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40478 (1999 RT54)
Classification: Main-belt Asteroid          SPK-ID: 2040478
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 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1775366034881598 3.162e-08  
a 2.388331593811229 9.6904e-09 au
q 1.96431531464252 7.5491e-08 au
i .8302666111928277 5.1288e-06 deg
node 188.9561269496824 0.00024312 deg
peri 88.79528938346978 0.00024361 deg
M 155.0964644984196 1.5999e-05 deg
tp 2458019.682411119335
(2017-Sep-23.18241112)
5.8339e-05 TDB
period 1348.156662843658
3.69
8.205e-06
2.246e-08
d
yr
n .2670312805046368 1.6252e-09 deg/d
Q 2.812347872979938 1.1411e-08 au
  Orbit Determination Parameters
   # obs. used (total)      914  
   data-arc span      15070 days (41.26 yr)  
   first obs. used      1977-09-09  
   last obs. used      2018-12-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5111  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-13 02:11:30  

Additional Information
 Earth MOID = .947557 au 
 Jupiter MOID = 2.31017 au 
 T_jup = 3.512 
[ 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 15.7   n/a MPO309467  
diameter diameter 1.686 km 0.377 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.886734 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
geometric albedo albedo 0.226   0.171 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

40478 (1999 RT54)          Discovered 1999-Sep-07 by LINEAR at Socorro
Reference: 20020526/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 RT54 = 1977 RA16 = 1991 GK9 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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