Marc W. Buie et al 2020 AJ 159 130

Four stellar occultations by (486958) Arrokoth, the flyby target of the New Horizons extended mission, more precisely constrain its shape and position and find no presence of rings or other debris around it.

Yi-Han Wang et al 2020 ApJL 891 L14

Simulations show that giant planets born around a typical Sun-like star could be exchanged during a dynamical interaction with a flyby low-mass star, resulting in a tight orbit of the planet around the low-mass star.

Scott G. Carlsten et al 2020 ApJ 891 144

An extensive search for dwarf satellite galaxies around 10 primary host galaxies in the Local Volume (<12 Mpc) using archival CFHT/MegaCam imaging data revealed 155 candidates, of which 93 are new.

E. Altamura et al 2020 AJ 159 122

Two quasars have been serendipitously discovered just 76 kpc apart; they are confirmed to lie at the same redshift and appear to represent a small-separation physical quasar binary.

S. Abdollahi et al 2020 ApJS 247 33

The fourth Fermi Large Area Telescope catalog (4FGL) of gamma-ray sources, based on 8 years of Fermi data, is the deepest yet in the 50 MeV – 1 TeV energy range and contains 5,064 sources above 4σ significance.

Naor Movshovitz et al 2020 ApJ 891 109

Modeling based on Saturn’s measured gravity field are used to contrain the planet’s interior structure, finding signs of a core that’s lower in density and larger in radial extent than typically found by standard models.