The Sep issue (vol. 701) of Astronomy & Astrophysics still says “in progress”, but I’m going ahead:
Minker, K. Carry, B. Vachier, F. et al. A dynamical dichotomy in large binary asteroids A42 202554973
Hmiddouch, S. Jehin, E. Lippi, M. et al. Variations in the volatile-driven activity of comet C/2017 K2 (PanSTARRS) revealed by long-term multiwavelength observations A61 202555864
Brasser, R. Impact chronology of leftover planetesimals A108 202555873
Benavidez, P. G. Cardoso, V. S. Bagatin, A. C. et al. Collisional evolution of Jupiter trojans after capture: Insights into their origin and cratering record A118 202554339
Aravind, K. Jehin, E. Hmmidouch, S. et al. Ionic emission from and activity evolution in comet C/2020 F3 (NEOWISE): Insights from long-slit spectroscopy and photometry A161 202554842
J. Li, X. Shi, J. Shi, et al. Pre-perihelion radio observations of comet 12P/Pons-Brooks with the Tianma Radio Telescope A204 202554867
Yao, J. Liu, J-C. Liu, X. et al. Comparison of the Gaia-CRF3 and planetary ephemerides via asteroid observations A15 202452534
Alvarez-Candal, A. Rizos, J. L. Colazo, M. et al. A catalog of near-IR absolute magnitudes of Solar System small bodies A231 202554269
By various means, we have found that asteroid natural satellites are not rare. About one in six asteroids has a “moon”, sometimes two. Minker et al. have found a curious categorization. Asteroid systems seem to have formed by two pathways, resulting in the configurations we see today.
Comet compositions are difficult to study, because most components (including water, technically) don’t show spectral features in visible telescopes. It takes infrared and ultraviolet studies to say much more than “active” or “inactive”- Hmiddouch et al., Aravind et al., and Li et al. have done those studies.
The early Solar System included numerous impacts, and (supposedly) a Late Heavy Bombardment. Or did it? Brasser pieces together a cratering record, to gauge the impact processes and timelines.
Speaking of which, the Lucy mission is about to (~2027+) give us our first views of Jupiter Trojan asteroids. One major investigation will be their cratering record, and therefore the dynamical history of that region. Before 2027, Benavidez et al. simulate the early Solar System, and its cratering.
Mapping the full sky is quite the job. It is necessary to designate ‘benchmarks’ and ‘mileposts’ among the stars. Most of them are radio sources, since our radio telescopes are very advanced and not limited by Earth’s wobbly, rippling atmosphere. The Gaia mission was launched to do the same job in the visible range, avoiding our atmosphere completely. But how do we ‘test the test’? Yao et al. use asteroid detections to check Gaia’s third reference frame. As moving bodies, asteroids may pass near radio emitters, as well as the reference stars Gaia used. Sure enough, some Gaia discrepancies can be seen.
Of course, there’s an oddball among a large set. Alvarez-Candal et al. publish a dataset of near-infrared asteroid measurements. Again, our common and inexpensive telescopes work in the visible range. Adding near-IR data is complementary; many asteroid types show their signs in this spectral band.