+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   18455 (1995 DF) Classification: Main-belt Asteroid          SPK-ID: 2018455 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 26 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .147187046241103 4.5105e-08   a 2.235315431613045 8.3245e-09 au q 1.906305955816765 1.0459e-07 au i 4.510655445652567 3.2594e-06 deg node 116.9162527794077 4.9052e-05 deg peri 56.04679150978693 5.0405e-05 deg M 308.2200688537035 1.3384e-05 deg tp 2459572.076189412713 (2021-Dec-23.57618941) 4.5975e-05 TDB period 1220.693554226516 3.34 6.819e-06 1.867e-08 d yr n .294914312239579 1.6474e-09 deg/d Q 2.564324907409326 9.5498e-09 au   Orbit Determination Parameters    # obs. used (total)      1113      data-arc span      15168 days (41.53 yr)      first obs. used      1979-07-24      last obs. used      2021-02-01      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .50362      source      ORB      producer      Otto Matic      solution date      2021-Jul-09 10:08:18   Additional Information  Earth MOID = .917031 au   Jupiter MOID = 2.40343 au   T_jup = 3.620  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 15.4   n/a MPO337414   diameter diameter 2.588 km 0.298 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   geometric albedo albedo 0.219   0.065 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   18455 (1995 DF)          Discovered 1995-Feb-20 by Kobayashi, T. at Oizumi Reference: 20001111/Numbers.arc Last Updated: 2004-04-19 Alternate Designations  1995 DF = 1979 OC3  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Aug-03 14:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin