Daniel R. Weisz et al 2019 ApJL 885 L8
Investigation of 20 faint M31 satellites indicates they all quenched 3–9 billion years ago, in contrast to Milky Way satellites that are either faint with ancient quenching times, or luminous with recent quenching times.
P. M. Shober et al 2019 AJ 158 183
An extremely slow fireball was recently observed travelling at just 11 km/s. This object was a “minimoon”, or a temporarily captured orbiter — an object gravitationally captured by the Earth-Moon system.
Carl J. Grillmair 2019 ApJ 884 174
From photometry and proper motions from the Gaia Data Release 2, a 50° long stream of about 70 stars have been detected extending westward from the halo globular cluster M5.
M. R. Combi et al 2019 ApJL 884 L39
SOHO observations of the hydrogen coma of comet C/2017 S3 (PanSTARRS) allow for an estimate of the size of the nucleus of the comet just before its final outburst and apparent disintegration.
Hua Gao et al 2019 ApJS 244 34
Examination of 320 disk galaxies from the Carnegie-Irvine Galaxy Survey suggests that, on average, bulge prominence decreases from early- to late-type disk galaxies, with similar prominence in barred and unbarred spirals.
Martín A. Guerrero et al 2019 ApJ 884 134
The central star of NGC 2392, which shows the hardest X-ray emission among central stars of planetary nebulae, displays rapid X-ray variability that may be due to accretion of material from an unseen companion.