26. S. Chandrasekhar, Ellipsoidal Figures of Equilibrium

• Main Authors: D. E. Smith, M. T. Zuber, G. A. Neumann, F. G. Lemoine, G. A. Neu, J. Geo, S. C. Solomon, R. P. Comer, J. W. Head, S. J. Mackwell, M. E. Zimmerman, D. L. Kohlstedt, J. Daemen, R. Schultz, J. A. Burns, V. S. Safranov, Mon Not, R. Astron, R. A. F. Grieve, P. B. Robertson, M. R. Dence
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Aitken; Ida; South Pole; Tive; South pole
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1032.1869; http://science.sciencemag.org/content/sci/277/5331/1495.full.pdf

34. There are a few known other instances where Dt /R is suspected to be close to unity. The lunar South Pole– Aitken basin, presently about 2500 km in diameter, has an estimated Dt /R of 0.7 (20), the putative Borea-lis Basin on Mars has an estimated Dt /R of 0.87 [D. E. Wilhelms and S. W. Squyres, Nature 309, 138 (1984); G. E. McGill, J. Geophys. Res. 94, 2753 (1989)], and the 10-km diameter depression at Deimos’s south pole, which has been suggested to be a simple crater [P. C. Thomas, Icarus 77, 248 (1989)], has an estimat-ed Dt /R of;1.5. The 15-km depression Wien Regio on asteroid 243 Ida has a Dt /R of 0.95, if the asteroid’s mean radius is considered [R. Greenberg et al., ibid. 120, 106 (1996)]. However, Wien Regio is located on one end of this very elongate object, where the effec-tive radius of curvature is;10 km; thus, Wien Regio effectively has a Dt /R of;1.5. Several 10-km craters on the other, even smaller end of Ida have Dt /R’s of about 1 to 1.2.