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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 
[ 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 8.6   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

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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