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
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 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

[ 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-Nov-24 21:47 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin