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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2006233193977694 3.4845e-08  
a 2.38123685476962 6.2141e-09 au
q 1.903505212693434 8.184e-08 au
i 5.126366756543586 3.8235e-06 deg
node 343.3840499306172 3.5107e-05 deg
peri 359.8999348586725 3.5889e-05 deg
M 181.9080817202567 7.9513e-06 deg
tp 2459664.463233549513
(2022-Mar-25.96323355)
3.039e-05 TDB
period 1342.153907862152
3.67
5.2537e-06
1.438e-08
d
yr
n .268225572261996 1.0499e-09 deg/d
Q 2.858968496845805 7.4608e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3146  
   data-arc span      36741 days (100.59 yr)  
   first obs. used      1919-12-01  
   last obs. used      2020-07-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41023  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:24:24  

Additional Information
 Earth MOID = .895689 au 
 Jupiter MOID = 2.54622 au 
 T_jup = 3.505 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456606.5 (2013-Nov-10.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2016133372949241 3.5034e-08  
q 1.900806550067197 8.242e-08 au
tp 2456978.055341214397
(2014-Nov-16.55534121)
2.8305e-05 TDB
node 343.4636964443032 3.5038e-05 deg
peri 359.4850516062208 3.581e-05 deg
i 5.134015696272053 3.8269e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3146  
   data-arc span      36741 days (100.59 yr)  
   first obs. used      1919-12-01  
   last obs. used      2020-07-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41023  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:24:24  

Additional Information
 Jupiter MOID = 2.54622 au 
 T_jup = 3.505 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.227410004870257E-15 -2.882744898588055E-15 -3.178733116806234E-14 6.036858885061177E-15 -3.079379081671731E-14 -1.556419138856353E-15
q -2.882744898588055E-15 6.793120560112384E-15 7.603367888862619E-14 -1.42892254489741E-14 7.052079497496312E-14 3.751273087092582E-15
tp -3.178733116806234E-14 7.603367888862619E-14 8.011808390579329E-10 1.952832661589641E-12 2.169991858249504E-10 3.238587008541522E-13
node 6.036858885061177E-15 -1.42892254489741E-14 1.952832661589641E-12 1.227678102661764E-9 -1.22171629086566E-9 -1.149317168820256E-11
peri -3.079379081671731E-14 7.052079497496312E-14 2.169991858249504E-10 -1.22171629086566E-9 1.282360123062549E-9 1.155951727619922E-11
i -1.556419138856353E-15 3.751273087092582E-15 3.238587008541522E-13 -1.149317168820256E-11 1.155951727619922E-11 1.464496657919127E-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 11.6   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. 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

[ 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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