Alessi 8

(MWSC 2298)

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0.64 UTI
0.52
CN
0.3
Cdens
0.75
CC3
0.81
Clit
1.0
Cdup
Nm (P>50%) 54
Core radius and density 1.5 [pc], 1.5 [pc-2]
C3 classification AB
  • CN 0.52 Moderately populated
  • Cdens 0.3 Loose
  • CC3 0.75 High quality
  • Clit 0.81 Well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
Alessi 8 is a moderately populated, loose object of high C3 quality. Its parallax locates it at a close distance, above the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, intermediate-age cluster (see Parameters). It is well-studied in the literature.

Almeida et al. (2025)
Mass determination: intermediate fit. Isochrone match: good fit.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Richer et al. (2021)
The expected number of WDs is 1.6, 1 WD candidate found, and 2 WD candidates found in the wide search.

Hu et al. (2021)
Ellipticities (core, all): e_core=0.2401, e_all=0.0537.

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

Data
🔍 Search references for Alessi 8 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 232.399 -51.219 1.491 -5.942 -5.715 -29.546
Li et al. 2025 232.408 -51.227 1.479 -5.899 -5.729 –
Almeida et al. 2025 232.493 -51.196 – – – –
Alfonso et al. 2024 232.42 -51.18 1.434 -5.866 -5.633 –
Hunt & Reffert 2024 232.298 -51.312 1.482 -6.016 -5.702 -32.548
Cavallo et al. 2024 232.503 -51.174 1.489 – – –
Hunt & Reffert 2023 232.298 -51.312 1.482 -6.016 -5.702 -32.548
Almeida et al. 2023 232.515 -51.203 – – – –
He et al. 2022 232.276 -51.289 1.494 -6.029 -5.684 –
Tarricq et al. 2022 232.355 -51.212 1.494 -5.938 -5.683 –
Richer et al. 2021 232.624 -51.271 1.479 -5.914 -5.689 –
Dias et al. 2021 232.493 -51.196 1.479 -5.887 -5.736 -26.868
Cantat-Gaudin et al. 2020 232.408 -51.227 1.479 -5.899 -5.729 –
Cantat-Gaudin & Anders 2020 232.408 -51.227 1.479 -5.899 -5.729 –
Bossini et al. 2019 232.408 -51.227 – – – –
Soubiran et al. 2018 232.408 -51.227 – – – -27.26
Bica et al. 2019 232.393 -51.232 – – – –
Cantat-Gaudin et al. 2018 232.408 -51.227 1.479 -5.899 -5.729 –
Dib et al. 2018 232.365 -51.255 – – – –
Sampedro et al. 2017 232.387 -51.233 – -4.94 -4.64 –
Dias et al. 2014 232.388 -51.233 – -5.02 -4.58 –
Piskunov et al. 2008 232.384 -51.224 – – – –
Piskunov et al. 2007 232.384 -51.224 – – – –
van den Bergh 2006 232.375 -51.208 – – – –
Kharchenko et al. 2005 232.39 -51.23 – -6.05 -7.01 –
Alessi et al. 2003 232.375 -51.208 – -6.1 -5.8 –
Dias et al. 2002 232.387 -51.233 – -6.13 -5.8 –

💡 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] Bfrac BSS
UCC 99999– 0.655 0.28 0.62 123 0.035 113 0.51 –
Li et al. 2025 0.69 0.30 – 141 0.163 – – –
Almeida et al. 2025 0.67 0.38 – 143 – 113 – –
Alfonso et al. 2024 0.67 0.19 – 132 0.070 – – –
Hunt & Reffert 2024 0.63 0.27 0.62 101 – 71(1) – –
Cavallo et al. 2024 0.64 0.57 – 102 -0.020 – – –
Hunt & Reffert 2023 0.63 0.27 0.62 101 – – – –
Almeida et al. 2023 0.65 0.34 – 209 -0.051 163(1) 0.51 –
He et al. 2022 – 0.45 – 79 – – – –
Tarricq et al. 2022 0.66 – – 123 – – – –
Richer et al. 2021 – 0.36 – 100 – – – –
Dias et al. 2021 0.67 0.38 – 143 0.070 – – –
Cantat-Gaudin et al. 2020 0.67 0.19 – 117 – – – –
Kounkel et al. 2020 0.62 0.41 – 120 – – – –
Cantat-Gaudin & Anders 2020 0.66 – – – – – – –
Bossini et al. 2019 0.66 0.32 – 137 0.000 – – –
Soubiran et al. 2018 0.66 – – – – – – –
Cantat-Gaudin et al. 2018 0.66 – – – – – – –
Dib et al. 2018 0.71 – – 127 – – – –
Piskunov et al. 2008 0.57 0.28 – 83 – 176(1) – –
Piskunov et al. 2007 0.57 0.28 – 83 – 56 – –
van den Bergh 2006 0.57 0.28 – 141 – – – –
Kharchenko et al. 2005 0.57 0.28 – 83 – – – –
Alessi et al. 2003 0.57 0.28 – 141 – – – –
Dias et al. 2002 0.57 0.28 – 141 – – – –

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

Visualization
ℹī¸
Alessi 8 UCC
Alessi 8 HUNT23
Alessi 8 CANTAT20
Galactocentric position diagram