Stiles et al. 2008
Stiles, B.W., R.L. Kirk, R.D. Lorenz, S. Hensley, E. Lee, S.J. Ostro, M.D. Allison, P.S. Callahan, Y. Gim, L. Iess, P. Perci del Marmo, G. Hamilton, W.T.K. Johnson, R.D. West, and Cassini RADAR Team, 2008: Determining Titan's spin state from Cassini RADAR images. Astron. J., 135, 1669-1680, doi:10.1088/0004-6256/135/5/1669.
For some 19 areas of Titan's surface, the Cassini RADAR instrument has obtained synthetic aperture radar (SAR) images during two different flybys. The time interval between flybys varies from several weeks to two years. We have used the apparent misregistration (by 10-30 km) of features between separate flybys to construct a refined model of Titan's spin state, estimating six parameters: north pole right ascension and declination, spin rate, and these quantities' first time derivatives We determine a pole location with right ascension of 39.48 degrees and declination of 83.43 degrees corresponding to a 0.3 degree obliquity. We determine the spin rate to be 22.5781 deg/day or 0.001 deg/day faster than the synchronous spin rate. Our estimated corrections to the pole and spin rate exceed their corresponding standard errors by factors of 80 and 8, respectively. We also found that the rate of change in the pole right ascension is -30 deg/century, ten times faster than right ascension rate of change for the orbit normal. The spin rate is increasing at a rate of 0.05 deg/day per century. We observed no significant change in pole declination over the period for which we have data. Applying our pole correction reduces the feature misregistration from tens of km to 3 km. Applying the spin rate and derivative corrections further reduces the misregistration to 1.2 km.
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Stiles, B.W., Kirk, R.L., Lorenz, R.D., Hensley, S., Lee, E., Ostro, S.J., Allison, M.D., Callahan, P.S., Gim, Y., Iess, L., Perci del Marmo, P., Hamilton, G., Johnson, W.T.K., West, R.D., and Cassini RADAR Team: Determining Titan's spin state from Cassini RADAR images, Astron. J., 135, 1669-1680, doi:10.1088/0004-6256/135/5/1669, 2008.
Stiles, B.W., R.L. Kirk, R.D. Lorenz, S. Hensley, E. Lee, S.J. Ostro, M.D. Allison, P.S. Callahan, Y. Gim, L. Iess, P. Perci del Marmo, G. Hamilton, W.T.K. Johnson, R.D. West, and Cassini RADAR Team (2008), Determining Titan's spin state from Cassini RADAR images, Astron. J., 135, 1669-1680, doi:10.1088/0004-6256/135/5/1669.
Stiles, B.W., R.L. Kirk, R.D. Lorenz, S. Hensley, E. Lee, S.J. Ostro, M.D. Allison, P.S. Callahan, Y. Gim, L. Iess, P. Perci del Marmo, G. Hamilton, W.T.K. Johnson, R.D. West, and Cassini RADAR Team, 2008: Determining Titan's spin state from Cassini RADAR images. Astron. J., 135, 1669-1680, doi:10.1088/0004-6256/135/5/1669.
Stiles, B.W., et al. 2008, Astron. J., 135, 1669, doi:10.1088/0004-6256/135/5/1669.
Stiles BW, Kirk RL, Lorenz RD, Hensley S, Lee E, Ostro SJ, Allison MD, Callahan PS, Gim Y, Iess L, Perci del Marmo P, Hamilton G, Johnson WTK, West RD, Cassini RADAR Team. Determining Titan's spin state from Cassini RADAR images, Astron J 2008;135:1669-1680. doi:10.1088/0004-6256/135/5/1669.
B.W. Stiles, R.L. Kirk, R.D. Lorenz, S. Hensley, E. Lee, S.J. Ostro, M.D. Allison, P.S. Callahan, Y. Gim, L. Iess, P. Perci del Marmo, G. Hamilton, W.T.K. Johnson, R.D. West, Cassini RADAR Team, Astron. J. 135, 1669-1680, doi:10.1088/0004-6256/135/5/1669 (2008).
