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- Title
Observations of Three Stellar Occultations by Comet Hale-Bopp.
- Authors
Betzler, A.; Betzler, L.
- Abstract
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.
- Subjects
COMETS; SMALL solar system bodies; OCCULTATIONS (Astronomy); MICROWAVE reflectometry; OPACITY (Optics)
- Publication
Earth, Moon & Planets, 2017, Vol 120, Issue 1, p1
- ISSN
0167-9295
- Publication type
Article
- DOI
10.1007/s11038-017-9503-z