To cite package ‘planets’ in publications use:

Jiménez Rico A (2019). planets: Simple and Accessible Data from all Known Planets. R package version 0.1.0, https://github.com/aljrico/planets.

Corresponding BibTeX entry:

  @Manual{,
    title = {planets: Simple and Accessible Data from all Known
      Planets},
    author = {Alejandro {Jiménez Rico}},
    year = {2019},
    note = {R package version 0.1.0},
    url = {https://github.com/aljrico/planets},
  }