Alessi Teutsch 8

(ASCC 68; MWSC 1993; AT 8; FoF 2239)

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0.90 UTI
0.83
CN
1.0
Cdens
1.0
CC3
0.84
Clit
1.0
Cdup
N50 (P>50% members) 317
Stellar density (N50/rad) 22.9 [N/pc2]
C3 classification AA
  • CN 0.83 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.84 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 Teutsch 8 is a rich, very dense object of very high C3 quality. Its parallax locates it at a relatively close distance, near 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 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.

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).

Richer et al. (2021)
The expected number of WDs is 23.2, 0 WD candidates found, and 0 WD candidates found in the wide search.

Bica et al. (2019)
Web updates in DAML02, some were later removed (2003 to 2010). List of clusters and alike reported by B. Alessi. The Preliminary Amateur Open Cluster Catalog, Version 08/03/2003.

Data
🔍 Search references for Alessi Teutsch 8 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– 180.663 -60.939 0.985 -6.642 1.666 -18.849
Li et al. 2025 180.649 -60.935 0.967 -6.625 1.63 –
Wei et al. 2025 180.635 -60.935 0.99 -6.645 1.681 –
Almeida et al. 2025 180.649 -60.948 – – – –
Hunt & Reffert 2024 180.703 -60.953 0.989 -6.645 1.672 -23.68
Cavallo et al. 2024 180.672 -60.955 0.989 – – –
Hunt & Reffert 2023 180.703 -60.953 0.989 -6.645 1.672 -23.68
Just et al. 2023 180.703 -60.917 – – – –
He et al. 2022 180.662 -60.938 0.991 -6.64 1.681 –
Tarricq et al. 2022 180.671 -60.902 0.982 -6.647 1.667 –
Richer et al. 2021 180.634 -60.895 0.957 -6.626 1.617 –
Dias et al. 2021 180.649 -60.948 0.971 -6.629 1.636 -15.38
Cantat-Gaudin et al. 2020 180.649 -60.935 0.967 -6.625 1.63 –
Cantat-Gaudin & Anders 2020 180.649 -60.935 0.967 -6.625 1.63 –
Liu & Pang 2019 180.66 -60.94 0.972 -6.611 1.627 –
Soubiran et al. 2018 180.649 -60.935 – – – -15.35
Bica et al. 2019 180.73 -60.928 – – – –
Cantat-Gaudin et al. 2018 180.649 -60.935 0.967 -6.625 1.63 –
Dib et al. 2018 180.712 -60.92 – – – –
Loktin & Popova 2017 180.735 -60.924 – -3.579 -1.817 –
Sampedro et al. 2017 180.729 -60.925 -4.61 -0.53 – –
Joshi et al. 2016 180.712 -60.92 – – – –
Kharchenko et al. 2016 180.703 -60.917 – – – –
Dias et al. 2014 180.729 -60.925 – -4.71 -0.11 –
Kharchenko et al. 2013 180.712 -60.92 – -4.63 3.0 –
Piskunov et al. 2008 180.733 -60.919 – – – –
Kharchenko et al. 2005 180.73 -60.92 – -4.81 3.71 –
Dias et al. 2002 180.729 -60.925 – -4.71 -0.11 –

💡 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– 0.955 0.49 0.78 200 0.250 847 0.33 –
Li et al. 2025 0.95 0.49 – 305 0.050 – – –
Wei et al. 2025 1.74 0.94 – 100 0.500 847 0.33 –
Almeida et al. 2025 0.97 0.63 – 190 – 882 – –
Hunt & Reffert 2024 – – – – – 1184(1) – –
Cavallo et al. 2024 0.98 0.47 – 372 0.400 – – –
Hunt & Reffert 2023 0.95 0.48 0.78 134 – – – –
Just et al. 2023 – – – 398 – 251 – –
He et al. 2022 – 0.85 – 79 – – – –
Tarricq et al. 2022 0.96 – – 115 – – – –
Richer et al. 2021 – 0.68 – 200 – – – –
Dias et al. 2021 0.97 0.63 – 190 0.154 – – –
Cantat-Gaudin et al. 2020 0.99 0.49 – 117 – – – –
Kounkel et al. 2020 1.01 0.67 – 89 – – – –
Cantat-Gaudin & Anders 2020 1.00 – – – – – – –
Liu & Pang 2019 – – – 93 0.250 – – –
Soubiran et al. 2018 1.00 – – – – – – –
Cantat-Gaudin et al. 2018 1.00 – – – – – – –
Dib et al. 2018 0.92 – – 398 – – – –
Loktin & Popova 2017 0.77 0.62 – 184 – – – –
Joshi et al. 2016 0.92 0.30 – 398 – 46 – –
Kharchenko et al. 2016 0.92 0.30 – 398 – – – –
Kharchenko et al. 2013 0.92 0.30 – 398 – – – –
Piskunov et al. 2008 0.65 0.32 – 447 – – – –
Kharchenko et al. 2005 0.65 0.32 – 447 – – – –
Dias et al. 2002 0.65 0.32 – 447 – – – –

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

Visualization
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Alessi Teutsch 8 UCC
Alessi Teutsch 8 HUNT23
Alessi Teutsch 8 CANTAT20
Galactocentric position diagram