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49639 (1999 JJ17)
Classification: Main-belt Asteroid          SPK-ID: 2049639
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 26 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .187794806336856 3.5325e-08  
a 3.145645965035727 1.9717e-08 au
q 2.55490999022753 1.1192e-07 au
i 14.5804712211822 4.0702e-06 deg
node 91.95718850836523 1.9863e-05 deg
peri 4.998437054238737 2.4607e-05 deg
M 46.42270018125807 1.3001e-05 deg
tp 2458737.720738924457
(2019-Sep-11.22073892)
7.3812e-05 TDB
period 2037.807659137155
5.58
1.916e-05
5.246e-08
d
yr
n .1766604411293805 1.661e-09 deg/d
Q 3.736381939843924 2.342e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1278  
   data-arc span      8647 days (23.67 yr)  
   first obs. used      1996-10-10  
   last obs. used      2020-06-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48699  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 23:31:37  

Additional Information
 Earth MOID = 1.57203 au 
 Jupiter MOID = 1.47755 au 
 T_jup = 3.132 
[ 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 13.6   n/a MPO324754  
diameter diameter 8.088 km 0.388 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 1.21038 h n/a LCDB (Rev. 2020-October); 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:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.107   0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

49639 (1999 JJ17)          Discovered 1999-May-15 by Spacewatch at Kitt Peak
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 JJ17 = 1998 GH2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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