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JPL Small-Body Database Browser
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17944 (1999 JF7)
Classification: Main-belt Asteroid          SPK-ID: 2017944
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 .1352635390727203 5.7357e-08  
a 2.57534890172169 1.2677e-08 au
q 2.226998094927771 1.5359e-07 au
i 6.320277624290666 4.5937e-06 deg
node 119.8340953461769 3.8121e-05 deg
peri 72.16666717298487 4.1912e-05 deg
M 60.70327091522381 2.0201e-05 deg
tp 2458745.956429963898
(2019-Sep-19.45642996)
8.3599e-05 TDB
period 1509.567504870903
4.13
1.1146e-05
3.052e-08
d
yr
n .2384789013001355 1.7609e-09 deg/d
Q 2.923699708515609 1.4392e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1735  
   data-arc span      15058 days (41.23 yr)  
   first obs. used      1978-03-06  
   last obs. used      2019-05-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54359  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:15:33  

Additional Information
 Earth MOID = 1.23702 au 
 Jupiter MOID = 2.0548 au 
 T_jup = 3.406 
[ 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 14.2   n/a MPO474004  
diameter diameter 7.683 km 0.204 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 6.62 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:
[Chang, C.-K.; Lin, H.-W.; Ip, W.-H.; Prince, T.A.; et al. (2016) Astrophys. J. Sup. Ser. 227, A20.]
geometric albedo albedo 0.075   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

17944 (1999 JF7)          Discovered 1999-May-08 by CSS at Catalina
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 JF7 = 1978 EN5 = 1982 BQ3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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