Berlin 2014 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

EP: Fachverband Extraterrestrische Physik

EP 4: Planeten

EP 4.5: Vortrag

Dienstag, 18. März 2014, 15:15–15:30, DO24 1.103

The multi-tailed asteroid P/2013 P5 — •Jessica Agarwal1, David Jewitt2, Harold Weaver3, Max Mutchler4, and Stephen Larson51Max-Planck-Institut für Sonnensystemforschung, Göttingen, Deutschland — 2University of California, Los Angeles, USA — 3The Johns Hopkins University Applied Physics Laboratory, Laurel, USA — 4Space Telescope Science Institute, Baltimore, USA — 5University of Arizona, Tucson, USA

We present Hubble Space Telescope observations of the active asteroid P/2013 P5, (P5) and discuss possible mechanisms for its activation. P5 is an inner Main Belt asteroid <240m in diameter, and was discovered in August 2013 by the Pan-STARRS sky survey, following a brightening episode that produced a comet-like appearance. We obtained high-resolution images of P5 with the Hubble Space Telescope and found six tails emerging from the nucleus. Each tail contained dust ejected at a specific date over the spring and summer of 2013. Since the activity of this asteroid is episodic, we exclude an impact as the cause. Also sublimation of subsurface ices is an unlikely cause of activity, because temperatures in the inner Main Belt are too high for asteroids to harbour ices over the age of the solar system. We therefore think that the most likely cause of the activity is rotation-driven break-up, where YORP or other torques have increased the spin rate of the asteroid to the point where surface material breaks loose and escapes the gravity field of the nucleus. P5 is the second asteroid (P/2010 A2 being the first) with indications that we might witness such a process.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2014 > Berlin