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9954 Brachiosaurus (1991 GX7)
Classification: Main-belt Asteroid          SPK-ID: 2009954
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1291667938729132 2.5617e-08  
a 2.759239814073379 1.1875e-08 au
q 2.402837653763028 7.4886e-08 au
i 9.076830807073502 9.9664e-07 deg
node 3.447498992468411 7.0636e-06 deg
peri 48.6127212533506 1.5057e-05 deg
M 318.8608648434146 1.1798e-05 deg
tp 2459391.808935707394
(2021-Jun-26.30893571)
5.5147e-05 TDB
period 1674.104635221946
4.58
1.0808e-05
2.959e-08
d
yr
n .2150403221076278 1.3883e-09 deg/d
Q 3.115641974383731 1.3409e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2059  
   data-arc span      13231 days (36.22 yr)  
   first obs. used      1984-11-21  
   last obs. used      2021-02-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4358  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-16 21:43:25  

Additional Information
 Earth MOID = 1.42274 au 
 Jupiter MOID = 2.31683 au 
 T_jup = 3.312 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457349.5 (2015-Nov-23.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1318714674766573 2.5643e-08  
q 2.395506324188632 7.5052e-08 au
tp 2457711.580027737539
(2016-Nov-19.08002774)
5.1996e-05 TDB
node 3.722438692157537 7.0431e-06 deg
peri 47.35014209969852 1.479e-05 deg
i 9.086286380316094 9.9395e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2059  
   data-arc span      13231 days (36.22 yr)  
   first obs. used      1984-11-21  
   last obs. used      2021-02-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4358  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-16 21:43:25  

Additional Information
 Jupiter MOID = 2.31683 au 
 T_jup = 3.312 
Orbit Covariance (6×6)
  e q tp node peri i
e 6.575464571241086E-16 -1.908709314009856E-15 -6.97445642868677E-14 -3.638688135834734E-14 9.071707865990916E-14 2.467903138251472E-15
q -1.908709314009856E-15 5.63280069211758E-15 2.266552826620507E-13 1.019509796785203E-13 -2.60317749528021E-13 -7.043927127311925E-15
tp -6.97445642868677E-14 2.266552826620507E-13 2.703564740742712E-9 -1.388244923656215E-10 6.671562397511873E-10 3.921783916813497E-12
node -3.638688135834734E-14 1.019509796785203E-13 -1.388244923656215E-10 4.960505459362346E-11 -7.851889958644737E-11 -5.916289253713735E-12
peri 9.071707865990916E-14 -2.60317749528021E-13 6.671562397511873E-10 -7.851889958644737E-11 2.187577185452209E-10 6.787077777269294E-12
i 2.467903138251472E-15 -7.043927127311925E-15 3.921783916813497E-12 -5.916289253713735E-12 6.787077777269294E-12 9.879353062467154E-13

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.42   n/a E2021B10  
rotation period rot_per 8.78889 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]

9954 Brachiosaurus           Discovered 1991 Apr. 8 by E. W. Elst at the European Southern Observatory.
Brachiosaurus, the heaviest of all dinosaurs (about 70 tons) had a very long neck with a small head. Preferring swampy areas, where the water would have supported its weight, it lived during in Jurassic--Lower Cretaceous times.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20021120/MPCPages.arcLast Updated: 2003-10-02

Alternate Designations
 1991 GX7 = 1984 WP5 = 1993 UO3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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