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49915 (1999 XU171)
Classification: Main-belt Asteroid          SPK-ID: 2049915
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1247730004517484 3.0645e-08  
a 2.263198751800414 7.0356e-09 au
q 1.980812652919624 7.0935e-08 au
i 4.606078364708327 4.1976e-06 deg
node 322.8782166090816 4.8385e-05 deg
peri 108.4669478185447 5.239e-05 deg
M 79.96470113356048 1.9217e-05 deg
tp 2458924.265265579549
(2020-Mar-15.76526558)
6.627e-05 TDB
period 1243.605027989361
3.40
5.799e-06
1.588e-08
d
yr
n .2894809782025743 1.3499e-09 deg/d
Q 2.545584850681203 7.9134e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1133  
   data-arc span      14975 days (41.00 yr)  
   first obs. used      1980-03-23  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49527  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 06:02:54  

Additional Information
 Earth MOID = 1.00064 au 
 Jupiter MOID = 2.68928 au 
 T_jup = 3.604 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457077.5 (2015-Feb-24.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1242535971523172 3.0618e-08  
q 1.981914903197863 7.0804e-08 au
tp 2457678.871914255138
(2016-Oct-17.37191425)
6.6569e-05 TDB
node 322.9973486564247 4.8368e-05 deg
peri 107.9674043282791 5.2426e-05 deg
i 4.606672408646014 4.1996e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1133  
   data-arc span      14975 days (41.00 yr)  
   first obs. used      1980-03-23  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49527  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 06:02:54  

Additional Information
 Jupiter MOID = 2.68928 au 
 T_jup = 3.604 
Orbit Covariance (6×6)
  e q tp node peri i
e 9.374815300676254E-16 -2.160115908006918E-15 -4.108435162309016E-13 3.504009536611527E-15 -1.102074364683096E-13 -1.443654706488224E-15
q -2.160115908006918E-15 5.013136094000715E-15 9.323040476852608E-13 -8.013471716159178E-15 2.443174601357951E-13 3.471033646792003E-15
tp -4.108435162309016E-13 9.323040476852608E-13 4.431408684220893E-9 -7.128180222629801E-12 1.35882363960483E-9 5.08290410988859E-12
node 3.504009536611527E-15 -8.013471716159178E-15 -7.128180222629801E-12 2.33942562714682E-9 -2.333331434190775E-9 6.424857804816064E-11
peri -1.102074364683096E-13 2.443174601357951E-13 1.35882363960483E-9 -2.333331434190775E-9 2.748487827761366E-9 -6.256282484082461E-11
i -1.443654706488224E-15 3.471033646792003E-15 5.08290410988859E-12 6.424857804816064E-11 -6.256282484082461E-11 1.763642655052605E-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 15.37   n/a MPCxxxxx  
diameter diameter 2.904 km 0.172 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.276   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

49915 (1999 XU171)          Discovered 1999-Dec-10 by LINEAR at Socorro
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 XU171 = 1980 FB7 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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