1494 Savo

Asteroid October 2019 yes 1494 Savo #D6D6D6 001494-asteroid shape model (1494) Savo.png Shape of Savo modelled from its lightcurve Y. Väisälä Turku Obs. 16 September 1938 (1494) Savo 1938 SJ1925 RL1938 SG 11948 VR1951 SV1953 GD1966 HB1976 HZ Savonia(Finnish region) main-belt(inner)background 4 September 2017 (JD 2458000.5) 0 78.50 yr (28,673 days) 2.4777 AU 1.9019 AU 2.1898 AU 0.1315 3.24 yr (1,184 days) 114.29° 0.3041 ms / day 2.4560° 195.02° 184.32° 7.80 0.22 km7.804 0.219 km9.23 0.43 km10.30 km (calculated) 5.35011 0.00028 hPravec-20065.35020 0.00005 h5.35031 0.00005 h5.35059 0.00001 h5.35059 0.00005 h5.35062 0.00005 h 0.173 0.0170.20 (assumed)0.349 0.061 SMASS SaS 12.08 0.2412.3012.70 1494 Savo, provisional designation 1938 SJ, is a stony background asteroid from the inner region of the asteroid belt, approximately 8 kilometers in diameter. Discovered by astronomer Yrjö Väisälä at the Turku Observatory in 1938, the asteroid was later named after the Finnish region of Savonia. Discovery Savo was discovered on 16 September 1938, by Finnish astronomer Yrjö Väisälä at the Iso-Heikkilä Observatory near Turku, Finland. Two nights later, it was independently discovered by German astronomer Arno Arthur Wachmann at the Bergedorf Observatory in Hamburg. However, the Minor Planet Center only acknowledges the first discoverer. The asteroid was first identified as 1925 RL at the Crimean Simeiz Observatory in September 1929, or nine years before its official discovery observation. Orbit and classification Savo is an asteroid of the main belt's background population that does not belong to any known asteroid family. It orbits the Sun in the inner asteroid belt at a distance of 1.9–2.5 AU once every 3 years and 3 months (1,184 days). Its orbit has an eccentricity of 0.13 and an inclination of 2° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Turku in September 1938. Physical characteristics In the SMASS classification, Savo is an Sa-subtype that transitions from the stony S-type to the A-type asteroids. Rotation period In August 2006, a rotational lightcurve of Savo was obtained from photometric observations by Czech astronomer Petr Pravec at Ondřejov Observatory. Lightcurve analysis gave a well-defined rotation period of 5.35011 hours with a brightness amplitude of 0.52 magnitude (U=3), indicative for a non-spherical shape.Pravec-2006 Follow up observations at the Calvin College Observatory (H62) in 2007 and 2008, gave three nearly identical periods of 5.35020, 5.35031 and 5.35062 hours with an amplitude between 0.44 and 0.63 (U=3/3/3-). Poles The asteroid's lightcurve has also been modeled twice. In 2011, the first modelling used photometric data from the AstDyS database and the Uppsala Asteroid Photometric Catalogue, and found two spin axis of (248.0°, −68.0°) and (83.0°, −66.0°) in ecliptic coordinates (λ, β). A refined modeling in 2016, using the Lowell Photometric Database gave two poles of (50.0°, −65.0°) and (233.0°, −68.0°) in ecliptic coordinates. Also, both studies found a concurring period of 5.35059 hours. Diameter and albedo According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Savo measures between 7.80 and 9.23 kilometers in diameter and its surface has an albedo between 0.173 and 0.349. