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JPL Small-Body Database Browser
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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 ]

[ show orbit diagram ]
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
(2018-Sep-30.59677541)
6.8958e-05 TDB
period 1318.743485631
3.61
8.9124e-06
2.44e-08
d
yr
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 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456148.5 (2012-Aug-09.0) TDB
Reference: JPL 22 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1118757250824742 4.4381e-08  
q 2.090629919957597 1.0216e-07 au
tp 2455754.090823387007
(2011-Jul-11.59082339)
6.7688e-05 TDB
node 292.2292364887213 6.0188e-05 deg
peri 239.6763341684671 6.2845e-05 deg
i 4.225012167157886 4.3562e-06 deg
  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
 Jupiter MOID = 2.36811 au 
 T_jup = 3.544 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.969701219964897E-15 -4.51641948959895E-15 -9.078227226536517E-14 4.263493524989871E-15 2.901070632996447E-15 -4.662761178060686E-16
q -4.51641948959895E-15 1.043640626895758E-14 1.911579166741615E-13 -9.985457644383592E-15 -5.460121464720164E-15 1.201273307591861E-15
tp -9.078227226536517E-14 1.911579166741615E-13 4.581696719301058E-9 1.2876730767774E-11 1.241382166119715E-9 8.880559124205616E-13
node 4.263493524989871E-15 -9.985457644383592E-15 1.2876730767774E-11 3.622594342117291E-9 -3.608799071893325E-9 2.728560675985139E-11
peri 2.901070632996447E-15 -5.460121464720164E-15 1.241382166119715E-9 -3.608799071893325E-9 3.949457106479964E-9 -2.695502429405359E-11
i -4.662761178060686E-16 1.201273307591861E-15 8.880559124205616E-13 2.728560675985139E-11 -2.695502429405359E-11 1.897664875336102E-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 14.8   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

[ hide close-approach data ]
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 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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