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426 Hippo (A897 RA)
Classification: Main-belt Asteroid          SPK-ID: 2000426
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 102 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1055899344630418 4.8007e-08  
a 2.887168324517977 1.1434e-08 au
q 2.582312410348354 1.3695e-07 au
i 19.50015202436803 4.9493e-06 deg
node 311.3227246361275 1.3378e-05 deg
peri 222.1055181660893 2.3187e-05 deg
M 168.9462030923144 1.9967e-05 deg
tp 2458159.584188387804
(2018-Feb-10.08418839)
9.8585e-05 TDB
period 1791.870350675919
4.91
1.0645e-05
2.914e-08
d
yr
n .2009073925823946 1.1935e-09 deg/d
Q 3.192024238687601 1.2642e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2573  
   data-arc span      42664 days (116.81 yr)  
   first obs. used      1903-12-01  
   last obs. used      2020-09-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40301  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Oct-22 15:26:46  

Additional Information
 Earth MOID = 1.61901 au 
 Jupiter MOID = 1.92076 au 
 T_jup = 3.199 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456039.5 (2012-Apr-22.0) TDB
Reference: JPL 102 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1031419420213386 4.8241e-08  
q 2.591053832738257 1.3716e-07 au
tp 2456363.228877079981
(2013-Mar-11.72887708)
9.9849e-05 TDB
node 311.4420236441645 1.3393e-05 deg
peri 221.7520051463739 2.3507e-05 deg
i 19.47656796392869 4.9466e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2573  
   data-arc span      42664 days (116.81 yr)  
   first obs. used      1903-12-01  
   last obs. used      2020-09-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40301  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Oct-22 15:26:46  

Additional Information
 Jupiter MOID = 1.92076 au 
 T_jup = 3.199 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.327160752875243E-15 -6.598640249350682E-15 -1.540814904698399E-13 3.572216628819035E-15 -2.401563827508571E-14 3.087798572755814E-16
q -6.598640249350682E-15 1.881150685981435E-14 4.728915748640027E-13 -1.024700134142133E-14 6.800111454736043E-14 6.249224827127508E-16
tp -1.540814904698399E-13 4.728915748640027E-13 9.969872215689709E-9 6.700395989119049E-12 1.955531867797089E-9 3.037775683451812E-12
node 3.572216628819035E-15 -1.024700134142133E-14 6.700395989119049E-12 1.793662694215137E-10 -1.670494604365064E-10 1.695552070198263E-11
peri -2.401563827508571E-14 6.800111454736043E-14 1.955531867797089E-9 -1.670494604365064E-10 5.525969261184104E-10 -1.521547301107086E-11
i 3.087798572755814E-16 6.249224827127508E-16 3.037775683451812E-12 1.695552070198263E-11 -1.521547301107086E-11 2.446880844957094E-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 8.6   n/a MPO492754 IRAS observations used: 14
diameter diameter 137.562 km 1.081 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 34.3 h n/a LCDB (Rev. 2019-August); 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:
[Pray, D.P. (2006) Minor Planet Bull. 33, 4-5.]
geometric albedo albedo 0.040   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.710   0.025 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=10.49 deg.
U-B UB 0.345   0.037 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=10.49 deg.
Tholen spectral type spec_T F   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices

426 Hippo (A897 RA)          Discovered 1897-Aug-25 by Charlois, A. at Nice
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1926-Dec-03 14:50 00:01 Jupiter 1.9199992990142 1.91999877283415 1.91999982519426 5.62559712316961 5.54662307620134 2424853.118134010 1.329886969475 190.421855225491 26.2567513545872 -89.230307209341 3668932.71344794 T 102 CATAB v2.0f-lin.ifort 2020-Oct-22 15:27:12 2020-Oct-22 15:27
1985-Aug-03 09:44 < 00:01 Jupiter 1.98202111998046 1.98202072882357 1.9820215111387 6.0070494951121 5.93548126052289 2446280.905265646 0.44287507759197 142.077849085731 14.5862493834183 85.0420327775343 4520105.42258392 T 102 CATAB v2.0f-lin.ifort 2020-Oct-22 15:27:12 2020-Oct-22 15:27
2069-Apr-24 14:12 < 00:01 Jupiter 1.9296680127316 1.92966754692085 1.9296684785428 5.53378613171776 5.45388800780023 2476861.091714781 0.89230909225525 174.020431483944 22.0298213919676 87.849658613175 3447455.82780635 T 102 CATAB v2.0f-lin.ifort 2020-Oct-22 15:27:12 2020-Oct-22 15:27
2127-Dec-24 05:51 00:02 Jupiter 1.97241573683378 1.97241486802338 1.97241660566469 5.98253915410229 5.91032203794205 2498287.743955194 1.73292911597571 347.106170054513 14.8681837748178 83.4174980259103 3794530.67650402 T 102 CATAB v2.0f-lin.ifort 2020-Oct-22 15:27:12 2020-Oct-22 15:27
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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