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JPL Small-Body Database Browser
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6401 Roentgen (1991 GB2)
Classification: Main-belt Asteroid          SPK-ID: 2006401
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1279274900551978 3.5566e-08  
a 2.676799428254447 1.1002e-08 au
q 2.334363196016668 9.5579e-08 au
i 13.4633948232967 3.5144e-06 deg
node 136.3360959148622 1.7365e-05 deg
peri 93.05930865653865 2.235e-05 deg
M 135.309587749459 1.5673e-05 deg
tp 2457999.259477900390
(2017-Sep-02.75947790)
6.8237e-05 TDB
period 1599.639697052619
4.38
9.8619e-06
2.7e-08
d
yr
n .2250506790143493 1.3875e-09 deg/d
Q 3.019235660492228 1.2409e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2136  
   data-arc span      25143 days (68.84 yr)  
   first obs. used      1951-02-04  
   last obs. used      2019-12-07  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46158  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 22:12:36  

Additional Information
 Earth MOID = 1.3714 au 
 Jupiter MOID = 2.11873 au 
 T_jup = 3.327 
[ show covariance matrix ]

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 12.8   n/a MPO452258  
diameter diameter 7.880 km 0.184 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 15.96 h n/a LCDB (Rev. 2019-January); 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:
[Behrend, R. (2013) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Warner, B.D. (2014) Minor Planet Bull. 41, 27-32.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.259   0.044 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

6401 Roentgen (1991 GB2)          Discovered 1991-Apr-15 by Shoemaker, C. S. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1991 GB2 = 1973 DM = 1983 OF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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