Alessi 12

(MWSC 3404; LeDrew 2; FoF 2391)

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0.97 UTI
0.83
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 303
Stellar density (N50/rad) 13.8 [N/pc2]
C3 classification AA
  • CN 0.83 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 1.0 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 12 is a rich, very dense object of very 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, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Alessi 12 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 310.883 23.786 1.838 4.317 -4.702 1.659
Li et al. 2025 310.875 23.871 1.816 4.303 -4.639 –
Wei et al. 2025 310.848 23.812 1.838 4.315 -4.7 –
Almeida et al. 2025 310.903 23.897 – – – –
Alfonso et al. 2024 310.848 23.833 1.801 4.273 -4.677 –
Hunt & Reffert 2024 310.871 23.538 1.843 4.277 -4.702 1.244
Cavallo et al. 2024 310.902 23.873 1.834 – – –
Hunt & Reffert 2023 310.871 23.538 1.843 4.277 -4.702 1.244
Almeida et al. 2023 310.845 23.933 – – – –
Cordoni et al. 2023 310.903 23.897 1.825 4.329 -4.648 –
Just et al. 2023 310.839 23.782 – – – –
He et al. 2022 310.911 23.797 1.837 4.315 -4.701 –
Tarricq et al. 2022 310.771 23.978 1.824 4.333 -4.701 –
Dias et al. 2021 310.903 23.897 1.825 4.329 -4.648 -3.374
Cantat-Gaudin et al. 2020 310.875 23.871 1.816 4.303 -4.639 –
Cantat-Gaudin & Anders 2020 310.875 23.871 1.816 4.303 -4.639 –
Liu & Pang 2019 310.945 23.859 1.828 4.358 -4.645 –
Bossini et al. 2019 310.875 23.871 – – – –
Soubiran et al. 2018 310.875 23.871 – – – 2.43
Bica et al. 2019 310.873 23.777 – – – –
Cantat-Gaudin et al. 2018 310.875 23.871 1.816 4.303 -4.639 –
Loktin & Popova 2017 310.95 23.792 – 4.33 -5.35 -26.0
Kharchenko et al. 2016 310.839 23.782 – – – –
Dias et al. 2014 310.95 23.792 – 0.82 -2.65 –
Kharchenko et al. 2013 310.845 23.785 – 3.33 -5.28 -26.0
Gozha et al. 2012 310.95 23.792 – – – –
Piskunov et al. 2008 310.873 23.777 – – – –
Kharchenko et al. 2007 310.95 23.79 – 0.5 – -26.0
Piskunov et al. 2007 310.873 23.777 – – – –
van den Bergh 2006 310.829 23.775 – – – –
Kharchenko et al. 2005 310.87 23.78 – 3.75 -4.66 –
Alessi et al. 2003 310.827 23.775 – 4.3 -5.3 –
Dias et al. 2002 310.95 23.792 – 4.33 -5.35 -26.0

💡 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– 0.54 0.25 0.92 123 0.000 416 0.23 0.0
Li et al. 2025 0.57 0.29 – 107 -0.041 – – –
Wei et al. 2025 0.68 0.37 – 62 0.500 319 0.22 –
Almeida et al. 2025 0.54 0.25 – 157 – 416 – –
Alfonso et al. 2024 0.53 0.10 – 133 -0.020 – – –
Hunt & Reffert 2024 – – – – – 471(1) – –
Cavallo et al. 2024 0.56 0.47 – 74 0.040 – – –
Hunt & Reffert 2023 0.52 0.14 0.92 122 – – – –
Almeida et al. 2023 0.53 0.27 – 234 0.003 485(1) 0.48 –
Cordoni et al. 2023 0.54 0.25 – 157 -0.023 526 0.23 0.00
Just et al. 2023 – – – 29 – 87 – –
He et al. 2022 – 0.35 – 79 – – – –
Tarricq et al. 2022 0.54 – – 138 – – – –
Dias et al. 2021 0.54 0.25 – 157 -0.023 – – –
Cantat-Gaudin et al. 2020 0.54 0.10 – 135 – – – –
Cantat-Gaudin & Anders 2020 0.54 – – – – – – –
Liu & Pang 2019 – – – 83 0.000 – – –
Bossini et al. 2019 0.50 0.21 – 123 0.000 – – –
Soubiran et al. 2018 0.54 – – – – – – –
Cantat-Gaudin et al. 2018 0.54 – – – – – – –
Loktin & Popova 2017 1.11 0.54 – 238 – – – –
Kharchenko et al. 2016 0.54 0.24 – 29 – – – –
Kharchenko et al. 2013 0.54 0.24 – 29 – – – –
Gozha et al. 2012 0.54 – – 126 – 372 – –
Piskunov et al. 2008 0.54 0.25 – 79 – 545(1) – –
Piskunov et al. 2007 0.54 0.25 – 79 – 260 – –
van den Bergh 2006 0.54 0.25 – 126 – – – –
Kharchenko et al. 2005 0.54 0.25 – 79 – – – –
Alessi et al. 2003 0.54 0.25 – 126 – – – –
Dias et al. 2002 0.54 0.25 – 126 – – – –

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

Visualization
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Alessi 12 UCC
Alessi 12 HUNT23
Alessi 12 CANTAT20
Galactocentric position diagram