Stock 20

(MWSC 39)

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0.95 UTI
0.74
CN
1.0
Cdens
1.0
CC3
1.0
Clit
1.0
Cdup
C3 classification AA
Number of members (P>50%) 98
Radius (P>50% members) 3.4 [arcmin]
  • CN 0.74 Moderately populated
  • Cdens 1.0 Very dense
  • CC3 1.0 Very high quality
  • Clit 1.0 Very well-studied
  • Cdup 1.0 Unique
πŸ“₯ Members πŸ“Š Colab πŸ”¬ Bayestar19 πŸ” CDS πŸ” Simbad πŸ” CDS (Ξ±, Ξ΄) πŸ” Simbad (Ξ±, Ξ΄)

Overview
ℹ️
Stock 20 is a moderately populated, very 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.

(*): The parallax distance estimate (~2.81 kpc) differs significantly from the median photometric distance (~2.16 kpc).

Relatively close Low extinction Near-solar metallicity Young

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

Cavallo et al. (2024)
Gold sample.

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 – 6.322 62.627 0.356 -3.227 -1.173 -71.883
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 –
Loktin & Popova 2017 6.315 62.617 – -2.66 -3.132 –
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 –
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 –

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] Bfr BSS
Li et al. 2025 2.16 1.40 – 13 -0.342 – – –
Almeida et al. 2025 2.57 1.48 – 13 – 354 – –
Hunt & Reffert 2024 – – – – – 484* – –
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* 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 – – – –
Cantat-Gaudin & Anders 2020 2.69 – – – – – – –
Cantat-Gaudin et al. 2018 2.69 – – – – – – –
Loktin & Popova 2017 2.15 0.86 – 148 – – – –
Kharchenko et al. 2016 1.10 0.62 – 217 – – – –
Kharchenko et al. 2013 1.10 0.62 – 217 – – – –
Kharchenko et al. 2012 1.10 0.62 – 217 – – – –
Piskunov et al. 2008 0.91 0.62 – 339 – – – –
Kharchenko et al. 2005 0.91 0.62 – 339 – – – –
Kharchenko et al. 2003 0.91 0.62 – – – – – –
Dias et al. 2002 1.10 0.62 – 217 – – – –

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

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