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JPL Small-Body Database Browser
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898 Hildegard (A918 PG)
Classification: Main-belt Asteroid          SPK-ID: 2000898
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.


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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3712227711350692 3.7811e-08  
a 2.730945650784069 7.5622e-09 au
q 1.717156438480741 1.0358e-07 au
i 10.0876796731268 4.5577e-06 deg
node 241.558585091815 2.1905e-05 deg
peri 49.81593452414116 2.2518e-05 deg
M 130.2558639001662 6.4778e-06 deg
tp 2458004.065446663474
(2017-Sep-07.56544666)
2.8429e-05 TDB
period 1648.42052228618
4.51
6.8469e-06
1.875e-08
d
yr
n .2183908748604508 9.0712e-10 deg/d
Q 3.744734863087396 1.037e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2321  
   data-arc span      37014 days (101.34 yr)  
   first obs. used      1918-08-03  
   last obs. used      2019-12-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40572  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 20:50:15  

Additional Information
 Earth MOID = .72066 au 
 Jupiter MOID = 1.54944 au 
 T_jup = 3.230 
[ 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 11.7   n/a MPO502161  
diameter diameter 11.693 km 0.153 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 24.855 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Warner, B.D. (1999) Minor Planet Bull. 26, 31-33.]
[Higgins, D.J. (2011) http://www.david-higgins.com/Astronomy/asteroid/lightcurves.htm]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.205   0.041 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
SMASSII spectral type spec_B Sl   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

898 Hildegard (A918 PG)          Discovered 1918-Aug-03 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A918 PG = 1936 PA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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