Comets: A Descriptive Catalog

30 arcmin apparition April arcmin in diameter arcmin long arcsec astronomers August Brian Marsden brightness central condensation Cerro El Roble coma diameter comet became comet brightened comet faded comet moved comet was described comet was discovered comet was last comet was recovered December decreasing degrees long described the comet diffuse discovered this comet Discovery Magnitude distance from Earth estimated the total faint February increasing distance independent discovery January January 26 July June Jupiter last detected last observed last seen Lick Observatory located magni magnitude 9 magnitude estimates March Marsden month Mrkos nearly November November 25 nuclear magnitude object Observations continued October orbit is elliptical orbit is hyperbolic Orbital calculations Palomar Observatory perigee perihelion date perihelion distance period photographed plates exposed predicted recovered the comet Roemer September Southern Hemisphere sun and Earth sun's glare tail extended tail length telescope total magnitude tude twilight U. S. Naval Observatory visible Yerkes Observatory