Alessi 6

(MWSC 2240; FoF 2277)

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0.91 UTI
0.81
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 247
Radius (P>50% members) 13.4 [arcmin]
  • CN 0.81 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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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 metallicity parameter (see Parameters). It is very well-studied in the literature.
Close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Dias et al. (2002)
Asterism (Alessi, B. S. 2005, private communication)

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 – 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 –
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 –
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] Bfr BSS
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 – – – – – 496* – –
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* 0.57 –
Just et al. 2023 – – – 209 – 237 – –
He et al. 2022 – 1.10 – 355 – – – –
Tarricq et al. 2022 0.87 – – 447 – – – –
Dias et al. 2021 0.86 0.88 – 610 0.148 – – –
Cantat-Gaudin et al. 2020 0.89 0.70 – 427 – – – –
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 – – – – – – –
Kharchenko et al. 2016 0.61 0.59 – 209 – – – –
Kharchenko et al. 2013 0.61 0.59 – 209 -0.154 – – –
Piskunov et al. 2008 0.44 0.59 – 200 – 64* – –
Piskunov et al. 2007 0.44 0.59 – 200 – 19 – –
van den Bergh 2006 0.44 0.59 – 158 – – – –
Kharchenko et al. 2005 0.44 0.59 – 200 – – – –
Alessi et al. 2003 0.44 0.59 – 158 – – – –

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

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