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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04364251159120669 1.8788e-08  
a 2.426505066963585 6.4745e-09 au
q 2.320606291452505 4.6059e-08 au
i 2.832771337061168 8.4376e-07 deg
node 245.1411104500965 1.6324e-05 deg
peri 241.5619779378903 3.5209e-05 deg
M 121.8728304381443 3.0956e-05 deg
tp 2458733.115153717533
(2019-Sep-06.61515372)
0.00011904 TDB
period 1380.607507487788
3.78
5.5257e-06
1.513e-08
d
yr
n .2607547750157256 1.0436e-09 deg/d
Q 2.532403842474666 6.7571e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2911  
   data-arc span      33623 days (92.05 yr)  
   first obs. used      1929-02-11  
   last obs. used      2021-03-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40957  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-16 12:26:51  

Additional Information
 Earth MOID = 1.3373 au 
 Jupiter MOID = 2.48151 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 12.53   n/a E2021B10  
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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