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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1776733249968672 2.887e-08  
a 2.387487202567156 9.2095e-09 au
q 1.96329441289958 6.9934e-08 au
i .8304295686562667 4.1685e-06 deg
node 188.9434778812138 0.00022906 deg
peri 88.94425271597487 0.00022945 deg
M 315.1949335161934 1.5941e-05 deg
tp 2459368.200605517152
(2021-Jun-02.70060552)
6.0294e-05 TDB
period 1347.441767729424
3.69
7.7965e-06
2.135e-08
d
yr
n .2671729559093574 1.5459e-09 deg/d
Q 2.811679992234731 1.0846e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1022  
   data-arc span      15565 days (42.61 yr)  
   first obs. used      1977-09-09  
   last obs. used      2020-04-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49256  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 08:52:23  

Additional Information
 Earth MOID = .945204 au 
 Jupiter MOID = 2.31136 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 15.72   n/a E2021B10  
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. 2020-October); 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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