Alessi 24

(ASCC 89; MWSC 2582; FoF 2389; OCSN 142)

Click to load Aladin Lite
0.97 UTI
0.84
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 350
Stellar density (N50/rad) 30.2 [N/pc2]
C3 classification AA
  • CN 0.84 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 24 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, young 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.

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

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Alessi 24 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 260.778 -62.718 2.058 -0.451 -8.976 9.223
Li et al. 2025 260.764 -62.693 2.059 -0.488 -8.999 –
Wei et al. 2025 260.776 -62.653 2.07 -0.483 -8.939 –
Almeida et al. 2025 260.654 -62.784 – – – –
Alfonso et al. 2024 260.809 -62.61 2.019 -0.461 -8.946 –
Hunt & Reffert 2024 260.978 -62.818 2.042 -0.43 -8.963 9.593
Cavallo et al. 2024 260.777 -62.66 2.06 – – –
Hunt & Reffert 2023 260.978 -62.818 2.042 -0.43 -8.963 9.593
Qin et al. 2023 260.85 -62.66 2.07 -0.48 -8.96 9.67
He et al. 2022 260.842 -62.678 2.07 -0.46 -8.95 –
Tarricq et al. 2022 260.962 -62.61 2.045 -0.505 -8.957 –
Dias et al. 2021 260.654 -62.784 2.063 -0.481 -8.932 7.304
Cantat-Gaudin et al. 2020 260.764 -62.693 2.059 -0.488 -8.999 –
Cantat-Gaudin & Anders 2020 260.764 -62.693 2.059 -0.488 -8.999 –
Liu & Pang 2019 260.826 -62.701 2.051 -0.389 -8.956 –
Bossini et al. 2019 260.764 -62.693 – – – –
Soubiran et al. 2018 260.764 -62.693 – – – 12.32
Bica et al. 2019 260.992 -62.864 – – – –
Cantat-Gaudin et al. 2018 260.764 -62.693 2.059 -0.488 -8.999 –
Loktin & Popova 2017 261.0 -62.864 – 1.35 -8.31 -6.95
Dias et al. 2014 261.004 -62.863 – -1.62 -5.22 –
Gozha et al. 2012 261.004 -62.863 – – – –
Piskunov et al. 2008 260.804 -62.641 – – – –
Kharchenko et al. 2007 260.82 -62.64 – 1.1 – 12.3
Piskunov et al. 2007 260.804 -62.641 – – – –
Kharchenko et al. 2005 260.82 -62.64 – 1.35 -8.31 4.0
Dias et al. 2002 261.004 -62.863 – 1.35 -8.31 -6.95

💡 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– 0.5 0.31 0.53 71 0.022 628 0.14 –
Li et al. 2025 0.47 0.30 – 85 -0.034 – – –
Wei et al. 2025 0.62 0.44 – 50 0.250 290 0.14 –
Almeida et al. 2025 0.48 0.24 – 286 – 227 – –
Alfonso et al. 2024 0.50 0.34 – 77 0.078 – – –
Hunt & Reffert 2024 – – – – – 313(1) – –
Cavallo et al. 2024 0.51 0.46 – 26 -0.070 – – –
Hunt & Reffert 2023 0.47 0.16 0.53 100 – – – –
Qin et al. 2023 0.59 0.56 – 141 – – – –
He et al. 2022 – 0.30 – 71 – – – –
Tarricq et al. 2022 0.50 – – 74 – – – –
Dias et al. 2021 0.48 0.24 – 286 0.079 – – –
Cantat-Gaudin et al. 2020 0.50 0.34 – 72 – – – –
Cantat-Gaudin & Anders 2020 0.48 – – – – – – –
Liu & Pang 2019 – – – 66 0.250 – – –
Bossini et al. 2019 0.46 0.34 – 88 -0.154 – – –
Soubiran et al. 2018 0.48 – – – – – – –
Cantat-Gaudin et al. 2018 0.48 – – – – – – –
Loktin & Popova 2017 0.42 0.31 – 11 – – – –
Gozha et al. 2012 0.50 – – 11 – 3090 – –
Piskunov et al. 2008 0.50 0.31 – 11 – 1941(1) – –
Piskunov et al. 2007 0.50 0.31 – 11 – 944 – –
Kharchenko et al. 2005 0.50 0.31 – 11 – – – –
Dias et al. 2002 0.50 0.31 – 11 -0.133 – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
OC 0638 8.9 261.0 -62.86 2.07 -0.34 -8.94 6.93 0.0
LISC-III 3249 7.4 260.88 -62.08 2.06 -0.56 -8.74 9.26 0.05
OC 0639 7.1 261.07 -62.46 2.04 -0.42 -8.97 8.85 0.0

💡 Note: The % column shows the percentage of members that Alessi 24 shares with each listed object.

Visualization
ℹī¸
Alessi 24 UCC
Alessi 24 HUNT23
Alessi 24 CANTAT20
Galactocentric position diagram