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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1358381230356606 5.1572e-08  
a 2.576078752526927 1.2237e-08 au
q 2.226149049991623 1.3841e-07 au
i 6.321122903701514 4.5464e-06 deg
node 119.8324081057979 3.5436e-05 deg
peri 72.27741569776911 3.9308e-05 deg
M 108.2116545754706 1.9252e-05 deg
tp 2458746.549324175466
(2019-Sep-20.04932418)
7.9003e-05 TDB
period 1510.209264777998
4.13
1.076e-05
2.946e-08
d
yr
n .238377560246871 1.6985e-09 deg/d
Q 2.926008455062231 1.3899e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1800  
   data-arc span      15530 days (42.52 yr)  
   first obs. used      1978-03-06  
   last obs. used      2020-09-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53606  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:18:12  

Additional Information
 Earth MOID = 1.23552 au 
 Jupiter MOID = 2.0515 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 14.16   n/a E2021B10  
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. 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:
[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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