103 Hera

Main-belt asteroid October 2019 yes #D6D6D6 103 Hera 000103-asteroid shape model (103) Hera.png 3D convex shape model of 103 Hera James Craig Watsonhttp://ssd.jpl.nasa.gov/sbdb.cgi#top JPL Small-Body Database Browser JPL 2020-10-30 7 September 1868 (103) Hera A868 RA, 1927 CV1950 CM ˈ h ɪər əHera Hera Main belt 31 July 2016 (JD 2457600.5) 2.70109 AU Gm on 2.48175 AU Gm on 2.92042 AU Gm on on 0.0812034 4.44 yr (1621.5 d) 5.41957° 136.186° 188.361° 133.341° 18.09 km/s 91.20 5.6 km 7.917 kg 0.0255 m/s² 0.0482 km/s 23.740 h d on on0.9892 d S 7.66 0.1833 0.025 ~170 K 0.222022 ms / day 144.99 yr (52958 d) 0 1.46898 AU Gm on 2.32392 AU Gm on 3.356 103 Hera is a moderately large main-belt asteroid with an orbital period of 1621.5 days years 2 out off. It was discovered by Canadian-American astronomer James Craig Watson on September 7, 1868, and named after Hera, queen and fifth in power of the Olympian gods in Greek mythology. This is a stony S-type asteroid with a silicate surface composition. Photometric observations made in 2010 at the Organ Mesa Observatory at Las Cruces, New Mexico, and the Hunters Hill Observatory at Ngunnawal, Australian Capital Territory, give a synodic rotation period of 23.740 0.001 hours. The bimodal light curve shows a maximum brightness variation of 0.45 ± 0.03 in magnitude. Measurements made with the IRAS observatory give a diameter of 91.58 4.14 km and a geometric albedo of 0.19 0.02. By comparison, the MIPS photometer on the Spitzer Space Telescope gives a diameter of 88.30 8.51 km and a geometric albedo of 0.20 0.04. When the asteroid was observed occulting a star, the chords showed a diameter of 89.1 1.1 km. References Numbered Minor Planets 1–5000 Discovery Circumstances IAU Minor Planet center https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html 2013-04-07 . Donald K. Yeomans 103 Hera JPL Small-Body Database Browser NASA Jet Propulsion Laboratory https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=103 12 May 2016 . Frederick Pilcher Rotation Period Determination for 103 Hera The Minor Planet Bulletin 38 1 32 January 2011 2011MPBu...38...32P . Erin Lee Ryan Donald R. Mizuno Sachindev S. Shenoy Charles E. Woodward Sean Carey Alberto Noriega-Crespo Kathleen E. Kraemer Stephan D. Price 1 The Kilometer-Sized Main Belt Asteroid Population as Revealed by Spitzer April 2012 1204.1116 cs2 astro-ph.EP Francesca E. DeMeo Richard P. Binzel Stephen M. Slivan Schelte J. Bus 1 An extension of the Bus asteroid taxonomy into the near-infrared Icarus 202 1 160–180 2011 10.1016/j.icarus.2009.02.005 2009Icar..202..160D http://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016%252Fj.icarus.2009.02.005.pdf 2013-03-22 . dead https://web.archive.org/web/20140317200310/https://www.tara.tcd.ie/bitstream/2262/43276/1/PEER_stage2_10.1016/j.icarus.2009.02.005.pdf 2014-03-17 See appendix A. External links 103 102 Miriam 103 104 Klymene 000103 Category:Discoveries by James Craig Watson Category:Named minor planets 000103 000103 18680907