1025 Riema

Asteroid October 2019 yes 1025 Riema #D6D6D6 12 August 1923 K. Reinmuth Heidelberg Obs. (1025) Riema 1923 NXA923 QA Johannes Riem(German astronomer) main-belt(inner)Hungaria 4 September 2017 (JD 2458000.5) 0 93.81 yr (34,264 days) 2.0572 AU 1.9009 AU 1.9790 AU 0.0395 2.78 yr (1,017 days) 102.31° 0.3540 ms / day 26.863° 163.39° 349.06° 4.605 0.171 km5.48 km (derived) 3.566 0.005 h3.578 0.002 hlcdb-Warner-2017lightcurveplot-PDS3.580 0.005 h3.581 0.002 hlightcurveplot-PDO3.581 0.001 hlightcurveplot-PDS3.588 0.002 hlightcurveplot-PDS6.557 0.001 h 1.000 0.0000.166 0.0360.40 (assumed) E (Tholen), Xe (SMASS)MXeB–V = 0.714U–B = 0.294V–R = 0.440 0.010 12.3012.512.57 0.2812.92 0.04 1025 Riema, provisional designation 1923 NX, is a bright Hungaria asteroid from the innermost regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 12 August 1923, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany. The asteroid was named after ARI astronomer Johannes Riem. Orbit and classification Riema is a member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. It orbits the Sun at a distance of 1.9–2.1 AU once every 2 years and 9 months (1,017 days). Its orbit has an eccentricity of 0.04 and an inclination of 27° with respect to the ecliptic. The asteroid's observation arc begins at Heidelberg, four nights after its official discovery observation. Physical characteristics In the Tholen classification, Riema is a bright E-type asteroid. In the SMASS taxonomy, it has been classified as a Xe-type, which transitions from the E to the X-types. In addition, the asteroid has also been polarimetrically characterized as a metallic M-type asteroid. Lightcurves In August 2001, a first rotational lightcurve of Riema was obtained from photometric observations by Ukrainian astronomers at Kharkiv (101) and Simeiz (094). Lightcurve analysis gave a rotation period of 6.557 hours with a brightness variation of 0.25 magnitude (U=2). The Ukrainian team also determined the body's poles and axis-ratios. They found a spin axis of (141.0°, 11.0°) and (321.0.0°, −13.0°) in ecliptic coordinates (λ, β), as well as a semi-axis ratio of 3.41 (a/b) and 1.16 (b/c) for the three-axial ellipsoid model (Q=2). Between 2003 and 2017, several additional lightcurves were obtained by American photometrists Robert Stephens and Brian Warner at the Santana Observatory (646), the Palmer Divide Observatory (716) and the Palmer Divide Station (U82), respectively. The constructed lightcurve gave a shorter period for Riema between 3.566 and 3.588 hours with a low amplitude of 0.06 to 0.19 magnitude (U=2/2/2+/2+/3/3).lcdb-Warner-2017lightcurveplot-PDOlightcurveplot-PDS Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Riema measures 4.605 kilometers in diameter and its surface has an outstandingly high albedo of 1.000. The Collaborative Asteroid Lightcurve Link assumes an albedo for E-type Hungaria asteroids of 0.40 – taken from 434 Hungaria, the family's largest member and namesake – and derives a diameter of 5.48 kilometers based on an absolute magnitude of 12.92. Naming This minor planet was named after Johannes Karl Richard Riem (1868–1945), a German astronomer at the Astronomisches Rechen-Institut (ARI) in Berlin. The name was suggested by ARI. The official naming citation was published by Paul Herget in The Names of the Minor Planets in 1955 (H 98). Notes lightcurveplot-PDO Lightcurve plot of 1025 Riema with a period of 3.581 0.002 hours, Palmer Divide Observatory, Colorado, B. D. Warner (2012) lcdb-Warner-2017 Warner (2017) web: rotation period 3.578 0.002 hours with a brightness amplitude of 0.06 mag. Summary figures for (1025) Riema at Collaborative Asteroid Lightcurve Link (CALL) lightcurveplot-PDS Lightcurve plots by B. D. Warner at the Palmer Divide Station in California: (2014), (2015) and (2017) References 30em 2017-06-04 last obs. JPL Small-Body Database Browser: 1025 Riema (1923 NX) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001025 Jet Propulsion Laboratory 6 July 2017 Dictionary of Minor Planet Names – (1025) Riema Schmadel Lutz D. Springer Berlin Heidelberg 88 2007 978-3-540-00238-3 10.1007/978-3-540-29925-7_1026 (1025) Riema 1025 Riema (1923 NX) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=1025 6 July 2017 Spratt, Christopher E. April 1990 The Hungaria group of minor planets http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1990JRASC..84..123S Journal of the Royal Astronomical Society of Canada 84 123–131 0035-872X 1990JRASC..84..123S 6 July 2017 1025 6 July 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 6 July 2017 V. G. Shevchenko Yu. N. Krugly V. G. Chiorny I. N. Belskaya N. M. Gaftonyuk August 2003 Rotation and photometric properties of E-type asteroids https://www.researchgate.net/publication/222944146 Planetary and Space Science 51 9–10 525–532 2003P&SS...51..525S 10.1016/S0032-0633(03)00076-X 6 July 2017 Stephens, Robert D. December 2003 Photometry of 628 Christine, 754 Malabar, 815 Coppelia, and 1025 Riema http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2003MPBu...30...69S The Minor Planet Bulletin 30 4 69–70 1052-8091 2003MPBu...30...69S 6 July 2017 Warner, Brian D. October 2009 Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2009 March–June http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2009MPBu...36..172W The Minor Planet Bulletin 36 4 172–176 1052-8091 2009MPBu...36..172W 6 July 2017 Warner, Brian D. January 2013 Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2012 June - September http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013MPBu...40...26W The Minor Planet Bulletin 40 1 26–29 1052-8091 2013MPBu...40...26W 6 July 2017 Warner, Brian D. July 2014 Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 January–March http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41..144W The Minor Planet Bulletin 41 3 144–155 1052-8091 2014MPBu...41..144W 6 July 2017 Warner, Brian D. January 2016 Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2015 June–September http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016MPBu...43...57W The Minor Planet Bulletin 43 1 57–65 1052-8091 2016MPBu...43...57W 6 July 2017 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 6 July 2017 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 6 July 2017 11104/0217021 free 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 6 July 2017 6 I. N. Belskaya S. Fornasier G. P. Tozzi R. Gil-Hutton A. Cellino K. Antonyuk Yu. N. Krugly A. N. Dovgopol S. Faggi March 2017 Refining the asteroid taxonomy by polarimetric observations http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2017Icar..284...30B Icarus 284 30–42 2017Icar..284...30B 10.1016/j.icarus.2016.11.003 6 July 2017 11336/63617 free R. Gil-Hutton D. Lazzaro P. Benavidez June 2007 Polarimetric observations of Hungaria asteroids https://www.aanda.org/articles/aa/pdf/2007/24/aa7178-07.pdf Astronomy and Astrophysics 468 3 1109–1114 2007A&A...468.1109G 10.1051/0004-6361:20077178 6 July 2017 free 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 1025 1024 Hale 1025 1026 Ingrid 001025 Category:Discoveries by Karl Wilhelm Reinmuth Category:Named minor planets 001025 001025 19230812