The Physics Factbook™
Edited by Glenn Elert -- Written by his students
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|Bibliographic Entry||Result |
|McGraw-Hill Encyclopedia of Science and Technology. vol. 17. New York: McGraw-Hill, 1992. 138-141.||"Voyager 1 is now leaving the solar system, rising above the ecliptic plane at an angle of about 35° at a rate of about 3.2 × 108 mi (5.2 × 108 km) a year …. Voyager 2 is also leaving the solar system, diving below the ecliptic plane at an angle of about 48° at a rate of about 2.9 × 108 mi (4.7 × 108 km) a year."||16.49 km/s |
|Voyager Mission Status. Jet Propulsion Laboratory. 1995. [This page no longer exists at this URL.]||"The Voyager 1 spacecraft is departing the solar system at a speed of 17.46 km/s …. The Voyager 2 spacecraft is departing the solar system at a speed of 16.08 km/s."||17.46 km/s |
|Voyager Mission Operations Status Report: Range, Velocity and Round Trip Light Time. Voyager Project. Jet Propulsion Laboratory (JPL). Pasadena, CA.||"Velocity Relative to Sun (km/sec) as of 6/13/97: |
Voyager 1 17.374
Voyager 2 15.957"
|17.374 km/s |
Voyager 1 was launched in September 1977, a month after when Voyager 2which was launched in August 1977. Voyagers 1 and 2 are different fromother space probes in that they were designed to go further than all other spacecraft and leave the solar system. My goal was to find their speeds as they leavethe solar system.
After doing some research on the subject, I found that the information fromthe two different sources which I had, gave me conflicting measurements. In McGraw Hill's Encyclopedia of Science and Technology it said that the speedof Voyager 1 as it leaves the solar system is 16.49 km/s. But in thearticle, "Voyager MissionStatus,"by NASA it says that Voyager 1 is leaving the solar systemat a speed of 17.46 km/s. The same differences appeared when I compared bothsources for the speed of Voyager 2. McGraw-Hill says 14.90 km/s, andNASA says 16.08 km/s.
If it were up to I would have to go with the numbers that NASA gave. Due tothe fact that the original numbers that Mc Graw's Encyclopedia gave mewere 5.2 × 108 km/yr for Voyager 1 and 4.7 × 108 km/yrfor Voyager 2. When I saw these units I had to convert them to km/s. Butthe resultant conversions are too close to the numbers that was supplied by NASA.Another reason why they could differ is probably because both NASA and McGraw-Hillused different methods to find the speeds of the Voyager space probes as theyleave the solar system.
Patrice Pean -- 1997
|Bibliographic Entry||Result |
|NASA/JPL. Advances in the Astronautical Sciences. AAS Publications, 1981 cited in Hall, Stephen S. Mapping the Next Millenium. New York: Random House, 1992. 50.||"Voyager 1 3.50 AU/yr |
Voyager 2 2.92 AU/yr, 2.90 AU/yr, 3.04 AU/yr, 3.24 AU/yr, 3.39 AU/yr [highlighted], 3.76 AU/yr, 4.09 AU/yr, 3.96 AU/yr
Pioneer 10: 2.39 AU/yr
Pioneer 11: 2.22 AU/yr"
|16.6 km/s |
Editor's Supplement -- 2000
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