(285263) 1998 QE2

Near-Earth asteroid October 2019 yes (285263) 1998 QE 2 #FFC2E0 (285263) 1998 QE2, Goldstone, May 30, 2013.jpg First radar images of 1998 QE 2 taken at Goldstone on 30 May 2013 LINEAR Lincoln Lab's ETS 19 August 1998 (285263) 1998 QE 2 Amor NEO PHA 4 September 2017 (JD 2458000.5) 0 19.24 yr (7,029 days) 3.8092 AU 1.0377 AU 2.4234 AU 0.5718 3.77 yr (1,378 days) 49.758° 0.2612 ms / day 12.859° 250.14° 345.65° 0.0345 AU (13.4 LD) 3.239 1lcdb-Brozovic 2013b 1.08 km (calculated) 2.7 kmlcdb-Brozovic 2013b 2.75 km 3.2 0.3 km 2.726 0.001 h 4 h (upper limit)lcdb-Brozovic 2013b 4.749 0.001 hlcdb-Pravec-2013 4.751 0.002 h 5.39 0.02 h 0.06 0.20 (assumed) S (assumed) 16.4 16.98 0.02 17.2 17.3 (285263) 1998 QE 2 is a dark asteroid and synchronous binary system, classified as a near-Earth object and potentially hazardous asteroid of the Amor group, approximately 3 kilometers in diameter. It was discovered on 19 August 1998, by astronomers of the LINEAR program at Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, in the United States. Its sub-kilometer minor-planet moon was discovered by radar on 30 May 2013.lcdb-Brozovic 2013b Classification and orbital characteristics As an Amor asteroid, the orbit of 1998 QE 2 is entirely beyond Earth's orbit. The asteroid orbits the Sun at a distance of 1.0–3.8 AU once every 3 years and 9 months (1,378 days; semi-major axis of 2.42 AU). Its orbit has an eccentricity of 0.57 and an inclination of 13° with respect to the ecliptic. The Earth minimum orbit intersection distance with the orbit of the asteroid is 0.035 AU km mi on on, which translates into 13.4 lunar distances. As with many members of the Amor group, this asteroid has an aphelion beyond the orbit of Mars (at 1.66 AU) which also makes it a Mars-crosser. The sooty surface of 1998 QE 2 suggested that it might have previously been a comet that experienced a close encounter with the Sun. However, the Tisserand parameter with respect to Jupiter (TJ=3.2) does not make it obvious whether 1998 QE 2 was ever a comet, since cometary TJ values are typically below 3. Earth approach On 31 May 2013, 1998 QE 2 approached within 0.039 AU km mi on off (15 lunar distances) of Earth at 20:59 UT (4:59 pm EDT). This was the closest approach the asteroid will make to Earth for at least the next two centuries. It is a very strong radar target for Goldstone from May 30 to June 9 and will be one for Arecibo from June 6 to June 12. At its closest approach the asteroid had an apparent magnitude of 11 and therefore required a small telescope to be seen. Integrating the orbital solution shows the asteroid passed 0.08 AU km mi on off from Earth on 8 June 1975 with an apparent magnitude of about 13.9. The next notable close approach will be 27 May 2221, when the asteroid will pass Earth at a distance of 0.038 AU km mi on off. Satellite Goldstone radar observations on 29 May 2013 discovered that 1998 QE 2 is orbited by a minor-planet moon approximately 600–800 meters in diameter.lcdb-Brozovic 2013b In radar images, the satellite appears brighter than 1998 QE 2 because it is rotating significantly more slowly, which compresses the radar return of the satellite along the Doppler axis. This makes the satellite appear narrow and bright compared to 1998 QE 2. The satellite orbits the primary every 32 hours with a maximum separation of 6.4 km us. Once the satellite's orbit is well determined, astronomers and astrophysicists will be able to determine the mass and density of 1998 QE 2. Physical characteristics Surface, albedo and composition The surface of 1998 QE 2 is covered with a sooty substance, making it optically dark with a geometric albedo of 0.06, meaning it absorbs 94% of the light that hits it, which is indicative for a carbonaceous surface of a C-type asteroid. The asteroid is covered with craters and is dark, red, and primitive. Diameter With a diameter between 2.7 and 3.2 kilometers, 1998 QE 2 is one of largest known potentially hazardous asteroid (see PHA-list). Conversely, the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 1.08 kilometers based on an absolute magnitude of 17.2. Gallery Notes lcdb-Brozovic 2013b Brozovic (2013) Companion discovered 2013 May 29 using radar observations. Announced 2013 May 30. Primary: rotation period 4 hours (upper limit); diameter of 2.7 kilometers. Summary figures at the LCDB and NASA news NASA Radar Reveals Asteroid Has Its Own Moon, from 30 May 2013. lcdb-Pravec-2013 Pravec (2013) web: photometry from June 2013. Rotation period 4.749 