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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04377053494109056 3.0688e-08  
a 2.426370852460189 6.8421e-09 au
q 2.320167302282537 7.4264e-08 au
i 2.83289538672541 3.2952e-06 deg
node 245.1419312023311 7.8812e-05 deg
peri 241.5061183364065 9.5464e-05 deg
M 69.76168180249219 5.2243e-05 deg
tp 2458732.984692155768
(2019-Sep-06.48469216)
0.00020057 TDB
period 1380.492963122387
3.78
5.8393e-06
1.599e-08
d
yr
n .260776410758194 1.103e-09 deg/d
Q 2.532574402637842 7.1416e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2820  
   data-arc span      33363 days (91.34 yr)  
   first obs. used      1929-02-11  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41068  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:29:31  

Additional Information
 Earth MOID = 1.33695 au 
 Jupiter MOID = 2.48245 au 
 T_jup = 3.507 
[ 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 12.5   n/a MPO502165  
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. 2019-August); 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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