منابع مشابه
Observations of molecules in comets
Comets are among the most primitive bodies of the Solar System, and their chemical composition is rich in information on the protosolar nebula and its possible connection with interstellar cloud chemistry. Comets are also a source of light atoms and probably of prebiotic organic molecules for the early Earth. We know better and better cometary volatiles through spectroscopy, mainly at infrared ...
متن کاملIUE Observations of Faint Comets
Ultraviolet spectra of seven comets taken with the same instrument are presented. Comets P/Encke (1980), P/Tuttle (1980 h), P/Stephan-Oterma (1980 g), and Meier (1980 q) were observed during November-December 1980 with the International Ultraviolet Explorer (IUE) satellite observatory, while comets P/Borrelly (1980 i) and Panther (1980 u) were observed with IUE on 6 March 1981. The spectra of t...
متن کاملThe Modern Role of Visual Observations of Comets
This paper reviews the role of past and future visual observations in cometary research. The strengths and limitations of visual observations are explored for the benefit of both investigators who might have to use them and observers who wish to make real contributions to the field. We consider the characteristics of the eye-brain combination as a detector and compare them with modem detectors....
متن کاملGlobal reduction with proper motions for meridian observations
When we deal with astrometric observations spread over periods longer than a few years, it is of major importance to take into consideration the proper motions of all objects involved in the reduction process. Not to consider such quantities, mainly when they are poorly known to the majority of the objects, may significantly degrade the final results of the reduction. In this paper, we present ...
متن کاملThe Bordeaux meridian observations of asteroids . First determination of the mass of ( 11 ) Parthenope ?
The asteroid observations made with the automatic meridian circle at Bordeaux observatory from 1985 to 1994, and which have recently become available, are presented. The residuals of these observations obtained using the orbital elements published in the “Ephemerides of Minor Planets for 1996” are analysed. An anomaly for the asteroid (17) Thetis was found, indicating a current close encounter ...
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ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 1886
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.18861132408