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JPL Small-Body Database Browser
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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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 17 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05827133756349735 5.2394e-08  
a 3.019943894677358 2.67e-08 au
q 2.84396772456779 1.5398e-07 au
i 8.717420030609212 6.2674e-06 deg
node 245.5378816156173 3.817e-05 deg
peri 199.4572944722448 6.9219e-05 deg
M 183.2236014340381 5.656e-05 deg
tp 2459541.779325509315
(2021-Nov-23.27932551)
0.00030187 TDB
period 1916.888000503709
5.25
2.5422e-05
6.96e-08
d
yr
n .1878043995817185 2.4906e-09 deg/d
Q 3.195920064786925 2.8256e-08 au
  Orbit Determination Parameters
   # obs. used (total)      907  
   data-arc span      16280 days (44.57 yr)  
   first obs. used      1973-09-24  
   last obs. used      2018-04-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54768  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-May-07 04:00:44  

Additional Information
 Earth MOID = 1.86128 au 
 Jupiter MOID = 2.03097 au 
 T_jup = 3.226 
[ 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-January); 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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