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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
1946 Walraven (prov. designation 1931 PH ) is a stony asteroid from the inner regions of the asteroid belt , approximately 10 kilometers in diameter. It was discovered on 8 August 1931, by Dutch astronomer Hendrik van Gent at Leiden Southern Station , annex to the Johannesburg Observatory in South Africa, and named after astronomer Theodore Walraven .[2] [10]
Classification and orbit [ edit ]
Walraven is a stony S-type asteroid that orbits the Sun in the inner main-belt at a distance of 1.8–2.8 AU eccentricity of 0.23 and an inclination of 8° with respect to the ecliptic .[1] observation arc begins one day prior to its official discovery observation.[10]
This minor planet was named in honor of astronomer and pioneer in optical instrumentation and precision photometry, Theodore Fjeda Walraven (1916–2008),[11] Leiden University and for many years resident astronomer at the former Leiden Southern Station near Hartbeespoortdam, South Africa.
Walraven constructed special photometers for the telescopes at the station, including the 5-color photometer for which he developed the Walraven photometric system .[2] Minor Planet Center on 2 April 1988 (M.P.C. 12968[12]
Physical characteristics [ edit ]
Rotation period [ edit ]
Four rotational lightcurves of Walraven were obtained from photometric observation, giving a rotation period between 10.210 and 10.223 hours with a brightness variation of 0.60 to 0.90 magnitude (U=2+/n.a./2/2 [6] [7] [8] [9]
Diameter and albedo [ edit ]
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Walraven measures 9.2 kilometers in diameter and its surface has an albedo of 0.362,[4] [5] Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20, and calculates a diameter of 11.8 kilometers with an absolute magnitude of 12.0.[3]
References [ edit ]
^ a b c Schmadel, Lutz D. (2007). "(1946) Walraven". Dictionary of Minor Planet Names – (1946) Walraven . Springer Berlin Heidelberg . p. 156. doi :10.1007/978-3-540-29925-7_1947 . ISBN 978-3-540-00238-3
^ a b c d e f "LCDB Data for (1946) Walraven" . Asteroid Lightcurve Database (LCDB). Retrieved 9 December 2016 .
^ 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 c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters" . The Astrophysical Journal . 741 (2 ): 20. arXiv :1109.4096 Bibcode :2011ApJ...741...68M . doi :10.1088/0004-637X/741/2/68 . Retrieved 9 December 2016 .
^ a b Aznar Macias, Amadeo; Carreno Garcerain, Alfonso; Arce Masego, Enrique; Brines Rodriguez, Pedro; Lozano de Haro, Juan; Fornas Silva, Alvaro; et al. (July 2016). "Twenty-one Asteroid Lightcurves at Group Observadores de Asteroides (OBAS): Late 2015 to Early 2016" . The Minor Planet Bulletin . 43 3 ): 257–263. Bibcode :2016MPBu...43..257A . ISSN 1052-8091 . Retrieved 9 December 2016 .
^ a b Hanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network" . Astronomy and Astrophysics . 586 : 24. arXiv :1510.07422 Bibcode :2016A&A...586A.108H . doi :10.1051/0004-6361/201527441 . Retrieved 9 December 2016 .
^ a b Folberth, James; Casimir, Serick; Dou, Yueheng; Evans, Davis; Foulkes, Thomas; Haenftling, Miranda; et al. (April 2012). "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2011 July-September" . The Minor Planet Bulletin . 39 2 ): 51–55. Bibcode :2012MPBu...39...51F . ISSN 1052-8091 . Retrieved 9 December 2016 .
^ a b van Gent, H. (May 1933). "Period, light-curve, and ephemeris of the new asteroid with variable brightness 1931 PH" . Bulletin of the Astronomical Institutes of the Netherlands . 7 Bibcode :1933BAN.....7...65V . Retrieved 9 December 2016 .
^ a b "1946 Walraven (1931 PH)" . Minor Planet Center . Retrieved 9 December 2016 .
^ "Theodore Walraven (1916–2008) Dutch pioneer in optical instrumentation and precision photometry" . Leiden Observatory . Archived from the original on 24 September 2015. Retrieved 7 November 2015 .
^ "MPC/MPO/MPS Archive" . Minor Planet Center . Retrieved 9 December 2016 .
External links [ edit ]
R e t r i e v e d f r o m " https://en.wikipedia.org/w/index.php?title=1946_Walraven&oldid=1226205396 " 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 H e n d r i k v a n G e n t ● 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 3 1 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 ● W e b a r c h i v e t e m p l a t e w a y b a c k l i n k s ● 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 2 9 M a y 2 0 2 4 , a t 0 5 : 2 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
