Alessi 43

(ASCC 50; MWSC 1579; FoF 2234)

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0.94 UTI
0.89
CN
1.0
Cdens
1.0
CC3
0.9
Clit
1.0
Cdup
Nm (P>50%) 462
Core radius and density 1.2 [pc], 13 [pc-2]
C3 classification AA
  • CN 0.89 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very 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 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.

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

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

Cavallo et al. (2024)
Silver sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.66 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.66 (50th percentile).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.4662, e_all=0.3734.

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

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

Data
🔍 Search references for Alessi 43 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– 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 –
Dib et al. 2018 132.592 -41.72 – – – –
Loktin & Popova 2017 132.57 -41.72 – -6.523 4.893 17.13
Sampedro et al. 2017 132.571 -41.72 – -4.47 2.99 –
Joshi et al. 2016 132.592 -41.72 – – – –
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 -0.075 617 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 0.90 1.13 2.34 4 – 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 – 0.25 – 30 – – – –
Dias et al. 2021 0.94 0.91 – 6 -0.051 – – –
Cantat-Gaudin et al. 2020 0.92 0.99 – 11 – – – –
Kounkel et al. 2020 1.00 1.32 – 4 – – – –
Cantat-Gaudin & Anders 2020 0.94 – – – – – – –
Liu & Pang 2019 – – – 11 -0.750 – – –
Dias et al. 2019 0.65 0.63 – 9 -0.705 – – –
Cantat-Gaudin et al. 2018 0.94 – – – – – – –
Dib et al. 2018 0.85 – – 63 – – – –
Loktin & Popova 2017 0.90 1.75 – 101 – – – –
Joshi et al. 2016 0.85 0.72 – 63 – 617 – –
Kharchenko et al. 2016 0.85 0.72 – 63 – – – –
Kharchenko et al. 2013 0.85 0.72 – 63 – – – –
Gozha et al. 2012 0.85 – – 30 – 617 – –
Piskunov et al. 2008 0.85 0.63 – 30 – – – –
Kharchenko et al. 2005 0.85 0.63 – 30 – – – –
Dias et al. 2002 0.85 0.63 – 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