Carbonaceous asteroid
1264 Letaba , provisional designation1933 HG , is a carbonaceousasteroid and possibletumbler from thebackground population of the outerasteroid belt , approximately 70 kilometers in diameter. It was discovered on 21 April 1933, by South African astronomerCyril Jackson at theUnion Observatory in Johannesburg.[ 18] Letaba River in eastern South Africa.[ 2]
Orbit and classification [ edit ] Letaba is a non-family asteroid of the main belt'sbackground population .[ 4] outer asteroid belt at a distance of 2.4–3.3 AU once every 4 years and 10 months (1,773 days;semi-major axis of 2.87 AU). Its orbit has aneccentricity of 0.15 and aninclination of 25° with respect to theecliptic .[ 1]
The asteroid was first identified as1930 WC atSimeiz Observatory in November 1930. The body'sobservation arc begins at Johannesburg, the night before its official discovery observation.[ 18]
Physical characteristics [ edit ] In theSMASS classification ,Letaba is a carbonaceousC-type asteroid .[ 1] [ 3]
Several rotationallightcurves ofLetaba have been obtained from photometric observations since 2002.[ 12] [ 13] [ 15] [ 16] rotation period of 32.74 hours with a brightness variation of 0.28magnitude (U=3 [ 14] tumbler due to the lightcurve's inconsistent slope segments (T? ).[ 3] [ 16] Letaba would be the second-largest tumbler just behind the Hildian asteroid1512 Oulu (seeList of tumblers ) .
Diameter and albedo [ edit ] According to the surveys carried out by the Infrared Astronomical SatelliteIRAS , the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer ,Letaba measures between 66.040 and 74.74 kilometers in diameter and its surface has analbedo between 0.0407 and 0.093.[ 5] [ 6] [ 7] [ 8] [ 9] [ 10] [ 11]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.0462 and a diameter of 74.35 kilometers based on anabsolute magnitude of 9.6.[ 3]
Thisminor planet was named after theLetaba River , located in eastern South Africa. The official naming citation was mentioned inThe Names of the Minor Planets Paul Herget in 1955 (H 116 [ 2]
^a b c d e f "JPL Small-Body Database Browser: 1264 Letaba (1933 HG)" (2017-11-02 last obs.).Jet Propulsion Laboratory . Archived fromthe original on 18 September 2020. Retrieved22 November 2017 .^a b c Schmadel, Lutz D. (2007). "(1264) Letaba".Dictionary of Minor Planet Names – (1264) Letaba .Springer Berlin Heidelberg . p. 105.doi :10.1007/978-3-540-29925-7_1265 .ISBN 978-3-540-00238-3 ^a b c d e f g h "LCDB Data for (1264) Letaba" . Asteroid Lightcurve Database (LCDB). Retrieved22 November 2017 .^a b "Asteroid 1264 Letaba – Proper Elements" . AstDyS-2, Asteroids – Dynamic Site. Retrieved29 October 2019 .^a b c 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 .S2CID 119293330 . ^a b c d Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T.; et al. (September 2016)."NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos" .The Astronomical Journal .152 (3): 12.arXiv :1606.08923 Bibcode :2016AJ....152...63N .doi :10.3847/0004-6256/152/3/63 ^a b c d Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015)."NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos" .The Astrophysical Journal .814 (2): 13.arXiv :1509.02522 Bibcode :2015ApJ...814..117N .doi :10.1088/0004-637X/814/2/117 .S2CID 9341381 . Retrieved22 November 2017 . ^a b c d Masiero, Joseph R.; Nugent, C.; Mainzer, A. K.; Wright, E. L.; Bauer, J. M.; Cutri, R. M.; et al. (October 2017)."NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos" .The Astronomical Journal .154 (4): 10.arXiv :1708.09504 Bibcode :2017AJ....154..168M .doi :10.3847/1538-3881/aa89ec ^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 .S2CID 35447010 . ^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 : IRAS-A-FPA-3-RDR-IMPS-V6.0.Bibcode :2004PDSS...12.....T . Retrieved22 October 2019 . ^a b c Behrend, Raoul."Asteroids and comets rotation curves – (1264) Letaba" . Geneva Observatory. Retrieved22 November 2017 . ^a b Stephens, Robert D. (December 2002)."Photometry of 430 Hybris, 798 Ruth, 1264 Letaba, and 3786 Yamada" .The Minor Planet Bulletin .30 (1):1– 2.Bibcode :2003MPBu...30....1S .ISSN 1052-8091 . Retrieved22 November 2017 . ^a b Brines, Pedro; Lozano, Juan; Rodrigo, Onofre; Fornas, A.; Herrero, David; Mas, Vicente; et al. (April 2017)."Sixteen Asteroids Lightcurves at Asteroids Observers (OBAS) - MPPD: 2016 June-November" .The Minor Planet Bulletin .44 (2):145– 149.Bibcode :2017MPBu...44..145B .ISSN 1052-8091 . Retrieved22 November 2017 . ^a b Ferrro, Andrea (April 2017)."Rotational Period of Three Main-belt Asteroids" .The Minor Planet Bulletin .44 (2): 142.Bibcode :2017MPBu...44..142F .ISSN 1052-8091 . Retrieved22 November 2017 . ^a b c Oey, Julian; Williams, Hasen; Groom, Roger (July 2017)."Lightcurve Analysis of Asteroids from BMO and DRO in 2015" .The Minor Planet Bulletin .44 (3):200– 204.Bibcode :2017MPBu...44..200O .ISSN 1052-8091 . Retrieved22 November 2017 . ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015)."Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results" .Icarus .261 :34– 47.arXiv :1506.00762 Bibcode :2015Icar..261...34V .doi :10.1016/j.icarus.2015.08.007 .S2CID 53493339 . Retrieved22 November 2017 . ^a b "1264 Letaba (1933 HG)" .Minor Planet Center . Retrieved22 November 2017 .
