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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3713964107081545 3.7728e-08  
a 2.730649645755658 7.5814e-09 au
q 1.716496168420513 1.0335e-07 au
i 10.0861822570719 4.4283e-06 deg
node 241.5488514534861 2.1743e-05 deg
peri 49.86045135043498 2.2301e-05 deg
M 217.5462374953522 6.6129e-06 deg
tp 2459652.682022477489
(2022-Mar-14.18202248)
3.1918e-05 TDB
period 1648.152523063306
4.51
6.8639e-06
1.879e-08
d
yr
n .218426386491763 9.0966e-10 deg/d
Q 3.744803123090803 1.0397e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2477  
   data-arc span      37075 days (101.51 yr)  
   first obs. used      1918-08-03  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39801  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:39:51  

Additional Information
 Earth MOID = .720643 au 
 Jupiter MOID = 1.55147 au 
 T_jup = 3.230 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456612.5 (2013-Nov-16.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3741189885318449 3.7676e-08  
q 1.706224416208084 1.0325e-07 au
tp 2456357.712313617214
(2013-Mar-06.21231362)
2.5106e-05 TDB
node 241.8131426461266 2.1729e-05 deg
peri 49.56321208482317 2.2266e-05 deg
i 10.09903487927932 4.4355e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2477  
   data-arc span      37075 days (101.51 yr)  
   first obs. used      1918-08-03  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .39801  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:39:51  

Additional Information
 Jupiter MOID = 1.55147 au 
 T_jup = 3.230 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.419500859072999E-15 -3.886236519663822E-15 -3.871912684157022E-13 1.010529633898814E-14 -7.214884072733318E-14 -1.702290142264425E-16
q -3.886236519663822E-15 1.066131473145194E-14 1.08426925935836E-12 -3.029566330166167E-14 2.043157265550947E-13 1.444066644742937E-15
tp -3.871912684157022E-13 1.08426925935836E-12 6.303322145423973E-10 -9.462392374417457E-12 1.385868996700967E-10 7.375285840665727E-13
node 1.010529633898814E-14 -3.029566330166167E-14 -9.462392374417457E-12 4.721411335955171E-10 -4.661231396993499E-10 1.865401152979272E-11
peri -7.214884072733318E-14 2.043157265550947E-13 1.385868996700967E-10 -4.661231396993499E-10 4.957968861140346E-10 -1.821637336880062E-11
i -1.702290142264425E-16 1.444066644742937E-15 7.375285840665727E-13 1.865401152979272E-11 -1.821637336880062E-11 1.967332779626221E-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 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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