stellar density (N₅₀/rad) 18.6 [N/pc²]

C3 classification AB

C_N 0.84 Rich
C_dens 1.0 Very dense
C_C3 0.75 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 42 is a rich, very dense object of 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 near-solar metallicity, old cluster, but with a large variance across recent sources for the mass 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.

Distant Low extinction Near-solar metallicity Old Contains BSS

Almeida et al. (2025)
Mass determination: good fit. Isochrone match: intermediate fit. Silver sample.

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Melotte 42 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	93.823	39.844	0.233	0.188	-1.964	15.511
Li et al.	2025	93.819	39.846	0.223	0.193	-1.962	–
Hu & Soubiran	2025	93.82	39.84	–	–	–	–
Almeida et al.	2025	93.824	39.843	–	–	–	–
Zhang et al.	2024	93.822	39.843	–	–	–	–
Hunt & Reffert	2024	93.822	39.843	0.228	0.189	-1.969	20.754
Cavallo et al.	2024	93.82	39.84	0.23	–	–	–
Hunt & Reffert	2023	93.822	39.843	0.228	0.189	-1.969	20.754
Almeida et al.	2023	93.82	39.841	–	–	–	–
Just et al.	2023	93.811	39.87	–	–	–	–
Jaehnig et al.	2021	93.816	39.856	0.268	0.219	-1.978	–
Rain et al.	2021	93.819	39.846	0.223	0.193	-1.962	–
Dias et al.	2021	93.824	39.843	0.219	0.189	-1.977	–
Cantat-Gaudin et al.	2020	93.819	39.846	0.223	0.193	-1.962	–
Cantat-Gaudin & Anders	2020	93.819	39.846	0.223	0.193	-1.962	–
Liu & Pang	2019	93.835	39.826	0.25	0.307	-1.908	–
Bica et al.	2019	93.79	39.848	–	–	–	–
Cantat-Gaudin et al.	2018	93.819	39.846	0.223	0.193	-1.962	–
Loktin & Popova	2017	93.825	39.856	–	0.18	-5.31	–
Kharchenko et al.	2016	93.811	39.87	–	–	–	–
Dias et al.	2014	93.821	39.855	–	0.18	-5.31	–
Kharchenko et al.	2013	93.82	39.868	–	-2.68	-3.32	–
Gozha et al.	2012	93.821	39.855	–	–	–	–
Kharchenko et al.	2012	93.82	39.868	–	-2.68	-3.32	–
Dias et al.	2002	93.821	39.855	–	0.18	-5.31	–

💡 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–	3.5	0.5	0.22	1411	-0.250	856	0.47	1.0
Li et al.	2025	3.95	0.56	–	1181	-0.116	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.280⁽⁵⁾	–	–	–
Almeida et al.	2025	3.48	0.61	–	1297	–	946	–	–
Zhang et al.	2024	–	–	–	–	-0.023⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	1771⁽¹⁾	–	–
Cavallo et al.	2024	3.16	0.67	–	1318	-0.240	–	–	–
Hunt & Reffert	2023	4.13	0.19	0.22	1069	–	–	–	–
Almeida et al.	2023	3.38	0.44	–	1409	-0.164	765⁽¹⁾	0.47	–
Just et al.	2023	–	–	–	1778	–	420	–	–
Jaehnig et al.	2021	3.87⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	3.96	0.50	–	1413	–	–	–	1
Dias et al.	2021	3.48	0.61	–	1297	-0.181	–	–	–
Cantat-Gaudin et al.	2020	3.60	0.43	–	977	–	–	–	–
Cantat-Gaudin & Anders	2020	3.96	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	1450	-0.250	–	–	–
Cantat-Gaudin et al.	2018	3.96	–	–	–	–	–	–	–
Loktin & Popova	2017	3.77	0.53	–	575	–	–	–	–
Kharchenko et al.	2016	3.50	0.31	–	1778	–	–	–	–
Kharchenko et al.	2013	3.50	0.31	–	1778	-0.310	–	–	–
Gozha et al.	2012	3.47	–	–	1413	-0.270	–	–	–
Kharchenko et al.	2012	3.50	0.31	–	1778	-0.310	–	–	–
Dias et al.	2002	3.47	0.50	–	1413	-0.310	–	–	–

(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 0291	8.6	93.84	39.85	0.25	0.17	-1.96	18.57	0.0

💡 Note: The % column shows the percentage of members that Melotte 42 shares with each listed object.

Visualization

ℹ️

1 2 3