Melotte 181

(Collinder 352; VDBH 250; NGC 6451; MWSC 2718; OCL 1035; vdBergh-Hagen 250; ESO 455 50)

0.98 UTI

0.9

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 489

Stellar density (N₅₀/rad) 35.7 [N/pc²]

C3 classification AA

C_N 0.9 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 181 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a moderate distance, below the mid-plane, affected by moderate extinction. It is catalogued as a massive, 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 shares a large percentage of members with 3 later reported entries. See table with shared members information.

Relatively close Moderate extinction Massive Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Silver sample.

Data

🔍 Search references for Melotte 181 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–	267.675	-30.209	0.33	-0.104	-1.344	-7.854
Li et al.	2025	267.675	-30.206	0.304	-0.105	-1.335	–
Almeida et al.	2025	267.667	-30.203	–	–	–	–
Hunt & Reffert	2024	267.671	-30.21	0.332	-0.111	-1.345	-4.689
Celli et al.	2024	267.675	-30.206	–	–	–	–
Cavallo et al.	2024	267.662	-30.203	0.332	–	–	–
Hunt & Reffert	2023	267.671	-30.21	0.332	-0.111	-1.345	-4.689
Just et al.	2023	267.661	-30.201	–	–	–	–
Jaehnig et al.	2021	267.683	-30.206	0.323	-0.095	-1.352	–
Rain et al.	2021	267.675	-30.206	0.304	-0.105	-1.335	–
Dias et al.	2021	267.667	-30.203	0.307	-0.111	-1.333	–
Cantat-Gaudin et al.	2020	267.675	-30.206	0.304	-0.105	-1.335	–
Sánchez et al.	2020	267.671	-30.21	–	-0.177	-1.393	–
Cantat-Gaudin & Anders	2020	267.675	-30.206	0.304	-0.105	-1.335	–
Soubiran et al.	2018	267.675	-30.206	–	–	–	5.49
Bica et al.	2019	267.672	-30.208	–	–	–	–
Cantat-Gaudin et al.	2018	267.675	-30.206	0.304	-0.105	-1.335	–
Loktin & Popova	2017	267.675	-30.211	–	-1.241	-3.394	-23.0
Kharchenko et al.	2016	267.661	-30.201	–	–	–	–
Dias et al.	2014	267.671	-30.21	–	1.32	-1.8	–
Kharchenko et al.	2013	267.67	-30.2	–	2.7	1.87	-23.0
Gozha et al.	2012	267.671	-30.21	–	–	–	–
Kharchenko et al.	2007	267.67	-30.21	–	0.06	–	–
van den Bergh	2006	267.675	-30.217	–	–	–	–
Dias et al.	2002	267.671	-30.21	–	1.32	-1.8	-23.0

💡 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–	2.66	2.165	2.25	135	-0.305	3102	–	0.0
Li et al.	2025	2.25	2.30	–	94	0.264	–	–	–
Almeida et al.	2025	2.79	2.37	–	8	–	2025	–	–
Hunt & Reffert	2024	–	–	–	–	–	8047⁽¹⁾	–	–
Celli et al.	2024	–	–	–	26	–	1633	–	–
Cavallo et al.	2024	2.00	3.17	–	41	-1.570	–	–	–
Hunt & Reffert	2023	2.66	2.56	2.25	50	–	–	–	–
Just et al.	2023	–	–	–	282	–	4178	–	–
Jaehnig et al.	2021	3.12⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	3.00	2.08	–	135	–	–	–	0
Dias et al.	2021	2.79	2.37	–	8	0.457	–	–	–
Cantat-Gaudin et al.	2020	2.78	2.20	–	26	–	–	–	–
Cantat-Gaudin & Anders	2020	3.00	–	–	–	–	–	–	–
Soubiran et al.	2018	3.00	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	3.00	–	–	–	–	–	–	–
Loktin & Popova	2017	2.08	2.08	–	137	–	–	–	–
Kharchenko et al.	2016	2.60	2.13	–	282	–	–	–	–
Kharchenko et al.	2013	2.60	2.13	–	282	-0.340	–	–	–
Gozha et al.	2012	2.08	–	–	136	-0.270	–	–	–
van den Bergh	2006	2.08	2.08	–	135	–	–	–	–
Dias et al.	2002	2.08	2.08	–	136	-0.340	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 570	95.1	267.68	-30.21	0.33	-0.11	-1.35	-7.85	0.03
OC 0703	8.2	267.67	-30.2	0.31	-0.14	-1.38	-8.52	0.0
OC 0702	0.4	267.67	-30.21	0.52	-0.12	-1.11	8.5	0.23

💡 Note: The % column shows the percentage of members that Melotte 181 shares with each listed object.

Visualization

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