Search Publications
Minimal Aerosol Loading and Global Increases in Atmospheric Ozone during the 1996-1997 Martian Northern Spring Season
Wolff, Michael J.; Clancy, R. Todd; James, Philip B.
We employed the Hubble Space Telescope (HST) Faint Object Spectrograph (FOS) to observe middle ultraviolet (220-330 nm) spectral scans of Mars for two periods during the 1996-1997 northern spring season. Analysis of these data yields quantitative measurements of atmospheric column opacities for aerosols and ozone over a wide range of latitudes (40…
Seasonal Change on Titan Observed with the Hubble Space Telescope WFPC-2
Lorenz, Ralph D.; Lemmon, Mark T.; Smith, Peter H. +1 more
Recent observations with the Wide-Field Planetary Camera (WFPC-2) on the Hubble Space Telescope (HST) show an unexpectedly rapid change in the atmospheric albedo contrast between the north and south hemispheres. In 1994 at blue wavelengths, the north was around 15% brighter than the south, and was expected to fall to about 12% in 1997, but has dro…
Post-Perihelion HST Observations of Comet Hale-Bopp (C/1995 O1)
Stern, S. A.; Feldman, P. D.; A'Hearn, M. F. +3 more
Post-perihelion observations of Comet Hale-Bopp (C/1995 O1) were made with the Hubble Space Telescope (HST) on 27 August 1997 (r=2.48 AU; Δ=2.99 AU), 11 November 1997 (r=3.38 AU; Δ=3.31 AU), and 19 February 1998 (r=4.44 AU; Δ=4.40 AU) using the newly installed Space Telescope Imaging Spectrograph (STIS). The STIS CCD was used to image the comet, a…
The Structure and Temporal Stability of Jupiter's Zonal Winds: A Study of the North Tropical Region
Simon, Amy A.
This paper investigates possible long-term zonal wind variations using Voyager (1979), Hubble Space Telescope (HST; 1995, 1997, 1998), and Galileo Orbiter (1997) data that has all been processed and analyzed in the same manner for consistency. Previous attempts to measure the zonal wind profile in Voyager data had yielded inconsistent results for …
Hubble Space Telescope Observations of the Nucleus of Comet 45P/Honda-Mrkos-Pajdusakova and Its Inner Coma
Lamy, P. L.; A'Hearn, M. F.; Toth, I. +1 more
The nucleus of Comet 45P/Honda-Mrkos-Pajdusakova was detected during Hubble Space Telescope observations taken with the Wide-Field Planetary Camera 2 (WFPC2) in February 1996 when the comet was 0.17 AU from the Earth. The high spatial resolution (1 pixel projected to 5.6 km at the distance of the comet) allowed us to separate the signal of the nuc…
Near-Infrared Imaging of Mars from HST: Surface Reflectance, Photometric Properties, and Implications for MOLA Data
Crisp, David; Bell, James F.; Trauger, John T. +5 more
We report initial results from Hubble Space Telescope (HST) images of Mars obtained at a near-IR wavelength of 1042 nm between February 1995 and June 1997. The images provide the highest spatial resolution global near-IR measurements of Mars obtained to date. The data have been calibrated to radiance factor (I/F) to an absolute accuracy of 2 to 5%…
Jovian Stratospheric Hazes: The High Phase Angle View from Galileo
Rages, Kathy; Beebe, Reta; Senske, David
High phase angle Galileo images of Jupiter's limb reveal the presence of stratospheric hazes in the equatorial region (latitude 9°N) and the transition zone at the southern edge of the north polar region (60°N). During orbit E4, images were taken in both violet and near-IR continuum filters, effectively probing Jupiter's stratosphere at two differ…
North Polar Dust Storms in Early Spring on Mars
Wolff, Michael J.; James, Philip B.; Lee, Steven W. +1 more
Observations of Mars during 1996-1997 by the Hubble Space Telescope covered the entire spring season in the northern hemisphere of Mars, which was favorably positioned for viewing the north polar region. This paper reports observations of dust activity during this period. Local dust activity occurred near the edge of the subliming north polar cap …
Imaging Observations of Asteroids with Hubble Space Telescope
Storrs, Alex; Tholen, David; Weiss, Ben +5 more
We present the results of two Hubble Space Telescope (HST) observing programs, consisting of 11 imaging observations of 10 asteroids. The primary focus of the projects was to search for faint companions (satellites) of these asteroids. No binary systems were detected. More specifically, no companions were found at more than 0.1 arcsec separation o…
Transport and Mixing in Jupiter's Stratosphere Inferred from Comet S-L9 Dust Migration
West, Robert A.; Friedson, A. James; Hronek, Amy K. +2 more
We use a series of 230-nm wavelength images acquired with the Hubble Space Telescope Wide Field and Planetary Camera 2 to trace the spreading of debris introduced into Jupiter's stratosphere by the impact of Comet Shoemaker-Levy 9. Impact debris was transported rapidly equatorward by stratospheric winds from the impact latitude at -45° to at least…