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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.


Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2118282187211279 3.2977e-08  
a 2.772879799712078 8.541e-09 au
q 2.185505611011271 9.1633e-08 au
i 5.397360014838367 3.9165e-06 deg
node 209.7417729936668 3.1427e-05 deg
peri 32.87854233072989 3.2377e-05 deg
M 234.9539374895658 9.4706e-06 deg
tp 2459982.317731997648
(2023-Feb-06.81773200)
4.5719e-05 TDB
period 1686.533580388072
4.62
7.7923e-06
2.133e-08
d
yr
n .2134555778706546 9.8623e-10 deg/d
Q 3.360253988412886 1.035e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3684  
   data-arc span      38359 days (105.02 yr)  
   first obs. used      1916-04-01  
   last obs. used      2021-04-09  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4402  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 11:36:51  

Additional Information
 Earth MOID = 1.17557 au 
 Jupiter MOID = 1.66037 au 
 T_jup = 3.297 
[ 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 11.83   n/a E2021B10  
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. 2020-October); 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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