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  • 1
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    Orbits of the six new satellites of Neptune (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Orbital elements are presented for the six small satellites of Neptune, 1989N1 through 1989N6, discovered by Voyager 2. Details of the image and orbit analyses are examined. The solution for the orbits of the six satellites is presented in terms of geometric classical Keplerian elements. All six are in nearly circular direct orbits; most of the satellites have low inclinations, except the innermost, 1989N6, which is inclined at 4.7 deg to Neptune's equator.
    Keywords: ASTRONOMY
    Type: Astronomical Journal (ISSN 0004-6256); 101; 1511-151
    Format: text
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  • 2
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    Orbits of the ten small satellites of Uranus (1987)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Orbital elements are presented for the ten small satellites discovered by Voyager 2 at Uranus. These ten new satellites, whose provisional IAU designations are 1985UI and 1986UI through 1986U9, lie for the most part in equatorial, circular orbits; the most notable exception is 1986U8, the outer epsilon-ring shepherd, whose eccentricity e = 0.0101. Unlike the Voyager discoveries at Saturn, which included two co-orbiting satellites and three librators, the ten small Uranian satellites all have quite different semimajor axes.
    Keywords: ASTRONOMY
    Type: Astronomical Journal (ISSN 0004-6256); 93; 1268-127
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  • 3
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    Aperture synthesis using orbiting telescopes (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A study was carried out to determine the feasibility, with current technology, of performing aperture synthesis using two telescopes orbiting the earth in coordinated orbits separated by approximately 10 m to 1 km. The objective was to determine whether there is a practical alternative to a very large, deployed, servo-controlled submillimeter telescope (i.e., the Large Deployable Reflector) for obtaining high-resolution submillimeter images of astronomical sources. It is found that suitable classes of orbits exist which can provide good UV coverage over the entire sky and the real-time correlation of wideband signals can be performed in orbit using current technology. The most difficult task appears to be the real-time determination of the orientation of the baseline vector in a stable coordinate system. A plausible scheme has been identified for the determination of an arbitrary direction to within 0.003 arcsec in an astrometric coordinate system. This scheme not only makes submillimeter interferometric image reconstruction possible but should also have numerous other applications.
    Keywords: ASTRONOMY
    Type: Radio Science (ISSN 0048-6604); 20; 1105-111
    Format: text
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  • 4
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    Theory of motion of Saturn's coorbiting satellites (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: A simple analytic theory describing the 1:1 orbital resonance is presented and applied to Saturn's coorbiting pair, 1980S1 and 1980S3. These satellites are very small and can approach to within 15,000 km, but are prevented from passing each other by their mutual gravitational interaction. The long-term stability of the S1-S3 orbital configuration is discussed in this paper, and a tie between the 1966 and 1980 observations is established.
    Keywords: ASTRONOMY
    Type: Icarus (ISSN 0019-1035); 53; March 19
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  • 5
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    Deep-space navigation applications of improved ground-based optical astrometry (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Improvements in ground-based optical astrometry will eventually be required for navigation of interplanetary spacecraft when these spacecraft communicate at optical wavelengths. Although such spacecraft may be some years off, preliminary versions of the astrometric technology can also be used to obtain navigational improvements for the Galileo and Cassini missions. This article describes a technology-development and observational program to accomplish this, including a cooperative effort with U.S. Naval Observatory Flagstaff Station. For Galileo, Earth-based astrometry of Jupiter's Galilean satellites may improve their ephemeris accuracy by a factor of 3 to 6. This would reduce the requirements for onboard optical navigation pictures, so that more of the data transmission capability (currently limited by high-gain antenna deployment problems) can be used for science data. Also, observations of European Space Agency (ESA) Hipparcos stars with asteroid 243 Ida may provide significantly improved navigation accuracy for a planned August 1993 Galileo spacecraft encounter.
    Keywords: ASTRONOMY
    Type: The Telecommunications and Data Acquisition; p 118-127
    Format: application/pdf
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  • 6
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    Orbits of Saturn's F ring and its shepherding satellites (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Keywords: ASTRONOMY
    Type: Icarus; 53; Jan. 198
    Format: text
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  • 7
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    Orbits of the small satellites of Saturn (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Orbital parameter values determined from Voyager 1 imaging data for the small Saturn satellites 1980S1, 1980S3, 1980S6, 1980S26, 1980S27, and 1980S28 are presented. The dynamic model used for all satellites is a Keplerian ellipse, whose apse and node precess under the influence of the central-body harmonics. In evaluating eccentricity and inclination, it was found that the largest source of error is the difficulty of making measurements when satellites are at, or approaching, transit.
    Keywords: ASTRONOMY
    Type: Science; 212; Apr. 10
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  • 8
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    Orbits of the small inner satellites of Jupiter (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Voyager images led to the discovery of the three small inner satellites of Jupiter, Adrastea, Metis, and Thebe. Attention is presently given to orbital parameter estimates and associated uncertainties that have been determined from Voyager imaging data, the achievable angular accuracy of which is about 0.00005 rad.
    Keywords: ASTRONOMY
    Type: Icarus (ISSN 0019-1035); 58; 178-181
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  • 9
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    The Filled Arm Fizeau Telescope (FFT) (1991)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Attention is given to the design of a Mills Cross imaging interferometer in which the arms are fully filled with mirror segments of a Ritchey-Chretien primary and which has sensitivity to 27th magnitude per pixel and resolution a factor of 10 greater than Hubble. The optical design, structural configuration, thermal disturbances, and vibration, material, control, and metrology issues, as well as scientific capabilities are discussed, and technology needs are identified. The technologies under consideration are similar to those required for the development of the other imaging interferometers that have been proposed over the past decade. A comparison of the imaging capabilities of a 30-m diameter FFT, an 8-m telescope with a collecting area equal to that of the FFT, and the HST is presented.
    Keywords: ASTRONOMY
    Type: Space Astronomical Telescopes and Instruments; Apr 01, 1991 - Apr 04, 1991; Orlando, FL; United States
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  • 10
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    Ephemerides of the major Neptunian satellites determined from earth-based astrometric and Voyager imaging observations (1990)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The Voyager project used Neptunian satellite ephemerides to support both navigation and acquisition of scientific data. The development of postencounter ephemerides for the satellites Triton, Nereid, and 1989N1 is discussed. Primary results are the final set of model parameters which generate orbits that best fit both the earth-based satellite observations and data acquired by Voyager. The ephemerides are compared with those generated preencounter, and the accuracy of the final ephemerides is assessed. Mean orbital elements are also provided as a geometrical representation for the satellite orbits.
    Keywords: ASTRONOMY
    Type: AIAA PAPER 90-2881 , AIAA/AAS Astrodynamics Conference; Aug 20, 1990 - Aug 22, 1990; Portland, OR; United States
    Format: text
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