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1311 Knopfia (1933 FF1)
Classification: Main-belt Asteroid          SPK-ID: 2001311
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04319199913224181 1.6666e-08  
a 2.427748395121752 5.9115e-09 au
q 2.322889088546352 3.9512e-08 au
i 2.831456417939073 8.3434e-07 deg
node 245.120125105625 1.6295e-05 deg
peri 241.9808073444191 2.8983e-05 deg
M 172.5592285516199 2.4519e-05 deg
tp 2458734.223065046679
(2019-Sep-07.72306505)
9.3795e-05 TDB
period 1381.66876720751
3.78
5.0465e-06
1.382e-08
d
yr
n .2605544892844295 9.5166e-10 deg/d
Q 2.532607701697152 6.1668e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3232  
   data-arc span      33782 days (92.49 yr)  
   first obs. used      1929-02-11  
   last obs. used      2021-08-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39888  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 07:32:37  

Additional Information
 Earth MOID = 1.34018 au 
 Jupiter MOID = 2.47969 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 12.52   n/a MPO614063  
diameter diameter 9.939 km 0.072 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 19.296 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Black, S.; Linville, D.; Michalik, D.; Wolf, M.; Ditteon, R. (2016) Minor Planet Bull. 43, 287-289.]
geometric albedo albedo 0.099   0.020 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

1311 Knopfia (1933 FF1)          Discovered 1933-Mar-24 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1933 FF1 = 1929 CG1 = 1972 RP2 = 1976 SD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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