1657 Roemera

Main-belt asteroid October 2019 yes 1657 Roemera #D6D6D6 6 March 1961 P. Wild Zimmerwald Obs. (1657) Roemera 1961 EA1932 AB Elizabeth Roemer(American astronomer) main-belt(inner)Phocaea 4 September 2017 (JD 2458000.5) 0 84.79 yr (30,971 days) 2.9032 AU 1.7946 AU 2.3489 AU 0.2360 3.60 yr (1,315 days) 253.33° 23.372° 105.32° 54.409° 7.665 0.219 km8.04 km (calculated) 4.5 1 h34.0 0.1 h 0.20 (assumed)0.220 0.030 Tholen = SS 12.8412.89 0.16 1657 Roemera, provisional designation 1961 EA, is a stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 6 March 1961, by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland, and later named after American astronomer Elizabeth Roemer. Orbit and classification Roemera is a member of the Phocaea family (701), a large family of stony asteroids with nearly two thousand known members.23 It orbits the Sun in the inner main-belt at a distance of 1.8–2.9 AU once every 3 years and 7 months (1,315 days). Its orbit has an eccentricity of 0.24 and an inclination of 23° with respect to the ecliptic. Roemera was first identified as 1932 AB at Heidelberg Observatory in 1932, extending the body's observation arc by 29 years prior to its official discovery observation at Zimmerwald. Physical characteristics In the Tholen classification, Roemera is a stony S-type asteroid. Lightcurves In May 2008, American astronomer Brian Warner obtained a rotational lightcurve of Roemera from photometric observations at his Palmer Divide Observatory in Colorado. It gave a longer than average rotation period of 34.0 hours with a brightness variation of 0.15 magnitude (U=2). Polish astronomer Wiesław Z. Wiśniewski found a different period solution of 4.5 hours with a low amplitude of 0.09 magnitude in March 1990 (U=2). Diameter and albedo According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Roemera measures 7.66 kilometers in diameter and its surface has an albedo of 0.220, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 8.04 kilometers with an absolute magnitude of 12.89. Naming This minor planet was named by the discoverer in honor American astronomer Elizabeth Roemer (1929–2016), U.S. Naval Observatory, in appreciation of her untiring and successful efforts to advance the knowledge of the motions and physical properties of comets and minor planets. Roemer herself discovered the asteroids 1930 Lucifer and 1983 Bok. The official 1657 naming citation was published by the Minor Planet Center on 1 February 1965 (M.P.C. 2347). References 30em 2016-10-26 last obs. JPL Small-Body Database Browser: 1657 Roemera (1961 EA) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001657 Jet Propulsion Laboratory 30 June 2017 Schmadel Lutz D. Dictionary of Minor Planet Names Springer Berlin Heidelberg 132 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1658 (1657) Roemera 1657 Roemera (1961 EA) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1657 24 December 2016 Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) 2009 https://archive.org/details/dictionaryminorp2008schm limited 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 1657 Roemera – Nesvorny HCM Asteroid Families V3.0 Small Bodies Data Ferret https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1657+Roemera#Asteroid%201657%20RoemeraEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 26 October 2019 https://web.archive.org/web/20201107194934/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1657+Roemera#Asteroid%201657%20RoemeraEAR-A-VARGBDET-5-NESVORNYFAM-V3.0 7 November 2020 dead D. Nesvorný M. Broz V. Carruba December 2014 Identification and Dynamical Properties of Asteroid Families Asteroids IV 297–321 2015aste.book..297N 10.2458/azu_uapress_9780816532131-ch016 1502.01628 9780816532131 1657 24 December 2016 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 24 December 2016 W. Z. Wisniewski T. M. Michalowski A. W. Harris R. S. McMillan March 1995 Photoelectric Observations of 125 Asteroids http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1995LPI....26.1511W Abstracts of the Lunar and Planetary Science Conference 26 1511 1995LPI....26.1511W 24 December 2016 Warner, Brian D. January 2009 Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2008 May - September http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2009MPBu...36....7W The Minor Planet Bulletin 36 1 7–13 1052-8091 2009MPBu...36....7W 24 December 2016 Petr Pravec Alan W. Harris Peter Kusnirák Adrián Galád Kamil Hornoch September 2012 Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012Icar..221..365P Icarus 221 1 365–387 2012Icar..221..365P 10.1016/j.icarus.2012.07.026 24 December 2016 External links Lightcurve plot of 1657 Roemera, Palmer Divide Observatory, B. D. Warner (2008) 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 1657 1656 Suomi 1657 1658 Innes 001657 Category:Discoveries by Paul Wild (Swiss astronomer) Category:Named minor planets 001657 19610306