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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 ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1723135539040274 6.8014e-08  
a 3.186155101505189 3.3029e-08 au
q 2.637137392675382 2.0985e-07 au
i 24.48658477479839 8.2819e-06 deg
node 238.8760688878082 1.5144e-05 deg
peri 278.0698957495902 2.6927e-05 deg
M 181.2937644685771 2.322e-05 deg
tp 2460427.683612440468
(2024-Apr-27.18361244)
0.00013701 TDB
period 2077.297971022916
5.69
3.2301e-05
8.844e-08
d
yr
n .1733020515216344 2.6948e-09 deg/d
Q 3.735172810334995 3.872e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1059  
   data-arc span      7969 days (21.82 yr)  
   first obs. used      1999-10-09  
   last obs. used      2021-08-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43326  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 18:17:49  

Additional Information
 Earth MOID = 1.77217 au 
 Jupiter MOID = 1.74445 au 
 T_jup = 3.036 
[ 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 14.00   n/a MPCxxxxx  
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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