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JPL Small-Body Database Browser
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4418 Fredfranklin (1931 TR1)
Classification: Main-belt Asteroid          SPK-ID: 2004418
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 51 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1541216761456653 2.9414e-08  
a 2.58199471294036 1.0068e-08 au
q 2.184053359982746 7.385e-08 au
i 12.66287265204674 4.8524e-06 deg
node 203.8177154250788 1.451e-05 deg
peri 82.6310011691214 2.255e-05 deg
M 210.4881079276086 1.7092e-05 deg
tp 2459629.868042022280
(2022-Feb-19.36804202)
7.1827e-05 TDB
period 1515.414539856921
4.15
8.8637e-06
2.427e-08
d
yr
n .2375587606767913 1.3895e-09 deg/d
Q 2.979936065897975 1.162e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2425  
   data-arc span      32260 days (88.32 yr)  
   first obs. used      1931-10-09  
   last obs. used      2020-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .42748  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 17:12:53  

Additional Information
 Earth MOID = 1.21187 au 
 Jupiter MOID = 2.24581 au 
 T_jup = 3.373 
[ 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 12.8   n/a MPO365300  
diameter diameter 7.030 km 0.851 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 4.8190 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Warner, B.D. (2005) Minor Planet Bull. 32, 90-92.]
geometric albedo albedo 0.326   0.087 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

4418 Fredfranklin (1931 TR1)          Discovered 1931-Oct-09 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1931 TR1 = 1987 BR3 = 1988 GE 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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