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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 
[ 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

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1906-Oct-15 02:13 00:01 Jupiter 1.53060437482432 1.53060388808575 1.53060486157037 2.5728905663291 2.34797446497004 2417498.592531552 1.11731131548708 203.388790891699 26.273786374399 -86.0318452734293 2585614.89160745 T 38 CATAB v2.0f-lin.ifort 2020-Feb-22 15:40:07 2020-Feb-22 15:40
1943-Mar-09 10:05 < 00:01 Jupiter 1.69541037101649 1.69540944429683 1.69541129773672 2.2387277881291 2.00317433698085 2430792.920233172 0.847420928062607 107.064709797358 43.4842430962624 57.3901774146642 1940993.48077736 T 38 CATAB v2.0f-lin.ifort 2020-Feb-22 15:40:07 2020-Feb-22 15:40
2001-May-18 18:37 < 00:01 Jupiter 1.62659058083935 1.62659011531136 1.62659104637381 2.56533606381519 2.35360984033643 2452048.275861745 0.230679143257407 176.293196939499 23.4538239904477 -83.9997427465529 2471927.495643 T 38 CATAB v2.0f-lin.ifort 2020-Feb-22 15:40:07 2020-Feb-22 15:40
2037-Oct-10 10:37 < 00:01 Jupiter 1.57112195188631 1.57112150576237 1.57112239801052 2.31358725603612 2.06747356625418 2465341.942325385 0.336006070328473 75.8444827379529 37.5577156297839 82.3031446235373 2537944.98422661 T 38 CATAB v2.0f-lin.ifort 2020-Feb-22 15:40:07 2020-Feb-22 15:40
2095-Dec-02 20:11 00:01 Jupiter 1.8162476568408 1.81624656946513 1.81624874424249 2.6189963893695 2.43442500527753 2486579.340857630 1.06498328551455 369.501152757685 13.9530745639455 -82.3424079107158 2176485.32215444 T 38 CATAB v2.0f-lin.ifort 2020-Feb-22 15:40:07 2020-Feb-22 15:40
2132-May-20 17:55 00:01 Jupiter 1.5427056425662 1.54270522341794 1.542706061717 2.31758061008764 2.0671429332794 2499897.246825586 1.18166469973736 182.324637047248 36.5494732068263 88.9970566051749 2358399.57227812 T 38 CATAB v2.0f-lin.ifort 2020-Feb-22 15:40:07 2020-Feb-22 15:40
2168-Oct-28 18:35 00:02 Jupiter 1.76931163649005 1.76930988531554 1.76931338767242 1.77489887317296 1.48081263488865 2513207.274065686 1.92071854004246 287.140497017291 51.4702304138737 43.557340545268 1725112.06992495 T 38 CATAB v2.0f-lin.ifort 2020-Feb-22 15:40:07 2020-Feb-22 15:40

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