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866 Fatme (A917 DG)
Classification: Main-belt Asteroid          SPK-ID: 2000866
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 66 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05241132152285271 2.1677e-08  
a 3.124715796101141 1.1911e-08 au
q 2.960945311844148 6.4782e-08 au
i 8.66116009816464 8.9356e-07 deg
node 91.0624373865823 4.391e-06 deg
peri 263.4448647175095 1.3201e-05 deg
M 69.9939946752627 1.1674e-05 deg
tp 2458808.241385036111
(2019-Nov-20.74138504)
6.494e-05 TDB
period 2017.503102118381
5.52
1.1536e-05
3.158e-08
d
yr
n .1784383873422547 1.0203e-09 deg/d
Q 3.288486280358135 1.2535e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3651  
   data-arc span      38003 days (104.05 yr)  
   first obs. used      1917-02-25  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41892  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:33:26  

Additional Information
 Earth MOID = 1.9701 au 
 Jupiter MOID = 1.99103 au 
 T_jup = 3.195 
[ 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 9.57   n/a E2021B10  
diameter diameter 78.061 km 0.360 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 5.800 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:
[Polakis, T. (2018) Minor Planet Bull. 45, 347-352.]
geometric albedo albedo 0.046   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
SMASSII spectral type spec_B X   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)

866 Fatme (A917 DG)          Discovered 1917-Feb-25 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A917 DG = 1950 DF1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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