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39431 (5178 T-2)
Classification: Main-belt Asteroid          SPK-ID: 2039431
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05957666170123974 5.0011e-08  
a 3.014879341357469 2.4223e-08 au
q 2.835262894767358 1.4889e-07 au
i 8.713778928785404 6.0281e-06 deg
node 245.5044201986969 3.7636e-05 deg
peri 200.7310289759328 6.6347e-05 deg
M 257.1654576269322 5.418e-05 deg
tp 2459546.685101683732
(2021-Nov-28.18510168)
0.00028877 TDB
period 1912.067988719321
5.23
2.3044e-05
6.309e-08
d
yr
n .1882778238660454 2.2691e-09 deg/d
Q 3.194495787947579 2.5666e-08 au
  Orbit Determination Parameters
   # obs. used (total)      962  
   data-arc span      17052 days (46.69 yr)  
   first obs. used      1973-09-24  
   last obs. used      2020-06-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .541  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 21:01:02  

Additional Information
 Earth MOID = 1.853 au 
 Jupiter MOID = 2.02968 au 
 T_jup = 3.228 
[ 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 14.0   n/a MPO431944  
diameter diameter 5.790 km 0.545 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 9.534 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.145   0.041 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

39431 (5178 T-2)          Discovered 1973-Sep-25 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar
Reference: 20020328/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 5178 T-2 = 1999 RL123 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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