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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 ]

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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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .12485385187474 2.8437e-08  
a 2.262824820899266 6.3984e-09 au
q 1.980302425892224 6.4983e-08 au
i 4.606083349010568 3.8353e-06 deg
node 322.878084925384 4.7759e-05 deg
peri 108.3957561054508 5.1153e-05 deg
M 136.7808567150927 1.8532e-05 deg
tp 2458924.113316450049
(2020-Mar-15.61331645)
6.3526e-05 TDB
period 1243.296833797485
3.40
5.2733e-06
1.444e-08
d
yr
n .2895527360915315 1.2281e-09 deg/d
Q 2.545347215906308 7.1972e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1280  
   data-arc span      15055 days (41.22 yr)  
   first obs. used      1980-03-23  
   last obs. used      2021-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49004  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 21:42:11  

Additional Information
 Earth MOID = 1.00042 au 
 Jupiter MOID = 2.69011 au 
 T_jup = 3.604 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457452.5 (2016-Mar-05.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1240356040765861 2.8465e-08  
q 1.982698108470774 6.5028e-08 au
tp 2457678.928906907894
(2016-Oct-17.42890691)
6.3198e-05 TDB
node 322.9974991757367 4.7736e-05 deg
peri 107.9402843087077 5.1187e-05 deg
i 4.606369322505214 3.838e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1280  
   data-arc span      15055 days (41.22 yr)  
   first obs. used      1980-03-23  
   last obs. used      2021-06-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .49004  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 21:42:11  

Additional Information
 Jupiter MOID = 2.69011 au 
 T_jup = 3.604 
Orbit Covariance (6×6)
  e q tp node peri i
e 8.10251291639235E-16 -1.844178279500424E-15 -6.515332416133746E-13 -8.282421306101323E-16 -1.95749821329029E-13 -6.357910030851884E-16
q -1.844178279500424E-15 4.22867890960366E-15 1.528569749388186E-12 2.209564346592578E-15 4.567732112671124E-13 1.587007063906268E-15
tp -6.515332416133746E-13 1.528569749388186E-12 3.993938632376826E-9 3.552727905653892E-12 1.183327872886407E-9 2.302474450064086E-12
node -8.282421306101323E-16 2.209564346592578E-15 3.552727905653892E-12 2.278714597797238E-9 -2.269784372381305E-9 7.668290636966157E-11
peri -1.95749821329029E-13 4.567732112671124E-13 1.183327872886407E-9 -2.269784372381305E-9 2.620130669318004E-9 -7.577951617774787E-11
i -6.357910030851884E-16 1.587007063906268E-15 2.302474450064086E-12 7.668290636966157E-11 -7.577951617774787E-11 1.473002542300748E-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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