This page uses content from Wikipedia and is licensed under CC BY-SA.


Discovered by
Discovery siteSubaru
Discovery dateImaged: January 2018
Found: February 2019[1]
Orbital characteristics
Observation arc2 days[1]
Physical characteristics
Mean diameter
~400 km (250 mi)[4]

FarFarOut is the nickname of a trans-Neptunian object discovered while beyond 100 AU (15 billion km) from the Sun.[3] Imaged in January 2018 during a search for the hypothetical Planet Nine,[1] the object was announced in a press release on February 21, 2019, by astronomers Scott Sheppard, David Tholen, and Chad Trujillo, when they nicknamed it "FarFarOut" to emphasize its distance from the Sun.[3]


The object was initially estimated to be roughly 140 AU (21 billion km) from the Sun. But with a very short observation arc the uncertainties in this estimated distance have not been published. As of February 2019, it is the furthest observed member of the Solar System.[5]

Many near-parabolic comets are much further from the Sun. Caesar's Comet (C/-43 K1) is calculated to be more than 800 AU (120 billion km) from the Sun.[6] Comet Donati (C/1858 L1) is 145 AU (22 billion km) from the Sun.[7]

See also


  1. ^ a b c Redd, Noah Taylor (March 7, 2019). "New 'FarFarOut' World Is the Most Distant Solar System Object Known". Scientific American. Retrieved March 7, 2019.
  2. ^ Voosen, Paul (February 21, 2019). "Astronomers Discover Solar System's Most Distant Object, Nicknamed 'FarFarOut'". Science. doi:10.1126/science.aax1154.
  3. ^ a b c d Davis, Nicola (February 25, 2019). "'FarFarOut': Astronomer Finds Potential Furthest Object in Solar System". The Guardian.
  4. ^ Torbet, Georgina (March 2, 2019). "Dwarf Planet FarFarOut Is the Most Distant Object Discovered in Our Solar System". Digital Trends. Retrieved March 2, 2019.
  5. ^ Strickland, Ashley (February 28, 2019). "FarFarOut displaces FarOut as the most distant object in our solar system". CNN. Retrieved March 24, 2019.
  6. ^ "Horizon Online Ephemeris System for -43K1". Jet Propulsion Laboratory. Retrieved November 16, 2015.
  7. ^ "JPL Horizons On-Line Ephemeris for Comet C/1858 L1 (Donati)". JPL Horizons On-Line Ephemeris System. Retrieved February 23, 2019.
    Observer Location: @sun

External links