Melotte 55

(Collinder 120; NGC 2304; MWSC 1019; OCL 484; FSR 0959; FoF 620)

0.96 UTI

0.78

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 187

Stellar density (N₅₀/rad) 21.2 [N/pc²]

C3 classification AA

C_N 0.78 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 55 is a 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 near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the metallicity parameter (see Parameters). It is very well-studied in the literature.

Distant Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Melotte 55 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–	103.802	17.985	0.235	-0.001	-1.457	51.208
Li et al.	2025	103.802	17.984	0.219	-0.024	-1.514	–
Hu & Soubiran	2025	103.8	17.986	–	–	–	–
Almeida et al.	2025	103.803	17.985	–	–	–	–
Zhang et al.	2024	103.803	17.985	–	–	–	–
Hunt & Reffert	2024	103.803	17.985	0.239	0.002	-1.466	54.079
Cavallo et al.	2024	103.8	17.986	0.241	–	–	–
Hunt & Reffert	2023	103.803	17.985	0.239	0.002	-1.466	54.079
Just et al.	2023	103.791	17.982	–	–	–	–
Jaehnig et al.	2021	103.816	17.978	0.264	-0.036	-1.501	–
Rain et al.	2021	103.802	17.984	0.219	-0.024	-1.514	–
Dias et al.	2021	103.803	17.985	0.215	-0.023	-1.538	62.074
Cantat-Gaudin et al.	2020	103.802	17.984	0.219	-0.024	-1.514	–
Donor et al.	2020	103.8	17.98	–	-0.12	-1.52	51.5
Cantat-Gaudin & Anders	2020	103.802	17.984	0.219	-0.024	-1.514	–
Liu & Pang	2019	103.794	17.991	0.239	-0.025	-1.459	–
Soubiran et al.	2018	103.802	17.984	–	–	–	53.29
Bica et al.	2019	103.801	17.987	–	–	–	–
Cantat-Gaudin et al.	2018	103.802	17.984	0.219	-0.024	-1.514	–
Loktin & Popova	2017	103.8	17.984	–	-0.382	-0.69	43.4
Kharchenko et al.	2016	103.791	17.982	–	–	–	–
Dias et al.	2014	103.804	17.983	–	-1.49	-6.24	–
Kharchenko et al.	2013	103.8	17.98	–	-0.67	-3.0	43.4
Gozha et al.	2012	103.804	17.982	–	–	–	–
van den Bergh	2006	103.754	18.021	–	–	–	–
Chen et al.	2003	103.787	17.992	–	–	–	–
Dias et al.	2002	103.804	17.983	–	-1.49	-6.24	–

💡 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–	3.99	0.31	0.47	737	-0.320	698	–	0.0
Li et al.	2025	4.31	0.37	–	847	-0.128	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.340⁽⁵⁾	–	–	–
Almeida et al.	2025	3.87	0.24	–	889	–	648	–	–
Zhang et al.	2024	–	–	–	–	-0.181⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	1135⁽¹⁾	–	–
Cavallo et al.	2024	2.90	0.46	–	1175	-0.680	–	–	–
Hunt & Reffert	2023	3.74	0.05	0.47	1242	–	–	–	–
Just et al.	2023	–	–	–	684	–	698	–	–
Jaehnig et al.	2021	3.93⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	4.04	0.31	–	631	–	–	–	0
Dias et al.	2021	3.87	0.24	–	889	-0.100	–	–	–
Cantat-Gaudin et al.	2020	3.84	0.11	–	912	–	–	–	–
Donor et al.	2020	–	–	–	–	-0.120	–	–	–
Cantat-Gaudin & Anders	2020	4.04	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	576	0.250	–	–	–
Soubiran et al.	2018	4.04	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	4.04	–	–	–	–	–	–	–
Loktin & Popova	2017	4.25	0.16	–	488	–	–	–	–
Kharchenko et al.	2016	3.90	0.45	–	684	–	–	–	–
Kharchenko et al.	2013	3.90	0.45	–	684	-0.320	–	–	–
Gozha et al.	2012	4.40	–	–	631	-0.320	–	–	–
van den Bergh	2006	3.99	0.31	–	794	–	–	–	–
Chen et al.	2003	3.99	0.31	–	790	-0.320⁽¹⁾	–	–	–
Dias et al.	2002	4.40	0.31	–	631	-0.320	–	–	–

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

Visualization

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