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List of artificial objects leaving the Solar System

January 18, 2023

The artificial objects leaving the Solar System are all space probes and the upper stages of their launch vehicles, all launched by NASA. Three of the probes, Voyager 1, Voyager 2, and New Horizons are still functioning and are regularly contacted by radio communication, while Pioneer 10 and Pioneer 11 are now derelict. In addition to these spacecraft, some upper stages and de-spin weights are leaving the Solar System, assuming they continue on their trajectories.

The red and green arrows indicate the positions of Voyager 1 and Pioneer 10 respectively at the end of 2008; the blue shell indicates the estimated size of the termination shock they have entered, whereas the grey annulus shows the Kuiper belt. The yellow shell indicates one light-day distance from the Sun, and the yellow arrow, the vernal point. Click on image for larger view and links to other scales.
Trajectories of distant spacecraft from launch to 2030
Top: Polar view; Bottom: Equatorial view
Plot of Voyager 2′s heliocentric velocity against its distance from the Sun, illustrating the use of gravity assist to accelerate the spacecraft by Jupiter, Saturn and Uranus, and finally its encounter with Neptune's Triton. Gravity assists are akin to bouncing the spacecraft off a planet, but because the planet is moving it doesn't just bounce but is pushed by the planet, like when a baseball is hit by a moving baseball bat.

These objects are leaving the Solar System because their velocity and direction are taking them away from the Sun, and at their distance from the Sun, its gravitational pull is not sufficient to pull these objects back or into orbit. They are not impervious to the gravitational pull of the Sun and are being slowed, but are still traveling in excess of escape velocity to leave the Solar System and coast into interstellar space.

Planetary exploration probes

  • Pioneer 10 – launched in 1972, flew past Jupiter in 1973 and is heading in the direction of Aldebaran (65 light years away) in the constellation of Taurus. Contact was lost in January 2003, and it is estimated to have passed 132 astronomical units (AU; one AU is roughly the average distance between Earth and the Sun: 150 million kilometers (93 million miles)).[1]
  • Pioneer 11 – launched in 1973, flew past Jupiter in 1974 and Saturn in 1979. Contact was lost in November 1995, and it is estimated to be at around 107 AU.[2] The spacecraft is headed toward the constellation of Aquila, northwest of the constellation of Sagittarius. Barring an incident, Pioneer 11 will pass near one of the stars in the constellation in about 4 million years.[3]
  • Voyager 2 – launched in August 1977, flew past Jupiter in 1979, Saturn in 1981, Uranus in 1986, and Neptune in 1989. The probe left the heliosphere for interstellar space at 119 AU on 5 November 2018.[4] Voyager 2 is still active. It is not headed toward any particular star, although in roughly 40,000 years it should pass 1.7 light-years from the star Ross 248.[5] If undisturbed for 296,000 years, it should pass by the star Sirius at a distance of 4.3 light-years.
  • Voyager 1 – launched in September 1977, flew past Jupiter in 1979 and Saturn in 1980, making a special close approach to Saturn's moon Titan. The probe passed the heliopause at 121 AU on 25 August 2012 to enter interstellar space.[6] Voyager 1 is still active. It is headed towards an encounter with star Gliese 445 (AC +79 3888), which lies 17.6 light-years from Earth, in about 40,000 years.[7]
  • New Horizons – launched in 2006, the probe flew past Jupiter in 2007 and Pluto on 14 July 2015. It flew past the Kuiper belt object 486958 Arrokoth on January 1, 2019, as part of the Kuiper Belt Extended Mission (KEM).[8]

Although other probes were launched first, Voyager 1 has achieved a higher speed and overtaken all others. Voyager 1 overtook Voyager 2 a few months after launch, on 19 December 1977.[9] It overtook Pioneer 11 in 1983,[10] and then Pioneer 10—becoming the probe farthest from Earth—on February 17, 1998.[11] Voyager 2 is moving faster than all other probes launched before it; it overtook Pioneer 11 in the late 1980s and will overtake Pioneer 10 in 2023.[12]

Depending on how the "Pioneer anomaly" affects it, New Horizons will also probably pass the Pioneer probes, but will need many years to do so. It will not overtake Pioneer 11 until the 22nd century, will not overtake Pioneer 10 until the end of that century, and will never overtake the Voyagers.[10]

Speed and distance from the Sun

To put the distances in the table in context, Pluto's average distance (semi-major axis) is about 40 AU.

