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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 100 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1055899319516775 4.8379e-08  
a 2.887168323059075 1.1966e-08 au
q 2.582312416294228 1.3768e-07 au
i 19.50015151869225 5.0841e-06 deg
node 311.3227257292211 1.3637e-05 deg
peri 222.1055196526187 2.4269e-05 deg
M 168.9462013640885 2.0531e-05 deg
tp 2458159.584197627286
(2018-Feb-10.08419763)
0.00010179 TDB
period 1791.870349317756
4.91
1.114e-05
3.05e-08
d
yr
n .200907392734674 1.249e-09 deg/d
Q 3.192024229823922 1.323e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2307  
   data-arc span      42568 days (116.54 yr)  
   first obs. used      1903-12-01  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42215  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:14:02  

Additional Information
 Earth MOID = 1.61901 au 
 Jupiter MOID = 1.92076 au 
 T_jup = 3.199 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455809.5 (2011-Sep-05.0) TDB
Reference: JPL 100 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1030241060097984 4.8638e-08  
q 2.593184707942444 1.3782e-07 au
tp 2456361.787276729133
(2013-Mar-10.28727673)
0.00010423 TDB
node 311.4808024944626 1.3652e-05 deg
peri 221.3295447576266 2.4604e-05 deg
i 19.46990649493414 5.0812e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2307  
   data-arc span      42568 days (116.54 yr)  
   first obs. used      1903-12-01  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42215  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:14:02  

Additional Information
 Jupiter MOID = 1.92076 au 
 T_jup = 3.199 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.365686809771997E-15 -6.683647424557113E-15 -3.232699739343583E-13 3.985532417211693E-15 -6.456494180860986E-14 -2.395965532228837E-16
q -6.683647424557113E-15 1.899337799943212E-14 8.665697307159194E-13 -1.360896066403236E-14 1.642915874936732E-13 4.407199362660052E-16
tp -3.232699739343583E-13 8.665697307159194E-13 1.086447434149698E-8 1.077051290291641E-11 2.159064724878972E-9 4.382437671294978E-12
node 3.985532417211693E-15 -1.360896066403236E-14 1.077051290291641E-11 1.863866230623679E-10 -1.727506189048628E-10 1.397953146274047E-11
peri -6.456494180860986E-14 1.642915874936732E-13 2.159064724878972E-9 -1.727506189048628E-10 6.053440390756117E-10 -1.207438104864171E-11
i -2.395965532228837E-16 4.407199362660052E-16 4.382437671294978E-12 1.397953146274047E-11 -1.207438104864171E-11 2.581824833908007E-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

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