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7778 Markrobinson (1993 HK1)
Classification: Mars-crossing Asteroid          SPK-ID: 2007778
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]

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Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.

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Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2457600.5 (2016-Jul-31.0) TDB
Reference: JPL 12 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3291032344007822 4.089e-08  
a 2.38307245107684 9.9293e-09 au
q 1.598795599616052 9.6356e-08 au
i 19.5533222790663 7.2847e-06 deg
node 224.489619418352 1.474e-05 deg
peri 97.43248494196195 1.8848e-05 deg
M 45.8091290125525 1.1376e-05 deg
tp 2457429.516646859837
4.1899e-05 JED
period 1343.706122716105
n .2679157249594969 1.6744e-09 deg/d
Q 3.167349302537628 1.3197e-08 au
  Orbit Determination Parameters
   # obs. used (total)      903  
   data-arc span      12131 days (33.21 yr)  
   first obs. used      1982-05-19  
   last obs. used      2015-08-05  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-BIG16  
   condition code      0  
   fit RMS      .52605  
   data source      ORB  
   producer      Otto Matic  
   solution date      2015-Sep-02 14:23:04  

Additional Information
 Earth MOID = .722922 au 
 Jupiter MOID = 2.56565 au 
 T_jup = 3.388 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.2 mag n/a MPO279597  
rotation period rot_per 7.230 h n/a LCDB (Rev. 2016-February); Warner et al., 2009 Published Reference List:
[Behrend, R. (2008) Observatoire de Geneve web site,]
[Warner, B.D. (2009) Minor Planet Bul. 36, 7-13.]

7778 Markrobinson           Discovered 1993 Apr. 17 by C. S. Shoemaker and E. M. Shoemaker at Palomar.
Named in honor of Mark Robinson, a planetary geologist who has worked on M-type bodies (Mercury, Moon, Mars, and Minor Planets). He began his career in Alaska, where he prospected for mineral ores and earned his B.S. in geology at the University of Alaska. In Hawaii, he completed his doctorate in 1993 on lunar and martian volcanism and then began his outstanding work on the Clementine mission to the Moon as a member of the U.S. Geological Survey Astrogeology Branch. His efforts, which he continues from his new base at Northwestern University, are now directed to the NEAR spacecraft mission and to future exploration of Mercury. Citation prepared with the assistance of A. McEwen.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990202/MPCPages.arcLast Updated: 2010-06-11

Alternate Designations
 1993 HK1 = 1979 YT3 = 1982 KG = 1990 UO11 = 1990 VB2 
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ]
FirstGov 2016-May-02 01:23 UT
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