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4596 (1981 QB)
Classification: Amor [NEO]          SPK-ID: 2004596
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 108 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5199848898390875 7.2058e-08  
a 2.23877680267683 6.648e-09 au
q 1.074646693562614 1.598e-07 au
i 37.07697634843788 1.0765e-05 deg
node 154.2294698369016 9.9185e-06 deg
peri 248.3911795830847 1.429e-05 deg
M 238.5222714598511 1.182e-05 deg
tp 2459613.365682914231
(2022-Feb-02.86568291)
4.1222e-05 TDB
period 1223.530005337563
3.35
5.4499e-06
1.492e-08
d
yr
n .2942306264901765 1.3106e-09 deg/d
Q 3.402906911791047 1.0105e-08 au
  Orbit Determination Parameters
   # obs. used (total)      448  
   data-arc span      14064 days (38.51 yr)  
   first obs. used      1981-08-28  
   last obs. used      2020-02-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Mar-01 05:07:33  

Additional Information
 Earth MOID = .295046 au 
 Jupiter MOID = 2.88044 au 
 T_jup = 3.218 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457229.5 (2015-Jul-26.0) TDB
Reference: JPL 108 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .5185708033882795 7.1926e-08  
q 1.078407482172539 1.5934e-07 au
tp 2457165.662666711732
(2015-May-23.16266671)
3.6117e-05 TDB
node 154.2900964017148 9.9016e-06 deg
peri 248.3964617786264 1.4325e-05 deg
i 37.09170434074993 1.0766e-05 deg
  Orbit Determination Parameters
   # obs. used (total)      448  
   data-arc span      14064 days (38.51 yr)  
   first obs. used      1981-08-28  
   last obs. used      2020-02-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Mar-01 05:07:33  

Additional Information
 Jupiter MOID = 2.88044 au 
 T_jup = 3.218 
Orbit Covariance (6×6)
  e q tp node peri i
e 5.173389036818016E-15 -1.145909261306321E-14 1.074318375113556E-12 -3.970814234411886E-14 -8.923828358366316E-14 -3.602451125158077E-14
q -1.145909261306321E-14 2.538993657637553E-14 -2.361920917249265E-12 8.675680512265016E-14 2.036670342352844E-13 7.758088877537332E-14
tp 1.074318375113556E-12 -2.361920917249265E-12 1.30443175594378E-9 -4.785472113598582E-11 3.379260883709076E-10 -6.396014010513784E-11
node -3.970814234411886E-14 8.675680512265016E-14 -4.785472113598582E-11 9.80424683183799E-11 -8.825003373509054E-11 4.795038001803029E-12
peri -8.923828358366316E-14 2.036670342352844E-13 3.379260883709076E-10 -8.825003373509054E-11 2.051916746234376E-10 -1.900130472202549E-11
i -3.602451125158077E-14 7.758088877537332E-14 -6.396014010513784E-11 4.795038001803029E-12 -1.900130472202549E-11 1.159085399489205E-10

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 16.33   n/a E2021B10  
rotation period rot_per 2.49101 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]

4596 (1981 QB)          Discovered 1981-Aug-28 by Kowal, C. T. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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