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74861 (1999 TW90)
Classification: Main-belt Asteroid          SPK-ID: 2074861
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 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1712056375941542 3.4167e-08  
a 2.209633125601784 7.8467e-09 au
q 1.831331477483967 7.6015e-08 au
i 6.875793511406463 4.7923e-06 deg
node 63.28754614239979 3.3415e-05 deg
peri 219.5670564821719 3.7859e-05 deg
M 229.2414720605596 2.1042e-05 deg
tp 2459636.258840631723
(2022-Feb-25.75884063)
7.1535e-05 TDB
period 1199.716646397814
3.28
6.3905e-06
1.75e-08
d
yr
n .3000708551314271 1.5984e-09 deg/d
Q 2.587934773719601 9.1901e-09 au
  Orbit Determination Parameters
   # obs. used (total)      986  
   data-arc span      7797 days (21.35 yr)  
   first obs. used      1999-09-14  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52837  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 06:59:19  

Additional Information
 Earth MOID = .819176 au 
 Jupiter MOID = 2.55068 au 
 T_jup = 3.630 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457097.5 (2015-Mar-16.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1712388168062981 3.4081e-08  
q 1.830815831583624 7.5791e-08 au
tp 2457237.464827690910
(2015-Aug-02.96482769)
6.4516e-05 TDB
node 63.30236985759707 3.3416e-05 deg
peri 219.6476384935161 3.7877e-05 deg
i 6.876450265509568 4.7928e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      986  
   data-arc span      7797 days (21.35 yr)  
   first obs. used      1999-09-14  
   last obs. used      2021-01-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52837  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 06:59:19  

Additional Information
 Jupiter MOID = 2.55068 au 
 T_jup = 3.630 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.161545421094826E-15 -2.573686575456332E-15 -5.454897460912575E-13 1.071093332701484E-15 -1.51788218589824E-13 -2.475212039627502E-16
q -2.573686575456332E-15 5.744341819869118E-15 1.406975555324404E-12 -3.351246943484357E-15 3.879671026269605E-13 8.095091149461454E-16
tp -5.454897460912575E-13 1.406975555324404E-12 4.162311720058454E-9 -7.596067021855964E-12 1.162849780188989E-9 1.996175498365247E-12
node 1.071093332701484E-15 -3.351246943484357E-15 -7.596067021855964E-12 1.116610326516025E-9 -1.11036452327526E-9 -4.285100705548349E-11
peri -1.51788218589824E-13 3.879671026269605E-13 1.162849780188989E-9 -1.11036452327526E-9 1.434692710334413E-9 4.314570616099445E-11
i -2.475212039627502E-16 8.095091149461454E-16 1.996175498365247E-12 -4.285100705548349E-11 4.314570616099445E-11 2.297130408544896E-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 15.7   n/a MPO502609  

74861 (1999 TW90)          Discovered 1999-Oct-02 by LINEAR at Socorro
Reference: 20040415/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1999 TW90 = 2001 DL3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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