Alessi 50

(DSH J0622.0+2104; FSR 0901)

0.65 UTI

0.8

C_N

1.0

C_dens

0.62

C_C3

0.4

C_lit

1.0

C_dup

N₅₀ (P>50% members) 239

Stellar density (N₅₀/rad) 20.2 [N/pc²]

C3 classification AC

C_N 0.8 Rich
C_dens 1.0 Very dense
C_C3 0.62 Intermediate quality
C_lit 0.4 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 50 is a rich, very dense object of intermediate 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, old 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 moderate percentage of members with a later reported entry. See table with shared members information.

Relatively close Moderate extinction Near-solar metallicity Old

Cavallo et al. (2024)
Gold sample.

Data

🔍 Search references for Alessi 50 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–	95.524	21.071	0.313	0.261	1.267	24.491
Hu & Soubiran	2025	95.523	21.077	–	–	–	–
Zhang et al.	2024	95.518	21.073	–	–	–	–
Hunt & Reffert	2024	95.518	21.073	0.301	0.267	1.275	22.436
Cavallo et al.	2024	95.523	21.077	0.302	–	–	–
Hunt & Reffert	2023	95.518	21.073	0.301	0.267	1.275	22.436
Bica et al.	2019	95.514	21.068	–	–	–	–
Kronberger et al.	2006	95.512	21.07	–	–	–	–

💡 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–	2.92	1.37	0.69	2312	-0.210	845	–	–
Hu & Soubiran	2025	–	–	–	–	-0.180⁽⁵⁾	–	–	–
Zhang et al.	2024	–	–	–	–	-0.496⁽¹⁾	–	–	–
Hunt & Reffert	2024	–	–	–	–	–	845⁽¹⁾	–	–
Cavallo et al.	2024	2.79	1.56	–	2692	-0.210	–	–	–
Hunt & Reffert	2023	3.05	1.18	0.69	1932	–	–	–	–

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

Cluster	%	RA	DEC	Plx	pmRA	pmDE	Rv	UTI
UBC 1307	39.3	95.52	21.07	0.29	0.26	1.29	25.0	0.0

💡 Note: The % column shows the percentage of members that Alessi 50 shares with each listed object.

Visualization

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