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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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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1505442091012239 4.2088e-08  
a 2.784346916873382 1.0764e-08 au
q 2.365179612409248 1.1696e-07 au
i 8.415794065562105 4.5196e-06 deg
node 321.4117743582179 2.3098e-05 deg
peri 3.780094920906182 2.6052e-05 deg
M 67.40667707404742 1.0869e-05 deg
tp 2458682.751241321281
(2019-Jul-18.25124132)
5.1413e-05 TDB
period 1697.006262431242
4.65
9.8402e-06
2.694e-08
d
yr
n .2121382860922626 1.2301e-09 deg/d
Q 3.203514221337517 1.2384e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2209  
   data-arc span      37654 days (103.09 yr)  
   first obs. used      1917-09-26  
   last obs. used      2020-10-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47423  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:20:44  

Additional Information
 Earth MOID = 1.35323 au 
 Jupiter MOID = 2.1261 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 3.086 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Benishek, V. (2020) Minor Planet Bull. 47, 75-83.]
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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