Short vacation ideas for In order to calculate a comet’s intrinsic brightness, astronomers work out how bright it would be if it were exactly AU from both Earth and the Sun. A comet may be intrinsically bright, but, owing to its distance from Earth and the Sun, never display its full glory to human observers. Hale-Bopp’s maximum apparent magnitude was but, since its absolute magnitude was around had it arrived at perihelion four months earlier, when it would have been much closer to Earth, its apparent magnitude would have been about – to suficient to make it visible in the daytime. Tycho’s comet of seems to have had an absolute magnitude of , and may have had an apparent brightness greater than magnitude Sarabat’s Comet of had a rather unimpressive maximum apparent magnitude certainly no greater than +., since it never came closer to the Sun than AU. However, its absolute magnitude was between – and Had it made a close pass by the Sun and/or Earth, it would almost certainly have been as bright as the full Moon, probably hundreds of times brighter, suficient to enable Earth-dwellers to read a newspaper at midnight. The giant parent of the Kreutz sungrazing family of comets, responsible for many of the greatest historical comets e. Short vacation ideas 2016.