Stock 20

(MWSC 39)

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0.90 UTI
0.74
CN
0.89
Cdens
1.0
CC3
0.94
Clit
1.0
Cdup
Nm (P>50%) 98
Core radius and density 1.3 [pc], 4.4 [pc-2]
C3 classification AA
  • CN 0.74 Moderately populated
  • Cdens 0.89 Dense
  • CC3 1.0 Very high quality
  • Clit 0.94 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
Stock 20 is a moderately populated, dense object of very high C3 quality. Its parallax locates it at a moderate distance, near the mid-plane, affected by low extinction. It is catalogued as a near-solar metallicity, young cluster, but with a large variance across recent sources for the age, metallicity, and mass parameters (see Parameters). It is very well-studied in the literature.

Liu et al. (2025)
Classified as tidal capture (resonant trapping binary) 143 along with FSR_0498, and of multiple system 37 along with CWNU_1298 and FSR_0498.

Palma et al. (2025)
Part of multiple system G84, along with CWNU_1298 and FSR_0498.

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).

Hu et al. (2021)
Ellipticities (core, all): e_core=0.3322, e_all=0.2096.

Piecka & Paunzen (2021)
Belongs to cluster aggregate 'Agg56' along with SAI 4.

Data
πŸ” Search references for Stock 20 in: SciX Simbad
ℹ️
Reference Year RA [deg] DEC [deg] Plx [mas] pmRA [mas/yr] pmDE [mas/yr] Rv [km/s]
UCC 99999– 6.322 62.627 0.356 -3.227 -1.173 -71.883
Liu et al. 2025 6.31 62.63 0.35 -3.19 -1.16 -53.8
Li et al. 2025 6.318 62.624 0.342 -3.237 -1.124 –
Almeida et al. 2025 6.309 62.615 – – – –
Hunt & Reffert 2024 6.311 62.626 0.353 -3.194 -1.157 -53.804
Celli et al. 2024 6.318 62.624 – – – –
Cavallo et al. 2024 6.446 62.704 0.354 – – –
Hunt & Reffert 2023 6.311 62.626 0.353 -3.194 -1.157 -53.804
Almeida et al. 2023 6.296 62.617 – – – –
Just et al. 2023 6.304 62.598 – – – –
Dias et al. 2021 6.309 62.615 0.345 -3.235 -1.129 –
Cantat-Gaudin et al. 2020 6.318 62.624 0.342 -3.237 -1.124 –
SΓ‘nchez et al. 2020 6.312 62.617 – -3.319 -1.235 –
Cantat-Gaudin & Anders 2020 6.318 62.624 0.342 -3.237 -1.124 –
Cantat-Gaudin et al. 2018 6.318 62.624 0.342 -3.237 -1.124 –
Dib et al. 2018 6.313 62.602 – – – –
Loktin & Popova 2017 6.315 62.617 – -2.66 -3.132 –
Sampedro et al. 2017 6.312 62.617 – -1.8 2.9 –
Joshi et al. 2016 6.313 62.602 – – – –
Kharchenko et al. 2016 6.304 62.598 – – – –
Dias et al. 2014 6.312 62.617 – -2.53 2.51 –
Kharchenko et al. 2013 6.313 62.602 – -2.56 -3.24 –
Kharchenko et al. 2012 6.313 62.602 – -2.56 -3.24 –
Bukowiecki et al. 2011 6.321 62.621 – – – –
Piskunov et al. 2008 6.299 62.618 – – – –
Kharchenko et al. 2005 6.31 62.62 – -0.4 -1.12 –
Kharchenko et al. 2003 6.31 62.61 – 0.55 -1.18 –
Dias et al. 2002 6.312 62.617 – -2.53 2.51 –
Lynga 1987 6.228 62.645 – – – –

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– 2.16 0.78 1.48 78 -0.150 298 0.64 –
Liu et al. 2025 4.23 0.47 – 17 – – – –
Li et al. 2025 2.16 1.40 – 13 -0.342 – – –
Almeida et al. 2025 2.57 1.48 – 13 – 354 – –
Hunt & Reffert 2024 2.64 1.12 1.48 24 – 484(1) – –
Celli et al. 2024 – – – 19 – 254 – –
Cavallo et al. 2024 2.39 1.39 – 17 -0.200 – – –
Hunt & Reffert 2023 2.64 1.12 1.48 24 – – – –
Almeida et al. 2023 2.41 1.48 – 18 -0.033 298(1) 0.64 –
Just et al. 2023 – – – 217 – 42 – –
Dias et al. 2021 2.57 1.48 – 13 -0.100 – – –
Cantat-Gaudin et al. 2020 2.59 1.09 – 19 – – – –
Kounkel et al. 2020 2.74 1.57 – 55 – – – –
Cantat-Gaudin & Anders 2020 2.69 – – – – – – –
Cantat-Gaudin et al. 2018 2.69 – – – – – – –
Dib et al. 2018 1.10 – – 217 – – – –
Loktin & Popova 2017 2.15 0.87 – 148 – – – –
Joshi et al. 2016 1.10 0.63 – 217 – 93 – –
Kharchenko et al. 2016 1.10 0.63 – 217 – – – –
Kharchenko et al. 2013 1.10 0.63 – 217 – – – –
Bukowiecki et al. 2012 – – – – – 412 – –
Kharchenko et al. 2012 1.10 0.63 – 217 – – – –
Bukowiecki et al. 2011 1.85(1) 0.69 – 100 – – – –
Piskunov et al. 2008 0.91 0.63 – 339 – – – –
Kharchenko et al. 2005 0.91 0.63 – 339 – – – –
Kharchenko et al. 2003 0.91 0.63 – – – – – –
Dias et al. 2002 1.10 0.63 – 217 – – – –

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

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