+ View the NASA Portal + Near-Earth Object (NEO) Program Search JPL JPL Small-Body Database Browser Search: [ help ]   5751 Zao (1992 AC) Classification: Amor [NEO]          SPK-ID: 2005751 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2456400.5 (2013-Apr-18.0) TDB Reference: JPL 137 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4236773214340729 7.9825e-08   a 2.103135225007679 1.5841e-08 AU q 1.212084526262779 1.7348e-07 AU i 16.0741198959644 7.3899e-06 deg node 121.6988887728569 1.8772e-05 deg peri 25.19137144979184 2.5888e-05 deg M 337.0648890256682 3.2927e-05 deg tp 2456471.473719863689 (2013-Jun-27.97371986) 0.00010269 JED period 1114.035993962417 3.05 1.2587e-05 3.446e-08 d yr n .3231493434243067 3.651e-09 deg/d Q 2.994185923752579 2.2553e-08 AU   Orbit Determination Parameters    # obs. used (total)      1052      data-arc span      8669 days (23.73 yr)      first obs. used      1989-03-10      last obs. used      2012-12-03      planetary ephem.      DE405      SB-pert. ephem.      SB405-CPV-2      condition code      0      fit RMS      .6097      data source      ORB      producer      Otto Matic      solution date      2013-Apr-29 15:43:51   Additional Information  Earth MOID = .24399 AU   T_jup = 3.581  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 14.8 mag n/a PDS3 (MPC 28114)   diameter diameter 2.3 km n/a Delbo et al. (2003). Icarus, v. 166, pp. 116-130   rotation period rot_per 76. h n/a Asteroid Lightcurve DataBase (Rev. 2013-May-01) Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Pravec, P.; Wolf, M.; Sarounova, L. (1995) http://www.asu.cas.cz/~ppravec/neo.htm] [Pravec, P.; Wolf, M.; Sarounova, L. (1998) http://www.asu.cas.cz/~ppravec/neo.htm] geometric albedo albedo 0.36   n/a Delbo et al. (2003). Icarus, v. 166, pp. 116-130   SMASSII spectral type spec_B X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 5751 Zao (1992 AC)          Discovered 1992-Jan-05 by Koishikawa, M. at Ayashi Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1992 AC = 1989 EN1  [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2013-May-26 06:50 UT (server date/time)   Site Manager:   Donald K. Yeomans Webmaster:   Alan B. Chamberlin