Alessi 55

(FSR 1080; MWSC 1038)

0.14 UTI

0.0

C_N

0.05

C_dens

0.12

C_C3

0.26

C_lit

1.0

C_dup

N_m (P>50%) 18

Core radius and density 2.0 [pc], 0.2 [pc^-2]

C3 classification CD

C_N 0.0 Sparse
C_dens 0.05 Very loose
C_C3 0.12 Very low quality
C_lit 0.26 Poorly studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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Alessi 55 is a sparse, very loose object of very low C3 quality. Its parallax locates it at a moderate^* distance, 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.

(*): The parallax distance estimate (~2.65 kpc) differs significantly from the median photometric distance (~1.75 kpc).

⚠️ 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

Bica et al. (2019)
List of clusters and alike reported by B. Alessi.

Data

🔍 Search references for Alessi 55 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–	104.546	0.88	0.378	-1.052	1.973	–
Just et al.	2023	104.558	0.885	–	–	–	–
Bica et al.	2019	104.572	0.868	–	–	–	–
Dib et al.	2018	104.565	0.884	–	–	–	–
Sampedro et al.	2017	104.567	0.865	–	-0.35	2.41	–
Joshi et al.	2016	104.565	0.884	–	–	–	–
Kharchenko et al.	2016	104.558	0.885	–	–	–	–
Dias et al.	2014	104.567	0.865	–	0.27	-0.15	–
Kharchenko et al.	2013	104.565	0.884	–	-1.99	-4.54	–
Froebrich et al.	2007	104.567	0.865	–	–	–	–
Dias et al.	2002	104.567	0.865	–	-1.99	-4.54	–

💡 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–	1.75	1.77	–	234	–	104	–	–
Just et al.	2023	–	–	–	234	–	104	–	–
Dib et al.	2018	1.75	–	–	234	–	–	–	–
Joshi et al.	2016	1.75	1.77	–	234	–	–	–	–
Kharchenko et al.	2016	1.75	1.77	–	234	–	–	–	–
Kharchenko et al.	2013	1.75	1.77	–	234	–	–	–	–
Dias et al.	2002	1.75	1.77	–	234	–	–	–	–

Visualization

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