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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
4959 Niinoama (prov. designation 1991 PA1 ) is a dark background asteroid from the outer regions of the asteroid belt . It was discovered by Japanese astronomers Akira Natori and Takeshi Urata at JCPM Yakiimo Station on 15 August 1991.[10] C-type asteroid has a rotation period of 4.7 hours and measures approximately 36 kilometers (22 miles) in diameter. It was named after Taira no Tokiko (1126–1185) of the Imperial House of Japan during the Heian period .
Orbit and classification
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Niinoama is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements . It orbits the Sun in the outer main-belt at a distance of 3.1–3.2 AU eccentricity of 0.01 and an inclination of 9° with respect to the ecliptic .[1] precovery was taken at Palomar Observatory in May 1950, extending the body's observation arc by more than 41 years prior to its official discovery observation at Yakiimo.[10]
Naming
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This minor planet was named after Taira no Tokiko (1126–1185), second wife of military leader Taira no Kiyomori and grandmother of Emperor Antoku after whom 3686 Antoku is named. According to the Tale of the Heike Battle of Dan-no-ura together with the boy-Emperor Antoku in her arms.[2] [11] official naming citation was published by the Minor Planet Center on 10 November 1992 (M.P.C. 21132[12]
Physical characteristics
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Niinoama is an assumed C-type asteroid .[3]
Photometry
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Photometric observations of Niinoama collected during 2008 show a rotation period of ± 0.01magnitude (U=3 [9] ± 0.002U=1+ [13]
Diameter and albedo
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According to the surveys carried out by the Infrared Astronomical Satellite IRAS , the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Niinoama measures between 26.50 and 42.51 kilometers in diameter and its surface has an albedo of 0.079.[5] [7] [8] [4] Collaborative Asteroid Lightcurve Link adopts a diameter of 27.96 kilometers from IRAS, and derives an albedo of 0.1082 based on an absolute magnitude of 10.8.[3]
References
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^ a b c d e f "LCDB Data for (4959) Niinoama" . Asteroid Lightcurve Database (LCDB). Retrieved 16 August 2017 .
^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters . 759 (1 ): 5. arXiv :1209.5794 Bibcode :2012ApJ...759L...8M . doi :10.1088/2041-8205/759/1/L8 .
^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0" . NASA Planetary Data System . 12 Bibcode :2004PDSS...12.....T . Retrieved 22 October 2019 .
^ a b Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal . 791 (2 ): 11. arXiv :1406.6645 Bibcode :2014ApJ...791..121M . doi :10.1088/0004-637X/791/2/121 .
^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey" . Publications of the Astronomical Society of Japan . 63 5 ): 1117–1138. Bibcode :2011PASJ...63.1117U . doi :10.1093/pasj/63.5.1117 online , AcuA catalog p. 153 )
^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal . 741 (2 ): 25. arXiv :1109.6407 Bibcode :2011ApJ...741...90M . doi :10.1088/0004-637X/741/2/90 .
^ a b Carbo, Landy; Kragh, Katherine; Krotz, Jonathan; Meiers, Andrew; Shaffer, Nelson; Torno, Steven; et al. (July 2009). "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory and Oakley Observatory: 2008 September and October" (PDF) . Minor Planet Bulletin . 36 3 ): 91–94. Bibcode :2009MPBu...36...91C . Archived from the original (PDF) on 26 November 2021. Retrieved 19 March 2020 .
^ a b "4959 Niinoama (1991 PA1)" . Minor Planet Center . Retrieved 16 August 2017 .
^ McCullough, Helen Craig (1988). The Tale of the Heike . Stanford University Press. pp. 377–78. ISBN 9780804718035
^ "MPC/MPO/MPS Archive" . Minor Planet Center . Retrieved 16 August 2017 .
^ Behrend, Raoul. "Asteroids and comets rotation curves – (4959) Niinoama" . Geneva Observatory . Retrieved 16 August 2017 .
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=4959_Niinoama&oldid=1195678754 " 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 A k i r a N a t o r i ● D i s c o v e r i e s b y T a k e s h i U r a t a ● N a m e d m i n o r p l a n e t s ● 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 9 1 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
● 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 1 : 2 4 ( 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
