Alessi 4

(MWSC 1786)

0.15 UTI

0.0

C_N

0.24

C_dens

0.0

C_C3

0.25

C_lit

1.0

C_dup

C3 classification DD

Number of members (P>50%) 22

Radius (P>50% members) 6.1 [arcmin]

C_N 0.0 Sparse
C_dens 0.24 Very loose
C_C3 0.0 Very low quality
C_lit 0.25 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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Alessi 4 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a moderate distance, well above the mid-plane, affected by moderate extinction. It is catalogued as an intermediate-age cluster (see Parameters). It is poorly studied in the literature.

⚠️ Warning: the low UTI value and no obvious signs of duplication (C_dup=1.0) indicate that this is quite probably an asterism, moving group, or artifact, and not a real open cluster.

Relatively close Moderate extinction Intermediate age

Dias et al. (2002)
Asterism (Alessi, B. S. et al. 2003, A&A 410, 565)

Data

🔍 Search references for Alessi 4 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	–	154.075	-34.324	0.415	-7.23	4.261	-0.493
Just et al.	2023	154.051	-34.356	–	–	–	–
Bica et al.	2019	154.051	-34.348	–	–	–	–
Kharchenko et al.	2016	154.051	-34.356	–	–	–	–
Kharchenko et al.	2013	154.057	-34.36	–	-10.65	4.48	–

💡 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]	Bfr	BSS
Just et al.	2023	–	–	–	355	–	307	–	–
Kharchenko et al.	2016	2.34	1.48	–	355	–	–	–	–
Kharchenko et al.	2013	2.34	1.48	–	355	–	–	–	–

Visualization

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