. Authors . Problem . Method . Advises . Contact Analysis of an accuracy of CCD asteroid observations carried out by professional and amateur astronomers . An accuracy estimation of CCD asteroid observations contained in the Minor Planet Center Database and carried out in the years 1999 - 2006 is realized. About 20 millions individual positions of the Numbered and Unnumbered Minor Planets were tested by means of calculations of (O-C) residuals to derive "mean error of a single observation" for more than 400

... Tonight's Sky . ... т??Neapolitanт?? exoplanets come in three flavors . New research shows that exoplanets can be divided into three groups terrestrials, gas giants, and mid-sized gas dwarfs. ... New research finds that exoplanets can be divided into three groups terrestrials, gas giants, and mid-sized "gas dwarfs" based on how their host stars tend to fall into three distinct groups defined by their compositions. ... Only registered members of Astronomy.com are allowed to comment on this article. ...