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1561 Fricke (1941 CG)
Classification: Main-belt Asteroid          SPK-ID: 2001561
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1267320989729653 3.0801e-08  
a 3.198205239473575 1.4979e-08 au
q 2.792889976528754 9.9283e-08 au
i 4.318805948769679 3.6508e-06 deg
node 230.6562854037323 4.6673e-05 deg
peri 41.43121896358615 4.9484e-05 deg
M 243.5072520331118 1.9235e-05 deg
tp 2459676.511854509401
(2022-Apr-07.01185451)
0.00011359 TDB
period 2089.093715022998
5.72
1.4676e-05
4.018e-08
d
yr
n .1723235283372804 1.2106e-09 deg/d
Q 3.603520502418396 1.6877e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2766  
   data-arc span      28843 days (78.97 yr)  
   first obs. used      1941-02-15  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45759  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:58:17  

Additional Information
 Earth MOID = 1.77863 au 
 Jupiter MOID = 1.49595 au 
 T_jup = 3.178 
[ 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 11.4   n/a MPO337258  
diameter diameter 25.352 km 0.098 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 15.15330 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
geometric albedo albedo 0.063   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1561 Fricke (1941 CG)          Discovered 1941-Feb-15 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1941 CG = 1970 HE = A915 RO 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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