(85989) 1999 JD6
(85989) 1999 JD6 (provisional designation 1999 JD6) is an Aten asteroid, near-Earth object, and potentially hazardous object in the inner Solar System that makes frequent close approaches to Earth and Venus.On the Earth approach in 2015, it was observed by the Goldstone Solar System Radar and found to be a contact binary with the largest axis approximately 2 kilometers wide, and each lobe about 200–300 meters large.[2] Although 1999 JD6 in its current orbit never passes closer than 0.047 AU to Earth, it is listed as a potentially hazardous object because it is large and might pose a threat in the future.The asteroid is well-observed, having been observed over 2,000 times over a length of over 25 years, and was assigned a numeric designation in August 2004.[4] It was imaged by radar, and shown to be a contact binary, about 2 kilometers (1.2 miles) on its long axis.
Goldstone Solar Systemcontact binaryDiscovered byLONEOSOrbital characteristicsUncertainty parameterObservation arcAphelionPerihelionSemi-major axisEccentricityOrbital period (sidereal)Mean motionInclinationLongitude of ascending nodeArgument of perihelionPhysical characteristicsDimensionsSynodic rotation periodGeometric albedoSpectral typeApparent magnitudeprovisional designationAten asteroidnear-Earth objectpotentially hazardous objectGoldstone Solar System RadarContact binary (asteroid)space situational awarenessJPL Small-Body DatabaseSpace probe launchesSpace probesLISA PathfinderSpace observatoriesDSCOVRAstrosatImpact events2015 Kerala meteoroid2015 Thailand bolideWT1190F impactAsteroid close approaches2015 BP513(357439) 2004 BL862015 AZ43(523775) 2014 YB351566 Icarus2015 HM102015 TC252015 TB1452007 VE191(33342) 1998 WT242015 SO2ExoplanetsAldebaran bGliese 436 bGliese 1132 bHD 155233 bHD 164595 bHD 219134HIP 11915 bK2-18bK2-22bKELT-4AbKepler-438bKepler-440bKepler-442bKepler-444Kepler-451bKepler-452bKepler-453bKOI-4878.01LkCa 15 b51 Pegasi bWASP-121bWolf 1061c2015 BP519US 708EGS-zs8-1WISE J224607.57−052635.01SWASP J093010.78+533859.5ASASSN-15lhEGSY8p7Tabby's Star541132 LeleākūhonuaVFTS 352GW150914gravitational wavesGW15122615P/FinlayC/2014 Q2 (Lovejoy)88P/HowellC/2014 Q1 (PanSTARRS)C/2015 G2 (MASTER)C/2013 US10 (Catalina)67P/Churyumov–Gerasimenko10P/TempelRosettacomet 67PMESSENGERNew HorizonsAkatsuki(85990) 1999 JV6 Small Solar System bodiesMinor planetsDesignationGroupsMeanings of namesAsteroidActiveAsteroid beltFamilyJupiter trojanNear-EarthSpectral typesDistant minor planetCentaurNeptune trojanDamocloidTrans-Neptunian objectDetachedKuiper beltOort cloudScattered discCometsExtinctHalley-type