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JPL Small-Body Database Browser
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1272 Gefion (1931 TZ1)
Classification: Main-belt Asteroid          SPK-ID: 2001272
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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1506364455271555 4.3045e-08  
a 2.784386622281181 1.1026e-08 au
q 2.364956518527381 1.1997e-07 au
i 8.415392943633375 4.7409e-06 deg
node 321.4153921575021 2.3441e-05 deg
peri 3.681230857471582 2.6437e-05 deg
M 342.6215052795203 1.1119e-05 deg
tp 2458682.422347793742
(2019-Jul-17.92234779)
5.237e-05 TDB
period 1697.04256209212
4.65
1.0081e-05
2.76e-08
d
yr
n .212133748464264 1.2601e-09 deg/d
Q 3.203816726034981 1.2687e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1982  
   data-arc span      37317 days (102.17 yr)  
   first obs. used      1917-09-26  
   last obs. used      2019-11-27  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49162  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-03 20:19:42  

Additional Information
 Earth MOID = 1.3521 au 
 Jupiter MOID = 2.12268 au 
 T_jup = 3.300 
[ 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 12.9   n/a MPO435707  
diameter diameter 6.965 km 0.169 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 3.087 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.252   0.041 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
SMASSII spectral type spec_B Sl   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

1272 Gefion (1931 TZ1)          Discovered 1931-Oct-10 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1931 TZ1 = A917 SF 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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