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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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Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3712227758750204 3.7979e-08  
a 2.730945649787222 7.5834e-09 au
q 1.717156424909398 1.0406e-07 au
i 10.08767971882482 4.6588e-06 deg
node 241.5585860805471 2.2141e-05 deg
peri 49.81593248203603 2.2799e-05 deg
M 130.2558649489803 6.5523e-06 deg
tp 2458004.065442187575
(2017-Sep-07.56544219)
2.8781e-05 TDB
period 1648.420521383623
4.51
6.8661e-06
1.88e-08
d
yr
n .218390874980026 9.0966e-10 deg/d
Q 3.744734874665046 1.0399e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2202  
   data-arc span      36786 days (100.71 yr)  
   first obs. used      1918-08-03  
   last obs. used      2019-04-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40639  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-29 19:15:44  

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 11.6   n/a MPO358634  
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

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