Английская Википедия:694 Ekard
Шаблон:Use dmy dates Шаблон:Infobox planet
694 Ekard is a minor planet orbiting the Sun that was discovered by American astronomer Joel Hastings Metcalf on November 7, 1909. The asteroid's name comes from the reverse spelling of Drake University in Des Moines, Iowa, where Seth Barnes Nicholson and his wife calculated its orbit.
Photometric observations of this asteroid gave a light curve with a period of 5.925 hours and a brightness variation of 0.50 in magnitude.[1] Measurements of the thermal inertia of 694 Ekard give a value of around 100–140 J m−2 K−1 s−1/2, compared to 50 for lunar regolith and 400 for coarse sand in an atmosphere.[2]
13-cm radar observations of this asteroid from the Arecibo Observatory between 1980 and 1985 were used to produce a diameter estimate of 101 km.[3] Four separate stellar occultation events involving this asteroid were observed from multiple sites in 2009. The resulting chords matched a least squares equivalent diameter of Шаблон:Val.[4]
References
External links
Шаблон:Minor planets navigator Шаблон:Small Solar System bodies Шаблон:Authority control
- ↑ Ошибка цитирования Неверный тег
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<ref>; для сносокOstro1985не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокTimerson2010не указан текст
- Английская Википедия
- Background asteroids
- Discoveries by Joel Hastings Metcalf
- Named minor planets
- CP:-type asteroids (Tholen)
- Astronomical objects discovered in 1909
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