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  • Zeitschriften
  • Weitere Quellen  (1.316)
  • ASTRONOMY  (1.310)
  • Meteorology and Climatology
  • 1985-1989  (1.316)
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  • 1
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    Seafloor hydrothermal activity and spreading rates: the Eocene carbon dioxide greenhouse revisted (1985)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-24
    Beschreibung: A suggestion has been made that enhanced rates of hydrothermal activity during the Eocene could have caused a global warming by adding calcium to the ocean and pumping CO2 into the atmosphere (Owen and Rea, 1984). This phenomenon was purported to be consistent with the predictions of the CO2 geochemical cycle model of Berner, Lasaga and Garrels (1983) (henceforth BLAG). In fact, however, the BLAG model predicts only a weak connection between hydrothermal activity and atmospheric CO2 levels. By contrast, it predicts a strong correlation between seafloor spreading rates and pCO2, since the release rate of CO2 from carbonate metamorphism is assumed to be proportional to the mean spreading rate. The Ecocene warming can be conveniently explained if the BLAG model is extended by assuming that the rate of carbonate metamorphism is also proportional to the total length of the midocean ridges from which the spreading originates.
    Schlagwort(e): Meteorology and Climatology
    Materialart: Geochimica et cosmochimica acta (ISSN 0016-7037); Volume 49; 2541-4
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  • 2
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    Institutional arrangements for the space telescope: A mid-term review (1985)
    In:  CASI
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    Publikationsdatum: 2005-03-01
    Schlagwort(e): ASTRONOMY
    Format: text
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  • 3
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    Optical investigation of Comet Halley (1986)
    In:  CASI
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    Publikationsdatum: 2006-02-14
    Beschreibung: The optical properties of comet p/Halley are being investigated. Initial research has revealed the basic characteristics of the nucleus and provided unique insights into the formation and structure of the coma and the plasma tail. The study is among the most intensive conducted for any comet. The results from comet p/Halley may be useful in the interpretation of results from other comets.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA, Washington Reports of Planetary Astronomy, 1985; p 98-99
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  • 4
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    Table Mountain Observatory support to other programs (1986)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Over 20 asteroids were observed photometrically for period determinations and phase relation studies. These included 1036 Ganymed, the largest Mars-crossing asteroid known, and 1627 Ivar, an earth-approaching asteroid which is a potential space mission target. Doppler images of P/Halley from TMO were obtained. Initial testing of the JPL/TMO CCD camera system has supported by imaging P/Giacobini-Zinner and P/Halley.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA, Washington Reports of Planetary Astronomy, 1985; p 94
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  • 5
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    CCD scanning for asteroids and comets (1986)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: A change coupled device (CCD) is used in a scanning mode to find new asteroids and recover known asteroids and comet nuclei. Current scientific programs include recovery of asteroids and comet nuclei requested by the Minor Planet Center (MPC), discovery of new asteroids in the main belt and of unusual orbital types, and follow-up astrometry of selected new asteroids discovered. The routine six sigma limiting visual magnitude is 19.6 and slightly more than a square degree is scanned three times every 90 minutes of observing time during the fortnight centered on New Moon. Semiautomatic software for detection of moving objects is in routine use; angular speeds as low as 11.0 arcseconds per hour were distinguished from the effects of the Earth's atmosphere on the field of view. A typical set of three 29-minute scans near the opposition point along the ecliptic typically nets at least 5 new main-belt asteroids down to magnitude 19.6. In 18 observing runs (months) 43 asteroids were recovered, astrometric and photometric data on 59 new asteroids were reported, 10 new asteroids with orbital elements were consolidated, and photometry and positions of 22 comets were reported.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA, Washington Reports of Planetary Astronomy, 1985; p 90-91
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  • 6
