15977 Pyraechmes

Trojan asteroid July 2018 yes 15977 Pyraechmes #C2FFFF LINEAR Lincoln Lab's ETS 19 June 1998 15977 Pyraechmes 1998 MA 111999 NG 2 Pyraechmes Jupiter trojanTrojanbackground 23 March 2018 (JD 2458200.5) 0 64.37 yr (23,510 d) 5.4295 AU 4.9353 AU 5.1824 AU 0.0477 11.80 yr (4,309 d) 72.300° 0.0835 ms / day 17.344° 209.57° 229.49° 0.0328 AU 2.9070 43.53 0.86 km51.53 3.86 km 250 5 hlightcurve-plots-CS3 0.0460.071 0.008 C (assumed)B–V 0.748 0.033V–R 0.465 0.025V–I 0.906 0.026 10.3010.40 15977 Pyraechmes (provisional designation 1998 MA 11) is a Jupiter trojan from the Trojan camp, approximately 45 km mi off 2 us in diameter. It was discovered on 19 June 1998, by astronomers with the Lincoln Near-Earth Asteroid Research at the Lincoln Lab's ETS near Socorro, New Mexico, in the United States. The suspected tumbler is also a slow rotator with a period of 250 hours. Orbit and classification Pyraechmes is a Jupiter trojan in a 1:1 orbital resonance with Jupiter. It is located in the trailering Trojan camp at the Gas Giant's Lagrangian point, 60° behind its orbit (see Trojans in astronomy). It orbits the Sun at a distance of 4.9–5.4 AU once every 11 years and 10 months (4,309 days; semi-major axis of 5.18 AU). Its orbit has an eccentricity of 0.05 and an inclination of 17° with respect to the ecliptic. The body's observation arc begins with a precovery published by the Digitized Sky Survey and taken at Palomar Observatory in December 1953, more than 44 years prior to its official discovery observation at Socorro. Numbering and naming This minor planet was numbered by the Minor Planet Center on 26 July 2000 (M.P.C. 40994). It was named in April 2025 after Pyraechmes, a leader of the Paeonians who was killed by Patroclus. Physical characteristics Pyraechmes is an assumed C-type asteroid. It has a typical V–I color index of 0.906 (see table below). Rotation period In August 2013, Robert Stephens at the Center for Solar System Studies observed Pyraechmes over three nights. However no meaningful rotational lightcurve could be determined, as the lightcurve's amplitude never varied more than 0.02 magnitude. A period of 11.17 hours was only derived for demonstration purpose (U=2-). In December 2015, Stephens obtained an improved lightcurve with a rotation period of 250 5 hours and a brightness variation of 0.30 magnitude (U=2-). This time the asteroid was observed on 16 nights over a period of one month. The photometric observations also revealed that this object possibly has a non-principal axis rotation, which is commonly known as tumbling.lightcurve-plots-CS3 Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer and the Japanese Akari satellite, Pyraechmes measures 43.53 and 51.53 kilometers in diameter and its surface has an albedo of 0.071 and 0.046, respectively. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 46.30 kilometers based on an absolute magnitude of 10.4. Notes lightcurve-plots-CS3 Lightcurve plots of (15977) 1998 MA11 from Aug 2013 and Dec 2015 by Robert Stephens at the Center for Solar System Studies U81. Quality code is 1/2- (lightcurve rating at CS3). Summary figures at the LCDB and CS3. References 30em 2018-04-20 last obs. JPL Small-Body Database Browser: 15977 (1998 MA11) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2015977 Jet Propulsion Laboratory 1 July 2018 15977 (1998 MA11) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=15977 1 July 2018 List of Jupiter Trojans Minor Planet Center V. Carruba 1 July 2018 https://www.minorplanetcenter.net/iau/lists/JupiterTrojans.html 1 July 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 1 July 2018 T. Grav A. K. Mainzer J. M. Bauer J. R. Masiero C. R. Nugent November 2012 WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy The Astrophysical Journal 759 1 10 2012ApJ...759...49G 10.1088/0004-637X/759/1/49 1209.1549 119101711 (online catalog) Asteroid (15977) 1998 MA11 – Proper Elements AstDyS-2, Asteroids – Dynamic Site https://newton.spacedys.com/astdys/index.php?n=15977&pc=1.1.6 1 July 2018 15977 1 July 2018 Robert D. Stephens Linda M. French Chelsea Davitt Daniel R. Coley April 2014 At the Scaean Gates: Observations Jovian Trojan Asteroids, July- December 2013 The Minor Planet Bulletin 41 2 95–100 1052-8091 2014MPBu...41...95S Robert D. Stephens Daniel R. Coley Linda M. French July 2016 A Report from the L5 Trojan Camp - Lightcurves of Jovian Trojan Asteroids from the Center for Solar System Studies The Minor Planet Bulletin 43 3 265–270 1052-8091 2016MPBu...43..265S 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) O. R. Hainaut H. Boehnhardt S. Protopapa October 2012 Colours of minor bodies in the outer solar system. II. A statistical analysis revisited Astronomy and Astrophysics 546 20 2012A&A...546A.115H 10.1051/0004-6361/201219566 free 1209.1896 54776793 WGSBN Bulletin 5, #5 https://wgsbn-iau.org/files/Bulletins/V005/WGSBNBull_V005_005.pdf WGSBN Bulletin International Astronomical Union 5 5 7 April 2025 7 April 2025 External links Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Discovery Circumstances: Numbered Minor Planets (15001)-(20000) – Minor Planet Center Asteroid (15977) 1998 MA11 https://web.archive.org/web/20180701140200/https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=15977 1 July 2018 at the Small Bodies Data Ferret 15977 2015977 15977 015977 015977 015977 19980619 Pyraechmes