Alessi 170

0.65 UTI

0.77

C_N

1.0

C_dens

0.75

C_C3

0.38

C_lit

1.0

C_dup

C3 classification AB

Number of members (P>50%) 146

Radius (P>50% members) 10.7 [arcmin]

C_N 0.77 Rich
C_dens 1.0 Very dense
C_C3 0.75 High quality
C_lit 0.38 Poorly studied
C_dup 1.0 Unique

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

Overview

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Alessi 170 is a rich, very dense object of high C3 quality. Its parallax locates it at a relatively 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 poorly studied in the literature.

Note: This object shares a significant percentage of members with a later reported entry. See table with shared members information.

Relatively close Low extinction Near-solar metallicity Intermediate age

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Alessi 170 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	–	100.454	-5.234	0.701	-0.116	-3.117	0.138
Hu & Soubiran	2025	100.444	-5.245	–	–	–	–
Zhang et al.	2024	100.456	-5.239	–	–	–	–
Hunt & Reffert	2024	100.456	-5.239	0.698	-0.108	-3.109	0.209
Cavallo et al.	2024	100.444	-5.245	0.701	–	–	–
Hunt & Reffert	2023	100.456	-5.239	0.698	-0.108	-3.109	0.209
Bica et al.	2019	100.469	-5.221	–	–	–	–

💡 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
Hu & Soubiran	2025	–	–	–	–	-0.140*	–	–	–
Zhang et al.	2024	–	–	–	–	-0.269*	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	573*	–	–
Cavallo et al.	2024	1.43	0.81	–	708	0.460	–	–	–
Hunt & Reffert	2023	1.33	0.74	0.62	542	–	–	–	–

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 215	54.1	100.44	-5.26	0.7	-0.11	-3.13	0.17	0.0

💡 Note: The % column shows the percentage of members that Alessi 170 shares with each listed object.

Visualization

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