The activities of comets related to their aging and origin

  title={The activities of comets related to their aging and origin},
  author={Fred Lawrence Whipple},
  journal={Celestial Mechanics and Dynamical Astronomy},
  • F. Whipple
  • Published 1992
  • Celestial Mechanics and Dynamical Astronomy
Two indices have been developed for the purpose of comparing the natures of various classes of comets. The first is the Activity Index (AI), measuring the inherent magnitude increase in brightness from great solar distances to maximum near perihelion. The second, or Volatility Index (VI), measures the variation in magnitude near perihelion. Tentative determinations of these two indices are derived from observations by Max Beyer over more than 30 years for long-period (L-P) and short-period (S-P… Expand
Dynamical history of the observed long-period comets
We present results of some numerical studies on the dynamical history of a large number of observed long-period comets. In our investigations we include all comets with good quality orbits. WeExpand
BVR photometry of comets 63P/Wild 1 and C/2012 K1 (PANSTARRS)
We analyzed the BVR photometry of the comets 63P/Wild 1 and C/2012 K1 (PANSTARRS) obtained between March 2013 and May 2014, with 0.20-m to 2.0-m aperture telescopes installed in Australia, Europa andExpand