પ્લૂટો (પ્રતીક: [14] અને [15]) પહેલાં સૂર્યમંડળના નવમા ગ્રહ તરીકે ઓળખવામાં આવતો હતો, પણ હવે તેને સૌરમંડળના બીજા સૌથી મોટા વામન ગ્રહ તરીકે વર્ગીકૃત કરવામાં આવે છે. તેની સૂર્યની આસપાસ પરીભ્રમણ કક્ષા એટલી લંબગોળ છે જેને કારણે તે નૅપ્ચ્યુન ગ્રહની કક્ષા ની અંદર પ્રવેશ કરે છે. પ્લૂટો સૂર્યથી ખૂબ દૂર હોવાને કારણે તે આખો બરફથી ઢંકાયેલો છે અને અંધાર્યો છે.
પ્લૂટો પૃથ્વીના ઉપગ્રહ ચંદ્રથી પણ નાનો છે. પ્લૂટોને ૫ ચંદ્ર છે. પ્લૂટોનું તાપમાન -૨૩૩° સે. સુધીનું હોય છે.
This photograph was taken by the Ralph telescope aboard New Horizons on July 14, 2015 from a distance of 35,445km (22,025mi). The most prominent feature in the image, the bright, youthful plains of Tombaugh Regio and Sputnik Planitia, can be seen at right. It contrasts the darker, more cratered terrain of Cthulhu Macula at lower left. Because of Pluto's 119.591° tilt at its axis, the southern hemisphere is barely visible in this image; the equator runs through Cthulhu Macula and the southern parts of Sputnik Planitia.
The mean elements here are from the Theory of the Outer Planets (TOP2013) solution by the Institut de mécanique céleste et de calcul des éphémérides (IMCCE). They refer to the standard equinox J2000, the barycenter of the Solar System, and the epoch J2000.
Surface area derived from the radius r: .
Volume v derived from the radius r: .
Surface gravity derived from the mass M, the gravitational constantG and the radius r: .
Escape velocity derived from the mass M, the gravitational constantG and the radius r: .
Based on geometry of minimum and maximum distance from Earth and Pluto radius in the factsheet
Simon, J.L.; Francou, G.; Fienga, A.; Manche, H. (September 2013). "New analytical planetary theories VSOP2013 and TOP2013". Astronomy and Astrophysics. 557 (2): A49. Bibcode:2013A&A...557A..49S. doi:10.1051/0004-6361/201321843. The elements in the clearer and usual format is in the spreadsheet and the original TOP2013 elements here.
"Horizon Online Ephemeris System for Pluto Barycenter". JPL Horizons On-Line Ephemeris System @ Solar System Dynamics Group. મેળવેલ January 16, 2011. (Observer Location @sun with the observer at the center of the Sun)
Nimmo, Francis (2017). "Mean radius and shape of Pluto and Charon from New Horizons images". Icarus. 287: 12–29. arXiv:1603.00821. Bibcode:2017Icar..287...12N. doi:10.1016/j.icarus.2016.06.027. Unknown parameter |displayauthors= ignored (|display-authors= suggested) (મદદ)
Stern, S. A.; Grundy, W.; McKinnon, W. B.; Weaver, H. A.; Young, L. A. (2017). "The Pluto System After New Horizons". Annual Review of Astronomy and Astrophysics. 2018: 357–392. arXiv:1712.05669. doi:10.1146/annurev-astro-081817-051935.
Stern, S. A. (2015). "The Pluto system: Initial results from its exploration by New Horizons". Science. 350 (6258): 249–352. arXiv:1510.07704. Bibcode:2015Sci...350.1815S. doi:10.1126/science.aad1815. PMID26472913. Unknown parameter |displayauthors= ignored (|display-authors= suggested) (મદદ)
Amos, Jonathan (July 23, 2015). "New Horizons: Pluto may have 'nitrogen glaciers'". BBC News. મેળવેલ July 26, 2015. It could tell from the passage of sunlight and radiowaves through the Plutonian "air" that the pressure was only about 10 microbars at the surface