Alessi 5

(MWSC 1844; FoF 2407; OCSN 138)

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1.0 UTI
1.0
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
Nm (P>50%) 665
Core radius and density 1.2 [pc], 27 [pc-2]
C3 classification AA
  • CN 1.0 Very 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 5 is a very rich, very dense object of very high C3 quality. Its parallax locates it at a very close distance, near the mid-plane, affected by low extinction. It is catalogued as a low-mass, near-solar metallicity, young cluster, but with a large variance across recent sources for the mass parameter (see Parameters). It is very well-studied in the literature.

Liu et al. (2025)
Classified as primordial binary cluster 18 along with HSC_2398.

Almeida et al. (2025)
Mass determination: good fit. Isochrone match: good fit. Gold 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 1.6, 0 WD candidates found, and 1 WD candidate found in the wide search.

Hu et al. (2021)
Ellipticities (core, all): e_core=0.174, e_all=0.2929.

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg07' along with BH 99.

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 5 in: SciX Simbad
ℹī¸
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 160.833 -61.089 2.508 -15.386 2.526 10.065
Li et al. 2025 160.819 -61.081 2.501 -15.411 2.503 –
Wei et al. 2025 160.83 -61.039 2.514 -15.351 2.469 –
Almeida et al. 2025 160.621 -61.118 – – – –
Alfonso et al. 2024 160.904 -61.086 2.484 -15.376 2.542 –
Swiggum et al. 2024 160.902 -61.111 2.497 -15.4 2.544 10.158
Hunt & Reffert 2024 160.902 -61.111 2.497 -15.4 2.544 13.41
Cavallo et al. 2024 160.827 -61.086 2.509 – – –
Hunt & Reffert 2023 160.902 -61.111 2.497 -15.4 2.544 13.41
Qin et al. 2023 160.87 -61.09 2.5 -15.36 2.52 9.65
Just et al. 2023 160.824 -61.166 – – – –
He et al. 2022 160.7 -61.029 2.502 -15.453 2.556 –
Richer et al. 2021 160.802 -61.109 2.201 -15.344 2.573 –
Dias et al. 2021 160.621 -61.118 2.492 -15.363 2.537 11.504
Cantat-Gaudin et al. 2020 160.819 -61.081 2.501 -15.411 2.503 –
Cantat-Gaudin & Anders 2020 160.819 -61.081 2.501 -15.411 2.503 –
Liu & Pang 2019 160.691 -61.076 2.494 -15.354 2.569 –
Bossini et al. 2019 160.819 -61.081 – – – –
Soubiran et al. 2018 160.819 -61.081 – – – 12.49
Bica et al. 2019 160.777 -61.165 – – – –
Cantat-Gaudin et al. 2018 160.819 -61.081 2.501 -15.411 2.503 –
Dib et al. 2018 160.83 -61.17 – – – –
Loktin & Popova 2017 160.785 -61.167 – -14.33 4.4 8.2
Sampedro et al. 2017 160.783 -61.167 – -2.45 -2.04 –
Joshi et al. 2016 160.83 -61.17 – – – –
Kharchenko et al. 2016 160.824 -61.166 – – – –
Dias et al. 2014 160.783 -61.167 – -2.62 -1.91 –
Kharchenko et al. 2013 160.83 -61.17 – -12.5 2.42 8.2
Gozha et al. 2012 160.783 -61.167 – – – –
Piskunov et al. 2008 160.777 -61.165 – – – –
Kharchenko et al. 2007 160.78 -61.17 – 0.3 – 12.8
Piskunov et al. 2007 160.777 -61.165 – – – –
van den Bergh 2006 160.725 -61.2 – – – –
Kharchenko et al. 2005 160.78 -61.17 – -14.56 3.77 12.8
Alessi et al. 2003 160.725 -61.2 – -14.3 4.4 –
Dias et al. 2002 160.783 -61.167 – -14.33 4.4 18.0

💡 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– 0.4 0.5 0.73 54 0.000 37 0.17 –
Liu et al. 2025 0.52 0.21 – 51 – – – –
Li et al. 2025 0.44 0.57 – 54 0.048 – – –
Wei et al. 2025 0.51 0.76 – 41 0.000 492 0.17 –
Almeida et al. 2025 0.40 0.40 – 61 – 408 – –
Alfonso et al. 2024 0.42 0.62 – 49 0.063 – – –
Swiggum et al. 2024 0.39 – – 56 – 743 – –
Hunt & Reffert 2024 0.38 0.40 0.73 56 – 684(1) – –
Cavallo et al. 2024 0.41 0.85 – 26 0.130 – – –
Hunt & Reffert 2023 0.38 0.40 0.73 56 – – – –
Qin et al. 2023 0.48 0.60 – 56 – – – –
Just et al. 2023 – – – 58 – 18 – –
He et al. 2022 – 0.50 – 40 – – – –
Tarricq et al. 2022 0.42 – – 68 – – – –
Richer et al. 2021 – 0.62 – 80 – – – –
Dias et al. 2021 0.40 0.40 – 61 0.064 – – –
Cantat-Gaudin et al. 2020 0.42 0.62 – 68 – – – –
Kounkel et al. 2020 0.40 0.65 – 65 – – – –
Cantat-Gaudin & Anders 2020 0.40 – – – – – – –
Liu & Pang 2019 – – – 34 -0.250 – – –
Bossini et al. 2019 0.35 0.59 – 53 -0.133 – – –
Soubiran et al. 2018 0.40 – – – – – – –
Cantat-Gaudin et al. 2018 0.40 – – – – – – –
Dib et al. 2018 0.38 – – 58 – – – –
Loktin & Popova 2017 0.42 0.47 – 40 – – – –
Joshi et al. 2016 0.38 0.66 – 58 – 37 – –
Kharchenko et al. 2016 0.38 0.66 – 58 – – – –
Kharchenko et al. 2013 0.38 0.66 – 58 -0.382 – – –
Gozha et al. 2012 0.40 – – 40 – 37 – –
Piskunov et al. 2008 0.40 0.47 – 51 – 18(1) – –
Piskunov et al. 2007 0.40 0.47 – 51 – 9 – –
van den Bergh 2006 0.40 0.47 – 40 – – – –
Kharchenko et al. 2005 0.40 0.47 – 51 – – – –
Alessi et al. 2003 0.40 0.47 – 40 – – – –
Dias et al. 2002 0.40 0.47 – 40 -0.382 – – –

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

Visualization
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Alessi 5 UCC
Alessi 5 HUNT23
Alessi 5 CANTAT20
Galactocentric position diagram