+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   18539 (1996 XX30) Classification: Main-belt Asteroid          SPK-ID: 2018539 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2103641489138837 3.4448e-08   a 2.60099844453765 1.0858e-08 au q 2.053841620426152 8.7609e-08 au i 3.645463211896216 3.831e-06 deg node 241.0218590885652 6.7677e-05 deg peri 185.063584624661 6.8486e-05 deg M 284.5114100280862 1.2835e-05 deg tp 2459521.782727622234 (2021-Nov-03.28272762) 5.5764e-05 TDB period 1532.175683597178 4.19 9.594e-06 2.627e-08 d yr n .2349600009019899 1.4712e-09 deg/d Q 3.148155268649148 1.3142e-08 au   Orbit Determination Parameters    # obs. used (total)      1440      data-arc span      14966 days (40.97 yr)      first obs. used      1979-11-14      last obs. used      2020-11-04      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .51625      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 03:08:18   Additional Information  Earth MOID = 1.06701 au   Jupiter MOID = 2.16945 au   T_jup = 3.380  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.29   n/a E2021B10   diameter diameter 3.626 km 0.986 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.308   0.108 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   18539 (1996 XX30)          Discovered 1996-Dec-14 by Kobayashi, T. at Oizumi Reference: 20001111/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1996 XX30 = 1979 VN3 = 1991 PH17  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-12 20:18 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin