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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 ]

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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 40 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1445122845289593 1.6838e-08  
a 2.172202949875102 4.1555e-09 au
q 1.858292939128107 3.6845e-08 au
i 5.636339321881542 2.5157e-07 deg
node 45.66333721004732 1.6382e-06 deg
peri 257.3307109058887 5.076e-06 deg
M 169.6853918225371 5.6973e-06 deg
tp 2458845.323134826215
(2019-Dec-27.82313483)
1.8263e-05 TDB
period 1169.362131479656
3.20
3.3555e-06
9.187e-09
d
yr
n .3078601489723914 8.8341e-10 deg/d
Q 2.486112960622097 4.756e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3204  
   data-arc span      40607 days (111.18 yr)  
   first obs. used      1910-03-09  
   last obs. used      2021-05-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39607  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 11:28:37  

Additional Information
 Earth MOID = .852525 au 
 Jupiter MOID = 2.72231 au 
 T_jup = 3.668 
[ 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 12.35   n/a E2021B10  
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. 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. (2019) Minor Planet Bull. 46, 400-406.]
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

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