Minor Planets

Object	Category	Dist (AU)	Diameter (km)
2003 UB313 (Xena)	Planet?	67.5	3000
Pluto	Planet	39.3	2274
2003 VB12 (Sedna)	Oort Cloud Object	90	1800
2004 DW (Orcus)	Plutino	45	1600
2003 EL61 (Santa)	Scattered KBO	43	1500
2005 FY9 (Easterbunny)	Cubewano	43	1500
2002 LM60 (Quaoar)	Cubewano	42	1250
2001 KX76 (Ixion)	Cubewano	43	1200
Charon	Moon (of Pluto)	39.3	1172
Ceres	Cisjovian	2.78	940
Varuna	Cubewano	43.3	900 ⁺¹⁰⁰_-150
1996 TO66	Cubewano	43.4	830
2000 EB173	Plutino	39.2	757
S/2005- 2003-UB313-1 (Gabrielle)	Moon (of Xena)	67.5	375?
S/2005 P1	Moon (of Pluto)	39.3	45-160?
S/2005 P2	Moon (of Pluto)	39.3	45-160?
S/2005- 2003-EL61-1 (Rudolph)	Moon (of Santa)	43	15?
S/2005- 2003-EL61-2	Moon (of Santa)	43	?

Minor Planet Categories

Radius Equation

R^2=4.53x10^5 r^2 delta^2 p^-1 10^(-0.4*V)

R is the radius of the object. r is the heliocentric distance in AU. Delta is its distance from Earth in AU. p is its geometric albedo, usually assumed to be 0.04 for Kuiper Belt objects, though Pluto has an albedo of 0.44 to 0.61. V is the visual magnitude.

For Varuna on 11 Nov. 2000, delta=42.273, r=43.028, and V=19.9. With an assumed albedo of 0.04, this leads to a radius 641.99 km, thus diameter of 1283.984 km.

Links

IAU Minor Planet List