Haffner 23

(MWSC 1127; OCL 590; FoF 684)

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0.90 UTI
0.76
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
C3 classification AB
Number of members (P>50%) 125
Radius (P>50% members) 6.1 [arcmin]
  • CN 0.76 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 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
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Haffner 23 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate 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 metallicity and mass parameters (see Parameters). It is very well-studied in the literature.
Relatively close Low extinction Near-solar metallicity Intermediate age

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

Cavallo et al. (2024)
Gold sample.

Data
🔍 Search references for Haffner 23 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 – 107.399 -16.861 0.446 -0.509 -0.051 16.23
Li et al. 2025 107.389 -16.866 0.448 -0.526 -0.077 –
Almeida et al. 2025 107.385 -16.904 – – – –
Hunt & Reffert 2024 107.386 -16.852 0.447 -0.507 -0.039 15.599
Cavallo et al. 2024 107.406 -16.863 0.449 – – –
Hunt & Reffert 2023 107.386 -16.852 0.447 -0.507 -0.039 15.599
Almeida et al. 2023 107.4 -16.885 – – – –
Just et al. 2023 107.367 -16.918 – – – –
Dias et al. 2021 107.385 -16.904 0.448 -0.528 -0.07 –
Cantat-Gaudin et al. 2020 107.389 -16.866 0.448 -0.526 -0.077 –
Cantat-Gaudin & Anders 2020 107.389 -16.866 0.448 -0.526 -0.077 –
Liu & Pang 2019 107.403 -16.869 0.457 -0.531 -0.074 –
Bossini et al. 2019 107.389 -16.866 – – – –
Bica et al. 2019 107.366 -16.869 – – – –
Cantat-Gaudin et al. 2018 107.389 -16.866 0.448 -0.526 -0.077 –
Loktin & Popova 2017 107.355 -16.949 – 0.701 -1.407 –
Kharchenko et al. 2016 107.367 -16.918 – – – –
Dias et al. 2014 107.35 -16.95 – 2.07 -1.11 –
Kharchenko et al. 2013 107.373 -16.92 – -3.5 -0.15 –
Piskunov et al. 2008 107.32 -16.914 – – – –
Piskunov et al. 2007 107.32 -16.914 – – – –
Kharchenko et al. 2005 107.32 -16.92 – -3.7 -0.63 –
Kharchenko et al. 2003 107.38 -16.94 – -2.67 0.65 –

💡 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 1.85 0.71 – 592 -0.149 – – –
Almeida et al. 2025 1.89 1.02 – 256 – 314 – –
Hunt & Reffert 2024 – – – – – 926* – –
Cavallo et al. 2024 2.09 0.71 – 380 0.240 – – –
Hunt & Reffert 2023 2.05 0.52 0.67 222 – – – –
Almeida et al. 2023 1.97 0.84 – 495 -0.021 561* 0.45 –
Just et al. 2023 – – – 668 – 73 – –
Dias et al. 2021 1.89 1.02 – 256 -0.091 – – –
Cantat-Gaudin et al. 2020 2.04 0.66 – 316 – – – –
Cantat-Gaudin & Anders 2020 2.10 – – – – – – –
Liu & Pang 2019 – – – 457 0.250 – – –
Bossini et al. 2019 1.93 0.63 – 500 0.000 – – –
Cantat-Gaudin et al. 2018 2.10 – – – – – – –
Loktin & Popova 2017 0.92 0.41 – 611 – – – –
Kharchenko et al. 2016 1.00 0.31 – 668 – – – –
Kharchenko et al. 2013 1.00 0.31 – 668 – – – –
Piskunov et al. 2008 1.00 0.31 – 692 – 96* – –
Piskunov et al. 2007 1.00 0.31 – 692 – 16 – –
Kharchenko et al. 2005 1.00 0.31 – 692 – – – –
Kharchenko et al. 2003 0.59 0.31 – – – – – –

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

Visualization
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Haffner 23 UCC
Haffner 23 HUNT23
Haffner 23 CANTAT20
Galactocentric position diagram