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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3713964110139257 3.776e-08  
a 2.730649645816884 7.5844e-09 au
q 1.716496167624046 1.0344e-07 au
i 10.08618207219131 4.4902e-06 deg
node 241.5488518890049 2.1809e-05 deg
peri 49.86045072695691 2.2392e-05 deg
M 217.5462376030879 6.6408e-06 deg
tp 2459652.682022006188
(2022-Mar-14.18202201)
3.2033e-05 TDB
period 1648.152523118737
4.51
6.8667e-06
1.88e-08
d
yr
n .2184263864844168 9.1002e-10 deg/d
Q 3.744803124009723 1.0401e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2404  
   data-arc span      37047 days (101.43 yr)  
   first obs. used      1918-08-03  
   last obs. used      2020-01-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40084  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-28 17:44:06  

Additional Information
 Earth MOID = .720643 au 
 Jupiter MOID = 1.55147 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-August); 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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