Table 1.2
Classes of potential cometary pre-cursors in the Outer Solar System
Category
Subcategory Class
Resonance
and/or
Tisserand
Form
Inclination
and
eccentricity Inner boundary
Outer
boundary Examples
Comment
Cis-Neptunian objects Centaurs
None but
T
J
> 3.05
Disc-like
Low
Perihelion
<30 AU
(2060) Chiron
Neptune
Trojans
1:1 with
Neptune
Clumped at
Lagrange
points
Low
TransNeptunian
objects
Kuiper
Belt
objects
Classical
KBO
(“cubewano”)
None
Toroidal
Low inc.,
low ecc.
(50000) Quaoar,
(136472)
Makemake
Resonant
KBOs
Various with
Neptune
(15809) 1994 JS
(3:5 resonance)
Plutinos
2:3 with
Neptune
Around Neptune’s orbit
(90482) Orcus
Sub-set of the resonant
KBOs
Twotinos
1:2 with
Neptune
Near Neptune’s
orbit
(119979) 2002
WC
19
Sub-set of the resonant
KBOs
Scattered
disk
objects
Resonant
SDOs
Many 1:!3
Disc-like
Intermediate
inc., moderate ecc.
2000 CR
105
(Gomes et al.
2008)
Detached
objects,
extreme
TNOs and
Sednoids
None
High
eccentricity
~50 AU
>150 AU (136199) Eris
(90377) Sedna,
2013 FT
28
Defined by some as also
being inner Oort cloud
objects. Also called
extended scattered disc
objects (E-SDO), distant
detached objects (DDO),
or scattered–extended
objects (Elliot et al. 2005)
Oort cloud
objects
Inner Oort
cloud objects
None
Disc-like
Low
~250 AU
~30,000
AU
2012 VP113
Outer Oort
cloud objects
None
Isotropic
Isotropic
18
1 Light Curves, Orbits, and Reservoirs