Melotte 22

(Collinder 42; Pleiades; MWSC 305; Messier 45; M45; OCL 421; Escorial 1; OCSN 219)

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) 1678

Stellar density (N₅₀/rad) 117.8 [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 22 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a very close distance, near 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 absorption parameter (see Parameters). It is very well-studied in the literature.

Very close 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 22 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–	56.6	24.114	7.361	19.904	-45.35	5.491
Li et al.	2025	56.601	24.114	7.346	20.077	-45.503	–
Wei et al.	2025	56.646	24.17	7.362	19.93	-45.449	–
Almeida et al.	2025	56.647	24.099	–	–	–	–
Alfonso et al.	2024	56.608	24.102	7.322	19.92	-45.402	–
Zhang et al.	2024	56.68	24.108	–	–	–	–
Hunt & Reffert	2024	56.68	24.108	7.378	19.955	-45.457	5.343
Cavallo et al.	2024	56.601	24.191	7.373	–	–	–
Hunt & Reffert	2023	56.68	24.108	7.378	19.955	-45.457	5.343
Almeida et al.	2023	56.811	24.189	–	–	–	–
Cordoni et al.	2023	56.647	24.099	7.352	19.954	-45.511	–
Qin et al.	2023	56.7	24.08	7.36	19.95	-45.35	5.66
Just et al.	2023	56.497	24.369	–	–	–	–
He et al.	2022	56.606	24.145	7.365	19.995	-45.434	–
Tarricq et al.	2022	56.742	24.093	7.354	19.959	-45.398	–
Jaehnig et al.	2021	56.557	24.086	7.368	20.03	-45.452	–
Rain et al.	2021	56.601	24.114	7.346	20.077	-45.503	–
Dias et al.	2021	56.647	24.099	7.352	19.954	-45.511	5.792
Cantat-Gaudin et al.	2020	56.601	24.114	7.346	20.077	-45.503	–
Donor et al.	2020	56.505	24.37	–	20.35	-44.59	6.1
Cantat-Gaudin & Anders	2020	56.601	24.114	7.346	20.077	-45.503	–
Bossini et al.	2019	56.601	24.114	–	–	–	–
Soubiran et al.	2018	56.601	24.114	–	–	–	5.92
Bica et al.	2019	56.743	24.124	–	–	–	–
Cantat-Gaudin et al.	2018	56.601	24.114	7.346	20.077	-45.503	–
Yen et al.	2018	56.57	24.224	7.38	19.92	-45.2	–
Loktin & Popova	2017	56.745	24.117	–	19.85	-44.81	5.5
Kharchenko et al.	2016	56.497	24.369	–	–	–	–
Dias et al.	2014	56.75	24.117	–	18.93	-45.68	–
Kharchenko et al.	2013	56.505	24.37	–	19.4	-46.0	5.5
Gozha et al.	2012	56.75	24.117	–	–	–	–
Kharchenko et al.	2012	56.505	24.37	–	19.4	-46.0	5.9
Piskunov et al.	2008	56.832	24.118	–	–	–	–
Kharchenko et al.	2007	56.74	24.12	–	6.4	–	5.9
Piskunov et al.	2007	56.832	24.118	–	–	–	–
van den Bergh	2006	56.85	24.117	–	–	–	–
Kharchenko et al.	2005	56.83	24.12	–	19.33	-45.0	5.41
Kharchenko et al.	2003	56.83	24.12	–	19.44	-44.41	–
Chen et al.	2003	56.75	24.118	–	19.15	-45.72	5.6
Dias et al.	2002	56.75	24.117	–	19.88	-45.0	5.94
Dambis	1999	56.75	24.117	–	–	–	–

💡 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–	0.14	0.1	0.63	130	0.000	936	0.15	0.0
Li et al.	2025	0.14	0.22	–	120	0.086	–	–	–
Wei et al.	2025	0.14	0.36	–	98	0.000	504	0.10	–
Almeida et al.	2025	0.14	0.17	–	131	–	653	–	–
Alfonso et al.	2024	0.13	0.17	–	103	0.029	–	–	–
Zhang et al.	2024	–	–	–	–	-0.000⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	947⁽¹⁾	–	–
Cavallo et al.	2024	0.14	0.67	–	87	0.100	–	–	–
Hunt & Reffert	2023	0.13	0.10	0.63	122	–	–	–	–
Almeida et al.	2023	0.14	0.35	–	101	-0.017	816⁽¹⁾	0.18	–
Cordoni et al.	2023	0.14	0.17	–	131	0.032	936	0.15	0.00
Qin et al.	2023	0.15	0.25	–	100	–	–	–	–
Just et al.	2023	–	–	–	141	–	1452	–	–
He et al.	2022	–	0.55	–	141	–	–	–	–
Tarricq et al.	2022	0.13	–	–	79	–	–	–	–
Jaehnig et al.	2021	0.14⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	0.14	0.09	–	135	–	–	–	0
Dias et al.	2021	0.14	0.17	–	131	0.032	–	–	–
Cantat-Gaudin et al.	2020	0.13	0.18	–	78	–	–	–	–
Donor et al.	2020	–	–	–	–	0.000	–	–	–
Cantat-Gaudin & Anders	2020	0.14	–	–	–	–	–	–	–
Bossini et al.	2019	0.14	0.14	–	86	0.000	–	–	–
Soubiran et al.	2018	0.14	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	0.14	–	–	–	–	–	–	–
Yen et al.	2018	0.13	0.03	–	141	–	–	–	–
Loktin & Popova	2017	0.15	0.09	–	135	–	–	–	–
Kharchenko et al.	2016	0.13	0.07	–	141	–	–	–	–
Kharchenko et al.	2013	0.13	0.07	–	141	-0.036	–	–	–
Gozha et al.	2012	0.13	–	–	135	-0.030	468	–	–
Kharchenko et al.	2012	0.13	0.07	–	141	-0.030	–	–	–
Piskunov et al.	2008	0.13	0.06	–	120	–	3467⁽¹⁾	–	–
Piskunov et al.	2007	0.13	0.06	–	120	–	3105	–	–
van den Bergh	2006	0.15	0.09	–	135	–	–	–	–
Kharchenko et al.	2005	0.13	0.06	–	120	–	–	–	–
Kharchenko et al.	2003	0.12	0.06	–	–	–	–	–	–
Chen et al.	2003	0.15	0.09	–	130	-0.030⁽¹⁾	–	–	–
Dias et al.	2002	0.13	0.09	–	135	-0.030	–	–	–
Dambis	1999	0.12	0.12	–	112	–	–	–	–

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

Visualization

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