Alessi Teutsch 9

(ASCC 10; MWSC 275; AT 9)

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0.91 UTI
0.72
CN
0.95
Cdens
1.0
CC3
0.94
Clit
1.0
Cdup
N50 (P>50% members) 94
Stellar density (N50/rad) 4.8 [N/pc2]
C3 classification AA
  • CN 0.72 Moderately populated
  • Cdens 0.95 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.94 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 Teutsch 9 is a moderately populated, 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 and metallicity parameters (see Parameters). It is very well-studied in the literature.

Palma et al. (2025)
Classified as optical pair P261, along with NGC_1342.

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

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 7.6, 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.

Data
🔍 Search references for Alessi Teutsch 9 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 51.827 34.88 1.506 -1.78 -1.426 -18.531
Li et al. 2025 51.87 34.981 1.459 -1.737 -1.368 –
Almeida et al. 2025 51.874 35.011 – – – –
Alfonso et al. 2024 51.784 34.847 1.45 -1.816 -1.47 –
Zhang et al. 2024 51.863 34.886 – – – –
Hunt & Reffert 2024 51.863 34.886 1.507 -1.853 -1.359 -16.806
Cavallo et al. 2024 51.033 35.538 1.51 – – –
Hunt & Reffert 2023 51.863 34.886 1.507 -1.853 -1.359 -16.806
Almeida et al. 2023 51.906 35.011 – – – –
Just et al. 2023 51.756 35.028 – – – –
He et al. 2022 51.858 34.897 1.518 -1.779 -1.43 –
Tarricq et al. 2022 51.807 34.945 1.491 -1.839 -1.396 –
Richer et al. 2021 51.905 35.016 1.464 -1.659 -1.348 –
Dias et al. 2021 51.874 35.011 1.465 -1.704 -1.348 -10.87
Cantat-Gaudin et al. 2020 51.87 34.981 1.459 -1.737 -1.368 –
Zhong et al. 2020 51.87 34.981 – -1.737 -1.368 -27.205
Cantat-Gaudin & Anders 2020 51.87 34.981 1.459 -1.737 -1.368 –
Bossini et al. 2019 51.87 34.981 – – – –
Soubiran et al. 2018 51.87 34.981 – – – -15.67
Bica et al. 2019 51.864 34.947 – – – –
Cantat-Gaudin et al. 2018 51.87 34.981 1.459 -1.737 -1.368 –
Dib et al. 2018 51.765 35.03 – – – –
Sampedro et al. 2017 51.862 34.953 1.4 -1.93 – –
Joshi et al. 2016 51.765 35.03 – – – –
Kharchenko et al. 2016 51.756 35.028 – – – –
Dias et al. 2014 51.862 34.953 – 1.17 -2.05 –
Kharchenko et al. 2013 51.765 35.03 – -2.9 -1.6 –
Kharchenko et al. 2012 51.765 35.03 – -2.9 -1.6 –
Piskunov et al. 2008 51.739 35.034 – – – –
Kharchenko et al. 2005 51.75 35.04 – -3.08 -1.01 –
Dias et al. 2002 51.862 34.953 – -3.08 -1.01 –

💡 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– 0.67 0.63 1.09 385 0.002 207 0.45 –
Li et al. 2025 0.63 0.69 – 385 -0.041 – – –
Almeida et al. 2025 0.64 0.82 – 151 – 146 – –
Alfonso et al. 2024 0.66 0.63 – 368 0.109 – – –
Zhang et al. 2024 – – – – -0.016(1) – – –
Hunt & Reffert 2024 – – – – – 153(1) – –
Cavallo et al. 2024 0.67 0.89 – 95 0.300 – – –
Hunt & Reffert 2023 0.63 0.70 1.09 78 – – – –
Almeida et al. 2023 0.64 0.79 – 196 0.004 229(1) 0.45 –
Just et al. 2023 – – – 521 – 207 – –
He et al. 2022 – 0.75 – 79 – – – –
Tarricq et al. 2022 0.65 – – 263 – – – –
Richer et al. 2021 – 0.74 – 263 – – – –
Dias et al. 2021 0.64 0.82 – 151 0.109 – – –
Cantat-Gaudin et al. 2020 0.66 0.63 – 263 – – – –
Kounkel et al. 2020 0.66 0.80 – 186 – – – –
Zhong et al. 2020 0.67(1) 0.45 – 8599 -0.099 – – –
Cantat-Gaudin & Anders 2020 0.67 – – – – – – –
Bossini et al. 2019 0.61 0.44 – 397 0.000 – – –
Soubiran et al. 2018 0.67 – – – – – – –
Cantat-Gaudin et al. 2018 0.67 – – – – – – –
Dib et al. 2018 0.70 – – 521 – – – –
Joshi et al. 2016 0.70 0.32 – 521 – 316 – –
Kharchenko et al. 2016 0.70 0.32 – 521 – – – –
Kharchenko et al. 2013 0.70 0.32 – 521 – – – –
Kharchenko et al. 2012 0.70 0.32 – 521 – – – –
Piskunov et al. 2008 0.70 0.32 – 447 – – – –
Kharchenko et al. 2005 0.70 0.32 – 447 – – – –
Dias et al. 2002 0.70 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 9 UCC
Alessi Teutsch 9 HUNT23
Alessi Teutsch 9 CANTAT20
Galactocentric position diagram