Comet Borrelly, entdeckt 1877 Febr. 8
نویسندگان
چکیده
منابع مشابه
Usgs and Dlr Topographic Mapping of Comet Borrelly
In the fall of 2001, NASA’s Deep Space 1 (DS1) probe imaged Comet Borrelly during a flyby encounter. Three of the Borrelly images have geometry suitable to photogrammetrically map the nucleus, which form two stereopairs with an expected precision (EP) of ~410 m and ~670 m each. DS1 team members at the USGS and DLR have independently produced digital elevation models (DEMs) of Borrelly. Automati...
متن کاملFormation of jets in Comet 19P/Borrelly by subsurface geysers
Observations of the inner coma of Comet 19P/Borrelly with the camera on the Deep Space 1 spacecraft revealed several highly collimated dust jets emanating from the nucleus. The observed jets can be produced by acceleration of evolved gas from a subsurface cavity through a narrow orifice to the surface. As long as the cavity is larger than the orifice, the pressure in the cavity will be greater ...
متن کاملThe dust properties of a short period comet: comet P/Borrelly
We have calculated the thermal emission spectrum of the dust of comet P/Borrelly (1994l), a short-period comet (Jupiter family), from 3 μm to 14 μm as well as the 10 μm silicate feature in terms of the comet dust model as porous aggregates of interstellar grains. Compared to comet P/Halley dust, the dust grains of P/Borrelly appear to be relatively more processed (more carbonized), less fluffy,...
متن کاملSpin Axis Direction of Comet 19P/Borrelly Based on Observations from 2000 and 2001
We calculate the direction of the rotational angular momentum vector, M, of comet 19P/Borrelly based on rotational lightcurve data from 2000, groundbased imaging of the coma during the Deep Space 1 encounter, and the basic near-nucleus coma morphology as revealed by the Deep Space 1 spacecraft. For the most likely direction, we derive a family of solutions (with center at RA=221◦, Dec=−7◦) if t...
متن کاملDeep Space 1 encounter with Comet 19P/Borrelly: Ion composition measurements by the PEPE mass spectrometer
[1] We report in situ ion mass spectrometer measurements from the coma of Comet 19P/Borrelly, obtained during the flyby of the Deep Space 1 spacecraft on 22 September 2001. Cometary ions were detected at distances from 5.5 10 km to 2200 km from the nucleus of the comet. The predominant heavy ions observed during the seven minute interval about closest approach to Borrelly included OH (at 57% of...
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ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 1877
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.18770891410