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722 Frieda (A911 UN)
Classification: Main-belt Asteroid          SPK-ID: 2000722
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 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1446726130913155 3.2912e-08  
a 2.171661263564285 5.1919e-09 au
q 1.857481353815252 7.2849e-08 au
i 5.637103519311329 4.1887e-06 deg
node 45.66787261277187 3.2165e-05 deg
peri 257.2281834828824 3.5726e-05 deg
M 47.84481453050745 1.7058e-05 deg
tp 2458845.147255971084
(2019-Dec-27.64725597)
5.5234e-05 TDB
period 1168.924749718671
3.20
4.1919e-06
1.148e-08
d
yr
n .3079753423705353 1.1044e-09 deg/d
Q 2.485841173313318 5.943e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2485  
   data-arc span      40323 days (110.40 yr)  
   first obs. used      1910-03-09  
   last obs. used      2020-08-01  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41792  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:20:45  

Additional Information
 Earth MOID = .852181 au 
 Jupiter MOID = 2.72418 au 
 T_jup = 3.668 
[ 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 12.3   n/a MPO435701  
diameter diameter 8.257 km 0.073 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 131.1 h n/a LCDB (Rev. 2019-August); 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. (2019) Minor Planet Bull. 46-4, in press.]
geometric albedo albedo 0.252   0.025 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

722 Frieda (A911 UN)          Discovered 1911-Oct-18 by Palisa, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A911 UN = 1926 GR = 1946 SH 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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