Melotte 245

(Collinder 460; NGC 7789; MWSC 3779; OCL 269; FSR 0450; FoF 49)

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) 4180

Stellar density (N₅₀/rad) 103.3 [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 245 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 low extinction. It is catalogued as a very massive, 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.

Relatively close Low extinction Very massive Near-solar metallicity Old Contains BSS

Cavallo et al. (2024)
Gold sample.

Rain et al. (2024)
The cluster shows evidence for a double BSS sequence, less pronounced than in Melotte 66. Both sequences are consistent with different binary evolution tracks. Independent studies confirm several BSSs as binaries, but CMD positions of binary and apparently single BSSs overlap without clear separation.

Data

🔍 Search references for Melotte 245 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–	359.313	56.725	0.476	-0.918	-1.952	-54.219
Li et al.	2025	-0.666	56.726	0.453	-0.922	-1.933	–
Hu & Soubiran	2025	359.329	56.726	–	–	–	–
Carrasco-Varela et al.	2025	359.562	56.792	–	–	–	–
Zhang et al.	2024	359.329	56.724	–	–	–	–
Hunt & Reffert	2024	359.329	56.724	0.479	-0.914	-1.952	-53.867
Cavallo et al.	2024	359.329	56.726	0.479	–	–	–
Rain et al.	2024	359.335	56.724	0.478	-0.917	-1.957	–
Hunt & Reffert	2023	359.329	56.724	0.479	-0.914	-1.952	-53.867
Just et al.	2023	359.347	56.726	–	–	–	–
Jaehnig et al.	2021	359.341	56.727	0.483	-0.925	-1.933	–
Rain et al.	2021	359.334	56.726	0.453	-0.922	-1.933	–
Dias et al.	2021	342.296	56.727	0.449	-0.926	-1.931	-54.059
Cantat-Gaudin et al.	2020	-0.666	56.726	0.453	-0.922	-1.933	–
Donor et al.	2020	359.355	56.73	–	-0.95	-1.91	-54.6
Cantat-Gaudin & Anders	2020	-0.666	56.726	0.453	-0.922	-1.933	–
Liu & Pang	2019	359.329	56.728	0.449	-0.924	-1.93	–
Soubiran et al.	2018	359.334	56.726	–	–	–	-54.15
Bica et al.	2019	359.341	56.723	–	–	–	–
Cantat-Gaudin et al.	2018	-0.666	56.726	0.453	-0.922	-1.933	–
Loktin & Popova	2017	359.355	56.708	–	0.145	-0.881	-54.7
Kharchenko et al.	2016	359.347	56.726	–	–	–	–
Dias et al.	2014	359.35	56.708	–	2.86	-0.74	–
Kharchenko et al.	2013	359.355	56.73	–	0.62	-2.87	-54.7
Gozha et al.	2012	359.35	56.708	–	–	–	–
Kharchenko et al.	2012	359.355	56.73	–	0.62	-2.87	-64.0
Piskunov et al.	2008	359.309	56.709	–	–	–	–
Kharchenko et al.	2007	359.35	56.71	–	0.27	–	–
Piskunov et al.	2007	359.309	56.709	–	–	–	–
van den Bergh	2006	359.35	56.708	–	–	–	–
Kharchenko et al.	2005	359.31	56.71	–	3.03	-0.58	–
Kharchenko et al.	2003	359.28	56.7	–	4.08	0.21	–
Chen et al.	2003	359.252	56.712	–	–	–	–
Dias et al.	2002	359.35	56.708	–	2.86	-0.74	-54.7

💡 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–	2.065	0.69	0.26	1698	-0.085	7261	0.24	0.07
Li et al.	2025	1.95	0.95	–	1709	-0.046	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.090⁽⁵⁾	–	–	–
Carrasco-Varela et al.	2025	1.91	1.02	–	1614	-0.100	–	–	0.07⁽¹⁾
Zhang et al.	2024	–	–	–	–	-0.085⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	17849⁽¹⁾	–	–
Cavallo et al.	2024	1.98	1.03	–	1349	0.160	–	–	–
Rain et al.	2024	1.91	1.06	–	1590	–	22150	0.24	–
Hunt & Reffert	2023	1.96	0.78	0.26	1567	–	–	–	–
Just et al.	2023	–	–	–	1841	–	1854	–	–
Jaehnig et al.	2021	2.06⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	2.07	1.83	–	3311	–	–	–	16
Dias et al.	2021	1.91	1.02	–	1618	0.026	–	–	–
Cantat-Gaudin et al.	2020	2.10	0.83	–	1549	–	–	–	–
Donor et al.	2020	–	–	–	–	-0.010	–	–	–
Cantat-Gaudin & Anders	2020	2.07	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	2290	-0.500	–	–	–
Soubiran et al.	2018	2.07	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	2.07	–	–	–	–	–	–	–
Loktin & Popova	2017	2.40	0.66	–	1671	–	–	–	–
Kharchenko et al.	2016	1.80	0.69	–	1841	–	–	–	–
Kharchenko et al.	2013	1.80	0.69	–	1841	-0.240	–	–	–
Gozha et al.	2012	1.79	–	–	1413	-0.240	6166	–	–
Kharchenko et al.	2012	1.80	0.69	–	1841	-0.240	–	–	–
Piskunov et al.	2008	2.34	0.68	–	1698	–	8356⁽¹⁾	–	–
Piskunov et al.	2007	2.34	0.68	–	1698	–	2056	–	–
van den Bergh	2006	2.34	0.68	–	1738	–	–	–	–
Kharchenko et al.	2005	2.34	0.68	–	1698	–	–	–	–
Kharchenko et al.	2003	2.34	0.68	–	–	–	–	–	–
Chen et al.	2003	2.34	0.67	–	1710	-0.080⁽¹⁾	–	–	–
Dias et al.	2002	1.79	0.87	–	1413	0.020	–	–	–

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

Visualization

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