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Observations of Three Stellar Occultations by Comet Hale–Bopp
Earth, Moon, and Planets ( IF 0.9 ) Pub Date : 2017-03-13 , DOI: 10.1007/s11038-017-9503-z
A. S. Betzler , L. B. S. Betzler

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 $$(6\pm 1) \times 10^{-2}$$(6±1)×10-2 magnitude of occulted star XPM 152-0898466 at a minimum distance of ($$4.3 \pm 0.2)\times 10^{4}$$4.3±0.2)×104 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 $$\tau \sim 3$$τ∼3. The mean geometric albedo p of dust grains is $$(4.5 \pm 0.7) \times 10^{-3}$$(4.5±0.7)×10-3. This low albedo may suggest a difference in the grain population associated to coma and jets.

中文翻译:

Hale-Bopp彗星对三个恒星掩星的观测

1996 年 6 月 12 日 UT,三颗 11-12 R 星等恒星被 Hale-Bopp 彗星掩蔽。Observatorio do Pico dos Dias(巴西)使用 0.6 m 望远镜监测这些恒星穿过彗星大气层的情况。我们检测到彗星尘埃对星光的吸收,这意味着 $$(6\pm 1) \times 10^{-2}$$(6±1)×10-2 等的隐星 XPM 152-0898466距中心冷凝点的最小距离为 ($$4.3 \pm 0.2)\times 10^{4}$4.3±0.2)×104 km。这一结果与其他恒星的星等变化相结合,表明在昏迷中检测到喷流。根据我们对消光的测量,我们推断原子核表面的不透明度为 $$\tau \sim 3$$τ∼3。尘埃颗粒的平均几何反照率 p 为 $$(4.5 \pm 0.7) \times 10^{-3}$$(4.5±0.7)×10-3。
更新日期:2017-03-13
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