Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP

Significant website upgrade scheduled for September 27. More details available here.

JPL Small-Body Database Browser
Search: [ help ]  
6401 Roentgen (1991 GB2)
Classification: Main-belt Asteroid          SPK-ID: 2006401
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ hide orbit diagram ]

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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 48 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1273167842146979 8.7216e-09  
a 2.677505242778913 9.7635e-09 au
q 2.336613885550307 2.7497e-08 au
i 13.46433839517734 2.1602e-07 deg
node 136.3233263122178 1.0253e-06 deg
peri 93.15003258356599 8.3885e-06 deg
M 314.2654442816864 1.0931e-05 deg
tp 2459599.799301034458
(2022-Jan-20.29930103)
4.9083e-05 TDB
period 1600.27242471054
4.38
8.7531e-06
2.396e-08
d
yr
n .2249616967967921 1.2305e-09 deg/d
Q 3.018396600007518 1.1007e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2840  
   data-arc span      25716 days (70.41 yr)  
   first obs. used      1951-02-04  
   last obs. used      2021-07-02  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42688  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 11:47:22  

Additional Information
 Earth MOID = 1.37398 au 
 Jupiter MOID = 2.11648 au 
 T_jup = 3.327 
[ 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 12.85   n/a MPO636161  
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. 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:
[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

Alternate Designations
 1991 GB2 = 1973 DM = 1983 OF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2021-Sep-26 06:46 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin