1. Sun loses crown as biggest body in the Solar System Comet 17P/Holmes Yi-Jung Yang Astronomy news 11/29/2007 Nature news: 16 November 2007

2. Discovery  was discovered by Edwin Holmes on November 6, 1892  was brightened to an approximate magnitude of 4 or 5  was confirmed by different independent sources  the first calculations of the elliptical orbits were done independently by Heinrich Kreutz and George Mary Searle  perihelion date is June 13 & orbital period is 6.9 years  was appeared in 1899 and 1906 but lost afterward  was recovered on July 16, 1964 by Elizabeth Roemer

3. November 10, 1892 Near the Andromeda Galaxy (M31)

4. 2007 Outburst  Outburst between October 23-24, 2007  going from magnitude 17 to about magnitude 2.8 in 42 hours  First person reported the change was J. A. Henriquez Santana (Tenerife in the Canary Islands)  In late October 2007, its diameter reached 70% of the diameter of Sun  On November 9, 2007, the coma had dispersed to an area larger than the Sun, becoming the largest extended object in our solar system

5. Orbital Characteristics EpochEpoch: October 27, 2007 (JD 2454400.5) Aphelion distanceAphelion distance: 5.183610 AU Perihelion distancePerihelion distance: 2.053218 AU Semi-major axisSemi-major axis: 3.618414 AU EccentricityEccentricity: 0.432564 Orbital periodOrbital period: 6.882994 InclinationInclination: 19.1126° Last perihelion: May 4, 2007 Next perihelion (predicted): March 22, 2014

6. Location of comet Holmes in 2007 Motion viewed from Earth

7. Location of comet from Earth (45N, 8PM, Oct 30, 2007)

8. Motion with expanding dust cloud

9. Motion view from space

10. Holmes on October 26, 2007

11. Comet 17P/Holmes with the Ion Tail November 4, 2007 Hungary

12. Comet Holmes bigger than the Sun diameter ~ 1.4 million kilometers on November 9, 2007 by using wide-field camera on the CFHT (Canada-France-Hawaii Telescope)