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    Photometry of small asteroids and cometary cores (1986)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The first asteroid lightcurves have now been made with a new technique of CCD photometry. The apparent magnitude is fainter (V〉17) than what can be done with the 1.52-m Catalina reflector with a photomultiplier photometer. With the CCD system, however, the lightcurve shows remarkably good repetition; finding the asteroid is, of course, no problem as the object is recognized later by its motion on the CCD. Asteroid 1985RV has a lightcurve amplitude of about 0.4 mag and its period of rotation P = 4.0 hours, on the assumption that the lightcurve has two maxima and two minima as is the case for nearly all other asteroids. The diameter is about 3 km. 1985RV is a first example of results that are being obtained on asteroids and comets with CCD in the Catalinas, Kitt Peak, and Cerro Tololo.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA, Washington Reports of Planetary Astronomy, 1985; p 89
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  • 7
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    Planetary spectroscopy (1986)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Infrared spectroscopic studies of the solar system in support of spacecraft investigations were researched. The studies include the physical behavior of comets, the atmospheres of the gaseous planets, and the solid surfaces of satellites and asteroids. Studies of the gaseous and solid emanations of comets using the techniques of CCD spectroscopy and imaging were focused on. An intensive observational effort was mounted, to observe comet Halley with the recently developed state of the art CCD camera system. Comet P/Giacobini-Zinner was observed. The major emphasis was placed on spectroscopy and a synoptic spectrum at least once a month was obtained. A large number of images of Halley for particular emission species and continuum regions were also obtained. The species in vestigated were: C3 (4060 A), CO+ (4505), C2 (5139), NH2 (5980), H2O+ (6185), OI (6300) and CN (9180).
    Schlagwort(e): ASTRONOMY
    Materialart: NASA, Washington Reports of Planetary Astronomy, 1985; p 87-88
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  • 8
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    High-resolution imaging of solar system objects (1986)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: A very extensive Io sodium imaging program beginning with the first images of the cloud and culminating in comprehensive characterization of the cloud's appearance and behavior as a function of both time and Io's orbital position now forms the basis for a collaborative modeling analysis and a continued observational study with emphasis on understanding how the cloud's behavior is diagnostic of spatial and temporal variations in the physical conditions of the inner Jovian magnetosphere. The sodium cloud was found to have a variety of systematic variations, a pronounced east-west orbital asymmetry, and temporal changes which could be diagnostic of time changes in both Io and its plasma environment. New comet imaging programs initiated at the 3.6-meter Canada-France-Hawaii Telescope draw upon both ultra high time resolution and high spatial resolution imaging capabilities. Seven observing runs between Dec. 1984 and May 1986 were devoted to observing Halley, Giacobini-Zinner, and several other comets. Among these observations were the first images of Halley through IHW filters, and images of Giacobini-Zinner during the ICE encounter which have been directly correlated with ICE magnetic field measurements.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA, Washington Reports of Planetary Astronomy, 1985; p 25
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  • 9
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    High resolution imaging (1986)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Diffraction-limited telescopic observations were obtained of solar system objects and a program of research into Uranus, Neptune, Pluto and the asteroids based upon the data obtained was persued. Two camera systems appropriate for this work were developed. Most importantly, the PAPA photon address camera was developed and proven. Algorithms were developed for both phase and amplitude recovery and were validated on theoretical and laboratory data and to a limited extent on telescopic data. A laboratory simulator was constructed that was used for development but is also available for controlled investigation of image reconstruction. During 1985 two successful expeditions were made to Hawaii and Cerro Tololo and a large body of data on Pluto, Uranus, Neptune and two asteroids are on tape.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA, Washington Reports of Planetary Astronomy, 1985; p 26-27
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  • 10
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    Planet-Crossing Asteroid Search (PCAS) (1986)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: 511 independent fields were photographed with the 0.46m Schmidt during 15 observing runs along with a limited number of 1.2m Schmidt exposures. From these fields 122 new asteroids were reported. Special sets of field using the 1.2m Schmidt are continuing to yield numerous new faint asteroids. The combined result from both telescopes include 4 Mars-crossers, 3 Hungarias, 2 Phocaeas, a unique high inclination object (1985XB), 1 Apollo (1985PA) and Aten (3362) Khufu. Halley was regularly monitored (astrometry and large-scale phenomena) IHW participation. Scientifically value photographs were obtained from both 0.46m and 1.2m Schmidt Telescopes. Other accessible comets were observed including G-Z. Recently a new comet (1986d) was discovered.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA, Washington Reports of Planetary Astronomy, 1985; p 95
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