Name Launched Distance to the Sun (AU)
(As of 2022)[13][14]		 Speed (km/s)[13][14]
Voyager 1 1977 158.62 16.9
Pioneer 10 1972 132.54 11.9
Voyager 2 1977 132.19 15.3
Pioneer 11 1973 109.19 11.2
New Horizons 2006 58.95 13.8

Note: Data above as of December 31, 2022. Source: JPL,[13] heavens-above.com,[14] and for New Horizons.[15]

Solar escape velocity is a function of distance (r) from the Sun's center, given by

 

where the product G Msun is the heliocentric gravitational parameter. The initial speed required to escape the Sun from its surface is 618 km/s (1,380,000 mph),[16] and drops down to 42.1 km/s (94,000 mph) at Earth's distance from the Sun (1 AU), and 4.21 km/s (9,400 mph) at a distance of 100 AU.[17][18]

  •  

    Voyager 1 and 2 speed and distance from the Sun

  •  

    Pioneer 10 and 11 speed and distance from the Sun

  •  

    New Horizons speed and distance from the Sun.

In order to leave the Solar System, the probe needs to reach the local escape velocity. After leaving Earth, the Sun's escape velocity is 42.1 km/s. In order to reach this speed, it is highly advantageous to also use the orbital speed of the Earth around the Sun, which is 29.78 km/s. By later passing near a planet, a probe can gain extra speed with a gravity assist.

Propulsion stages

 
A Star-48 rocket motor like the one used to launch the New Horizons probe

Every planetary probe was placed into its escape trajectory by a multistage rocket, the last stage of which ends up on nearly the same trajectory as the probe it launched. Because these stages cannot be actively guided, their trajectories are now different from the probes they launched (the probes were guided with small thrusters that allow course changes). However, in cases where the spacecraft acquired escape velocity because of a gravity assist, the stages may not have a similar course and there is the extremely remote possibility that they collided with something. The stages on an escape trajectory are:

  • Pioneer 10 third stage, a TE364-4 variant of the Star-37 solid fuel rocket.[19]
  • Voyager 1 fourth stage, a Star 37E solid fuel rocket.[20]
  • Voyager 2 fourth stage, a Star 37E solid fuel rocket.[20]
  • New Horizons third stage, a Star 48B solid fuel rocket, is on a similar escape trajectory out of the Solar System to New Horizons, even arriving at Jupiter six hours before New Horizons. On October 15, 2015 it passed Pluto's orbit at a distance of 213 million kilometers (over 1 AU) distant from Pluto.[21][22] This was four months after New Horizons' Pluto flyby.[23]

In addition, two small yo-yo de-spin weights on wires were used to reduce the spin of the New Horizons probe prior to its release from the third-stage rocket. Once the spin rate was lowered, these masses and the wires were released, and so are also on an escape trajectory out of the Solar System.[24][25]

None of the above objects are trackable – they have no power or radio antennas, spin uncontrollably, and are too small to be detected. Their exact positions are unknowable beyond their projected Solar System escape trajectories.

The third stage of Pioneer 11 is thought to be in solar orbit because its encounter with Jupiter would not have resulted in escape from the Solar System.[20][better source needed] Pioneer 11 gained the required velocity to escape the Solar System in its subsequent encounter with Saturn.[dubious – discuss]

On January 19, 2006 the New Horizons spacecraft to Pluto was launched directly into a solar-escape trajectory at 16.26 kilometers per second (58,536 km/h; 36,373 mph) from Cape Canaveral using an Atlas V and the Common Core Booster, Centaur upper stage, and Star 48B third stage.[26] New Horizons passed the Moon's orbit in just nine hours.[27][28] The subsequent encounter with Jupiter only increased its velocity, and just enabled the probe to arrive at Pluto three years earlier than without this encounter.

