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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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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1124397595990943 4.4477e-08  
a 2.353466027593638 1.0604e-08 au
q 2.088842873226374 1.0242e-07 au
i 4.226406792877856 4.3583e-06 deg
node 292.1785912969524 6.0159e-05 deg
peri 239.4868829033763 6.2777e-05 deg
M 166.0862504647393 1.9113e-05 deg
tp 2458392.096775407629
6.8958e-05 TDB
period 1318.743485631
n .2729871304939528 1.8449e-09 deg/d
Q 2.618089181960902 1.1796e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1274  
   data-arc span      14229 days (38.96 yr)  
   first obs. used      1980-09-04  
   last obs. used      2019-08-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54088  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-24 02:17:16  

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] (  
geometric albedo albedo 0.027   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

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
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 22 CATAB v2.0f-lin.ifort 2019-Sep-24 02:17:21 2019-Sep-24 02:17

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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