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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 98 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1048194389669572 4.8605e-08  
a 2.890206276517585 1.2408e-08 au
q 2.587256476114233 1.3865e-07 au
i 19.48541439233107 5.1078e-06 deg
node 311.3337585706271 1.3839e-05 deg
peri 222.5555635222252 2.4849e-05 deg
M 88.18564886054494 2.0852e-05 deg
tp 2458160.870222771082
(2018-Feb-11.37022277)
0.0001039 TDB
period 1794.699271904098
4.91
1.1557e-05
3.164e-08
d
yr
n .2005907093382032 1.2918e-09 deg/d
Q 3.193156076920936 1.3709e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2237  
   data-arc span      42338 days (115.92 yr)  
   first obs. used      1903-12-01  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4297  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 01:53:20  

Additional Information
 Earth MOID = 1.6248 au 
 Jupiter MOID = 1.92198 au 
 T_jup = 3.198 
[ show covariance matrix ]

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 8.42   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 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-January); 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 1.91999916150424 1.91999860685753 1.91999971615107 5.6255961832796 5.54662211723259 2424853.118129141 1.38269606663367 192.910177899429 27.5349897736033 -88.923624149714 3574574.40372433 T 98 CATAB v2.0f-lin.ifort 2019-Nov-07 01:53:30 2019-Nov-07 01:53
1985-Aug-03 09:44 < 00:01 Jupiter 1.98202105893906 1.98202065228232 1.98202146559716 6.00704861997587 5.93548037261711 2446280.905249535 0.449557321262333 146.135288101258 15.5029285976019 85.159255680389 4363761.66919495 T 98 CATAB v2.0f-lin.ifort 2019-Nov-07 01:53:30 2019-Nov-07 01:53
2069-Apr-24 14:12 < 00:01 Jupiter 1.92966787431565 1.92966739594445 1.92966835268729 5.53378512590453 5.45388698147897 2476861.091729048 0.962342005850973 186.460360872686 22.6984947219205 88.1289802680812 3274404.96521562 T 98 CATAB v2.0f-lin.ifort 2019-Nov-07 01:53:30 2019-Nov-07 01:53
2127-Dec-24 05:51 00:02 Jupiter 1.97241566252772 1.97241470584319 1.97241661923657 5.98253823730453 5.91032110720488 2498287.743962567 1.84776840223311 375.594388773639 15.7497740858361 83.2690442222495 3616211.97175523 T 98 CATAB v2.0f-lin.ifort 2019-Nov-07 01:53:30 2019-Nov-07 01:53
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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