+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   249230 (2008 GZ21) Classification: Mars-crossing Asteroid          SPK-ID: 2249230 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 14 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1657995488360719 3.4097e-08   a 1.771471315219795 7.3864e-09 au q 1.47776217038031 5.8903e-08 au i 20.5549062172652 5.9884e-06 deg node 217.8950693676248 1.0681e-05 deg peri 289.5540818333974 2.1913e-05 deg M 94.29032124974779 2.1908e-05 deg tp 2458774.938887445363 (2019-Oct-18.43888745) 5.1647e-05 TDB period 861.1912595417814 2.36 5.3863e-06 1.475e-08 d yr n .4180256081460315 2.6145e-09 deg/d Q 2.06518046005928 8.6111e-09 au   Orbit Determination Parameters    # obs. used (total)      306      data-arc span      10896 days (29.83 yr)      first obs. used      1990-10-22      last obs. used      2020-08-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50674      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 00:19:22   Additional Information  Earth MOID = .573231 au   Jupiter MOID = 3.04724 au   T_jup = 4.015  [ hide covariance matrix ] Orbital Elements at Epoch 2457761.5 (2017-Jan-08.0) TDB Reference: JPL 14 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1658296728226082 3.4129e-08   q 1.477622563693805 5.8966e-08 au tp 2457913.971370290122 (2017-Jun-09.47137029) 4.8981e-05 TDB node 217.9004281376596 1.0679e-05 deg peri 289.5789525298579 2.1907e-05 deg i 20.55680636504511 5.9889e-06 deg   Orbit Determination Parameters    # obs. used (total)      306      data-arc span      10896 days (29.83 yr)      first obs. used      1990-10-22      last obs. used      2020-08-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50674      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 00:19:22   Additional Information  Jupiter MOID = 3.04724 au   T_jup = 4.015  Orbit Covariance (6×6)   e q tp node peri i e 1.164789222138185E-15 -2.002286322709348E-15 4.039425689674545E-13 -1.419889526682971E-14 1.798945590801977E-13 -4.365998187601941E-15 q -2.002286322709348E-15 3.476949426330368E-15 -5.799708955460038E-13 2.541197227702292E-14 -2.69049795564584E-13 6.194133925689009E-15 tp 4.039425689674545E-13 -5.799708955460038E-13 2.399166746399729E-9 6.055885481306532E-12 9.417596013183095E-10 -3.420349758746403E-11 node -1.419889526682971E-14 2.541197227702292E-14 6.055885481306532E-12 1.140511198002391E-10 -1.044141028593955E-10 1.141409124537839E-11 peri 1.798945590801977E-13 -2.69049795564584E-13 9.417596013183095E-10 -1.044141028593955E-10 4.798996482927467E-10 -2.430172077602165E-11 i -4.365998187601941E-15 6.194133925689009E-15 -3.420349758746403E-11 1.141409124537839E-11 -2.430172077602165E-11 3.586639264091976E-11 [ 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 18.0   n/a MPO454846   249230 (2008 GZ21)          Discovered 2008-Apr-06 by CSS at Catalina Reference: 20100824/Numbers.arc Last Updated: 2010-08-27 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-17 07:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin