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20498 (1999 RT1)
Classification: Main-belt Asteroid          SPK-ID: 2020498
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 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1777303044507512 1.8281e-08  
a 2.595884093892307 8.055e-09 au
q 2.134516823565965 4.7078e-08 au
i 15.08680290753925 3.6891e-07 deg
node 351.1820853625304 2.8879e-06 deg
peri 11.45765981848348 3.931e-06 deg
M 25.08441075510206 3.188e-06 deg
tp 2459094.054384925106
(2020-Sep-01.55438492)
1.3359e-05 TDB
period 1527.658823684648
4.18
7.1105e-06
1.947e-08
d
yr
n .2356547119151221 1.0969e-09 deg/d
Q 3.057251364218649 9.4866e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2549  
   data-arc span      9263 days (25.36 yr)  
   first obs. used      1995-10-23  
   last obs. used      2021-03-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37547  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 03:22:30  

Additional Information
 Earth MOID = 1.13127 au 
 Jupiter MOID = 2.40082 au 
 T_jup = 3.347 
[ 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 13.53   n/a E2021B10  
diameter diameter 5.176 km 0.185 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 14.4512 h n/a LCDB (Rev. 2020-October); 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.346   0.077 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

20498 (1999 RT1)          Discovered 1999-Sep-05 by Korlevic, K. at Visnjan
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 RT1 = 1995 UN49 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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