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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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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 38 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1446094294818425 1.686e-08  
a 2.171897793668927 4.1538e-09 au
q 1.857820892833591 3.6889e-08 au
i 5.636766764066955 2.5159e-07 deg
node 45.6679701608899 1.6381e-06 deg
peri 257.2764030215838 5.0697e-06 deg
M 109.3942497551849 5.6622e-06 deg
tp 2458845.237394607258
(2019-Dec-27.73739461)
1.8246e-05 TDB
period 1169.115727998538
3.20
3.354e-06
9.183e-09
d
yr
n .3079250337486266 8.8338e-10 deg/d
Q 2.485974694504263 4.7545e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3110  
   data-arc span      40548 days (111.01 yr)  
   first obs. used      1910-03-09  
   last obs. used      2021-03-14  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39037  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:20:29  

Additional Information
 Earth MOID = .850577 au 
 Jupiter MOID = 2.7234 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 12.35   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

[ show close-approach data ]
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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