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821 Fanny (A916 GH)
Classification: Main-belt Asteroid          SPK-ID: 2000821
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2123005712013089 3.378e-08  
a 2.771795219602853 8.7889e-09 au
q 2.18334151122811 9.3484e-08 au
i 5.398941844885096 4.224e-06 deg
node 209.7564219201168 3.3408e-05 deg
peri 32.86200345268896 3.4493e-05 deg
M 150.4145284581008 9.5537e-06 deg
tp 2458296.249077100966
(2018-Jun-26.74907710)
4.3616e-05 TDB
period 1685.544174772154
4.61
8.0169e-06
2.195e-08
d
yr
n .2135808751785836 1.0158e-09 deg/d
Q 3.360248927977596 1.0655e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3256  
   data-arc span      38159 days (104.47 yr)  
   first obs. used      1916-04-01  
   last obs. used      2020-09-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44692  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Oct-22 15:29:51  

Additional Information
 Earth MOID = 1.1731 au 
 Jupiter MOID = 1.6627 au 
 T_jup = 3.297 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456382.5 (2013-Mar-31.0) TDB
Reference: JPL 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2117247481503182 3.3694e-08  
q 2.184935205852378 9.3188e-08 au
tp 2456612.049186359116
(2013-Nov-15.54918636)
4.2305e-05 TDB
node 209.7723044792615 3.3403e-05 deg
peri 33.15712488771436 3.4505e-05 deg
i 5.398292897332329 4.2248e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3256  
   data-arc span      38159 days (104.47 yr)  
   first obs. used      1916-04-01  
   last obs. used      2020-09-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44692  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Oct-22 15:29:51  

Additional Information
 Jupiter MOID = 1.6627 au 
 T_jup = 3.297 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.135259725388173E-15 -3.131078034783939E-15 -3.851486335452846E-13 4.942564963631099E-17 -9.56079367494188E-14 3.416878240851183E-16
q -3.131078034783939E-15 8.684062395923015E-15 1.095990550058712E-12 5.161645741325195E-16 2.673070610186045E-13 -7.973831589454632E-16
tp -3.851486335452846E-13 1.095990550058712E-12 1.789677946582682E-9 -7.285510024762699E-12 3.752008057969568E-10 -1.063022906463811E-14
node 4.942564963631099E-17 5.161645741325195E-16 -7.285510024762699E-12 1.1157803920201E-9 -1.111748669863015E-9 -8.866965528867436E-12
peri -9.56079367494188E-14 2.673070610186045E-13 3.752008057969568E-10 -1.111748669863015E-9 1.190613213494417E-9 8.815462829836253E-12
i 3.416878240851183E-16 -7.973831589454632E-16 -1.063022906463811E-14 -8.866965528867436E-12 8.815462829836253E-12 1.784865708391748E-11

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 11.8   n/a MPO502161  
diameter diameter 28.856 km 0.168 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 236.6 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pilcher, F. (2018) Minor Planet Bull. 45, 356-359.]
[Polakis, T. (2018) Minor Planet Bull. 45, 347-352.]
geometric albedo albedo 0.025   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.706   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=1.47 deg.
U-B UB 0.321   0.027 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=1.47 deg.
Tholen spectral type spec_T C   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices
SMASSII spectral type spec_B Ch   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)

821 Fanny (A916 GH)          Discovered 1916-Mar-31 by Wolf, M. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A916 GH = 1930 HC = 1930 HO = 1930 HT 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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