(159857) 2004 LJ1

Asteroid on an eccentric orbit September 2020 yes (159857) 2004 LJ 1 #FFC2E0 LINEAR Lincoln Lab's ETS 10 June 2004 (159857) 2004 LJ 1 ApolloNEOPHA 4 September 2017 (JD 2458000.5) 0 22.29 yr (8,141 days) 3.6072 AU 0.9203 AU 2.2637 AU 0.5935 3.41 yr (1,244 days) 286.61° 0.2894 ms / day 23.140° 235.58° 139.97° 0.0168 AU6.5 LD 2.47 km (calculated)3.070 1.324 km 2.661 0.001 hlightcurve-plots-Warner2.7247 0.0002 h2.76 hlcdb-Torppa-2011 0.130 0.1580.20 (assumed) S (assumed) 15.11 0.9415.4 (159857) 2004 LJ 1 is an asteroid on an eccentric orbit, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 3 kilometers in diameter. The asteroid was discovered on 10 June 2004, by astronomers of the LINEAR program at Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, in the United States. It is one of the largest potentially hazardous asteroids known to exist. Orbit and classification 2004 LJ 1 is a member of the dynamical Apollo group, which are Earth-crossing asteroids. Apollo asteroids are the largest subgroup of near-Earth objects. The body orbits the Sun at a distance of 0.9–3.6 AU once every 3 years and 5 months (1,244 days; semi-major axis of 2.26 AU). Its orbit has an eccentricity of 0.59 and an inclination of 23° with respect to the ecliptic. Its observation arc begins with a precovery from the Digitized Sky Survey taken at the Siding Spring Observatory, Australia, in February 1995, more than 9 years prior to its official discovery observation at Socorro. Close approaches With an absolute magnitude of at least 15.4, 2004 LJ 1 is one of the brightest and presumably largest known potentially hazardous asteroid (see PHA-list). It has an Earth minimum orbital intersection distance of 0.0168 AU km on off 3, which translates into 6.5 lunar distances (LD). On 16 November 2038, this asteroid will make its closest near-Earth encounter at a nominal distance of 0.0198 AU (7.7 LD). It is also classified as a Mars-crosser, crossing the orbit of the Red Planet at 1.66 AU. Physical characteristics 2004 LJ 1 is an assumed stony S-type asteroid. Rotation period Three rotational lightcurves of 2004 LJ 1 have been obtained from photometric observations by Johanna Torppa, Adrián Galád and Brian Warner since 2004.lightcurve-plots-Warnerlcdb-Torppa-2011 Lightcurve analysis gave a consolidated rotation period of 2.7247 hours with a brightness amplitude between 0.15 and 0.59 magnitude (U=3). Diameter and albedo According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, 2004 LJ 1 measures 3.07 kilometers in diameter and its surface has an albedo of 0.13. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 2.47 kilometers, based on an absolute magnitude of 15.4. Numbering and naming This minor planet was numbered by the Minor Planet Center on 30 June 2007. As of 2018, it has not been named. Notes lcdb-Torppa-2011 Torppa (2011) web: Undated observation. Rotation period 2.76 hours with a brightness amplitude of 0.5 mag. Quality Code of 2. Summary figures at the LCDB lightcurve-plots-Warner Lightcurve plot of (159857) 2004 LJ 1 from June to July 2014, by B. D. Warner at the CS3–Palmer Divide Station in California (U82). Quality code of 2. Summary figures at the LCDB and CS3 website. References 30em 2017-05-19 last obs. JPL Small-Body Database Browser: 159857 (2004 LJ1) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2159857 Jet Propulsion Laboratory 18 January 2018 159857 (2004 LJ1) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=159857 18 January 2018 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 24 February 2018 List of the Potentially Hazardous Asteroids (PHAs) Minor Planet Center https://www.minorplanetcenter.net/iau/lists/t_phas.html 18 January 2018 159857 18 January 2018 6 C. R. Nugent A. Mainzer J. Masiero J. Bauer R. M. Cutri T. Grav E. Kramer S. Sonnett R. Stevenson E. L. Wright December 2015 NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015ApJ...814..117N The Astrophysical Journal 814 2 13 2015ApJ...814..117N 10.1088/0004-637X/814/2/117 1509.02522 18 January 2018 A. Galád P. Pravec P. Kusnirák S. Gajdos L. Kornos J. Világi October 2005 Joint Lightcurve Observations of 10 Near-Earth Asteroids from Modra and ONDREJOV http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2005EM&P...97..147G Earth 97 1-2 147–163 2005EM&P...97..147G 10.1007/s11038-006-9066-x 18 January 2018 Warner, Brian D. January 2015 Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 June–October https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015MPBu...42...41W The Minor Planet Bulletin 42 1 41–53 1052-8091 2015MPBu...42...41W 18 January 2018 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 https://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 18 January 2018 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 159857 159857 2004LJ1 2159857 159857 (159857) 2004 LJ 1 159857 159857 159857 20040610