![Page 1: Discovery of Pluto by Clyde Tombaugh on February 18, 1930. The object moved, the background stars did not. Lick Observatory images are 1 day apart](https://reader038.vdocuments.mx/reader038/viewer/2022103123/56649d3a5503460f94a14e93/html5/thumbnails/1.jpg)
Discovery of Pluto by Clyde Tombaugh on February 18, 1930. The object moved, the background stars did not. Lick Observatory images are 1 day
apart
![Page 2: Discovery of Pluto by Clyde Tombaugh on February 18, 1930. The object moved, the background stars did not. Lick Observatory images are 1 day apart](https://reader038.vdocuments.mx/reader038/viewer/2022103123/56649d3a5503460f94a14e93/html5/thumbnails/2.jpg)
**
*
*
![Page 3: Discovery of Pluto by Clyde Tombaugh on February 18, 1930. The object moved, the background stars did not. Lick Observatory images are 1 day apart](https://reader038.vdocuments.mx/reader038/viewer/2022103123/56649d3a5503460f94a14e93/html5/thumbnails/3.jpg)
Pluto (diameter ~ 2320 km; surface T = - 390° F) and its moon Charon imaged by the Hubble Space Telescope
Charon was discovered in 1978 and is ~ 1,200 km in diameter
![Page 4: Discovery of Pluto by Clyde Tombaugh on February 18, 1930. The object moved, the background stars did not. Lick Observatory images are 1 day apart](https://reader038.vdocuments.mx/reader038/viewer/2022103123/56649d3a5503460f94a14e93/html5/thumbnails/4.jpg)
![Page 5: Discovery of Pluto by Clyde Tombaugh on February 18, 1930. The object moved, the background stars did not. Lick Observatory images are 1 day apart](https://reader038.vdocuments.mx/reader038/viewer/2022103123/56649d3a5503460f94a14e93/html5/thumbnails/5.jpg)
Pat Rawlings conception of the Pluto-Charon binary-planet system (left-front = Charon; right-back = Pluto)
![Page 6: Discovery of Pluto by Clyde Tombaugh on February 18, 1930. The object moved, the background stars did not. Lick Observatory images are 1 day apart](https://reader038.vdocuments.mx/reader038/viewer/2022103123/56649d3a5503460f94a14e93/html5/thumbnails/6.jpg)
Relative sizes of Pluto, Charon, and the US. Pluto is 2,320 km and Charon ~ 1,200 km in diameter
![Page 7: Discovery of Pluto by Clyde Tombaugh on February 18, 1930. The object moved, the background stars did not. Lick Observatory images are 1 day apart](https://reader038.vdocuments.mx/reader038/viewer/2022103123/56649d3a5503460f94a14e93/html5/thumbnails/7.jpg)
Pluto’s unusual orbitIt is steeply inclined (17°) and highly eccentric (0.25). At times, Pluto’s orbit
reaches inside that of Neptune
![Page 8: Discovery of Pluto by Clyde Tombaugh on February 18, 1930. The object moved, the background stars did not. Lick Observatory images are 1 day apart](https://reader038.vdocuments.mx/reader038/viewer/2022103123/56649d3a5503460f94a14e93/html5/thumbnails/8.jpg)
The New Horizons Mission – the race to catch the atmosphere of Pluto before it freezes in ~2015
Launch January 19, 2006
(Jupiter fly-by February 2007)
Pluto encounter in July 2015