A5035230000- Astro and Planetary Science
- Isotope Analysis in Ecology
- Atmospheric Ozone and Climate
- Astrophysics and Star Formation Studies
- Mass Spectrometry Techniques and Applications
- Stellar, planetary, and galactic studies
We report results from new and archival observations of the newly discovered active asteroid (248370) 2005 QN_137, which has been determined to be a likely main-belt comet based on subsequent discovery that it is recurrently near perihelion. From data analysis, we estimate g'-, r'-, i'-, z'-band absolute magnitudes for nucleus H_g=16.62+/-0.13, H_r=16.12+/-0.10, H_i=16.05+/-0.11, H_z=15.93+/-0.08, corresponding colors g'-r'=0.50+/-0.16, r'-i'=0.07+/-0.15, i'-z'=0.12+/-0.14, an equivalent...
Cometary activity may be driven by ices with very low sublimation temperatures, such as carbon monoxide ice, which can sublimate at distances well beyond 20 au. This point is emphasized the discovery of Oort cloud comet C/2014 UN$_{271}$ (Bernardinelli-Bernstein), and its observed out to $\sim$26 Through observations this comet's optical brightness behavior, we potentially discern drivers in outer solar system. We present a study Bernardinelli-Bernstein broad-band photometry taken 19-20 au...