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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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1125805958676129 4.3036e-08  
a 2.353217883845167 8.9239e-09 au
q 2.088291212275555 1.0012e-07 au
i 4.226431636534965 3.5221e-06 deg
node 292.1787442109403 5.977e-05 deg
peri 239.4328159322017 6.1852e-05 deg
M 220.7583845835973 1.8708e-05 deg
tp 2459710.485924236767
(2022-May-10.98592424)
7.0072e-05 TDB
period 1318.534923458009
3.61
7.5002e-06
2.053e-08
d
yr
n .2730303108361049 1.5531e-09 deg/d
Q 2.618144555414779 9.9285e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1568  
   data-arc span      14790 days (40.49 yr)  
   first obs. used      1980-09-04  
   last obs. used      2021-03-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51311  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 10:21:52  

Additional Information
 Earth MOID = 1.09751 au 
 Jupiter MOID = 2.36712 au 
 T_jup = 3.544 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456853.5 (2014-Jul-15.0) TDB
Reference: JPL 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1120551063931602 4.2994e-08  
q 2.09053549326479 1.001e-07 au
tp 2457071.923584081127
(2015-Feb-18.42358408)
6.3526e-05 TDB
node 292.2310365319663 5.9782e-05 deg
peri 239.3434290991159 6.189e-05 deg
i 4.225327999718075 3.5204e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1568  
   data-arc span      14790 days (40.49 yr)  
   first obs. used      1980-09-04  
   last obs. used      2021-03-03  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .51311  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 10:21:52  

Additional Information
 Jupiter MOID = 2.36712 au 
 T_jup = 3.544 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.848508612372817E-15 -4.290631671638917E-15 2.964521761577733E-13 2.518705569990203E-15 1.017151720291047E-13 1.176572798835999E-15
q -4.290631671638917E-15 1.002009875959298E-14 -5.133162946286035E-13 -5.084641386415802E-15 -1.948396419085412E-13 -2.57224701161047E-15
tp 2.964521761577733E-13 -5.133162946286035E-13 4.035520980411124E-9 8.835052241966893E-12 1.040009415787035E-9 1.388034666055527E-12
node 2.518705569990203E-15 -5.084641386415802E-15 8.835052241966893E-12 3.573923798389381E-9 -3.561704194030533E-9 3.871877888529843E-11
peri 1.017151720291047E-13 -1.948396419085412E-13 1.040009415787035E-9 -3.561704194030533E-9 3.830426849656526E-9 -3.824490630477493E-11
i 1.176572798835999E-15 -2.57224701161047E-15 1.388034666055527E-12 3.871877888529843E-11 -3.824490630477493E-11 1.239330337462778E-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 26 CATAB v2.0f-lin.ifort 2021-Apr-13 10:21:57 2021-Apr-13 10:21

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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