Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ hide orbit diagram ]

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.


[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 99 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1055899303953877 4.8413e-08  
a 2.887168322579344 1.2128e-08 au
q 2.582312420358423 1.3773e-07 au
i 19.50015100638258 5.1042e-06 deg
node 311.3227280444302 1.3767e-05 deg
peri 222.1055182160307 2.4665e-05 deg
M 168.9462009187565 2.0733e-05 deg
tp 2458159.584200053478
(2018-Feb-10.08420005)
0.00010292 TDB
period 1791.870348871151
4.91
1.129e-05
3.091e-08
d
yr
n .2009073927847481 1.2659e-09 deg/d
Q 3.192024224800265 1.3408e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2264  
   data-arc span      42372 days (116.01 yr)  
   first obs. used      1903-12-01  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42491  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:27:09  

Additional Information
 Earth MOID = 1.61901 au 
 Jupiter MOID = 1.92076 au 
 T_jup = 3.199 
[ hide covariance matrix ]
Orbital Elements at Epoch 2455691.5 (2011-May-10.0) TDB
Reference: JPL 99 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1028438688643736 4.8698e-08  
q 2.594860766016348 1.3798e-07 au
tp 2456360.883531186687
(2013-Mar-09.38353119)
0.00010593 TDB
node 311.5318142907468 1.3777e-05 deg
peri 221.0346335332258 2.503e-05 deg
i 19.4702761432308 5.1018e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2264  
   data-arc span      42372 days (116.01 yr)  
   first obs. used      1903-12-01  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42491  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:27:09  

Additional Information
 Jupiter MOID = 1.92076 au 
 T_jup = 3.199 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.37152428328547E-15 -6.699514562298827E-15 -3.536253151246924E-13 3.405988264224416E-15 -7.102704210419481E-14 2.653814472050953E-18
q -6.699514562298827E-15 1.903960998848827E-14 9.292465689493367E-13 -1.118388525203535E-14 1.763358580197362E-13 -1.628146499510826E-15
tp -3.536253151246924E-13 9.292465689493367E-13 1.12201992040011E-8 1.099737955016342E-11 2.238691987218734E-9 5.958873276136017E-12
node 3.405988264224416E-15 -1.118388525203535E-14 1.099737955016342E-11 1.898094293670068E-10 -1.76030041035622E-10 1.310951299899646E-11
peri -7.102704210419481E-14 1.763358580197362E-13 2.238691987218734E-9 -1.76030041035622E-10 6.264986140006881E-10 -1.088177511507194E-11
i 2.653814472050953E-18 -1.628146499510826E-15 5.958873276136017E-12 1.310951299899646E-11 -1.088177511507194E-11 2.602816690072135E-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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-May-30 03:38 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin