Main-belt asteroid
1520 Imatra (provisional designation1938 UY asteroid from the outer region of theasteroid belt , approximately 54 kilometers in diameter. It was discovered on 22 October 1938, by Finnish astronomerYrjö Väisälä atTurku Observatory in Southwest Finland, who named after the Finnish town ofImatra .[ 2] [ 16]
Imatra is a member of theUrsula family (631 [ 4] family ofC- andX-type asteroids , named after its parent body,375 Ursula .[ 17] : 23 outer main-belt at a distance of 2.8–3.4 AU once every 5 years and 6 months (2,005 days;semi-major axis of 3.11 AU). Its orbit has aneccentricity of 0.10 and aninclination of 15° with respect to theecliptic .[ 1] precoveries and no prior identifications were made. Imatra'sobservation arc begins at Turku, 3 weeks after its official discovery observation.[ 16]
Physical characteristics [ edit ] Imatra is aC-type asteroid in theSMASS taxonomy .[ 1]
In July 2008, American astronomerBrian Warner obtained a rotationallightcurve of Imatra at his Palmer Divide Observatory in Colorado. It gave arotation period of 18.635 hours with a brightness variation of 0.28magnitude (U=3- [ 14] U=2 [ 12] Laurent Bernasconi , Romain Montaigut and Arnaud Leroy gave a period of 18.609 hours with an amplitude of 0.27 magnitude (U=2+ [ 13]
Diameter and albedo [ edit ] According to the surveys carried out by the Infrared Astronomical SatelliteIRAS , the JapaneseAkari satellite, and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission, Imatra measures between 53.42 and 58.63 kilometers in diameter, and its surface has analbedo between 0.039 and 0.062.[ 5] [ 6] [ 7] [ 8] [ 9] [ 10] [ 11] Collaborative Asteroid Lightcurve Link derives an albedo of 0.0428 and a diameter of 53.41 kilometers using anabsolute magnitude of 10.4.[ 3]
Thisminor planet is named for the south-eastern Finnish townImatra , located inSouth Karelia near the Russian border, about halfway betweenSt Petersburg and Finland's capitalHelsinki .[ 2] naming citation was published by theMinor Planet Center on 20 February 1976 (M.P.C. 3929[ 18]
^a b c d e f "JPL Small-Body Database Browser: 1520 Imatra (1938 UY)" (2017-05-02 last obs.).Jet Propulsion Laboratory . Retrieved5 June 2017 .^a b c Schmadel, Lutz D. (2007). "(1520) Imatra".Dictionary of Minor Planet Names .Springer Berlin Heidelberg . p. 121.doi :10.1007/978-3-540-29925-7_1521 .ISBN 978-3-540-00238-3 ^a b c d e f "LCDB Data for (1520) Imatra" . Asteroid Lightcurve Database (LCDB). Retrieved3 January 2017 .^a b "Asteroid 1520 Imatra – Nesvorny HCM Asteroid Families V3.0" .Small Bodies Data Ferret . Retrieved26 October 2019 .^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 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 . Retrieved3 January 2017 . ^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 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 . Retrieved3 January 2017 . ^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 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 . Retrieved3 January 2017 . ^a b de Sanctis, M. C.; Barucci, M. A.; Angeli, C. A.; Fulchignoni, M.; Burchi, R.; Angelini, P. (October 1994)."Photoelectric and CCD observations of 10 asteroids" .Planetary and Space Science .42 (10):859– 864.Bibcode :1994P&SS...42..859D .doi :10.1016/0032-0633(94)90066-3 .ISSN 0032-0633 . Retrieved3 January 2017 . ^a b Behrend, Raoul."Asteroids and comets rotation curves – (1520) Imatra" .Geneva Observatory . Retrieved3 January 2017 . ^a b Warner, Brian D. (January 2009)."Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2008 May - September" .The Minor Planet Bulletin .36 (1):7– 13.Bibcode :2009MPBu...36....7W .ISSN 1052-8091 . Retrieved3 January 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 . Retrieved3 January 2017 . ^a b "1520 Imatra (1938 UY)" .Minor Planet Center . Retrieved3 January 2017 .^ Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families".Asteroids IV . pp. 297– 321.arXiv :1502.01628 Bibcode :2015aste.book..297N .doi :10.2458/azu_uapress_9780816532131-ch016 .ISBN 9780816532131 ^ Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs".Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) 221 .doi :10.1007/978-3-642-01965-4 .ISBN 978-3-642-01964-7
