Alessi 44

(ASCC 106; MWSC 3164)

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0.46 UTI
0.0
CN
0.13
Cdens
0.5
CC3
0.84
Clit
1.0
Cdup
N50 (P>50% members) 18
Stellar density (N50/rad) 0.7 [N/pc2]
C3 classification BB
  • CN 0.0 Sparse
  • Cdens 0.13 Very loose
  • CC3 0.5 Intermediate quality
  • Clit 0.84 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 44 is a sparse, very loose object of intermediate C3 quality. Its parallax locates it at a close distance, below the mid-plane, affected by moderate 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 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.

Almeida et al. (2025)
Mass determination: good 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).

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg06' along with UBC 14.

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 44 in: SciX Simbad
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Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 294.825 1.765 1.524 0.399 -2.272 -13.059
Li et al. 2025 295.325 1.592 1.496 0.463 -2.325 –
Almeida et al. 2025 295.286 1.494 – – – –
Alfonso et al. 2024 294.958 1.349 1.465 0.486 -2.438 –
Hunt & Reffert 2024 295.792 1.563 1.327 0.81 -2.493 -15.384
Cavallo et al. 2024 295.582 1.421 1.324 – – –
Hunt & Reffert 2023 295.792 1.563 1.327 0.81 -2.493 -15.384
Just et al. 2023 295.823 1.618 – – – –
Dias et al. 2021 295.286 1.494 1.505 0.491 -2.327 -9.767
Cantat-Gaudin et al. 2020 295.325 1.592 1.496 0.463 -2.325 –
Cantat-Gaudin & Anders 2020 295.325 1.592 1.496 0.463 -2.325 –
Soubiran et al. 2018 295.325 1.592 – – – -9.8
Bica et al. 2019 295.638 1.525 – – – –
Cantat-Gaudin et al. 2018 295.325 1.592 1.496 0.463 -2.325 –
Dib et al. 2018 295.83 1.62 – – – –
Loktin & Popova 2017 295.635 1.523 – -1.232 -7.051 -62.2
Sampedro et al. 2017 295.637 1.523 -0.52 -3.49 – –
Joshi et al. 2016 295.83 1.62 – – – –
Kharchenko et al. 2016 295.823 1.618 – – – –
Dias et al. 2014 295.638 1.523 – -0.5 -3.36 –
Kharchenko et al. 2013 295.83 1.62 – -1.9 -2.9 -62.2
Gozha et al. 2012 295.637 1.523 – – – –
Piskunov et al. 2008 295.777 1.596 – – – –
Kharchenko et al. 2007 295.78 1.6 – 0.66 – -62.2
Kharchenko et al. 2005 295.78 1.6 – -1.16 -2.74 –
Dias et al. 2002 295.637 1.523 – -1.16 -2.74 -62.2

💡 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– 0.66 1.07 0.58 263 0.043 563 – –
Li et al. 2025 0.68 0.74 – 75 0.056 – – –
Almeida et al. 2025 0.67 1.07 – 114 – 563 – –
Alfonso et al. 2024 0.68 0.71 – 218 0.030 – – –
Hunt & Reffert 2024 – – – – – 73(1) – –
Cavallo et al. 2024 0.76 1.19 – 145 0.500 – – –
Hunt & Reffert 2023 0.72 1.22 0.58 123 – – – –
Just et al. 2023 – – – 263 – 86 – –
Tarricq et al. 2022 0.67 – – 224 – – – –
Dias et al. 2021 0.67 1.07 – 114 0.029 – – –
Cantat-Gaudin et al. 2020 0.68 0.71 – 224 – – – –
Kounkel et al. 2020 0.64 0.87 – 112 – – – –
Cantat-Gaudin & Anders 2020 0.66 – – – – – – –
Soubiran et al. 2018 0.66 – – – – – – –
Cantat-Gaudin et al. 2018 0.66 – – – – – – –
Dib et al. 2018 0.53 – – 263 – – – –
Loktin & Popova 2017 0.65 1.78 – 306 – – – –
Joshi et al. 2016 0.53 0.98 – 263 – 603 – –
Kharchenko et al. 2016 0.53 0.98 – 263 – – – –
Kharchenko et al. 2013 0.53 0.98 – 263 – – – –
Gozha et al. 2012 0.50 – – 263 – 603 – –
Piskunov et al. 2008 0.50 1.10 – 263 – – – –
Kharchenko et al. 2005 0.50 1.10 – 263 – – – –
Dias et al. 2002 0.50 1.10 – 263 – – – –

(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 0069 44.0 294.77 2.28 1.5 0.26 -2.23 -9.39 0.1

💡 Note: The % column shows the percentage of members that Alessi 44 shares with each listed object.

Visualization
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Alessi 44 UCC
Alessi 44 HUNT23
Alessi 44 CANTAT20
Galactocentric position diagram