Asteroid 1950 DA's encounter with Earth in A.D. 2880
Explore the source record for details and available documents.
asteroid hazard 1950 DA↗
Engineering topics
Klemola, A. R.
Publications and source records attributed to Klemola, A. R..
Asteroid 1950 DA's encounter with Earth in 2880: physical limits of collision probability prediction
Explore the source record for details and available documents.
asteroids orbit dynamics impact hazards numerical ↗
Limit on possible narrow rings around Jupiter
An upper limit to the optical depth of the Jovian ring at high spatial resolution, determined from stellar occultation data, is reported. The spatial resolution of the observation is limited to about 13 km in Jupiter's equatorial plane by the projection of the Fresnel zone on the equatorial plane in the radial direction. At this resolution, the normal optical depth limit is about 0.008. This limit applies to a strip in the Jovian equatorial plane that crosses the orbits of Amalthea, 1979J1, 1979J3, and the ring. An upper limit on the number density of kilometer-size boulders has been set at one per 11.000 sq km in the equatorial plane.
Dunham, E.↗
Predicted occultations by Neptune - 1981-1984
Predictions are presented for eight occultations by and appulses to Neptune from 1981 through 1984. Of special interest are a near-central occultation of Hyd - 22 deg 58794 on June 15, 1983, and a July 22, 1984 occultation of SAO 186001.
Mink, D. J.↗
Predicted occultations by Uranus - 1981-1984
Predictions are presented for 11 occultations by and appulses to Uranus and its ring system for ten stars from 1981 through 1984. The brightest stars are occulted on April 26, 1981 (BD - 19 deg 4222) and on April 22, 1982 (Hyd - 20 deg 51699). The ring system occults the same star twice during March 1983 (Hyd - 21 deg 64352).
Klemola, A. R.↗