Alessi 3

(MWSC 1157; FoF 2434; OCSN 137)

0.96 UTI

0.81

C_N

1.0

C_dens

1.0

C_C3

1.0

C_lit

1.0

C_dup

N₅₀ (P>50% members) 268

Stellar density (N₅₀/rad) 9.5 [N/pc²]

C3 classification AA

C_N 0.81 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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Alessi 3 is a rich, very dense object of very high C3 quality. Its parallax locates it at a very close distance, below the mid-plane, affected by low extinction. It is catalogued as a low-mass, near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the absorption and metallicity parameters (see Parameters). It is very well-studied in the literature.

Very close Low extinction Low mass Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Alessi 3 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–	109.169	-46.255	3.573	-9.817	11.954	0.451
Li et al.	2025	109.275	-46.142	3.566	-9.875	11.958	–
Wei et al.	2025	109.212	-46.186	3.611	-9.789	11.957	–
Almeida et al.	2025	109.7	-46.026	–	–	–	–
Alfonso et al.	2024	109.291	-46.194	3.562	-9.852	11.847	–
Hunt & Reffert	2024	109.187	-46.68	3.575	-9.793	11.916	0.317
Cavallo et al.	2024	109.175	-46.154	3.575	–	–	–
Hunt & Reffert	2023	109.187	-46.68	3.575	-9.793	11.916	0.317
Qin et al.	2023	109.18	-46.3	3.59	-9.72	11.92	0.58
Just et al.	2023	109.046	-46.615	–	–	–	–
He et al.	2022	109.09	-46.308	3.611	-9.82	11.958	–
Tarricq et al.	2022	109.341	-46.348	3.619	-9.774	11.954	–
Dias et al.	2021	109.7	-46.026	3.559	-9.872	12.014	2.314
Cantat-Gaudin et al.	2020	109.275	-46.142	3.566	-9.875	11.958	–
Cantat-Gaudin & Anders	2020	109.275	-46.142	3.566	-9.875	11.958	–
Liu & Pang	2019	108.974	-46.05	3.558	-9.829	11.977	–
Soubiran et al.	2018	109.275	-46.142	–	–	–	0.2
Bica et al.	2019	109.086	-46.61	–	–	–	–
Cantat-Gaudin et al.	2018	109.275	-46.142	3.566	-9.875	11.958	–
Angelo et al.	2019	109.138	-46.675	–	–	–	–
Yen et al.	2018	109.036	-46.559	3.81	-9.74	12.13	–
Loktin & Popova	2017	109.125	-46.685	–	-1.203	5.537	20.0
Kharchenko et al.	2016	109.046	-46.615	–	–	–	–
Dias et al.	2014	109.121	-46.685	–	-0.4	5.12	–
Kharchenko et al.	2013	109.05	-46.617	–	-11.09	12.72	20.0
Gozha et al.	2012	109.121	-46.685	–	–	–	–
Piskunov et al.	2008	109.086	-46.61	–	–	–	–
Kharchenko et al.	2007	109.12	-46.69	–	0.55	–	20.0
Piskunov et al.	2007	109.086	-46.61	–	–	–	–
van den Bergh	2006	109.1	-46.6	–	–	–	–
Kharchenko et al.	2005	109.08	-46.61	–	-11.63	12.61	–
Alessi et al.	2003	109.1	-46.6	–	-11.5	12.4	–
Dias et al.	2002	109.121	-46.685	–	-11.49	12.37	20.0

💡 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–	0.29	0.31	0.43	723	-0.001	44	0.53	–
Li et al.	2025	0.29	0.06	–	946	0.055	–	–	–
Wei et al.	2025	0.26	0.04	–	832	0.250	195	0.53	–
Almeida et al.	2025	0.28	0.18	–	798	–	122	–	–
Alfonso et al.	2024	0.30	0.14	–	720	-0.056	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	59⁽¹⁾	–	–
Cavallo et al.	2024	0.29	0.32	–	427	0.440	–	–	–
Hunt & Reffert	2023	0.27	0.11	0.43	625	–	–	–	–
Qin et al.	2023	0.27	0.06	–	891	–	–	–	–
Just et al.	2023	–	–	–	741	–	29	–	–
He et al.	2022	–	0.50	–	398	–	–	–	–
Tarricq et al.	2022	0.29	–	–	631	–	–	–	–
Dias et al.	2021	0.28	0.18	–	798	-0.057	–	–	–
Cantat-Gaudin et al.	2020	0.30	0.14	–	631	–	–	–	–
Cantat-Gaudin & Anders	2020	0.28	–	–	–	–	–	–	–
Liu & Pang	2019	–	–	–	437	0.250	–	–	–
Soubiran et al.	2018	0.28	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	0.28	–	–	–	–	–	–	–
Angelo et al.	2019	0.26	–	–	630	–	18	–	–
Yen et al.	2018	0.26	0.11	–	794	–	–	–	–
Loktin & Popova	2017	0.43	0.30	–	723	–	–	–	–
Kharchenko et al.	2016	0.31	0.34	–	741	–	–	–	–
Kharchenko et al.	2013	0.31	0.34	–	741	-0.275	–	–	–
Gozha et al.	2012	0.29	–	–	501	–	37	–	–
Piskunov et al.	2008	0.29	0.34	–	741	–	52⁽¹⁾	–	–
Piskunov et al.	2007	0.29	0.34	–	741	–	31	–	–
van den Bergh	2006	0.29	0.34	–	501	–	–	–	–
Kharchenko et al.	2005	0.29	0.34	–	741	–	–	–	–
Alessi et al.	2003	0.29	0.34	–	501	–	–	–	–
Dias et al.	2002	0.29	0.34	–	501	-0.275	–	–	–

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

Visualization

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