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91472 (1999 RY91)
Classification: Main-belt Asteroid          SPK-ID: 2091472
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1332161385775978 3.7837e-08  
a 3.105329479673843 2.7013e-08 au
q 2.691649477380512 1.2136e-07 au
i 12.44582792994274 6.1443e-06 deg
node 181.7109688983645 2.0815e-05 deg
peri 93.6329564195068 3.2764e-05 deg
M 62.71398235344763 2.3923e-05 deg
tp 2459048.305557703222
(2020-Jul-17.80555770)
0.00013186 TDB
period 1998.756808655272
5.47
2.6081e-05
7.141e-08
d
yr
n .1801119568128959 2.3502e-09 deg/d
Q 3.519009481967173 3.0612e-08 au
  Orbit Determination Parameters
   # obs. used (total)      673  
   data-arc span      8125 days (22.25 yr)  
   first obs. used      1998-05-26  
   last obs. used      2020-08-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56703  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 14:46:02  

Additional Information
 Earth MOID = 1.7128 au 
 Jupiter MOID = 1.73381 au 
 T_jup = 3.171 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456689.5 (2014-Feb-01.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1307078453014988 3.8099e-08  
q 2.699108239418404 1.2145e-07 au
tp 2457053.094719184068
(2015-Jan-30.59471918)
0.00013219 TDB
node 181.8501652526585 2.0847e-05 deg
peri 94.3292494094044 3.3124e-05 deg
i 12.43194109898887 6.14e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      673  
   data-arc span      8125 days (22.25 yr)  
   first obs. used      1998-05-26  
   last obs. used      2020-08-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .56703  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 14:46:02  

Additional Information
 Jupiter MOID = 1.73381 au 
 T_jup = 3.171 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.451532843639091E-15 -4.545042665411354E-15 -1.009563729977314E-14 -4.041606818405533E-15 2.012535091277763E-14 -3.588742671720575E-15
q -4.545042665411354E-15 1.474909080320751E-14 -3.489367532073287E-14 1.118519622219926E-14 -9.241533814021617E-14 1.364356082713728E-14
tp -1.009563729977314E-14 -3.489367532073287E-14 1.74734685609151E-8 -6.03560056620483E-11 3.420322397113792E-9 -5.692291821608277E-12
node -4.041606818405533E-15 1.118519622219926E-14 -6.03560056620483E-11 4.346174969931739E-10 -4.355847669216927E-10 1.341142229231938E-11
peri 2.012535091277763E-14 -9.241533814021617E-14 3.420322397113792E-9 -4.355847669216927E-10 1.097222227648738E-9 -1.418356099748208E-11
i -3.588742671720575E-15 1.364356082713728E-14 -5.692291821608277E-12 1.341142229231938E-11 -1.418356099748208E-11 3.769920861552584E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 14.77   n/a E2021B10  
diameter diameter 4.236 km 0.311 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 51.997 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.142   0.053 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91472 (1999 RY91)          Discovered 1999-Sep-07 by LINEAR at Socorro
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

[ show close-approach data ]
Alternate Designations
 1999 RY91 = 2003 GJ9 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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