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JPL Small-Body Database Browser
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91721 (1999 TQ157)
Classification: Main-belt Asteroid          SPK-ID: 2091721
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1709651289088241 6.8654e-08  
a 3.189099770736143 3.2809e-08 au
q 2.643874917329136 2.1148e-07 au
i 24.51717364629413 8.8313e-06 deg
node 239.1124361626879 1.5564e-05 deg
peri 277.8522422911739 2.8713e-05 deg
M 112.796946497896 2.428e-05 deg
tp 2458348.728406135939
(2018-Aug-18.22840614)
0.00013986 TDB
period 2080.178418619147
5.70
3.2101e-05
8.789e-08
d
yr
n .1730620781264395 2.6707e-09 deg/d
Q 3.734324624143149 3.8418e-08 au
  Orbit Determination Parameters
   # obs. used (total)      963  
   data-arc span      7209 days (19.74 yr)  
   first obs. used      1999-10-09  
   last obs. used      2019-07-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46088  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jan-29 14:04:21  

Additional Information
 Earth MOID = 1.77867 au 
 Jupiter MOID = 1.74693 au 
 T_jup = 3.035 
[ show covariance matrix ]

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 13.9   n/a MPO474795  
diameter diameter 8.985 km 0.302 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.079   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

91721 (1999 TQ157)          Discovered 1999-Oct-09 by LINEAR at Socorro
Reference: 20041028/Numbers.arcLast Updated: 2004-10-29

[ show close-approach data ]
Alternate Designations
 1999 TQ157 = 2002 JF47 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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