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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 | 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 .1067356347389036 3.1776e-08  
a 2.44811081831792 1.24e-08 au
q 2.18681015621358 7.8854e-08 au
i 7.469114692032981 5.1925e-06 deg
node 350.8605450347088 2.5698e-05 deg
peri 254.4396462839382 3.6563e-05 deg
M 256.5573935409579 2.4786e-05 deg
tp 2459402.514752755519
(2021-Jul-07.01475276)
9.599e-05 TDB
period 1399.088015529564
3.83
1.0629e-05
2.91e-08
d
yr
n .2573104736829137 1.9549e-09 deg/d
Q 2.70941148042226 1.3723e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1290  
   data-arc span      10885 days (29.80 yr)  
   first obs. used      1990-04-15  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50413  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 22:59:12  

Additional Information
 Earth MOID = 1.18841 au 
 Jupiter MOID = 2.34006 au 
 T_jup = 3.478 
[ 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 14.5   n/a MPO452453  
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. 2019-August); 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

[ show close-approach data ]
Alternate Designations
 1990 GD = 1995 SD49 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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