Dwarf Planet Trivia
Here are planets and Moons bigger than a dwarf planet.
I will share this in case someone else has an interest in this trivia. For most people this information is useless.
I was surprised to discover Ceres, considered a dwarf planet, is ranked #32 among objects in our solar system. Our Moon is ranked #13. Two moons are bigger than Mercury. I knew some moons were big but I suppose I never appreciated how big is the stuff in general, including the TNO.
At the end of this post is the top 50 objects.
This is an analysis of the planets and their moons that are dwarf planet sized, or larger. The criteria is radius = or > that of Ceres, which is considered a dwarf planet though its diameter is roughly only 7% of Earth.
With this planet / moons outline this is somewhat their order from the sun.
Hopefully I made no major typing mistakes when compiling this data.
I compiled this list because some day I want to learn how the nebular hypothesis explains this distribution, so first I needed to see it.
size of planet by earth radius, by earth mass (if available)
r0.10e is 10% earth radius; m0.10e is 10% earth mass.
moons = quantity of moons at the planet
first column is its number for the planet, with 01 = closest to planet, usually; some moons were both numbered and named before more moons were found later
size details are relative to Earth, if available
Planets, followed by any big moons
sizer0.38em0.38e R8 by diameter
sizer0.95em0.91eR6 by diameter
sizer1.0em1.0eR5 by diameter
moons = 1
sizer0.27em0.17e R5 among moons
sizer0.53e m0.38eR7 by diameter
moons = 2
Ceres - dwarf planet
sizer0.07em0.03e R1 in size and mass in belt
01 Io r0.29e m0.18e R4 among moons
02 Europar0.25em0.13e R6 among moons
03 Ganymeder0.41eR1 among moons
would be R8 among planets
04 Callistor0.38em0.02e R3 among moons
sizer9.1em95eR3 by mass, R2 by diameter
05 Rhear0.12esize R9 among moons
06 Titanr0.41em0.022e R2 among moons
would be R9 among planets; Ganymede is R8
08 Iapetusr0.12e m0.022e
sizer4.0eR4 by mass, R3 by diameter
moons = 27
03 Titania size r0.12e m0.04e R8 among moons
04 Oberon size r0.12e m0.04e R10 among moons
sizer3.9eR3 by mass, R4 by diameter
moons = 14
01 Triton sizer0.21em0.08e R7 among moons
sizer0.19em0.06eR=9 among planets
moons = 5
01 Charon size r0.10em0.03e
Trans Neptunian Objects
Sedna- detached object
Erisdwarf planet, SDO
MakeMakedwarf planet, cubewano
Haumeadwarf planet - elliptical
2007 OR10resonant KBO (3:10)
size r0.09e m0.03e1110km
Size rank in solar system
24 2007 OR10
33 2002 MS4
36 2013 FY27
37 2003 AZ84
38 2002 AW197
40 2015 RR245
42 2004 GV9
43 2005 RN43
44 2002 UX25
45 2007 JJ43
48 2007 UK126
--- sun was first of the top 50 by size
Date updated 03/27/2019
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