Alessi 17

(MWSC 1271)

0.51 UTI

0.35

C_N

0.22

C_dens

0.75

C_C3

0.61

C_lit

1.0

C_dup

N_m (P>50%) 35

Core radius and density 2.6 [pc], 1.1 [pc^-2]

C3 classification AB

C_N 0.35 Poorly populated
C_dens 0.22 Very loose
C_C3 0.75 High quality
C_lit 0.61 Moderately studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

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

Overview

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Alessi 17 is a poorly populated, very loose object of high C3 quality. Its parallax locates it at a moderate distance, above the mid-plane, affected by moderate extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster, but with a large variance across recent sources for the age and metallicity parameters (see Parameters). It is moderately studied in the literature.

Distant Moderate extinction Near-solar metallicity Intermediate age

Almeida et al. (2025)
Mass determination: invalid due to poor quality CMD. Isochrone match: worst fit.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 1.00 (50th percentile).

Bica et al. (2019)
Web updates in DAML02, some were later removed (2003 to 2010). List of clusters and alike reported by B. Alessi. Asterisms and cluster alikes by B. Alessi reported in DAML02.

Dias et al. (2002)
Asterism (Kronberger, M. 2005, private communication); cat V3.5 (Jan 2016)

Data

🔍 Search references for Alessi 17 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–	113.853	-15.097	0.231	-1.492	1.552	66.026
Li et al.	2025	113.853	-15.098	0.264	-1.526	1.557	–
Almeida et al.	2025	113.853	-15.092	–	–	–	–
Hunt & Reffert	2024	113.852	-15.098	0.215	-1.456	1.574	–
Cavallo et al.	2024	113.835	-15.094	0.216	–	–	–
Hunt & Reffert	2023	113.852	-15.098	0.215	-1.456	1.574	–
Just et al.	2023	113.844	-15.089	–	–	–	–
Dias et al.	2021	113.853	-15.092	0.262	-1.554	1.558	–
Cantat-Gaudin et al.	2020	113.853	-15.098	0.264	-1.526	1.557	–
Cantat-Gaudin & Anders	2020	113.853	-15.098	0.264	-1.526	1.557	–
Soubiran et al.	2018	113.853	-15.098	–	–	–	70.21
Bica et al.	2019	113.845	-15.093	–	–	–	–
Cantat-Gaudin et al.	2018	113.853	-15.098	0.264	-1.526	1.557	–
Kharchenko et al.	2016	113.844	-15.089	–	–	–	–
Kharchenko et al.	2013	113.85	-15.092	–	-3.36	-0.75	–

💡 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–	3.86	1.26	0.87	240	-0.138	327	–	–
Li et al.	2025	4.42	1.26	–	309	-0.044	–	–	–
Almeida et al.	2025	3.72	0.81	–	897	–	147	–	–
Hunt & Reffert	2024	4.27	0.89	0.87	240	–	327⁽¹⁾	–	–
Cavallo et al.	2024	3.50	1.35	–	282	-0.480	–	–	–
Hunt & Reffert	2023	4.27	0.89	0.87	240	–	–	–	–
Just et al.	2023	–	–	–	166	–	445	–	–
Dias et al.	2021	3.72	0.81	–	897	-0.138	–	–	–
Kounkel et al.	2020	4.00	1.48	–	123	–	–	–	–
Cantat-Gaudin & Anders	2020	3.42	–	–	–	–	–	–	–
Soubiran et al.	2018	3.42	–	–	–	–	–	–	–
Cantat-Gaudin et al.	2018	3.42	–	–	–	–	–	–	–
Kharchenko et al.	2016	4.70	1.38	–	166	–	–	–	–
Kharchenko et al.	2013	4.70	1.38	–	166	–	–	–	–

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

Visualization

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