Thus the only objects to date to be launched directly into a solar escape trajectory were the New Horizons spacecraft, its third stage, and the two de-spin masses. The New Horizons Centaur (second) stage is not escaping; it is in a 2.83-year heliocentric (solar) orbit.[21]

The Pioneer 10 and 11, and Voyager 1 and 2 Centaur (second) stages are also in heliocentric orbits.[25][29]

Future

Given the huge emptiness of interstellar space, all the objects listed here are likely to continue into deep space in timelines that, barring the exceptionally unlikely chance of their colliding with (or being collected by) another object, could outlast even the Main Sequence existence of the Sun's life, billions of years hence. They do not, however, have enough velocity to escape the Milky Way galaxy into intergalactic space.

Ulysses

In 1990, Ulysses was launched and was designed to study the Sun; its extended mission ended in 2008. Ulysses is currently in a 79° inclination orbit around the Sun with its apoapsis crossing the orbit of Jupiter. In November 2098, it will have another close fly-by with Jupiter, crossing between the orbits of Europa and Ganymede. After this slingshot maneuver, it will possibly enter a hyperbolic trajectory around the Sun and eventually leave the Solar System.[30]

Ulysses is now switched-off as its RTG power supply has run down, and so is uncontactable and cannot be tracked or guided in any way. Its exact trajectory is therefore unknowable as factors such as solar radiation pressure could significantly alter its encounter path.

Gallery

  •  

    Photograph of Voyager 1 / Voyager 2

  •  

    Artist's concept of Pioneer 10 / Pioneer 11

  •  

    Artist's concept of Pioneer 10 near Jupiter

  •  

    Artist's concept of New Horizons approaching Pluto.

  •  

    Artist's concept of New Horizons near Pluto.

