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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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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1266491943868132 1.5063e-08  
a 3.196652328463849 1.1802e-08 au
q 2.791798886329172 5.1475e-08 au
i 4.319592205041128 3.172e-07 deg
node 230.6402331124662 5.3002e-06 deg
peri 41.6619948987271 1.0278e-05 deg
M 311.5458062877567 5.9858e-06 deg
tp 2459677.476762446528
(2022-Apr-07.97676245)
3.4761e-05 TDB
period 2087.572338556763
5.72
1.1561e-05
3.165e-08
d
yr
n .1724491139065796 9.5502e-10 deg/d
Q 3.601505770598525 1.3297e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3538  
   data-arc span      29352 days (80.36 yr)  
   first obs. used      1941-02-15  
   last obs. used      2021-06-27  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42278  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:31:15  

Additional Information
 Earth MOID = 1.77744 au 
 Jupiter MOID = 1.49653 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 11.50   n/a E2021B10  
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. 2020-October); 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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