0.001 hours with a brightness amplitude of 0.19 0.02 mag. Quality Code of (3). Summary figures for at the LCDB and Pravec, P.; Wolf, M.; Sarounova, L. (2013) obtained by the NEO Photometric Program and collaborating projects References 2017-11-16 last obs. JPL Small-Body Database Browser: 285263 (1998 QE2) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2285263 Jet Propulsion Laboratory 20 January 2018 285263 (1998 QE2) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=285263 20 January 2018 List of the Potentially Hazardous Asteroids (PHAs) Minor Planet Center https://www.minorplanetcenter.org/iau/lists/TNOs.html 20 January 2018 Asteroids with Satellites Database – (285263) 1998 QE2 Johnston's Archive 16 November 2014 Johnston, Wm. Robert http://www.johnstonsarchive.net/astro/astmoons/am-285263.html 15 November 2017 May 15, 2013 Asteroid 1998 QE2 to Sail Past Earth Nine Times Larger Than Cruise Ship NASA/JPL Asteroid Radar Research http://www.jpl.nasa.gov/news/news.php?release=2013-163 2013-06-01 last observation: 2013-05-28; arc: 14.7 years; Uncertainty=0 JPL Close-Approach Data: 285263 (1998 QE2) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1998QE2;cad=1#cad 2013-05-30 May 28, 2013 (285263) 1998 QE2 Goldstone Radar Observations Planning NASA/JPL Asteroid Radar Research Dr. Lance A. M. Benner http://echo.jpl.nasa.gov/asteroids/1998QE2/1998QE2_planning.html 2013-05-30 May 30, 2013 NASA Radar Reveals Asteroid Has Its Own Moon NASA/JPL http://www.jpl.nasa.gov/news/news.php?release=2013-182 2013-05-30 1998-08-22 MPEC 1998-Q19 : 1998 QE2 IAU Minor Planet Center https://www.minorplanetcenter.net/mpec/J98/J98Q19.html 2013-05-30 (J98Q02E) May 30, 2013 Say "hi!" to asteroid -- actually, asteroids -- (285263) 1998 QE2 The Planetary Society Emily Lakdawalla http://www.planetary.org/blogs/emily-lakdawalla/2013/05301616-say-hi-to-asteroid-1998qe2.html 2013-05-30 May 24, 2013 Dark, massive asteroid to fly by Earth on May 31 http://phys.org/news/2013-05-dark-massive-asteroid-earth.html Deborah Netburn May 24, 2013 (285263) 1998QE2 Ephemerides for 8 June 1975 NEODyS (Near Earth Objects Dynamic Site) https://newton.spacedys.com/neodys/index.php?pc=1.1.3.1&n=285263&oc=500&y0=1975&m0=6&d0=5&h0=0&mi0=0&y1=1975&m1=6&d1=15&h1=0&mi1=0&ti=1&tiu=days 2013-05-30 2013-06-06 Radar Movies Highlight Asteroid 1998 QE2 and Its Moon http://www.nasa.gov/mission_pages/asteroids/news/asteroid20130606.html NASA 2013-06-08 2013-06-15 Arecibo Radar Sees Asteroid 1998 QE2 and Moon http://www.astrowatch.net/2013/06/arecibo-radar-sees-asteroid-1998-qe2.html Astrowatch 2013-06-15 6 Alessondra Springmann Patrick A. Taylor Michael C. Nolan Ellen S. Howell Ellen Howell Marina Brozovic Lance A. Benner Jon D. Giorgini Michael W. Busch Jean-Luc Margot Clement Lee Joseph S. Jao Dante S. Lauretta November 2014 Radar-Derived Shape Model of Near-Earth Binary Asteroid System (285263) 1998 QE2 http://www.helsinki.fi/acm2014/pdf-material/Day-4/Session-4/Room-2/SPRINGMANN-16EB.pdf American Astronomical Society 46 409.02 2014DPS....4640902S 20 January 2018 285263 20 January 2018 Oey, Julian October 2014 Lightcurve Analysis of Asteroids from Blue Mountains Observatory in 2013 http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41..276O The Minor Planet Bulletin 41 4 276–281 1052-8091 2014MPBu...41..276O 20 January 2018 Hills, Kevin January 2014 Asteroid Lightcurve Analysis at Riverland Dingo Observatory (RDO): 2013 Results http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41....2H The Minor Planet Bulletin 41 1 2–3 1052-8091 2014MPBu...41....2H 20 January 2018 M. Hicks B. Buratt P. Dalba June 2013 BVRI photometry of the Potentially Hazardous Asteroid 285263 (1998 QE2). http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013ATel.5121....1H The Astronomer's Telegram 5121 1 2013ATel.5121....1H 20 January 2018 External links Astronomy Solar System NASA Radar Reveals Asteroid Has Its Own Moon https://web.archive.org/web/20130602212617/http://www.nasa.gov/mission_pages/asteroids/news/asteroid20130530.html 2 June 2013 at NASA Animation of binary asteroid 1998 QE2 derived from radar data Arecibo Radar Sees Asteroid 1998 QE2 and Moon https://web.archive.org/web/20150923175629/http://www.astrowatch.net/2013/06/arecibo-radar-sees-asteroid-1998-qe2.html 23 September 2015 (15 June 2013) Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Asteroids with Satellites, Robert Johnston, johnstonsarchive.net 285263 285263 1998QE2 285263 (285263) 1998 QE 2 285263 285263 285263 285263 285263 20130531 19980819