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18804 (1999 JS77)
Classification: Main-belt Asteroid          SPK-ID: 2018804
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .115306146871974 3.4314e-08  
a 2.360038408077461 9.3715e-09 au
q 2.087911472772181 7.9943e-08 au
i 7.497498686157683 3.8346e-06 deg
node 113.9566827996426 2.7084e-05 deg
peri 220.3662209749325 3.1503e-05 deg
M 96.96963855124427 1.5527e-05 deg
tp 2458243.794086443634
(2018-May-05.29408644)
5.7011e-05 TDB
period 1324.271501872521
3.63
7.8879e-06
2.16e-08
d
yr
n .2718475776991046 1.6192e-09 deg/d
Q 2.63216534338274 1.0452e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2070  
   data-arc span      10503 days (28.76 yr)  
   first obs. used      1991-03-06  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4979  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-14 00:31:44  

Additional Information
 Earth MOID = 1.08233 au 
 Jupiter MOID = 2.68108 au 
 T_jup = 3.531 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.5   n/a MPO358811  
diameter diameter 5.630 km 0.032 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 9.404 h n/a LCDB (Rev. 2019-January); Warner et al., 2009 Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.165   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18804 (1999 JS77)          Discovered 1999-May-12 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1999 JS77 = 1991 EQ6 = 1998 DX37 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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