Melotte 45

(Collinder 90; NGC 2215; MWSC 843; OCL 550; FoF 2204)

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) 176

Stellar density (N₅₀/rad) 22.6 [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 45 is a rich, very dense object of very high C3 quality. Its parallax locates it at a close distance, below 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.

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 45 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–	95.223	-7.273	1.033	0.414	-3.679	-4.193
Li et al.	2025	95.199	-7.277	1.021	0.436	-3.673	–
Hu & Soubiran	2025	95.195	-7.269	–	–	–	–
Almeida et al.	2025	95.169	-7.275	–	–	–	–
Alfonso et al.	2024	95.205	-7.292	0.988	0.414	-3.66	–
Hunt & Reffert	2024	95.222	-7.274	1.031	0.407	-3.692	-3.6
Cavallo et al.	2024	95.195	-7.269	1.04	–	–	–
Hunt & Reffert	2023	95.222	-7.274	1.031	0.407	-3.692	-3.6
Almeida et al.	2023	95.197	-7.247	–	–	–	–
Just et al.	2023	95.213	-7.294	–	–	–	–
He et al.	2022	95.191	-7.271	1.036	0.427	-3.677	–
Tarricq et al.	2022	95.227	-7.287	1.024	0.42	-3.655	–
Jaehnig et al.	2021	95.203	-7.263	1.053	0.424	-3.659	–
Rain et al.	2021	95.199	-7.277	1.021	0.436	-3.673	–
Dias et al.	2021	95.169	-7.275	1.019	0.427	-3.667	-2.156
Cantat-Gaudin et al.	2020	95.199	-7.277	1.021	0.436	-3.673	–
Cantat-Gaudin & Anders	2020	95.199	-7.277	1.021	0.436	-3.673	–
Liu & Pang	2019	95.183	-7.291	1.014	0.383	-3.649	–
Bossini et al.	2019	95.199	-7.277	–	–	–	–
Soubiran et al.	2018	95.199	-7.277	–	–	–	-2.48
Bica et al.	2019	95.214	-7.275	–	–	–	–
Cantat-Gaudin et al.	2018	95.199	-7.277	1.021	0.436	-3.673	–
Loktin & Popova	2017	95.205	-7.282	–	1.41	-6.21	-10.7
Kharchenko et al.	2016	95.213	-7.294	–	–	–	–
Dias et al.	2014	95.204	-7.283	–	1.1	-5.59	–
Kharchenko et al.	2013	95.22	-7.295	–	1.53	-5.57	-10.7
Gozha et al.	2012	95.204	-7.283	–	–	–	–
Piskunov et al.	2008	95.205	-7.279	–	–	–	–
van den Bergh	2006	95.2	-7.283	–	–	–	–
Kharchenko et al.	2005	95.2	-7.28	–	2.44	-5.59	–
Kharchenko et al.	2003	95.25	-7.28	–	2.7	-4.84	–
Dias et al.	2002	95.204	-7.283	–	1.41	-6.21	-10.74

💡 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–	0.955	0.81	0.65	580	-0.048	371	0.53	0.0
Li et al.	2025	0.93	0.65	–	714	0.074	–	–	–
Hu & Soubiran	2025	–	–	–	–	-0.190⁽⁵⁾	–	–	–
Almeida et al.	2025	0.90	0.66	–	752	–	297	–	–
Alfonso et al.	2024	0.98	0.47	–	840	0.052	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	436⁽¹⁾	–	–
Cavallo et al.	2024	0.97	0.69	–	550	0.400	–	–	–
Hunt & Reffert	2023	0.91	0.58	0.65	450	–	–	–	–
Almeida et al.	2023	0.92	0.79	–	656	-0.048	371⁽¹⁾	0.53	–
Just et al.	2023	–	–	–	355	–	188	–	–
He et al.	2022	–	0.90	–	501	–	–	–	–
Tarricq et al.	2022	0.96	–	–	708	–	–	–	–
Jaehnig et al.	2021	0.95⁽¹⁾	–	–	–	–	–	–	–
Rain et al.	2021	0.95	0.81	–	708	–	–	–	0
Dias et al.	2021	0.90	0.66	–	752	0.051	–	–	–
Cantat-Gaudin et al.	2020	0.98	0.47	–	692	–	–	–	–
Cantat-Gaudin & Anders	2020	0.95	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	1180	-0.500	–	–	–
Bossini et al.	2019	0.93	0.86	–	611	-0.400	–	–	–
Soubiran et al.	2018	0.95	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	0.95	–	–	–	–	–	–	–
Loktin & Popova	2017	1.51	0.96	–	366	–	–	–	–
Kharchenko et al.	2016	1.14	1.10	–	355	–	–	–	–
Kharchenko et al.	2013	1.14	1.10	–	355	–	–	–	–
Gozha et al.	2012	1.29	–	–	234	–	490	–	–
Piskunov et al.	2008	1.29	0.93	–	269	–	–	–	–
van den Bergh	2006	1.29	0.93	–	234	–	–	–	–
Kharchenko et al.	2005	1.29	0.93	–	269	–	–	–	–
Kharchenko et al.	2003	1.30	0.93	–	–	–	–	–	–
Dias et al.	2002	0.79	0.81	–	708	-0.400	–	–	–

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

Visualization

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