Alessi 10

(MWSC 3242; LeDrew 3; OCSN 140)

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0.96 UTI
0.78
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 192
Radius (P>50% members) 24.5 [arcmin]
  • CN 0.78 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 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
ℹī¸
Alessi 10 is a rich, very dense object of very high C3 quality. Its parallax locates it at a very 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, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

Note: This object shares a moderate percentage of members with a later reported entry. See table with shared members information.

Very close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Alessi 10 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC – 301.254 -10.546 2.257 1.476 -7.884 -15.442
Li et al. 2025 301.233 -10.555 2.233 1.469 -7.879 –
Almeida et al. 2025 301.206 -10.545 – – – –
Alfonso et al. 2024 301.252 -10.533 2.226 1.477 -7.884 –
Hunt & Reffert 2024 301.232 -10.529 2.219 1.454 -7.902 -17.601
Cavallo et al. 2024 301.18 -10.516 2.241 – – –
Hunt & Reffert 2023 301.232 -10.529 2.219 1.454 -7.902 -17.601
Almeida et al. 2023 301.247 -10.518 – – – –
Qin et al. 2023 301.24 -10.5 2.27 1.45 -7.94 -16.23
Just et al. 2023 301.174 -10.487 – – – –
He et al. 2022 301.229 -10.524 2.26 1.447 -7.898 –
Tarricq et al. 2022 301.231 -10.522 2.273 1.462 -7.885 –
Dias et al. 2021 301.206 -10.545 2.225 1.458 -7.846 -12.671
Cantat-Gaudin et al. 2020 301.233 -10.555 2.233 1.469 -7.879 –
Cantat-Gaudin & Anders 2020 301.233 -10.555 2.233 1.469 -7.879 –
Bossini et al. 2019 301.233 -10.555 – – – –
Soubiran et al. 2018 301.233 -10.555 – – – -13.57
Bica et al. 2019 301.191 -10.482 – – – –
Cantat-Gaudin et al. 2018 301.233 -10.555 2.233 1.469 -7.879 –
Loktin & Popova 2017 301.185 -10.479 – 1.651 -6.04 75.9
Kharchenko et al. 2016 301.174 -10.487 – – – –
Dias et al. 2014 301.192 -10.478 – 1.06 -6.17 –
Kharchenko et al. 2013 301.182 -10.485 – 1.0 -7.57 75.9
Piskunov et al. 2008 301.178 -10.486 – – – –
van den Bergh 2006 301.2 -10.525 – – – –
Kharchenko et al. 2005 301.18 -10.48 – 0.7 -7.92 –
Alessi et al. 2003 301.2 -10.525 – 2.3 -8.6 –
Dias et al. 2002 301.192 -10.478 – 2.32 -8.57 75.9

💡 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] Bfr BSS
Li et al. 2025 0.46 0.31 – 370 0.245 – – –
Almeida et al. 2025 0.45 0.50 – 352 – 82 – –
Alfonso et al. 2024 0.47 0.33 – 95 0.019 – – –
Hunt & Reffert 2024 – – – – – 180* – –
Cavallo et al. 2024 0.46 0.77 – 39 -0.230 – – –
Hunt & Reffert 2023 0.42 0.34 0.95 106 – – – –
Almeida et al. 2023 0.43 0.45 – 361 0.049 122* 0.46 –
Qin et al. 2023 0.60 0.74 – 79 – – – –
Just et al. 2023 – – – 157 – 13 – –
He et al. 2022 – 0.60 – 79 – – – –
Tarricq et al. 2022 0.46 – – 95 – – – –
Dias et al. 2021 0.45 0.50 – 352 0.019 – – –
Cantat-Gaudin et al. 2020 0.47 0.33 – 91 – – – –
Cantat-Gaudin & Anders 2020 0.44 – – – – – – –
Bossini et al. 2019 0.48 0.42 – 56 0.000 – – –
Soubiran et al. 2018 0.44 – – – – – – –
Cantat-Gaudin et al. 2018 0.44 – – – – – – –
Loktin & Popova 2017 1.92 0.75 – 195 – – – –
Kharchenko et al. 2016 0.51 0.69 – 157 – – – –
Kharchenko et al. 2013 0.51 0.69 – 157 – – – –
Piskunov et al. 2008 0.51 0.68 – 513 – – – –
van den Bergh 2006 0.51 0.68 – 224 – – – –
Kharchenko et al. 2005 0.51 0.68 – 513 – – – –
Alessi et al. 2003 0.38 0.56 – – – – – –
Dias et al. 2002 0.51 0.68 – 224 – – – –

(*): Indicates that this parameter is assigned more than one value in the corresponding reference.

Cluster % RA DEC Plx pmRA pmDE Rv UTI
CWWDL 14542 29.7 301.23 -10.53 2.27 1.47 -7.93 -16.39 0.0

💡 Note: The % column shows the percentage of members that Alessi 10 shares with each listed object.

Visualization
ℹī¸
Alessi 10 UCC
Alessi 10 HUNT23
Alessi 10 CANTAT20
Galactocentric position diagram