1658 Innes

Main-belt asteroid October 2019 yes 1658 Innes #D6D6D6 13 July 1953 J. A. Bruwer Johannesburg Obs. (1658) Innes 1953 NA1940 GB1948 EM1949 QA1953 OF1953 PN1957 OE Robert T. A. Innes(astronomer) main-belt(middle) 4 September 2017 (JD 2458000.5) 0 77.08 yr (28,155 days) 3.0302 AU 2.0866 AU 2.5584 AU 0.1844 4.09 yr (1,495 days) 247.27° 0.2409 ms / day 9.0941° 95.441° 188.76° 13.352 0.140 km13.54 1.17 km14.082 0.042 km14.76 km (calculated) 3.191 0.001 h 0.20 (assumed)0.2241 0.03690.248 0.0190.626 0.318 B–V = 0.960U–B = 0.610Tholen = ASAS 11.27 0.4110.4711.52 1658 Innes, provisional designation 1953 NA, is a rare-type asteroid from the middle region of the asteroid belt, approximately 15 kilometers in diameter. It was named after Robert T. A. Innes. Discovery Innes was discovered on 13 July 1953, by South African astronomer Jacobus Bruwer at Johannesburg Observatory in South Africa. It was the first numbered discovery of astronomer Jacobus Bruwer. In addition, he also discovered the minor planets 1660 Wood, 1794 Finsen, and 3284 Niebuhr. The asteroid 1811 Bruwer was named in his honour by the Dutch, Dutch-American astronomer trio of the Palomar–Leiden survey. Orbit and classification It orbits the Sun in the central main-belt at a distance of 2.1–3.0 AU once every 4 years and 1 month (1,495 days). Its orbit has an eccentricity of 0.18 and an inclination of 9° with respect to the ecliptic. Innes was first identified as 1940 GB at Turku Observatory in 1940, extending the body's observation arc by 13 years prior to its official discovery observation. Physical characteristics In the Tholen taxonomy, Innes has an AS-spectral type, an intermediate form of the rare A-types to the common stony asteroids (also see category listing). Rotation period In May 2005, astronomers Robert Stephens at the Center for Solar System Studies, California, and Lorenzo Franco at Balzaretto Observatory, near Rome, each obtained a rotational lightcurve of Innes. The photometric observations gave an identical rotation period of 3.191 0.001 hours with a brightness variation of 0.22 and 0.25 magnitude, respectively (U=3/3). Diameter and albedo According to the 2014-revised survey result of NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Innes measures 13.35 kilometers in diameter and its surface has an albedo of 0.248, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 14.76 kilometers with an absolute magnitude of 11.52. Naming This minor planet was named for Scottish–South African astronomer Robert T. A. Innes (1861–1933), first director of the discovering Union Observatory from 1903 to 1927 (originally named Transvaal Observatory). He was a skilled observational astronomer, famous for his deliberate search for and discovery of the nearest star, Proxima Centauri, in 1915. He also made important theoretical and computational contributions to celestial mechanics and to the irregular rotation of the Earth. The astronomer is also honored by the lunar crater Innes. The official 1658 naming citation was published by the Minor Planet Center on 1 July 1972 (M.P.C. 3297). References 30em 2017-05-04 last obs. JPL Small-Body Database Browser: 1658 Innes (1953 NA) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001658 Jet Propulsion Laboratory 30 June 2017 JPL Small-Body Database Search Engine: spec. type = A (SMASSII) JPL Solar System Dynamics http://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=all;obj_kind=all;obj_numbered=all;OBJ_field=0;ORB_field=0;c1_group=OBJ;c1_item=Ax;c1_op=%3D;c1_value=A;table_format=HTML;max_rows=50;format_option=comp;c_fields=AcBhBgBjBiBnBsAiAx;.cgifields=format_option;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=ast_orbit_class;.cgifields=table_format;.cgifields=com_orbit_class&query=1&c_sort=AcA 23 December 2016 Dictionary of Minor Planet Names – (1658) Innes Schmadel Lutz D. Springer Berlin Heidelberg 132 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1659 (1658) Innes Dictionary of Minor Planet Names – (1811) Bruwer Schmadel Lutz D. Springer Berlin Heidelberg 145 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1812 (1811) Bruwer 1658 Innes (1953 NA) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1658 23 December 2016 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 6 Joseph R. Masiero T. Grav A. K. Mainzer C. R. Nugent J. M. Bauer R. Stevenson S. Sonnett August 2014 Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014ApJ...791..121M The Astrophysical Journal 791 2 11 2014ApJ...791..121M 10.1088/0004-637X/791/2/121 1406.6645 23 December 2016 1658 23 December 2016 6 A. Mainzer T. Grav J. Masiero E. Hand J. Bauer D. Tholen R. S. McMillan T. Spahr R. M. Cutri E. Wright J. Watkins W. Mo C. Maleszewski November 2011 NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results The Astrophysical Journal 741 2 25 2011ApJ...741...90M 10.1088/0004-637X/741/2/90 1109.6407 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 23 December 2016 Lorenzo Franco Riccardo Papini October 2014 Rotational Period for 1658 Innes, (10597) 1995 TR10, and 30017 Shaundatta http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41..243F The Minor Planet Bulletin 41 4 243–244 1052-8091 2014MPBu...41..243F 23 December 2016 Stephens, Robert D. October 2014 Asteroids Observed from CS3: 2014 April–June http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41..226S The Minor Planet Bulletin 41 4 226–230 1052-8091 2014MPBu...41..226S 23 December 2016 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 23 December 2016 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/20241208174218/http://obswww.unige.ch/~behrend/page_cou.html 8 December 2024 – Observatoire de Genève, Raoul Behrend Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center 1658 1657 Roemera 1658 1659 Punkaharju 001658 Category:Discoveries by Jacobus Albertus Bruwer Category:Named minor planets 001658 19530713