See also

References

  1. ^ "Pioneer 10 Live Position and Data". TheSkyLive.com. Retrieved 2019-08-11.
  2. ^ "Pioneer 11 Live Position and Data". TheSkyLive.com. Retrieved 2019-08-11.
  3. ^ "The Pioneer Missions". NASA. 3 March 2015.
  4. ^ Gill, Victoria (December 10, 2018). "Nasa's Voyager 2 probe 'leaves the Solar System'". BBC News. Retrieved December 10, 2018.
  5. ^ "Voyager – Mission – Interstellar Mission". NASA. June 22, 2007. Retrieved August 14, 2013.
  6. ^ Harwood, William (September 12, 2013). "Voyager 1 finally crosses into interstellar space". CBS News.
  7. ^ Wall, Mike (13 September 2015). "Interstellar Traveler: NASA's Voyager 1 Probe On 40,000-Year Trek to Distant Star". Retrieved 4 June 2018.
  8. ^ Brown, Dwayne (2016-07-01). "New Horizons Receives Mission Extension to Kuiper Belt, Dawn to Remain at Ceres" (Press release). Washington, DC. NASA. Retrieved 2016-10-06.
  9. ^ Gebhardt, Chris; Goldader, Jeff (20 August 2011). "Thirty-four years after launch, Voyager 2 continues to explore". nasaspaceflight.com. Retrieved 15 July 2015.
  10. ^ a b Cranor, David (4 December 2017). "When the Voyagers passed the Pioneers". Nothing More Powerful. Retrieved 4 December 2017.
  11. ^ "Voyager - The Interstellar Mission". Jet Propulsion Laboratory. NASA.
  12. ^ "Voyager 1 has left the Solar System. Will we ever overtake it?".
  13. ^ a b c "Voyager – Mission Status". Jet Propulsion Laboratory. NASA. Retrieved November 4, 2019.
  14. ^ a b c "Spacecraft escaping the Solar System". Heavens Above. Chris Peat. Retrieved 2021-08-29.
  15. ^ Talbert, Tricia (2021-04-15). "NASA's New Horizons Reaches a Rare Space Milestone". NASA. Retrieved 2021-04-18.
  16. ^ "What is escape velocity?". www.qrg.northwestern.edu. Retrieved 2018-10-25.
  17. ^ "solar escape velocity at 100 AU - Wolfram|Alpha". www.wolframalpha.com.
  18. ^ "WikiHow: How to Calculate Escape Velocity". Retrieved 2018-12-17.
  19. ^ "NASA - NASA Glenn Pioneer Launch History". NASA.
  20. ^ a b c "rockets - Where are the upper stages for the Voyager/Pioneer stages? - Space Exploration Stack Exchange". stackexchange.com.
  21. ^ a b Stern, Alan; Guo, Yanping (October 28, 2010). "Where Is the New Horizons Centaur Stage?". Johns Hopkins University Applied Physics Laboratory.
  22. ^ "Star 48b Third-stage Motor - Unmanned Spaceflight.com". unmannedspaceflight.com.
  23. ^ Malik, Tariq (26 January 2006). "Derelict Booster to Beat Pluto Probe to Jupiter". Space.com. Retrieved 2 January 2019.
  24. ^ Pierre Bauduin. "New Horizons". weebau.com.
  25. ^ a b "Deep space probes and other manmade objects beyond near Earth space". johnstonsarchive.net.
  26. ^ Scharf, Caleb A. (February 25, 2013). "The Fastest Spacecraft Ever?". Scientific American. Retrieved July 12, 2017.
  27. ^ Neufeld, Michael (July 10, 2015). "First Mission to Pluto: The Difficult Birth of New Horizons". Smithsonian. Retrieved April 21, 2018.
  28. ^ (PDF). International Launch Services. January 2006. Archived from the original (PDF) on September 9, 2016. Retrieved April 21, 2018.
  29. ^ https://usspaceobjectsregistry.state.gov/Lists/SpaceObjects/DispFormaspx?ID=3348.html[permanent dead link]
  30. ^ "Solar orbiter Ulysses ends mission after 18 years". Reuters. July 2009.

External links

  • Spacecraft escaping the Solar System in heavens-above.com
  • NASA = Explaining planetary gravity assists
  • Future stellar flybys of the Voyager and Pioneer spacecraft determined using Gaia Data Release 2

