Haffner 20

(VDBH 16; MWSC 1385; OCL 692; vdBergh-Hagen 16; ESO 430 04)

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0.90 UTI
0.76
CN
1.0
Cdens
0.75
CC3
1.0
Clit
1.0
Cdup
N50 (P>50% members) 130
Stellar density (N50/rad) 26.1 [N/pc2]
C3 classification AB
  • CN 0.76 Rich
  • Cdens 1.0 Very dense
  • CC3 0.75 High quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 MOCAMOCA πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Haffner 20 is a rich, very dense object of high C3 quality. Its parallax locates it at a moderate* distance, near 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 absorption, age, and metallicity parameters (see Parameters). It is very well-studied in the literature.

(*): The parallax distance estimate (~4.79 kpc) differs significantly from the median photometric distance (~3.61 kpc).

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

Cavallo et al. (2024)
Gold sample.

Data
πŸ” Search references for Haffner 20 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 119.066 -30.369 0.209 -2.292 3.441 68.699
Li et al. 2025 119.061 -30.369 0.178 -2.294 3.407 –
Almeida et al. 2025 119.06 -30.363 – – – –
Hunt & Reffert 2024 119.065 -30.369 0.217 -2.286 3.436 68.67
Cavallo et al. 2024 119.062 -30.356 0.206 – – –
Hunt & Reffert 2023 119.065 -30.369 0.217 -2.286 3.436 68.67
Almeida et al. 2023 119.06 -30.364 – – – –
Just et al. 2023 119.058 -30.364 – – – –
Dias et al. 2021 119.06 -30.363 0.172 -2.316 3.43 –
Cantat-Gaudin et al. 2020 119.061 -30.369 0.178 -2.294 3.407 –
SΓ‘nchez et al. 2020 119.062 -30.367 – -2.434 3.389 –
Cantat-Gaudin & Anders 2020 119.061 -30.369 0.178 -2.294 3.407 –
Soubiran et al. 2018 119.061 -30.369 – – – 69.48
Bica et al. 2019 119.072 -30.359 – – – –
Cantat-Gaudin et al. 2018 119.061 -30.369 0.178 -2.294 3.407 –
Loktin & Popova 2017 119.07 -30.367 – 0.738 -0.803 –
Kharchenko et al. 2016 119.058 -30.364 – – – –
Dias et al. 2014 119.062 -30.367 – -0.9 -2.04 –
Kharchenko et al. 2013 119.062 -30.367 – 0.92 -2.38 –
van den Bergh 2006 119.075 -30.4 – – – –
Dias et al. 2002 119.062 -30.367 – -0.61 -1.83 –

πŸ’‘ 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– 3.61 1.785 1.14 132 -0.112 402 0.58 –
Li et al. 2025 2.11 0.42 – 3785 0.240 – – –
Almeida et al. 2025 3.67 2.23 – 87 – 426 – –
Hunt & Reffert 2024 – – – – – 661(1) – –
Cavallo et al. 2024 3.61 2.39 – 186 -0.120 – – –
Hunt & Reffert 2023 4.02 2.12 1.14 203 – – – –
Almeida et al. 2023 3.54 2.22 – 187 -0.174 377(1) 0.58 –
Just et al. 2023 – – – 114 – 268 – –
Dias et al. 2021 3.67 2.23 – 87 -0.103 – – –
Cantat-Gaudin et al. 2020 4.35 1.80 – 195 – – – –
Cantat-Gaudin & Anders 2020 4.84 – – – – – – –
Soubiran et al. 2018 4.84 – – – – – – –
Cantat-Gaudin et al. 2018 4.84 – – – – – – –
Loktin & Popova 2017 3.19 1.72 – 141 – – – –
Kharchenko et al. 2016 2.91 1.74 – 114 – – – –
Kharchenko et al. 2013 2.91 1.74 – 114 – – – –
van den Bergh 2006 3.12 1.77 – 132 – – – –
Dias et al. 2002 3.12 1.76 – 132 – – – –

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

Visualization
ℹ️
Haffner 20 UCC
Haffner 20 HUNT23
Haffner 20 CANTAT20
Galactocentric position diagram