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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.

Planet details

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

Moon details
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
moons= 62

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  r0.01e

size r0.09e m0.03e1110km

2002 MS4cubewano

Size rank in solar system
01 Jupiter
02 Saturn
03 Uranus
04 Neptune
05 Earth
06 Venus
07 Mars
08 Ganymede
09 Titan
10 Mercury
11 Callisto
12 Io
13 Moon
14 Europa
15 Triton
16 Pluto
17 Eris
18 Haumea
19 Titania
20 Rhea
21 Oberon
22 Iapetus
23 Makemake
24 2007 OR10
25 Charon
26 Umbriel
27 Ariel
28 Dione
29 Quoar
30 Tethys
31 Sedna
32 Ceres
33 2002 MS4
34 Orcus
35 Salacia
36 2013 FY27
37 2003 AZ84
38 2002 AW197
39 Varda
40 2015 RR245
41 Dysnomia
42 2004 GV9
43 2005 RN43
44 2002 UX25
45 2007 JJ43
46 Varuna
47 Ixion
48 2007 UK126
49 Chaos
--- sun was first of the top  50 by size

Date updated 03/27/2019

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