January 18, 2023
list, artificial, objects, leaving, solar, system, artificial, objects, leaving, solar, system, space, probes, upper, stages, their, launch, vehicles, launched, nasa, three, probes, voyager, voyager, horizons, still, functioning, regularly, contacted, radio, c. The artificial objects leaving the Solar System are all space probes and the upper stages of their launch vehicles all launched by NASA Three of the probes Voyager 1 Voyager 2 and New Horizons are still functioning and are regularly contacted by radio communication while Pioneer 10 and Pioneer 11 are now derelict In addition to these spacecraft some upper stages and de spin weights are leaving the Solar System assuming they continue on their trajectories The red and green arrows indicate the positions of Voyager 1 and Pioneer 10 respectively at the end of 2008 the blue shell indicates the estimated size of the termination shock they have entered whereas the grey annulus shows the Kuiper belt The yellow shell indicates one light day distance from the Sun and the yellow arrow the vernal point Click on image for larger view and links to other scales Trajectories of distant spacecraft from launch to 2030Top Polar view Bottom Equatorial view Plot of Voyager 2 s heliocentric velocity against its distance from the Sun illustrating the use of gravity assist to accelerate the spacecraft by Jupiter Saturn and Uranus and finally its encounter with Neptune s Triton Gravity assists are akin to bouncing the spacecraft off a planet but because the planet is moving it doesn t just bounce but is pushed by the planet like when a baseball is hit by a moving baseball bat These objects are leaving the Solar System because their velocity and direction are taking them away from the Sun and at their distance from the Sun its gravitational pull is not sufficient to pull these objects back or into orbit They are not impervious to the gravitational pull of the Sun and are being slowed but are still traveling in excess of escape velocity to leave the Solar System and coast into interstellar space Contents 1 Planetary exploration probes 2 Speed and distance from the Sun 3 Propulsion stages 4 Future 4 1 Ulysses 5 Gallery 6 See also 7 References 8 External linksPlanetary exploration probes EditPioneer 10 launched in 1972 flew past Jupiter in 1973 and is heading in the direction of Aldebaran 65 light years away in the constellation of Taurus Contact was lost in January 2003 and it is estimated to have passed 132 astronomical units AU one AU is roughly the average distance between Earth and the Sun 150 million kilometers 93 million miles 1 Pioneer 11 launched in 1973 flew past Jupiter in 1974 and Saturn in 1979 Contact was lost in November 1995 and it is estimated to be at around 107 AU 2 The spacecraft is headed toward the constellation of Aquila northwest of the constellation of Sagittarius Barring an incident Pioneer 11 will pass near one of the stars in the constellation in about 4 million years 3 Voyager 2 launched in August 1977 flew past Jupiter in 1979 Saturn in 1981 Uranus in 1986 and Neptune in 1989 The probe left the heliosphere for interstellar space at 119 AU on 5 November 2018 4 Voyager 2 is still active It is not headed toward any particular star although in roughly 40 000 years it should pass 1 7 light years from the star Ross 248 5 If undisturbed for 296 000 years it should pass by the star Sirius at a distance of 4 3 light years Voyager 1 launched in September 1977 flew past Jupiter in 1979 and Saturn in 1980 making a special close approach to Saturn s moon Titan The probe passed the heliopause at 121 AU on 25 August 2012 to enter interstellar space 6 Voyager 1 is still active It is headed towards an encounter with star Gliese 445 AC 79 3888 which lies 17 6 light years from Earth in about 40 000 years 7 New Horizons launched in 2006 the probe flew past Jupiter in 2007 and Pluto on 14 July 2015 It flew past the Kuiper belt object 486958 Arrokoth on January 1 2019 as part of the Kuiper Belt Extended Mission KEM 8 Although other probes were launched first Voyager 1 has achieved a higher speed and overtaken all others Voyager 1 overtook Voyager 2 a few months after launch on 19 December 1977 9 It overtook Pioneer 11 in 1983 10 and then Pioneer 10 becoming the probe farthest from Earth on February 17 1998 11 Voyager 2 is moving faster than all other probes launched before it it overtook Pioneer 11 in the late 1980s and will overtake Pioneer 10 in 2023 12 Depending on how the Pioneer anomaly affects it New Horizons will also probably pass the Pioneer probes but will need many years to do so It will not overtake Pioneer 11 until the 