Plutoid

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Sze of the major Trans-Neptunian dwarf planets

Plutoid is an astronomical designation for dwarf planets beyond the orbit of Neptune.

Astronomy

Currently this group in cludes Pluto, Haumea, Makemake, and Eris.[1]
Official astronomy's (IAU) candidates for receiving the status of a plutoid are Quaoar and Sedna.

Table

Name Type Date of discovery,
Photographic proof (UT), Place
Diameter[2]
+ Moon(s)
Perihelion q
Aphelion Q[3]
Orbital Period[4][3] Degree of
Perihelion (ca.)[3]
Pluto Plutoid 18.2.1930 23:00
Flagstaff (AZ)
2.370 km
+ 1.208 km + ca. 45 km + ca. 35 km + ca. 30 km + ca. 8 km
q Sep 1989 29.658 AU 247.68 a 15° Sco.gif
Quaoar Cubewano 4.6.2002 5:41:40
Palomar Mountain (CA)
1170 km Q Sep 2070 45,169 AU
q Mar 1927 42,008 AU
285.97 a 11° Vir.gif
Eris Plutoid/ SDO 21.10.2003 6:25:09
Palomar Mountain (CA)
2.326 km q Jan 1698 38.540 AU
Q Oct 1978 97.557 AU
556,97 a 14° Lib.gif
Sedna TNO 14.11.2003 6:32:57
Palomar Mountain (CA)
995 km q Aug 2075 76.361 AU
Q 960.782 AU
11.222 a Can.gif
Haumea Plutoid 28.12.2004 0:40:40
Observatorio de Sierra
Nevada (SPA)
1.150 x 2.200 km
+ 310 km + 160 km
Q Feb 1991 51.524 AU
q Oct 2133 35.159 AU
285,3 a 29° Pis.gif
Makemake Plutoid 31.3.2005 6:13:30
Palomar Mountain (CA)
1.473 km q Nov 1879 38,543 AU
Q Jun 2034 52,778 AU
308,54 a 17° Ari.gif

Critical Review

Astronomy's classification of Pluto as being both a plutino and a plutoid is rather confusing.
In his chapter "Plutoids, Rutoids, Schmutoids" David Jewitt summarizes : "Big KBOs are best called... Big KBOs. Fussing about with other names may have value to some, but it is not scientific value." [5]

See also

Weblinks

Notes and References

  1. Modern astrologers, however, still consider Pluto to be a regular planet.
  2. Johnstons Archive: List of Known Trans-Neptunian Objects.
  3. 3.0 3.1 3.2 The exact positions still are uncertain
  4. a = years
  5. David Jewitt: Kuiper Belt