---
title: 'A List of Dwarf Planets'
url: 'https://grav.alicesastroinfo.com/blog/a-list-of-dwarf-planets'
markdown: 'https://grav.alicesastroinfo.com/blog/a-list-of-dwarf-planets.md'
date: '2008-09-18'
description: '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…'
taxonomy:
  category:
    - 'Answering Questions'
    - 'AstroInfo Article'
    - Relinking
  tag:
    - Ceres
    - 'Dwarf Planets'
    - Eris
    - Haumea
    - Makemake
    - Pluto
---

# [A List of Dwarf Planets](https://grav.alicesastroinfo.com/blog/a-list-of-dwarf-planets)

   18th Sep 2008   [Ceres](https://grav.alicesastroinfo.com/tag:Ceres#body-wrapper) [Dwarf Planets](https://grav.alicesastroinfo.com/tag:Dwarf%20Planets#body-wrapper) [Eris](https://grav.alicesastroinfo.com/tag:Eris#body-wrapper) [Haumea](https://grav.alicesastroinfo.com/tag:Haumea#body-wrapper) [Makemake](https://grav.alicesastroinfo.com/tag:Makemake#body-wrapper) [Pluto](https://grav.alicesastroinfo.com/tag:Pluto#body-wrapper)  

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: h[ttp://www.planetary.org/blog/article/00001553](//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://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](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](http://planetarynames.wr.usgs.gov/append7.html#DwarfPlanets)
[Planetary Society List of Notable Trans-Neptunian Objects](http://www.planetary.org/explore/topics/trans_neptunian_objects/list.html)

### Where’d I Get My Info?

Thanks to [Mike Brown](http://www.mikebrownsplanets.com/), [Emily Lakdawalla](http://www.planetary.org/blog), and [Bill Arnett](http://www.nineplanets.org/)

---

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