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 10.30 kilometers based on an absolute magnitude of 12.3. Naming This minor planet was named after Finnish historical province of Savonia. The official 1494 naming citation was published by the Minor Planet Center in January 1956 (M.P.C. 1350). Notes Pravec-2006 Pravec (2006) web: Lightcurve plot of (1494) Savo with a rotation period 5.35011 0.00028 hours with a brightness amplitude of 0.52 mag. Quality Code of 3. Summary figures for (1494) Savo at LCDB and data sheet at Ondrejov Asteroid Photometry Project References 30em 2017-03-29 last obs. JPL Small-Body Database Browser: 1494 Savo (1938 SJ) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001494 Jet Propulsion Laboratory 28 September 2017 Dictionary of Minor Planet Names – (1494) Savo Schmadel Lutz D. Springer Berlin Heidelberg 119 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1495 (1494) Savo 1494 Savo (1938 SJ) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1494 28 September 2017 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) Appendix – Publication Dates of the MPCs Schmadel Lutz D. Springer Berlin Heidelberg 221 978-3-642-01964-7 10.1007/978-3-642-01965-4 Asteroid 1494 Savo – Proper Elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1494 29 October 2019 1494 28 September 2017 6 Joseph R. Masiero A. K. Mainzer T. Grav J. M. Bauer R. M. Cutri C. Nugent M. S. Cabrera November 2012 Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M The Astrophysical Journal Letters 759 1 5 2012ApJ...759L...8M 10.1088/2041-8205/759/1/L8 1209.5794 28 September 2017 6 Fumihiko Usui Daisuke Kuroda Thomas G. Müller Sunao Hasegawa Masateru Ishiguro Takafumi Ootsubo Daisuke Ishihara Hirokazu Kataza Satoshi Takita Shinki Oyabu Munetaka Ueno Hideo Matsuhara Takashi Onaka October 2011 Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey Publications of the Astronomical Society of Japan 63 5 1117–1138 2011PASJ...63.1117U 10.1093/pasj/63.5.1117 (online, AcuA catalog p. 153) 6 Hanus, J. Durech, J. Broz, M. Warner, B. D. Pilcher, F. Stephens, R. Oey, J. Bernasconi, L. Casulli, S. Behrend, R. Polishook, D. Henych, T. Lehký, M. Yoshida, F. Ito, T. June 2011 A study of asteroid pole-latitude distribution based on an extended set of shape models derived by the lightcurve inversion method Astronomy & Astrophysics 530 16 2011A&A...530A.134H 10.1051/0004-6361/201116738 1104.4114 J. Durech J. Hanus D. Oszkiewicz R. Vanco March 2016 Asteroid models from the Lowell photometric database Astronomy and Astrophysics 587 6 2016A&A...587A..48D 10.1051/0004-6361/201527573 1601.02909 6 Melissa J. Dykhuis Lawrence A. Molnar Christopher J. Gates Joshua A. Gonzales Jared J. Huffman Aaron R. Maat Stacy L. Maat Matthew I. Marks Alyssa R. Massey-Plantinga Nathan D. McReynolds Jeremy A. Schut Joshua P. Stoep Andrew J. Stutzman Brandon C. Thomas George W. Vander Tuig Jess W. Vriesema Richard Greenberg March 2016 Efficient spin sense determination of Flora-region asteroids via the epoch method http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016Icar..267..174D Icarus 267 174–203 2016Icar..267..174D 10.1016/j.icarus.2015.12.021 28 September 2017 6 Peter Veres Robert Jedicke Alan Fitzsimmons Larry Denneau Mikael Granvik Bryce Bolin Serge Chastel Richard J. Wainscoat William S. Burgett Kenneth C. Chambers Heather Flewelling Nick Kaiser Eugen A. Magnier Jeff S. Morgan Paul A. Price John L. Tonry Christopher Waters November 2015 Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V Icarus 261 34–47 2015Icar..261...34V 10.1016/j.icarus.2015.08.007 1506.00762 28 September 2017 External links Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Dictionary of Minor Planet Names, Google books Asteroids and comets rotation curves, CdR https://web.archive.org/web/20160729213840/http://obswww.unige.ch/~behrend/page_cou.html 29 July 2016 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1494 1493 Sigrid 1494 1495 Helsinki 001494 Category:Discoveries by Yrjö Väisälä Category:Named minor planets 001494 19380916