Melotte 156

(Collinder 321; VDBH 207; NGC 6253; MWSC 2502; OCL 972; vdBergh-Hagen 207; ESO 180 02; FSR 1730; FoF 21)

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) 911

Stellar density (N₅₀/rad) 165.3 [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 156 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, below 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 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.

Relatively close Low extinction Massive Near-solar metallicity Old Contains BSS

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Melotte 156 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–	254.781	-52.71	0.582	-4.554	-5.289	-28.391
Li et al.	2025	254.778	-52.712	0.563	-4.537	-5.28	–
Hu & Soubiran	2025	254.785	-52.705	–	–	–	–
Wei et al.	2025	254.783	-52.709	0.586	-4.538	-5.28	–
Carrasco-Varela et al.	2025	255.118	-52.762	–	–	–	–
Almeida et al.	2025	254.779	-52.71	–	–	–	–
Hunt & Reffert	2024	254.771	-52.715	0.584	-4.555	-5.293	-27.693
Cavallo et al.	2024	254.785	-52.705	0.584	–	–	–
Hunt & Reffert	2023	254.771	-52.715	0.584	-4.555	-5.293	-27.693
Almeida et al.	2023	254.78	-52.707	–	–	–	–
Just et al.	2023	254.759	-52.7	–	–	–	–
Jaehnig et al.	2021	254.779	-52.709	0.597	-4.507	-5.287	–
Rain et al.	2021	254.778	-52.712	0.563	-4.537	-5.28	–
Dias et al.	2021	254.779	-52.71	0.559	-4.532	-5.278	-27.932
Cantat-Gaudin et al.	2020	254.778	-52.712	0.563	-4.537	-5.28	–
Cantat-Gaudin & Anders	2020	254.778	-52.712	0.563	-4.537	-5.28	–
Liu & Pang	2019	254.786	-52.705	0.56	-4.516	-5.295	–
Soubiran et al.	2018	254.778	-52.712	–	–	–	-27.97
Bica et al.	2019	254.76	-52.716	–	–	–	–
Cantat-Gaudin et al.	2018	254.778	-52.712	0.563	-4.537	-5.28	–
Kharchenko et al.	2016	254.759	-52.7	–	–	–	–
Dias et al.	2014	254.771	-52.708	–	-1.13	-4.31	–
Kharchenko et al.	2013	254.77	-52.7	–	-6.15	-8.51	-29.4
Gozha et al.	2012	254.771	-52.708	–	–	–	–
van den Bergh	2006	254.775	-52.717	–	–	–	–
Chen et al.	2003	254.773	-52.722	–	–	–	–
Dias et al.	2002	254.771	-52.708	–	-1.16	-4.83	-29.6

💡 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–	1.655	0.79	0.35	3626	0.281	2861	0.625	0.14
Li et al.	2025	1.63	0.79	–	3705	0.261	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.150⁽⁵⁾	–	–	–
Wei et al.	2025	1.78	0.82	–	3548	0.250	4141	0.61	–
Carrasco-Varela et al.	2025	1.67	0.79	–	3540	0.300	–	–	0.14⁽¹⁾
Almeida et al.	2025	1.67	0.79	–	3540	–	1455	–	–
Hunt & Reffert	2024	–	–	–	–	–	4476⁽¹⁾	–	–
Cavallo et al.	2024	1.66	0.79	–	3548	0.190	–	–	–
Hunt & Reffert	2023	1.65	0.90	0.35	1854	–	–	–	–
Almeida et al.	2023	1.59	1.04	–	3350	0.036	2861⁽¹⁾	0.64	–
Just et al.	2023	–	–	–	5012	–	72	–	–
Jaehnig et al.	2021	1.67⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	1.69	0.62	–	5012	–	–	–	14
Dias et al.	2021	1.67	0.79	–	3540	0.301	–	–	–
Cantat-Gaudin et al.	2020	1.65	0.78	–	3236	–	–	–	–
Cantat-Gaudin & Anders	2020	1.69	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	3240	0.250	–	–	–
Soubiran et al.	2018	1.69	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	1.69	–	–	–	–	–	–	–
Kharchenko et al.	2016	1.51	0.62	–	5012	–	–	–	–
Kharchenko et al.	2013	1.51	0.62	–	5012	0.430	–	–	–
Gozha et al.	2012	1.58	–	–	5012	0.430	–	–	–
van den Bergh	2006	1.51	0.62	–	5012	–	–	–	–
Chen et al.	2003	1.51	0.62	–	5000	0.360⁽¹⁾	–	–	–
Dias et al.	2002	1.51	0.62	–	5012	0.445	–	–	–

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

Visualization

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