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49856 (1999 XC99)
Classification: Main-belt Asteroid          SPK-ID: 2049856
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 23 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1124397522020246 4.3258e-08  
a 2.353466032672928 9.176e-09 au
q 2.088842895143302 1.0053e-07 au
i 4.226414933792968 3.6908e-06 deg
node 292.1785931060056 5.982e-05 deg
peri 239.48685640 6.1962e-05 deg
M 166.086273910413 1.8626e-05 deg
tp 2458392.096687552392
(2018-Sep-30.59668755)
6.6614e-05 TDB
period 1318.743489900202
3.61
7.7125e-06
2.112e-08
d
yr
n .2729871296102047 1.5965e-09 deg/d
Q 2.618089170202554 1.0208e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1522  
   data-arc span      14660 days (40.14 yr)  
   first obs. used      1980-09-04  
   last obs. used      2020-10-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .519  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 23:30:30  

Additional Information
 Earth MOID = 1.09841 au 
 Jupiter MOID = 2.36811 au 
 T_jup = 3.544 
[ 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 14.8   n/a MPO436132  
diameter diameter 3.982 km 0.549 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
geometric albedo albedo 0.027   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

49856 (1999 XC99)          Discovered 1999-Dec-07 by LINEAR at Socorro
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1954-Dec-07 18:48 < 00:01 Eunom 0.0495274843690982 0.0495259488849644 0.0495290207579781 5.58953857914472 5.58953852843729 2435084.283062954 0.256059006876568 398.031597522989 39.8136937277844 -80.5011628493764 183471.299432266 T 23 CATAB v2.0f-lin.ifort 2020-Nov-12 23:30:37 2020-Nov-12 23:30

Alternate Designations
 1999 XC99 = 1980 RH1 = 1994 NW5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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