Neha Patil (Editor)

596 Scheila

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Discovery date  21 February 1906
Observation arc  110.06 yr (40199 d)
Sidereal rotation period  16 hours
Discoverer  August Kopff
MPC designation  596 Scheila
Discovered  21 February 1906
Orbits  Sun
Asteroid group  Asteroid belt
596 Scheila wwwcalvineduacademicphysobservatoryimagesas
Discovered by  August Kopff Heidelberg (024)
Minor planet category  Main-belt Asteroid Main-belt comet
Aphelion  3.4107 AU (510.23 Gm) (Q)
Discovery site  Heidelberg-Königstuhl State Observatory
Similar  Comet Elst–Pizarro, 166P/NEAT, 44P/Reinmuth, 34D/Gale, 94P/Russell

Asteroid 596 scheila when worlds collide


596 Scheila is a main-belt asteroid and main-belt comet orbiting the Sun. It was discovered on 21 February 1906 by August Kopff from Heidelberg. Kopff named the asteroid after a female English student with whom he was acquainted.

Contents

Overview

On December 11.4 2010, Steve Larson of the Catalina Sky Survey detected a comet-like appearance to asteroid Scheila: it displayed a "coma" of about magnitude 13.5. Inspection of archival Catalina Sky Survey observations showed the activity was triggered between 2010 November 11 and December 3. Imaging with the 2-meter Faulkes Telescope North revealed a linear tail in the anti-sunward direction and an orbital tail, indicative of larger slower particles.

When first detected it was unknown what drove the ejecta plumes. Scheila's gravity is too large for electrostatics to launch dust. Cometary outgassing could not be ruled out until detailed spectroscopic observations indicated the absence of gas in Scheila's plumes. Observations by the Hubble Space Telescope and the Swift Gamma Ray Burst Mission's UV-optical telescope make it most likely that Scheila was impacted at ~5 km/s by a previously unknown asteroid ~35 meters in diameter. In 2010, the Hubble Space Telescope observed the aftermath of a catastrophic collision that destroyed the much smaller asteroid P/2010 A2. Each asteroid the size of Scheila might be hit by an impactor 10–100 meters in diameter approximately every 1000 years, so with 200 asteroids of this size or bigger in the asteroid belt, we can observe a collision as often as every 5 years.

Scheila last came to perihelion on 2012 May 19.

References

596 Scheila Wikipedia


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