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A p p e a r a n c e
F r o m W i k i p e d i a , t h e f r e e e n c y c l o p e d i a
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 .[3] 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.[4] 90 ± 6 km [5]
References
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^ a b c d Delbo', Marco; Tanga, Paolo (February 2009), "Thermal inertia of main belt asteroids smaller than 100 km from IRAS data", Planetary and Space Science , vol. 57, no. 2, pp. 259–265, arXiv :0808.0869 Bibcode :2009P&SS...57..259D , doi :10.1016/j.pss.2008.06.015 .
^ a b Zeigler, K. W.; Florence, W. B. (June 1985), "Photoelectric photometry of asteroids 9 Metis, 18 Melpomene, 60 Echo, 116 Sirona, 230 Athamantis, 694 Ekard, and 1984 KD", Icarus , vol. 62, pp. 512–517, Bibcode :1985Icar...62..512Z , doi :10.1016/0019-1035(85 )90191-5 .
^ Ostro, S. J.; et al. (August 1985), "Mainbelt asteroids - Dual-polarization radar observations", Science , vol. 229, no. 4712, pp. 442–446, Bibcode :1985Sci...229..442O , doi :10.1126/science.229.4712.442 , PMID 17738665 .
^ Timerson, Brad; Durech, J.; Pilcher, F.; et al. (October 2010), "Occultations by 81 Terpsichore and 694 Ekard in 2009 at Different Rotational Phase Angles", The Minor Planet Bulletin , 37 4 ): 140−142, Bibcode :2010MPBu...37..140T .
External links
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R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=694_Ekard&oldid=1195667488 " C a t e g o r i e s : ● M i n o r p l a n e t o b j e c t a r t i c l e s ( n u m b e r e d ) ● B a c k g r o u n d a s t e r o i d s ● D i s c o v e r i e s b y J o e l H a s t i n g s M e t c a l f ● N a m e d m i n o r p l a n e t s ● C P : - t y p e a s t e r o i d s ( T h o l e n ) ● A s t r o n o m i c a l o b j e c t s d i s c o v e r e d i n 1 9 0 9 ● M a i n - b e l t - a s t e r o i d s t u b s H i d d e n c a t e g o r i e s : ● U s e d m y d a t e s f r o m O c t o b e r 2 0 1 9 ● A r t i c l e s w i t h J P L S B D B i d e n t i f i e r s ● A r t i c l e s w i t h M P C i d e n t i f i e r s ● A l l s t u b a r t i c l e s
● T h i s p a g e w a s l a s t e d i t e d o n 1 4 J a n u a r y 2 0 2 4 , a t 2 0 : 3 9 ( U T C ) . ● T e x t i s a v a i l a b l e u n d e r t h e C r e a t i v e C o m m o n s A t t r i b u t i o n - S h a r e A l i k e L i c e n s e 4 . 0 ;
a d d i t i o n a l t e r m s m a y a p p l y . B y u s i n g t h i s s i t e , y o u a g r e e t o t h e T e r m s o f U s e a n d P r i v a c y P o l i c y . W i k i p e d i a ® i s a r e g i s t e r e d t r a d e m a r k o f t h e W i k i m e d i a F o u n d a t i o n , I n c . , a n o n - p r o f i t o r g a n i z a t i o n . ● P r i v a c y p o l i c y ● A b o u t W i k i p e d i a ● D i s c l a i m e r s ● C o n t a c t W i k i p e d i a ● C o d e o f C o n d u c t ● D e v e l o p e r s ● S t a t i s t i c s ● C o o k i e s t a t e m e n t ● M o b i l e v i e w
