Alessi 43

(ASCC 50; MWSC 1579; FoF 2234)

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0.98 UTI
0.89
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 462
Stellar density (N50/rad) 36.5 [N/pc2]
C3 classification AA
  • CN 0.89 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 43 is a rich, very dense object of very high C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, very young cluster, but with a large variance across recent sources for the absorption, age, and mass parameters (see Parameters). It is very well-studied in the literature.

Liu et al. (2025)
Classified as primordial binary cluster 23 along with Collinder_197, and as primordial binary cluster 31 along with BH_56, and of multiple system 11 along with Collinder_197 and BH_56.

Dias et al. (2002)
Part of OB association incl. Tr 10 (Alessi, B. S. 2005, private communication); cat V3.5 (Jan 2016)

Palma et al. (2025)
Classified as genetic pair P182, along with Collinder_197.

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg05' along with Collinder 197.

Cavallo et al. (2024)
Silver sample.

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

Data
🔍 Search references for Alessi 43 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 132.615 -41.724 1.047 -5.543 3.922 20.541
Liu et al. 2025 132.58 -41.69 1.06 -5.55 3.95 18.82
Wei et al. 2025 132.618 -41.748 1.057 -5.55 3.948 –
Almeida et al. 2025 132.641 -41.763 – – – –
Alfonso et al. 2024 132.631 -41.74 1.021 -5.548 3.912 –
Hunt & Reffert 2024 132.576 -41.692 1.061 -5.549 3.954 18.817
Celli et al. 2024 132.631 -41.738 – – – –
Cavallo et al. 2024 132.645 -41.72 1.06 – – –
Hunt & Reffert 2023 132.576 -41.692 1.061 -5.549 3.954 18.817
Just et al. 2023 132.587 -41.717 – – – –
He et al. 2022 132.609 -41.732 1.058 -5.573 3.925 –
Richer et al. 2021 131.908 -42.407 2.258 -12.344 6.501 –
Dias et al. 2021 132.641 -41.763 1.028 -5.501 3.847 22.806
Cantat-Gaudin et al. 2020 132.631 -41.738 1.032 -5.546 3.869 –
Cantat-Gaudin & Anders 2020 132.631 -41.738 1.032 -5.546 3.869 –
Liu & Pang 2019 132.635 -41.737 1.022 -5.559 3.91 –
Dias et al. 2019 132.571 -41.72 1.036 -5.472 3.931 67.87
Cantat-Gaudin et al. 2018 132.631 -41.738 1.032 -5.546 3.869 –
Loktin & Popova 2017 132.57 -41.72 – -6.523 4.893 17.13
Kharchenko et al. 2016 132.587 -41.717 – – – –
Dias et al. 2014 132.571 -41.72 – -4.61 3.23 –
Kharchenko et al. 2013 132.592 -41.72 – -6.55 4.91 17.1
Gozha et al. 2012 132.571 -41.72 – – – –
Piskunov et al. 2008 132.57 -41.716 – – – –
Kharchenko et al. 2007 132.57 -41.72 – 0.4 – 17.13
Kharchenko et al. 2005 132.57 -41.72 – -6.39 3.85 17.13
Dias et al. 2002 132.571 -41.72 – -6.39 3.85 17.13

💡 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– 0.9 0.91 2.34 12 -0.075 596 0.28 –
Liu et al. 2025 1.07 0.24 – 12 – – – –
Wei et al. 2025 1.00 1.24 – 4 0.000 665 0.28 –
Almeida et al. 2025 0.94 0.91 – 6 – 446 – –
Alfonso et al. 2024 0.88 0.98 – 10 -0.050 – – –
Hunt & Reffert 2024 – – – – – 717(1) – –
Celli et al. 2024 – – – 12 – 574 – –
Cavallo et al. 2024 0.99 1.24 – 4 -0.100 – – –
Hunt & Reffert 2023 0.90 1.13 2.34 4 – – – –
Just et al. 2023 – – – 63 – 73 – –
He et al. 2022 – 1.15 – 4 – – – –
Richer et al. 2021 – 0.24 – 30 – – – –
Dias et al. 2021 0.94 0.91 – 6 -0.051 – – –
Cantat-Gaudin et al. 2020 0.92 0.99 – 11 – – – –
Cantat-Gaudin & Anders 2020 0.94 – – – – – – –
Liu & Pang 2019 – – – 11 -0.750 – – –
Dias et al. 2019 0.65 0.62 – 9 -1.623 – – –
Cantat-Gaudin et al. 2018 0.94 – – – – – – –
Loktin & Popova 2017 0.90 1.72 – 101 – – – –
Kharchenko et al. 2016 0.85 0.71 – 63 – – – –
Kharchenko et al. 2013 0.85 0.71 – 63 – – – –
Gozha et al. 2012 0.85 – – 30 – 617 – –
Piskunov et al. 2008 0.85 0.62 – 30 – – – –
Kharchenko et al. 2005 0.85 0.62 – 30 – – – –
Dias et al. 2002 0.85 0.62 – 30 – – – –

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

Visualization
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Alessi 43 UCC
Alessi 43 HUNT23
Alessi 43 CANTAT20
Galactocentric position diagram