Observations of Three Stellar Occultations by Comet Hale–Bopp
| Autor: | L. B. S. Betzler, A. S. Betzler |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
education.field_of_study 010504 meteorology & atmospheric sciences Comet dust Comet Extinction (astronomy) Population Astronomy Astronomy and Astrophysics Astrophysics 01 natural sciences Comet Hale–Bopp Stars Space and Planetary Science Geometric albedo 0103 physical sciences Magnitude (astronomy) Earth and Planetary Sciences (miscellaneous) education 010303 astronomy & astrophysics 0105 earth and related environmental sciences |
| Zdroj: | Earth, Moon, and Planets. 120:1-14 |
| ISSN: | 1573-0794 0167-9295 |
| DOI: | 10.1007/s11038-017-9503-z |
| Popis: | On June 12 1996 UT, three 11–12 R magnitude stars were occulted by comet Hale–Bopp. The passage of these stars through the cometary atmosphere was monitored at the Observatorio do Pico dos Dias (Brazil) using a 0.6 m telescope. We detected an absorption of starlight by the comet dust implying in a drop of $$(6\pm 1) \times 10^{-2}$$ magnitude of occulted star XPM 152-0898466 at a minimum distance of ( $$4.3 \pm 0.2)\times 10^{4}$$ km from the central condensation. This result, combined with magnitude variations of other stars, suggests the detection of a jet in the coma. From our measurement of extinction, we infer that the opacity of the nucleus surface was $$\tau \sim 3$$ . The mean geometric albedo p of dust grains is $$(4.5 \pm 0.7) \times 10^{-3}$$ . This low albedo may suggest a difference in the grain population associated to coma and jets. |
| Databáze: | OpenAIRE |
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