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49781 (1999 XT7)
Classification: Main-belt Asteroid          SPK-ID: 2049781
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 .1830383475814248 8.8977e-08  
a 2.552881167423467 1.4053e-08 au
q 2.085606016966537 2.3414e-07 au
i 12.58733815130393 6.1399e-06 deg
node 340.9163001939301 2.8244e-05 deg
peri 79.88321976719682 3.5695e-05 deg
M 30.15191165007639 2.0761e-05 deg
tp 2458875.716639491354
(2020-Jan-27.21663949)
8.5422e-05 TDB
period 1489.85610943838
4.08
1.2302e-05
3.368e-08
d
yr
n .2416340730620667 1.9951e-09 deg/d
Q 3.020156317880397 1.6625e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1268  
   data-arc span      25529 days (69.89 yr)  
   first obs. used      1950-12-09  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43661  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 23:30:53  

Additional Information
 Earth MOID = 1.13991 au 
 Jupiter MOID = 2.436 au 
 T_jup = 3.382 
[ 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 13.9   n/a MPO359075  
diameter diameter 5.240 km 0.221 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 6.436 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.256   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

49781 (1999 XT7)          Discovered 1999-Dec-04 by Juels, C. W. at Fountain Hills
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 XT7 = 1988 EF2 = 1992 BG5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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