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

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3288789316159895 2.9777e-08  
a 2.383681374621523 6.5389e-09 au
q 1.599738790823064 7.2695e-08 au
i 19.54702564089045 4.8278e-06 deg
node 224.4823283425721 1.108e-05 deg
peri 97.32850037894268 1.3691e-05 deg
M 114.6213613854873 7.3608e-06 deg
tp 2458772.509831272895
2.6789e-05 TDB
period 1344.221172034223
n .2678130708618497 1.102e-09 deg/d
Q 3.167623958419983 8.6894e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1804  
   data-arc span      15011 days (41.10 yr)  
   first obs. used      1979-12-18  
   last obs. used      2021-01-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45666  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 01:39:19  

Additional Information
 Earth MOID = .723053 au 
 Jupiter MOID = 2.57283 au 
 T_jup = 3.388 
[ show covariance matrix ]

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.2   n/a MPO279597  
rotation period rot_per 7.230 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Behrend, R. (2008) Observatoire de Geneve web site,]
[Warner, B.D. (2009) Minor Planet Bull. 36, 7-13.]
[Stephens, R.D. (2017) Minor Planet Bull. 44, 120-122.]
[Behrend, R. (2019) Observatoire de Geneve web site,]
[Clark, M. (2020) Minor Planet Bull. 47, 163-165.]
[Stephens, R.D.; Warner, B.D. (2020) Minor Planet Bull. 47, 224-230.]

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 | Mission Design | Physical Parameters | Discovery Circumstances ]
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