Updated September 18, 2008

Haumea:

Diameter: 1,320-1,550 km
Orbit Radius: 35.161-51.525 AU
Moons: Hi’iaka and Namaka
Composition: almost all rock
Discovered: 2003 Mike Brown, Chad Trujillo, and David Rabinowitz or Francisco José Aceituno Castro, Pablo Santos-Sanz, and Jose-Luis Ortiz
Resource: http://www.planetary.org/blog/article/00001649/, http://web.gps.caltech.edu/~mbrown/2003EL61/
Other Classifications: Plutoids, Trans-Neptunian Object, Kuiper Belt Object

Make-make:

Diameter: 1,600 km
Orbit Radius: 38.666-52.809 AU
Moons: ?
Composition: ?
Discovered: 2005 Mike Brown, Chad Trujillo, and David Rabinowitz
Resource: http://www.planetary.org/blog/article/00001553,
http://www.mikebrownsplanets.com/2008/06/whats-in-name.html
Other Classifications: Plutoids, Trans-Neptunian Object, Kuiper Belt Object

Eris:

Diameter: 2400 km
Orbit Radius: 38.17- 97.61 AU
Moon: Dysnomia
Composition: roughly half rock, half ice
Discovered: 2003-2005 Mike Brown, Chad Trujillo, and David Rabinowitz
Resource: http://www.planetary.org/explore/topics/trans_neptunian_objects/eris.html
http://web.gps.caltech.edu/~mbrown/planetlila/
Other Classifications: Plutoids, Trans-Neptunian Object, Kuiper Belt Object

Ceres:

Diameter: 950 km
Orbit Radius: 2.98 AU
Moons: none
Composition: rock with 17-27% water ice
Discovered: 1801 by Guiseppe Piazzi
Resource: http://www.planetary.org/explore/topics/asteroids_and_comets/ceres.html
Other Classifications: Asteroid

Pluto:

Diameter: 2,306 km
Orbit Radius: 30.164- 48.494 AU
Moons: Charon, Nix, Hydra
Composition: probably a mixture of 70% rock and 30% water ice
Discovered: 1930 by Clyde Tombaugh
Resource: http://www.nineplanets.org/pluto.html
Other Classifications: Plutoids, Trans-Neptunian Object, Kuiper Belt Object

Want More?

Planetary Names List of Dwarf Planets
Planetary Society List of Notable Trans-Neptunian Objects

Where’d I Get My Info?

Thanks to Mike Brown, Emily Lakdawalla, and Bill Arnett

Makemake. A new name to add to your list.

Makemake (pronounced “maki-maki” “MAH-kay MAH-kay”) is the newest dwarf planet. It was discovered in 2005, but just gained its new official status (and name) in mid-July.

Artist’s conception of the largest known Kuiper Belt Objects and their moons.
Credit: A. Feild (Space Telescope Science Institute) edited by Alice

“Makemake is the creator of humanity and god of fertility in the mythology of the South Pacific island of Rapa Nui, known to most speakers of English as Easter Island” says Emily Lakdawalla. Oddly enough, in the interim between discovery and official naming, Mike Brown and his cohort have been calling this solar system object “Easterbunny.”

Want More?

Emily’s got a great article over at The Planetary Society
Mike Brown’s Commentary (He’s the one who named it)

Where’d I Get My Info?

USGS’s official site