Alessi 34

(ASCC 44; MWSC 1414)

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0.83 UTI
0.84
CN
1.0
Cdens
1.0
CC3
0.65
Clit
1.0
Cdup
N50 (P>50% members) 347
Stellar density (N50/rad) 12.0 [N/pc2]
C3 classification AA
  • CN 0.84 Rich
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 0.65 Moderately studied
  • Cdup 1.0 Unique
đŸ“Ĩ Members 📊 Colab đŸ”Ŧ Bayestar19 MOCAMOCA 🔍 CDS 🔍 Simbad 🔍 CDS (Îą, δ) 🔍 Simbad (Îą, δ)

Overview
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Alessi 34 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 massive, near-solar metallicity, young cluster, but with a large variance across recent sources for the mass parameter (see Parameters). It is moderately studied in the literature.

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

Yan et al. (2026)
Number of WDs: expected from single-star evolution N=1, with probability of formation through binary evolution >=0.5 N=12.

Liu et al. (2025)
Classified as primordial binary cluster 21 along with Gulliver_9.

Palma et al. (2025)
Part of multiple system G33, along with CWNU_1150 and Gulliver_9.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.99 (50th percentile).

Bica et al. (2019)
Web updates in DAML02, some were later removed (2003 to 2010). List of clusters and alike reported by B. Alessi. The Preliminary Amateur Open Cluster Catalog, Version 08/03/2003.

Data
🔍 Search references for Alessi 34 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– 120.099 -50.644 2.073 -5.194 5.722 11.158
Yan et al. 2026 120.062 -50.655 2.045 -5.01 5.743 –
Swiggum et al. 2024 120.062 -50.655 2.045 -5.01 5.743 12.467
Hunt & Reffert 2024 120.062 -50.655 2.045 -5.01 5.743 12.33
Cavallo et al. 2024 119.559 -50.713 2.043 – – –
Hunt & Reffert 2023 120.062 -50.655 2.045 -5.01 5.743 12.33
Just et al. 2023 120.476 -50.577 – – – –
Bica et al. 2019 120.453 -50.554 – – – –
Dib et al. 2018 120.48 -50.58 – – – –
Loktin & Popova 2017 120.45 -50.558 – -3.767 7.52 17.8
Sampedro et al. 2017 120.45 -50.558 -4.14 4.53 – –
Joshi et al. 2016 120.48 -50.58 – – – –
Kharchenko et al. 2016 120.476 -50.577 – – – –
Dias et al. 2014 120.45 -50.558 – -4.12 4.73 –
Kharchenko et al. 2013 120.48 -50.58 – -6.01 7.4 17.8
Gozha et al. 2012 120.45 -50.558 – – – –
Piskunov et al. 2008 120.412 -50.569 – – – –
Kharchenko et al. 2007 120.42 -50.57 – 0.4 – 17.8
Piskunov et al. 2007 120.412 -50.569 – – – –
Kharchenko et al. 2005 120.42 -50.57 – -5.62 6.25 17.8
Dias et al. 2002 120.45 -50.558 – -5.62 6.25 17.8

💡 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– 0.61 0.57 1.09 78 0.090 1376 – –
Yan et al. 2026 – – – 35 – – – –
Liu et al. 2025 0.67 0.23 – 28 – – – –
Swiggum et al. 2024 0.49 – – 21 – 1376 – –
Hunt & Reffert 2024 – – – – – 350(1) – –
Cavallo et al. 2024 0.52 0.92 – 13 0.090 – – –
Hunt & Reffert 2023 0.47 0.56 1.09 21 – – – –
Just et al. 2023 – – – 79 – 28 – –
Dib et al. 2018 0.55 – – 79 – – – –
Loktin & Popova 2017 0.72 0.83 – 204 – – – –
Joshi et al. 2016 0.55 0.85 – 79 – 2344 – –
Kharchenko et al. 2016 0.55 0.85 – 79 – – – –
Kharchenko et al. 2013 0.55 0.85 – 79 – – – –
Gozha et al. 2012 1.10 – – 78 – 2344 – –
Piskunov et al. 2008 1.10 0.57 – 78 – 2844(1) – –
Piskunov et al. 2007 1.10 0.57 – 78 – 908 – –
Kharchenko et al. 2005 1.10 0.57 – 78 – – – –
Dias et al. 2002 1.10 0.57 – 78 – – – –

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

Cluster % RA DEC Plx pmRA pmDE Rv UTI
UBC 480 7.2 120.09 -50.64 2.12 -5.34 5.71 7.78 0.0

💡 Note: The % column shows the percentage of members that Alessi 34 shares with each listed object.

Visualization
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Alessi 34 UCC
Alessi 34 HUNT23
Galactocentric position diagram