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91448 (1999 RY21)
Classification: Main-belt Asteroid          SPK-ID: 2091448
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1110523569116076 3.5347e-08  
a 2.575752440215435 1.1575e-08 au
q 2.289709060908686 9.454e-08 au
i 10.53090051888539 5.601e-06 deg
node 8.598069319530373 2.168e-05 deg
peri 109.3463382615378 3.4337e-05 deg
M 253.2508051433973 2.6798e-05 deg
tp 2459448.230535046057
(2021-Aug-21.73053505)
0.00011291 TDB
period 1509.922326188027
4.13
1.0178e-05
2.787e-08
d
yr
n .2384228604055823 1.6072e-09 deg/d
Q 2.861795819522183 1.2861e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1356  
   data-arc span      7734 days (21.17 yr)  
   first obs. used      1999-08-22  
   last obs. used      2020-10-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45879  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 20:39:51  

Additional Information
 Earth MOID = 1.33001 au 
 Jupiter MOID = 2.23046 au 
 T_jup = 3.395 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457110.5 (2015-Mar-29.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .109676201886016 3.5216e-08  
q 2.29440779754265 9.409e-08 au
tp 2456423.472980316507
(2013-May-10.97298032)
0.00011301 TDB
node 8.719564438738747 2.1642e-05 deg
peri 108.6211313330283 3.467e-05 deg
i 10.53808646544197 5.6049e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1356  
   data-arc span      7734 days (21.17 yr)  
   first obs. used      1999-08-22  
   last obs. used      2020-10-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45879  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 20:39:51  

Additional Information
 Jupiter MOID = 2.23046 au 
 T_jup = 3.395 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.240159515109961E-15 -3.2951327367014E-15 -6.136057954106574E-13 2.110684536475277E-15 -1.225266019441246E-13 -1.269106387632511E-15
q -3.2951327367014E-15 8.85302106058873E-15 1.591866765001289E-12 -5.188501087194862E-15 3.270422633134014E-13 4.049478269265679E-15
tp -6.136057954106574E-13 1.591866765001289E-12 1.277047939803801E-8 4.269706269297221E-12 3.071265929710304E-9 1.0093734631545E-11
node 2.110684536475277E-15 -5.188501087194862E-15 4.269706269297221E-12 4.683839505480051E-10 -4.588874490059843E-10 3.814603721079303E-11
peri -1.225266019441246E-13 3.270422633134014E-13 3.071265929710304E-9 -4.588874490059843E-10 1.202020641785009E-9 -3.499440931997141E-11
i -1.269106387632511E-15 4.049478269265679E-15 1.0093734631545E-11 3.814603721079303E-11 -3.499440931997141E-11 3.141477991375028E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.3   n/a MPO493511  
diameter diameter 3.279 km 0.341 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.208   0.039 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91448 (1999 RY21)          Discovered 1999-Sep-07 by LINEAR at Socorro
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

Alternate Designations
 1999 RY21 = 2000 WD145 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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