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15891 Alissazhang (1997 GG7)
Classification: Main-belt Asteroid          SPK-ID: 2015891
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2004303678318202 5.1307e-08  
a 2.316967293182616 6.4418e-09 au
q 1.852576686355727 1.1961e-07 au
i 4.376708865907159 4.6445e-06 deg
node 181.2255380194954 3.8183e-05 deg
peri 169.7983712778361 3.8993e-05 deg
M 193.876554753361 7.9389e-06 deg
tp 2459990.938199889520
(2023-Feb-15.43819989)
2.8488e-05 TDB
period 1288.18513029579
3.53
5.3723e-06
1.471e-08
d
yr
n .2794629370681663 1.1655e-09 deg/d
Q 2.781357900009505 7.7329e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1512  
   data-arc span      10784 days (29.52 yr)  
   first obs. used      1991-12-03  
   last obs. used      2021-06-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53966  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 17:31:38  

Additional Information
 Earth MOID = .846257 au 
 Jupiter MOID = 2.65526 au 
 T_jup = 3.549 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457469.5 (2016-Mar-22.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2014897976294564 5.1434e-08  
q 1.849773625565675 1.2002e-07 au
tp 2457414.187283395583
(2016-Jan-26.68728340)
2.9466e-05 TDB
node 181.2788498589264 3.8154e-05 deg
peri 169.6612451174578 3.8952e-05 deg
i 4.378421490920839 4.6479e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1512  
   data-arc span      10784 days (29.52 yr)  
   first obs. used      1991-12-03  
   last obs. used      2021-06-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .53966  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 17:31:38  

Additional Information
 Jupiter MOID = 2.65526 au 
 T_jup = 3.549 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.64547667092525E-15 -6.167487302935912E-15 7.504816000285586E-13 3.219633209925522E-14 9.718926536134325E-14 -3.288248056533811E-15
q -6.167487302935912E-15 1.440423814777466E-14 -1.783561137415721E-12 -7.530366301205654E-14 -2.358950544092599E-13 7.838255953215824E-15
tp 7.504816000285586E-13 -1.783561137415721E-12 8.682186995754769E-10 1.141754630027451E-11 2.287427970310027E-10 -1.685547029836997E-12
node 3.219633209925522E-14 -7.530366301205654E-14 1.141754630027451E-11 1.455715188892678E-9 -1.448601143041275E-9 3.69655606620953E-11
peri 9.718926536134325E-14 -2.358950544092599E-13 2.287427970310027E-10 -1.448601143041275E-9 1.517275490785186E-9 -3.725550644962956E-11
i -3.288248056533811E-15 7.838255953215824E-15 -1.685547029836997E-12 3.69655606620953E-11 -3.725550644962956E-11 2.160302804734577E-11

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.07   n/a MPCxxxxx  

15891 Alissazhang           Discovered 1997 Apr. 2 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Alissa Yuan Zhang (b. 1994) is a finalist in the 2012 Intel Science Talent Search, a science competition for high-school seniors, for her chemistry project. She attends the Saratoga High School, Saratoga, California.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20120506/MPCPages.arcLast Updated: 2012-05-09

Alternate Designations
 1997 GG7 = 1998 WL11 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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