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Photometry of Mercury from SOHO/LASCO and Earth. The Phase Function from 2 to 170 deg.
Howard, Russell A.; Mallama, Anthony; Wang, Dennis
CCD observations of Mercury were obtained with the large angle spectrometric coronograph (LASCO) on the solar and heliospheric observatory spacecraft, near superior and inferior solar conjunctions. Whole disk photometry was extracted from the orange and blue filter images and transformed to V magnitudes on the UBV system. The LASCO data were combi…
Sungrazing Comets Discovered with the SOHO/LASCO Coronagraphs 1996-1998
Llebaria, A.; St. Cyr, O. C.; Lamy, P. +2 more
The Kreutz sungrazing family of comets is unique because of its small perihelion distance and because of the large number of known members of this family. SOHO/LASCO coronagraph observations beginning in 1996 have revealed an unprecedented number of Kreutz comets. These new coronagraph observations improve upon earlier observations because of a la…
Dust Grains in the Comae and Tails of Sungrazing Comets: Modeling of Their Mineralogical and Morphological Properties
Kimura, Hiroshi; Mann, Ingrid; Jessberger, Elmar K. +1 more
Observations of sungrazing comets, all of which belong to the Kreutz family, provide the opportunity of studying the properties of dust in the comae and tails of the comets. On the basis of available information on cometary and interplanetary dust as well as observations of dust in the tails of sungrazers, we model dust in sungrazing comets as flu…
Sungrazing Comets: Properties of Nuclei and in Situ Detectability of Cometary Ions at 1 AU
Bochsler, P.; Küppers, M.; Benz, W. +1 more
A one-dimensional sublimation model for cometary nuclei is used to derive size limits for the nuclei of sungrazing comets and to estimate oxygen ion fluxes at 1 AU from their evaporation. Given that none of the ≈300 sungrazers detected by the SOlar and Heliospheric Observatory (SOHO) was observed after disappearing behind the sun, and that small n…