The contraction of Io's orbit

Abstract

view Abstract Citations (17) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The contraction of Io's orbit Goldstein, S. J., Jr. ; Jacobs, K. C. Abstract The authors reanalyze the Picard-Roemer eclipse observations of Io from 1668 to 1678, using a new method of calculating ephemeris time corrections that is independent of lunar theory. They then compare the old orbital longitude and mean motion to the values deduced from two modern theories based upon eclipse observations made in the twentieth century. Over a time base approaching 250 yr the authors find consistent results with both modern theories and with both types of comparisons (longitude and mean motion). Io's orbital period is decreasing: P/P = -4.6×10-10yr-1 (±20%). The corresponding decrease in the semimajor axis of Io's Keplerian orbit is 13 cm yr-1. Tidal heating of Io removes energy from Io's orbit and causes the orbital acceleration. Publication: The Astronomical Journal Pub Date: July 1986 DOI: 10.1086/114151 Bibcode: 1986AJ.....92..199G Keywords: Io; Long Term Effects; Orbit Calculation; Planetary Orbits; Acceleration (Physics); Eclipses; Ephemeris Time; Kepler Laws; Tides; Lunar and Planetary Exploration full text sources ADS | Related Materials (1) Erratum: 1987AJ.....94.1694G