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19985 (1990 GD)
Classification: Main-belt Asteroid          SPK-ID: 2019985
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1066579050680329 3.1388e-08  
a 2.447737863961193 1.1881e-08 au
q 2.186667271235391 7.8283e-08 au
i 7.469758660200403 5.0434e-06 deg
node 350.858744210822 2.512e-05 deg
peri 254.5171962131395 3.553e-05 deg
M 307.9417730902949 2.3685e-05 deg
tp 2459402.770550826825
(2021-Jul-07.27055083)
9.1805e-05 TDB
period 1398.768314256236
3.83
1.0185e-05
2.789e-08
d
yr
n .2573692843417189 1.8739e-09 deg/d
Q 2.708808456686996 1.3149e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1389  
   data-arc span      11299 days (30.93 yr)  
   first obs. used      1990-04-15  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .50693  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 03:00:43  

Additional Information
 Earth MOID = 1.18683 au 
 Jupiter MOID = 2.33967 au 
 T_jup = 3.478 
[ 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 14.55   n/a E2021B10  
diameter diameter 3.531 km 0.115 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 5.326506 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 sidereal period (not synodic); Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.270   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

19985 (1990 GD)          Discovered 1990-Apr-15 by Elst, E. W. at La Silla
Reference: 20010109/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1990 GD = 1995 SD49 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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