Melotte 197

(Collinder 374; NGC 6603; MWSC 2883; OCL 36; FSR 0045)

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) 829

Stellar density (N₅₀/rad) 196.1 [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 197 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 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 Moderate extinction Massive Near-solar metallicity Intermediate age Contains BSS

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

Cavallo et al. (2024)
Silver sample.

Data

🔍 Search references for Melotte 197 in: SciX Simbad

ℹ️

Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	274.612	-18.411	0.325	0.141	-2.059	18.504
Almeida et al.	2025	274.614	-18.409	–	–	–	–
Hunt & Reffert	2024	274.613	-18.409	0.326	0.147	-2.054	16.931
Cavallo et al.	2024	274.615	-18.41	0.327	–	–	–
Hunt & Reffert	2023	274.613	-18.409	0.326	0.147	-2.054	16.931
Just et al.	2023	274.597	-18.431	–	–	–	–
Jaehnig et al.	2021	274.617	-18.41	0.347	0.108	-2.036	–
Rain et al.	2021	274.616	-18.409	0.324	0.119	-2.042	–
Dias et al.	2021	274.614	-18.409	0.323	0.129	-2.032	18.146
Cantat-Gaudin et al.	2020	274.616	-18.409	0.324	0.119	-2.042	–
Sánchez et al.	2020	274.608	-18.407	–	0.143	-2.131	–
Cantat-Gaudin & Anders	2020	274.616	-18.409	0.324	0.119	-2.042	–
Soubiran et al.	2018	274.616	-18.409	–	–	–	17.91
Bica et al.	2019	274.603	-18.404	–	–	–	–
Cantat-Gaudin et al.	2018	274.616	-18.409	0.324	0.119	-2.042	–
Kharchenko et al.	2016	274.597	-18.431	–	–	–	–
Dias et al.	2014	274.608	-18.407	–	1.06	-0.74	–
Kharchenko et al.	2013	274.605	-18.43	–	-1.28	-2.86	21.3
Gozha et al.	2012	274.608	-18.407	–	–	–	–
Piskunov et al.	2008	274.597	-18.435	–	–	–	–
van den Bergh	2006	274.6	-18.433	–	–	–	–
Kharchenko et al.	2005	274.6	-18.43	–	0.85	0.93	–
Kharchenko et al.	2003	274.56	-18.45	–	0.95	0.66	–
Dias et al.	2002	274.608	-18.407	–	1.06	-0.72	21.34

💡 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–	2.83	2.45	2.39	214	0.153	3786	–	4.0
Almeida et al.	2025	2.07	2.00	–	445	–	2560	–	–
Hunt & Reffert	2024	–	–	–	–	–	10158⁽¹⁾	–	–
Cavallo et al.	2024	1.67	3.37	–	209	-1.250	–	–	–
Hunt & Reffert	2023	2.82	2.65	2.39	161	–	–	–	–
Just et al.	2023	–	–	–	251	–	552	–	–
Jaehnig et al.	2021	2.89⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	2.83	2.45	–	562	–	–	–	4
Dias et al.	2021	2.07	2.00	–	445	0.153	–	–	–
Cantat-Gaudin et al.	2020	2.73	1.63	–	219	–	–	–	–
Cantat-Gaudin & Anders	2020	2.83	–	–	–	–	–	–	–
Soubiran et al.	2018	2.83	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.83	–	–	–	–	–	–	–
Kharchenko et al.	2016	2.33	2.58	–	251	–	–	–	–
Kharchenko et al.	2013	2.33	2.58	–	251	–	–	–	–
Gozha et al.	2012	3.60	–	–	200	–	5012	–	–
Piskunov et al.	2008	2.88	1.55	–	63	–	–	–	–
van den Bergh	2006	3.60	2.45	–	200	–	–	–	–
Kharchenko et al.	2005	2.88	1.55	–	63	–	–	–	–
Kharchenko et al.	2003	2.88	1.86	–	–	–	–	–	–
Dias et al.	2002	3.60	2.45	–	200	0.430	–	–	–

(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 0022	1.0	274.6	-18.38	0.54	-0.01	-1.98	–	0.1

💡 Note: The % column shows the percentage of members that Melotte 197 shares with each listed object.

Visualization

ℹ️

1 2 3