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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
Helena (minor planet designation : 101 Helena ) is a large, rocky main-belt asteroid . It was discovered by Canadian-American astronomer J. C. Watson on August 15, 1868,[4] Helen of Troy in Greek mythology .
This object is orbiting the Sun with a period of 4.16 years and an eccentricity of 0.14. Its orbital plane is inclined by 10.2° to the plane of the ecliptic . Radar observations were made of this object on Oct 7 and 19, 2001 from the Arecibo Observatory . Analysis of the data gave an estimated ellipsoidal diameter of 71×63×63 ± 16% km. The mean diameter estimated from IRAS infrared measurements is 66 km, in agreement with the radar findings. It is classified as an S-type asteroid in the Tholen system ,[3] [5] silicate composition. 101 Helena is spinning on its axis with a period of 23 hours.[2]
References
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^ a b DeMeo, Francesca E.; et al. (2011), "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF) , Icarus , 202 (1 ): 160–180, Bibcode :2009Icar..202..160D , doi :10.1016/j.icarus.2009.02.005 , archived from the original (PDF) on 17 March 2014, retrieved 22 March 2013 .
^ "Numbered Minor Planets 1–5000" , Discovery Circumstances , IAU Minor Planet center, retrieved 7 April 2013 .
^ Magri, Christopher; Nolan, Michael C.; Ostro, Steven J.; Giorgini, Jon D. (January 2007), "A radar survey of main-belt asteroids: Arecibo observations of 55 objects during 1999 2003", Icarus , vol. 186, no. 1, pp. 126–151, Bibcode :2007Icar..186..126M , doi :10.1016/j.icarus.2006.08.018 .
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=101_Helena&oldid=1229653185 " 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 a m e s C r a i g W a t s o n ● N a m e d m i n o r p l a n e t s ● S - t y p e a s t e r o i d s ( S M A S S ) ● S - 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 8 6 8 ● H e l e n o f T r o y ● S - t y p e 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 : ● A r t i c l e s w i t h s h o r t d e s c r i p t i o n ● S h o r t d e s c r i p t i o n m a t c h e s W i k i d a t a ● 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 8 J u n e 2 0 2 4 , a t 0 0 : 2 0 ( 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
