1. Extended analytical formulae for the perturbed Keplerian motion under low-thrust acceleration and orbital perturbations

   • Marilena Di Carlo
   • Simão da Graça Marto
   • Massimiliano Vasile

   Original Article Open access 12 March 2021 Article: 13

   

2. Konstantin Kholshevnikov 1939–2021

   • I. I. Shevchenko
   • L. L. Sokolov

   Obituary 11 March 2021 Article: 12

   

3. Normal forms for the Laplace resonance

   • Giuseppe Pucacco

   Original Article Open access 11 March 2021 Article: 11

4. From the Lagrange polygon to the figure eight I

   • Renato Calleja
   • Carlos García-Azpeitia
   • J. D. Mireles James

   Original Article 10 March 2021 Article: 10

   

5. On a set of J\(_2\) equinoctial orbital elements and their use for uncertainty propagation

   • Jeffrey M. Aristoff
   • Joshua T. Horwood
   • Kyle T. Alfriend

   Original Article 09 March 2021 Article: 9