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30840 Jackalice (1991 GC2)
Classification: Main-belt Asteroid          SPK-ID: 2030840
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 24 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2029843881976929 4.257e-08  
a 2.655295855029078 1.1992e-08 au
q 2.11631225041213 1.1265e-07 au
i 12.24200918971457 3.3145e-06 deg
node 120.4837832937046 2.2826e-05 deg
peri 76.34922907398739 2.4366e-05 deg
M 275.4271440273926 1.1152e-05 deg
tp 2459371.775506373659
(2021-Jun-06.27550637)
5.0212e-05 TDB
period 1580.402846249019
4.33
1.0707e-05
2.931e-08
d
yr
n .2277900225593974 1.5432e-09 deg/d
Q 3.194279459646025 1.4427e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1644  
   data-arc span      10517 days (28.79 yr)  
   first obs. used      1991-04-15  
   last obs. used      2020-01-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48116  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 02:09:26  

Additional Information
 Earth MOID = 1.15526 au 
 Jupiter MOID = 1.90137 au 
 T_jup = 3.327 
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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 13.8   n/a MPO365618  
diameter diameter 4.684 km 0.998 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.292   0.204 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

30840 Jackalice           Discovered 1991 Apr. 15 by C. S. Shoemaker and D. H. Levy at Palomar.
Jack Newton (b. 1942) is a Canadian astrophotographer credited with some of the most famous ground-based photographs ever taken. His work, from the sun to a gravitational lens, has appeared in major news magazines. His wife Alice has long assisted him in every one of his outreach efforts, in both Canada and the U.S.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20050919/MPCPages.arcLast Updated: 2005-09-26

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Alternate Designations
 1991 GC2 = 1999 BJ24 
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