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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 108 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1057465753320773 4.724e-08  
a 2.88681369576549 1.0548e-08 au
q 2.581543033816552 1.3527e-07 au
i 19.50061326146855 4.5084e-06 deg
node 311.3241275954985 1.3189e-05 deg
peri 222.0242309739591 2.1741e-05 deg
M 209.2323383289053 1.9254e-05 deg
tp 2459950.795360294015
(2023-Jan-06.29536029)		 9.7275e-05 TDB
period 1791.540219646655
4.90		 9.8191e-06
2.688e-08		 d
yr
n .2009444142264374 1.1013e-09 deg/d
Q 3.192084357714428 1.1664e-08 au
   Orbit Determination Parameters
   # obs. used (total)      2982  
   data-arc span      42786 days (117.14 yr)  
   first obs. used      1903-12-01  
   last obs. used      2021-01-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .38162  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:46:30  

Additional Information
 Earth MOID = 1.61798 au 
 Jupiter MOID = 1.91997 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 8.63   n/a E2021B10 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. 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:
[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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