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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1125805950118165 4.3042e-08  
a 2.353217886667565 8.9253e-09 au
q 2.088291216794081 1.0013e-07 au
i 4.226431586914151 3.5229e-06 deg
node 292.1787435791708 5.9775e-05 deg
peri 239.4328170690389 6.1856e-05 deg
M 220.7583837175411 1.8708e-05 deg
tp 2459710.485928326280
(2022-May-10.98592833)
7.0072e-05 TDB
period 1318.534925830141
3.61
7.5014e-06
2.054e-08
d
yr
n .2730303103449051 1.5533e-09 deg/d
Q 2.618144556541049 9.9301e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1564  
   data-arc span      14733 days (40.34 yr)  
   first obs. used      1980-09-04  
   last obs. used      2021-01-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51359  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 05:03:11  

Additional Information
 Earth MOID = 1.09751 au 
 Jupiter MOID = 2.36712 au 
 T_jup = 3.544 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456851.5 (2014-Jul-13.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1120554955369872 4.3e-08  
q 2.090525514018479 1.0011e-07 au
tp 2457071.930508574255
(2015-Feb-18.43050857)
6.3525e-05 TDB
node 292.2310142261226 5.9787e-05 deg
peri 239.3459834221051 6.1895e-05 deg
i 4.225335370549422 3.5212e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1564  
   data-arc span      14733 days (40.34 yr)  
   first obs. used      1980-09-04  
   last obs. used      2021-01-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51359  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 05:03:11  

Additional Information
 Jupiter MOID = 2.36712 au 
 T_jup = 3.544 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.849040328006659E-15 -4.291777050892435E-15 2.963145685627249E-13 2.532435236782115E-15 1.016340771670186E-13 1.178400327322372E-15
q -4.291777050892435E-15 1.002255866684958E-14 -5.13055425543117E-13 -5.117879753683009E-15 -1.946677562772632E-13 -2.576194927622766E-15
tp 2.963145685627249E-13 -5.13055425543117E-13 4.035484323145924E-9 8.852447999090827E-12 1.039990812639011E-9 1.38936408252724E-12
node 2.532435236782115E-15 -5.117879753683009E-15 8.852447999090827E-12 3.574470828260015E-9 -3.562244840735654E-9 3.87714326623089E-11
peri 1.016340771670186E-13 -1.946677562772632E-13 1.039990812639011E-9 -3.562244840735654E-9 3.830964513877842E-9 -3.829709818327228E-11
i 1.178400327322372E-15 -2.576194927622766E-15 1.38936408252724E-12 3.87714326623089E-11 -3.829709818327228E-11 1.239862026843875E-11

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 14.88   n/a E2021B10  
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 25 CATAB v2.0f-lin.ifort 2021-Feb-24 05:03:14 2021-Feb-24 05:03

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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