Alessi 6

(MWSC 2240; FoF 2277)

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0.87 UTI
0.81
CN
1.0
Cdens
0.75
CC3
0.9
Clit
1.0
Cdup
Nm (P>50%) 247
Core radius and density 1.8 [pc], 5.6 [pc-2]
C3 classification AB
  • CN 0.81 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 0.9 Very 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 6 is a rich, very dense object of high C3 quality. Its parallax locates it at a 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 age and metallicity parameters (see Parameters). It is very well-studied in the literature.

Palma et al. (2025)
Classified as optical pair P259, along with UPK_595.

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

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).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.0972, e_all=0.256.

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

Dias et al. (2002)
Asterism (Alessi, B. S. 2005, private communication); cat V3.5 (Jan 2016)

Data
🔍 Search references for Alessi 6 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– 220.063 -66.125 1.124 -10.534 -5.547 -14.369
Li et al. 2025 220.058 -66.127 1.1 -10.472 -5.559 –
Almeida et al. 2025 220.086 -66.136 – – – –
Alfonso et al. 2024 220.124 -66.126 1.089 -10.524 -5.516 –
Hunt & Reffert 2024 220.011 -66.137 1.126 -10.543 -5.535 -14.862
Cavallo et al. 2024 220.066 -66.102 1.13 – – –
Hunt & Reffert 2023 220.011 -66.137 1.126 -10.543 -5.535 -14.862
Almeida et al. 2023 220.006 -66.074 – – – –
Just et al. 2023 220.119 -66.118 – – – –
He et al. 2022 220.086 -66.123 1.133 -10.559 -5.531 –
Tarricq et al. 2022 219.968 -66.126 1.126 -10.529 -5.531 –
Jadhav & Subramaniam 2021 220.058 -66.127 – – – –
Richer et al. 2021 221.96 -66.43 2.326 -7.552 -10.301 –
Dias et al. 2021 220.086 -66.136 1.101 -10.483 -5.55 -14.197
Cantat-Gaudin et al. 2020 220.058 -66.127 1.1 -10.472 -5.559 –
Cantat-Gaudin & Anders 2020 220.058 -66.127 1.1 -10.472 -5.559 –
Liu & Pang 2019 220.086 -66.127 1.108 -10.512 -5.545 –
Bossini et al. 2019 220.058 -66.127 – – – –
Soubiran et al. 2018 220.058 -66.127 – – – -14.35
Bica et al. 2019 220.07 -66.12 – – – –
Cantat-Gaudin et al. 2018 220.058 -66.127 1.1 -10.472 -5.559 –
Dib et al. 2018 220.132 -66.12 – – – –
Joshi et al. 2016 220.132 -66.12 – – – –
Kharchenko et al. 2016 220.119 -66.118 – – – –
Kharchenko et al. 2013 220.132 -66.12 – -8.2 -5.9 9.2
Piskunov et al. 2008 220.038 -66.115 – – – –
Piskunov et al. 2007 220.038 -66.115 – – – –
van den Bergh 2006 220.05 -66.175 – – – –
Kharchenko et al. 2005 220.06 -66.12 – -6.2 -6.22 –
Alessi et al. 2003 220.05 -66.175 – -7.3 -4.3 –

💡 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– 0.83 0.675 0.6 360 0.073 326 0.57 0
Li et al. 2025 0.91 0.68 – 595 0.244 – – –
Almeida et al. 2025 0.86 0.88 – 610 – 414 – –
Alfonso et al. 2024 0.89 0.70 – 517 0.147 – – –
Hunt & Reffert 2024 0.83 0.67 0.60 366 – 496(1) – –
Cavallo et al. 2024 0.89 0.89 – 417 0.290 – – –
Hunt & Reffert 2023 0.83 0.67 0.60 366 – – – –
Almeida et al. 2023 0.86 1.23 – 421 -0.191 598(1) 0.57 –
Just et al. 2023 – – – 209 – 237 – –
He et al. 2022 – 1.10 – 355 – – – –
Tarricq et al. 2022 0.87 – – 447 – – – –
Jadhav & Subramaniam 2021 0.89 0.70 – 427 – 648 – 0(1)
Richer et al. 2021 – 0.47 – 30 – – – –
Dias et al. 2021 0.86 0.88 – 610 0.148 – – –
Cantat-Gaudin et al. 2020 0.89 0.70 – 427 – – – –
Kounkel et al. 2020 0.83 0.91 – 380 – – – –
Cantat-Gaudin & Anders 2020 0.89 – – – – – – –
Liu & Pang 2019 – – – 347 0.000 – – –
Bossini et al. 2019 0.81 0.72 – 598 -0.382 – – –
Soubiran et al. 2018 0.89 – – – – – – –
Cantat-Gaudin et al. 2018 0.89 – – – – – – –
Dib et al. 2018 0.61 – – 209 – – – –
Joshi et al. 2016 0.61 0.60 – 209 – 63 – –
Kharchenko et al. 2016 0.61 0.60 – 209 – – – –
Kharchenko et al. 2013 0.61 0.60 – 209 -0.154 – – –
Piskunov et al. 2008 0.44 0.60 – 200 – 64(1) – –
Piskunov et al. 2007 0.44 0.60 – 200 – 19 – –
van den Bergh 2006 0.44 0.60 – 158 – – – –
Kharchenko et al. 2005 0.44 0.60 – 200 – – – –
Alessi et al. 2003 0.44 0.60 – 158 – – – –

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

Visualization
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Alessi 6 UCC
Alessi 6 HUNT23
Alessi 6 CANTAT20
Galactocentric position diagram