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917 Lyka (A915 RR)
Classification: Main-belt Asteroid          SPK-ID: 2000917
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2003311765594074 3.4916e-08  
a 2.381664862640783 6.5528e-09 au
q 1.904543138537756 8.2135e-08 au
i 5.125300531116788 3.8991e-06 deg
node 343.3932588770076 3.9691e-05 deg
peri 359.9011297372161 4.0667e-05 deg
M 74.6435287326252 8.5012e-06 deg
tp 2458322.138567665266
(2018-Jul-22.63856767)
3.1667e-05 TDB
period 1342.515785922436
3.68
5.5406e-06
1.517e-08
d
yr
n .2681532714735608 1.1067e-09 deg/d
Q 2.858786586743811 7.8655e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2694  
   data-arc span      36494 days (99.92 yr)  
   first obs. used      1919-12-01  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43965  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 01:58:51  

Additional Information
 Earth MOID = .895812 au 
 Jupiter MOID = 2.54296 au 
 T_jup = 3.505 
[ 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 34.878 km 0.184 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 7.867 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Published Reference List:
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2018) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.056   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

917 Lyka (A915 RR)          Discovered 1915-Sep-05 by Neujmin, G. at Simeis
Discovered at Simeis during the First World War while Simeis was not in communication with the Rechen-Institut for long periods of time were given provisional designations containing the Greek letter SIGMA. These are here abbreviated S.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A915 RR = 1950 BS = 1951 JJ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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