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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .200807831229117 1.8168e-08  
a 2.380841149730409 5.92e-09 au
q 1.902749601952008 4.2327e-08 au
i 5.126770893558269 1.0384e-06 deg
node 343.3852881537125 1.016e-05 deg
peri 359.9198364456061 1.1279e-05 deg
M 235.5388301391727 4.1969e-06 deg
tp 2459664.401135012725
(2022-Mar-25.90113501)
1.6531e-05 TDB
period 1341.81937058221
3.67
5.0047e-06
1.37e-08
d
yr
n .2682924452370944 1.0007e-09 deg/d
Q 2.85893269750881 7.1088e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3269  
   data-arc span      37002 days (101.31 yr)  
   first obs. used      1919-12-01  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40646  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:00:09  

Additional Information
 Earth MOID = .893112 au 
 Jupiter MOID = 2.54678 au 
 T_jup = 3.506 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.68   n/a MPCxxxxx  
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. 2020-October); 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]
[Brincat, S.M.; Galdies, C.; Stone, G.; Grech, W. (2019) Minor Planet Bull. 46, 230-232.]
[Carreno, A.; Arce, E.; Fornas, G.; Mas, V. (2019) Minor Planet Bull. 46, 200-203.]
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

Alternate Designations
 A915 RR = 1950 BS = 1951 JJ 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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