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Your search keyword '"Geyer, E.H."' showing total 7 results
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7 results on '"Geyer, E.H."'

1. Photometric observations and modeling of Asteroid 1620 Geographos

Author

Magnusson, P., Dahlgreen, M, Barucci, M.A., Jorda, L., Binzel, R.P., Slivan, S.M., Blanco, C., Riccioli, D., Buratti, B.J., Colas, F., Berthier, J., De Angelis, G., Di MartINN, M., Dotto, E., Drummond, J.D., Fink, U., Hicks, M., Grundy, W., Wisniewski, W., Gaftonyuk, N.M., Geyer, E.H., Bauer, T., Hoffmann, F., Ivanova, V., Komitov, B., Donchev, Z., Denchev, P., Krugly, Yu.N., Velichko, F.P., Chiorny, V.G., Lupishko,D.F., Shevchenko, V.G., Kwiatkowski, T., Kryszcznska, A., Lahulla, J.F., Licandro, J., Mendez, O., Mottola, S., Erikson, A., Ostro, S.J., Pravec, P., Pych, W., Tholen, D.J., Whiteley, R., Wild, W.J., Wolf, M., and Sarounova, L.

Subjects
Asteroids -- Orbits, Mechanics, Celestial -- Models, Orbits -- Models, Astronomy, Earth sciences
Published
1996

2. Asteroid 243 ida: groundbased photometry and a pre-Galileo physical model

Author

Binzel, R.P., Slivan, S.M., Magnusson, P., Wisniewski, W.Z., Drummond, J., Lumme, K., Barucci, M.A., Dotto, E., Angeli, C., Lazzaro, D., Mottola, S., Gonano-Beurer, M., Michalowski, T., De Angelis, G., Tholen, D.J., Di Martino, M., Hoffmann, M., Geyer, E.H., and Velichko, F.

Subjects
Asteroids -- Research, Photometry -- Usage, Astronomy, Earth sciences
Abstract

Spin vector and shape of the asteroid 243 Ida were obtained from groundbased photometric observations of the asteroid over seven apparitions from 1980 to 1993. The solutions for the spin vector at ecliptic coordinates are also obtained. The required angles for the study of the low orbital inclination of Ida is restricted by the spin vector ambiguity. The rotation of the asteroid is retrograde and has a sidereal period of 4.6336 hours. The axial ratios are 1.82 and 1.15, as revealed by the ellipsoid model.

Published
1993

3. Postperiphelion spectra and images of Comet Wilson (1986l) obtained with a focal reducer

Author

Prasad, C. Debi, Jockers, K., and Geyer, E.H.

Subjects
Comets -- Spectra, Astronomical spectroscopy -- Research, Astronomy, Earth sciences
Abstract

Measurements of the postperihelion spectra and images of Comet Wilson made by the MPAE/Hoher List focal reducer-based CCD camera and grism spectrometer is reported. Comet Wilson exhibits the characteristics of a new comet. Comet Wilson has a ray structured tail approximately 40,000 km long based on carbon monoxide ion emissions. The water and carbon monoxide ion ratios at different distances are presented. Continuum profile has sunward assymmetry and dust ejection complementary produces a sunward fanlike emission.

Published
1992

4. Asteroid 243 Ida: Groundbased Photometry and a Pre-Galileo Physical Model

Author

Binzel, R.P.(1), Slivan, S.M.(1), Magnusson, P.(2), Wisniewski, W.Z.(3), Drummond, J.(4), Lumme, K.(5), Barucci, M.A.(6), Dotto, E.(6), Angeli, C. (6), Lazzaro, D.(6), Mottola, s., Gonano-Beurer, M., Michalowski, T.(7), Angelis, G. de (8), Tholen, D.J.(9), Martino, M. di (10), Hoffmann, M.(11), and Geyer, E.H.(11)

Published
1993

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