22nd century will not overtake Pioneer 10 until the end of that century and will never overtake the Voyagers 10 Speed and distance from the Sun EditTo put the distances in the table in context Pluto s average distance semi major axis is about 40 AU Name Launched Distance to the Sun AU As of 2022 13 14 Speed km s 13 14 Voyager 1 1977 158 62 16 9Pioneer 10 1972 132 54 11 9Voyager 2 1977 132 19 15 3Pioneer 11 1973 109 19 11 2New Horizons 2006 58 95 13 8Note Data above as of December 31 2022 Source JPL 13 heavens above com 14 and for New Horizons 15 Solar escape velocity is a function of distance r from the Sun s center given by v e 2 G M s u n r displaystyle v e sqrt frac 2GM sun r where the product G Msun is the heliocentric gravitational parameter The initial speed required to escape the Sun from its surface is 618 km s 1 380 000 mph 16 and drops down to 42 1 km s 94 000 mph at Earth s distance from the Sun 1 AU and 4 21 km s 9 400 mph at a distance of 100 AU 17 18 Voyager 1 and 2 speed and distance from the Sun Pioneer 10 and 11 speed and distance from the Sun New Horizons speed and distance from the Sun In order to leave the Solar System the probe needs to reach the local escape velocity After leaving Earth the Sun s escape velocity is 42 1 km s In order to reach this speed it is highly advantageous to also use the orbital speed of the Earth around the Sun which is 29 78 km s By later passing near a planet a probe can gain extra speed with a gravity assist Propulsion stages Edit A Star 48 rocket motor like the one used to launch the New Horizons probe Every planetary probe was placed into its escape trajectory by a multistage rocket the last stage of which ends up on nearly the same trajectory as the probe it launched Because these stages cannot be actively guided their trajectories are now different from the probes they launched the probes were guided with small thrusters that allow course changes However in cases where the spacecraft acquired escape velocity because of a gravity assist the stages may not have a similar course and there is the extremely remote possibility that they collided with something The stages on an escape trajectory are Pioneer 10 third stage a TE364 4 variant of the Star 37 solid fuel rocket 19 Voyager 1 fourth stage a Star 37E solid fuel rocket 20 Voyager 2 fourth stage a Star 37E solid fuel rocket 20 New Horizons third stage a Star 48B solid fuel rocket is on a similar escape trajectory out of the Solar System to New Horizons even arriving at Jupiter six hours before New Horizons On October 15 2015 it passed Pluto s orbit at a distance of 213 million kilometers over 1 AU distant from Pluto 21 22 This was four months after New Horizons Pluto flyby 23 In addition two small yo yo de spin weights on wires were used to reduce the spin of the New Horizons probe prior to its release from the third stage rocket Once the spin rate was lowered these masses and the wires were released and so are also on an escape trajectory out of the Solar System 24 25 None of the above objects are trackable they have no power or radio antennas spin uncontrollably and are too small to be detected Their exact positions are unknowable beyond their projected Solar System escape trajectories The third stage of Pioneer 11 is thought to be in solar orbit because its encounter with Jupiter would not have resulted in escape from the Solar System 20 better source needed Pioneer 11 gained the required velocity to escape the Solar System in its subsequent encounter with Saturn dubious discuss On January 19 2006 the New Horizons spacecraft to Pluto was launched directly into a solar escape trajectory at 16 26 kilometers per second 58 536 km h 36 373 mph from Cape Canaveral using an Atlas V and the Common Core Booster Centaur upper stage and Star 48B third stage 26 New Horizons passed the Moon s orbit in just nine hours 27 28 The subsequent encounter with Jupiter only increased its velocity and just enabled the probe to arrive at Pluto three years earlier than without this encounter Thus the only objects to date to be launched directly into a solar escape trajectory were the New Horizons spacecraft its third stage and the two de spin masses The New Horizons Centaur second stage is not escaping it is in a 2 83 year heliocentric solar orbit 21 The Pioneer 10 and 11 and Voyager 1 and 2 Centaur second stages are also in heliocentric orbits 25 29 Future EditGiven the huge emptiness of interstellar space all the objects listed here are likely to continue into deep space in timelines that barring the exceptionally unlikely chance of their colliding with or being collected by another object could outlast