Planet Satellite   Comments
Venus 2002 VE68   Has an extremely eccentric orbit moving inside Mercury's orbit, as well as outside Earth's.  It has been in this orbit for approximately 7,000 years, but is likely to move away from the resonance within the next 500 years or so. 
Earth 2004 GU9
2006 FV35
2010 SO16
2016 HO3
  Currently, Jue 2016, Earth has four known quasi-satellites.  In addition, several objects move in horseshoe orbits that may, in the past, have been quasi-satellites and/or may, in the future, become quasi-satellites.  2016 HO3 is the most recent discovery, and has been with us for nearly 100 years.  It is expected to stay for several centuries more. 
Jupiter   Jupiter has no known quasi-satellites, but due to the size of Jupiter and its proximity to Saturn, a quasi-satellite could stay in a stable resonance for a maximum of about a million years. 
Saturn   Like Jupiter, Saturn has no known quasi-satellites, but due to its size and its proximity to Jupiter, a quasi-satellite could stay in a stable resonance for a maximum of about 100,000 years. 
Uranus   Uranus has no known quasi-satellites, but could, theoretically, retain them for long periods; possibly five billion years or more. 
Neptune 2007 RW10   Neptune's one known quasi-satellite has been in this state for approximately 12,500 years, and is likely to remain there for a further 12,500 years.  Neptune, like Uranus, could, theoretically, retain quasi-satellites for upwards of five 5 billion years. 
Pluto 1994 JR1
(Arawn)
  The gravitational influence of Neptune has forced this object into a cyclic, quasi-satellite relationship with Pluto.  It is likely that this object becomes a quasi-satellite roughly once every two million years, and remains one for about 350,000 years.  HYPERLINK "/wiki/Arawn"Arawn is the ruler of the Celtic underworld. 
WILLIAM & DEBORAH HILLYARD

Solar System -

The Asteroid Belt

Quasi-Satellites

Menu:
A quasi-satellite orbits the Sun in a 1:1 orbital resonance with one of the planets.  The object's orbit around the Sun takes the same time as its associated planet, but is, generally, more eccentric in shape so it speeds up and slows down rather more than its associated planet.  Viewed from the planet, the object appears to orbit the planet, although the apparent orbit is usually shaped more like a "peanut" or rectangle.   These orbits are, generally, unstable and last for a limited period, although this could be quite long; millions of years in some cases.  In some instances, it is cyclic so the object becomes a quasi-satellite for a period, is then lost to the planet but eventually returns.