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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 104 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1055899353636416 4.7492e-08  
a 2.887168325464261 1.0819e-08 au
q 2.582312408594537 1.3588e-07 au
i 19.50015292239768 4.6625e-06 deg
node 311.3227236451813 1.3197e-05 deg
peri 222.1055171414691 2.2031e-05 deg
M 168.946204490454 1.9355e-05 deg
tp 2458159.584181015258
(2018-Feb-10.08418102)
9.5083e-05 TDB
period 1791.870351556861
4.91
1.0072e-05
2.758e-08
d
yr
n .200907392483622 1.1293e-09 deg/d
Q 3.192024242333986 1.1961e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2793  
   data-arc span      42704 days (116.92 yr)  
   first obs. used      1903-12-01  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39072  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:29:42  

Additional Information
 Earth MOID = 1.61901 au 
 Jupiter MOID = 1.92076 au 
 T_jup = 3.199 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456350.5 (2013-Feb-27.0) TDB
Reference: JPL 104 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1031894792280558 4.7692e-08  
q 2.590559728773893 1.3615e-07 au
tp 2456363.844875062902
(2013-Mar-12.34487506)
9.5158e-05 TDB
node 311.438849772539 1.3209e-05 deg
peri 221.9119131943038 2.2344e-05 deg
i 19.47853538824586 4.6606e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2793  
   data-arc span      42704 days (116.92 yr)  
   first obs. used      1903-12-01  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39072  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:29:42  

Additional Information
 Jupiter MOID = 1.92076 au 
 T_jup = 3.199 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.274479313471387E-15 -6.477323958020128E-15 4.561632262037072E-14 9.232039584705517E-16 2.590869823805751E-14 3.035778814887486E-15
q -6.477323958020128E-15 1.853746358954143E-14 -1.510285740263126E-14 -9.549675552087762E-16 -5.578532462594651E-14 -6.95069234123943E-15
tp 4.561632262037072E-14 -1.510285740263126E-14 9.055050835425937E-9 3.055019773853787E-12 1.743937808295641E-9 3.393878541313647E-12
node 9.232039584705517E-16 -9.549675552087762E-16 3.055019773853787E-12 1.744868608446867E-10 -1.632908114919511E-10 2.055292271547527E-11
peri 2.590869823805751E-14 -5.578532462594651E-14 1.743937808295641E-9 -1.632908114919511E-10 4.992551441222771E-10 -1.854245754525905E-11
i 3.035778814887486E-15 -6.95069234123943E-15 3.393878541313647E-12 2.055292271547527E-11 -1.854245754525905E-11 2.17208937468875E-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

[ hide close-approach data ]
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 1.91999929970181 1.91999880238157 1.91999979702204 5.62559730011201 5.54662325569157 2424853.118113128 1.28394231846287 187.300020334415 24.9769977223782 -89.5914069932188 3847917.02699474 T 104 CATAB v2.0f-lin.ifort 2020-Nov-13 04:29:50 2020-Nov-13 04:29
1985-Aug-03 09:44 < 00:01 Jupiter 1.98202111317683 1.98202073609404 1.98202149026109 6.00704967687696 5.93548144423226 2446280.905259092 0.436897299759364 136.315286525235 13.512642975091 84.7431990306652 4753146.36114318 T 104 CATAB v2.0f-lin.ifort 2020-Nov-13 04:29:50 2020-Nov-13 04:29
2069-Apr-24 14:12 < 00:01 Jupiter 1.9296680241096 1.92966756976331 1.92966847845633 5.53378630741697 5.45388818654795 2476861.091726211 0.83203179831085 161.266258861369 21.4074660879445 87.4644555911069 3727885.9204401 T 104 CATAB v2.0f-lin.ifort 2020-Nov-13 04:29:50 2020-Nov-13 04:29
2127-Dec-24 05:51 00:02 Jupiter 1.97241570664929 1.97241492060112 1.97241649271496 5.98253927230845 5.91032215648064 2498287.743989387 1.63445232335678 320.985657077591 13.6951638936197 83.5717991012677 4105804.62324327 T 104 CATAB v2.0f-lin.ifort 2020-Nov-13 04:29:50 2020-Nov-13 04:29
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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