Alessi 33

(ASCC 32; MWSC 1069; FoF 2271)

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0.96 UTI
0.79
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 210
Stellar density (N50/rad) 11.1 [N/pc2]
C3 classification AA
  • CN 0.79 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 33 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, young cluster, but with a large variance across recent sources for the age and mass parameters (see Parameters). It is very well-studied in the literature.

Note: This object shares a large percentage of members with 3 later reported entries. See table with shared members information.

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Alessi 33 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 105.744 -26.477 1.252 -3.228 3.502 33.096
Li et al. 2025 105.714 -26.512 1.23 -3.307 3.477 –
Almeida et al. 2025 105.711 -26.576 – – – –
Alfonso et al. 2024 105.768 -26.563 1.21 -3.201 3.484 –
Hunt & Reffert 2024 105.71 -26.365 1.249 -3.218 3.488 34.107
Celli et al. 2024 105.714 -26.512 – – – –
Cavallo et al. 2024 105.761 -26.431 1.246 – – –
Hunt & Reffert 2023 105.71 -26.365 1.249 -3.218 3.488 34.107
Cordoni et al. 2023 105.711 -26.576 1.24 -3.317 3.475 –
Just et al. 2023 105.52 -26.558 – – – –
He et al. 2022 105.703 -26.169 1.233 -3.218 3.456 –
Dias et al. 2021 105.711 -26.576 1.24 -3.317 3.475 34.607
Cantat-Gaudin et al. 2020 105.714 -26.512 1.23 -3.307 3.477 –
Cantat-Gaudin & Anders 2020 105.714 -26.512 1.23 -3.307 3.477 –
Liu & Pang 2019 105.742 -26.363 1.219 -3.264 3.461 –
Bossini et al. 2019 105.714 -26.512 – – – –
Soubiran et al. 2018 105.714 -26.512 – – – 35.05
Bica et al. 2019 105.499 -26.499 – – – –
Cantat-Gaudin et al. 2018 105.714 -26.512 1.23 -3.307 3.477 –
Loktin & Popova 2017 105.495 -26.503 – -0.768 0.813 –
Kharchenko et al. 2016 105.52 -26.558 – – – –
Dias et al. 2014 105.496 -26.503 – -1.47 2.32 –
Kharchenko et al. 2013 105.525 -26.56 – -2.33 4.25 –
Piskunov et al. 2008 105.489 -26.503 – – – –
Piskunov et al. 2007 105.489 -26.503 – – – –
Kharchenko et al. 2005 105.49 -26.5 – -3.39 1.97 –
Dias et al. 2002 105.496 -26.503 – -1.47 2.32 –

💡 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– 0.79 0.24 0.73 27 -0.003 380 0.36 0.0
Li et al. 2025 0.77 0.17 – 24 -0.043 – – –
Almeida et al. 2025 0.79 0.22 – 27 – 697 – –
Alfonso et al. 2024 0.81 0.26 – 24 -0.003 – – –
Hunt & Reffert 2024 – – – – – 272(1) – –
Celli et al. 2024 – – – 25 – 560 – –
Cavallo et al. 2024 0.84 0.44 – 6 -0.280 – – –
Hunt & Reffert 2023 0.78 0.14 0.73 16 – – – –
Cordoni et al. 2023 0.79 0.22 – 27 -0.003 2417 0.36 0.00
Just et al. 2023 – – – 164 – 220 – –
He et al. 2022 – 0.10 – 18 – – – –
Dias et al. 2021 0.79 0.22 – 27 -0.003 – – –
Cantat-Gaudin et al. 2020 0.81 0.26 – 25 – – – –
Cantat-Gaudin & Anders 2020 0.79 – – – – – – –
Liu & Pang 2019 – – – 19 -0.750 – – –
Bossini et al. 2019 0.73 0.22 – 25 0.000 – – –
Soubiran et al. 2018 0.79 – – – – – – –
Cantat-Gaudin et al. 2018 0.79 – – – – – – –
Loktin & Popova 2017 0.79 0.23 – 155 – – – –
Kharchenko et al. 2016 0.77 0.24 – 164 – – – –
Kharchenko et al. 2013 0.77 0.24 – 164 – – – –
Piskunov et al. 2008 0.75 0.25 – 151 – 380(1) – –
Piskunov et al. 2007 0.75 0.25 – 151 – 158 – –
Kharchenko et al. 2005 0.75 0.25 – 151 – – – –
Dias et al. 2002 0.75 0.25 – 151 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWWDL 14294 94.8 105.75 -26.5 1.26 -3.22 3.51 32.7 0.06
OC 0408 6.2 105.12 -26.51 1.22 -3.22 3.55 34.95 0.09
OC 0410 3.3 105.73 -27.38 1.2 -3.1 3.48 35.18 0.13

💡 Note: The % column shows the percentage of members that Alessi 33 shares with each listed object.

Visualization
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Alessi 33 UCC
Alessi 33 HUNT23
Alessi 33 CANTAT20
Galactocentric position diagram