even the Main Sequence existence of the Sun s life billions of years hence They do not however have enough velocity to escape the Milky Way galaxy into intergalactic space Ulysses Edit In 1990 Ulysses was launched and was designed to study the Sun its extended mission ended in 2008 Ulysses is currently in a 79 inclination orbit around the Sun with its apoapsis crossing the orbit of Jupiter In November 2098 it will have another close fly by with Jupiter crossing between the orbits of Europa and Ganymede After this slingshot maneuver it will possibly enter a hyperbolic trajectory around the Sun and eventually leave the Solar System 30 Ulysses is now switched off as its RTG power supply has run down and so is uncontactable and cannot be tracked or guided in any way Its exact trajectory is therefore unknowable as factors such as solar radiation pressure could significantly alter its encounter path Gallery Edit Photograph of Voyager 1 Voyager 2 Artist s concept of Pioneer 10 Pioneer 11 Artist s concept of Pioneer 10 near Jupiter Artist s concept of New Horizons approaching Pluto Artist s concept of New Horizons near Pluto See also EditInterstellar probe Intergalactic travel List of artificial objects in heliocentric orbit List of artificial objects on extraterrestrial surfaces Deliberate crash landings on extraterrestrial bodies Oberth effectReferences Edit Pioneer 10 Live Position and Data TheSkyLive com Retrieved 2019 08 11 Pioneer 11 Live Position and Data TheSkyLive com Retrieved 2019 08 11 The Pioneer Missions NASA 3 March 2015 Gill Victoria December 10 2018 Nasa s Voyager 2 probe leaves the Solar System BBC News Retrieved December 10 2018 Voyager Mission Interstellar Mission NASA June 22 2007 Retrieved August 14 2013 Harwood William September 12 2013 Voyager 1 finally crosses into interstellar space CBS News Wall Mike 13 September 2015 Interstellar Traveler NASA s Voyager 1 Probe On 40 000 Year Trek to Distant Star Retrieved 4 June 2018 Brown Dwayne 2016 07 01 New Horizons Receives Mission Extension to Kuiper Belt Dawn to Remain at Ceres Press release Washington DC NASA Retrieved 2016 10 06 Gebhardt Chris Goldader Jeff 20 August 2011 Thirty four years after launch Voyager 2 continues to explore nasaspaceflight com Retrieved 15 July 2015 a b Cranor David 4 December 2017 When the Voyagers passed the Pioneers Nothing More Powerful Retrieved 4 December 2017 Voyager The Interstellar Mission Jet Propulsion Laboratory NASA Voyager 1 has left the Solar System Will we ever overtake it a b c Voyager Mission Status Jet Propulsion Laboratory NASA Retrieved November 4 2019 a b c Spacecraft escaping the Solar System Heavens Above Chris Peat Retrieved 2021 08 29 Talbert Tricia 2021 04 15 NASA s New Horizons Reaches a Rare Space Milestone NASA Retrieved 2021 04 18 What is escape velocity www qrg northwestern edu Retrieved 2018 10 25 solar escape velocity at 100 AU Wolfram Alpha www wolframalpha com WikiHow How to Calculate Escape Velocity Retrieved 2018 12 17 NASA NASA Glenn Pioneer Launch History NASA a b c rockets Where are the upper stages for the Voyager Pioneer stages Space Exploration Stack Exchange stackexchange com a b Stern Alan Guo Yanping October 28 2010 Where Is the New Horizons Centaur Stage Johns Hopkins University Applied Physics Laboratory Star 48b Third stage Motor Unmanned Spaceflight com unmannedspaceflight com Malik Tariq 26 January 2006 Derelict Booster to Beat Pluto Probe to Jupiter Space com Retrieved 2 January 2019 Pierre Bauduin New Horizons weebau com a b Deep space probes and other manmade objects beyond near Earth space johnstonsarchive net Scharf Caleb A February 25 2013 The Fastest Spacecraft Ever Scientific American Retrieved July 12 2017 Neufeld Michael July 10 2015 First Mission to Pluto The Difficult Birth of New Horizons Smithsonian Retrieved April 21 2018 New Horizons Mission Overview PDF International Launch Services January 2006 Archived from the original PDF on September 9 2016 Retrieved April 21 2018 https usspaceobjectsregistry state gov Lists SpaceObjects DispFormaspx ID 3348 html permanent dead link Solar orbiter Ulysses ends mission after 18 years Reuters July 2009 External links EditSpacecraft escaping the Solar System in heavens above com NASA Explaining planetary gravity assists Future stellar flybys of the Voyager and Pioneer spacecraft determined using Gaia Data Release 2 Portals Astronomy Stars Spaceflight Outer space Solar System Retrieved from https en wikipedia org w index php title List of artificial objects leaving the Solar System amp oldid 1134221710, wikipedia, wiki, book, books, library,

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