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9177 Donsaari (1990 YA)
Classification: Main-belt Asteroid          SPK-ID: 2009177
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2786081031545231 4.5152e-08  
a 2.56019429888803 9.3574e-09 au
q 1.846903421567812 1.1127e-07 au
i 4.426104972922305 4.6605e-06 deg
node 261.6964747494283 5.3831e-05 deg
peri 129.3173440081282 5.4871e-05 deg
M 78.5228013674888 1.1415e-05 deg
tp 2458674.136861921309
(2019-Jul-09.63686192)
4.6716e-05 TDB
period 1496.262584398499
4.10
8.2032e-06
2.246e-08
d
yr
n .2405994801672602 1.3191e-09 deg/d
Q 3.273485176208248 1.1964e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1776  
   data-arc span      24329 days (66.61 yr)  
   first obs. used      1953-09-16  
   last obs. used      2020-04-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5395  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 03:08:14  

Additional Information
 Earth MOID = .856638 au 
 Jupiter MOID = 2.19312 au 
 T_jup = 3.376 
[ 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 13.7   n/a MPO358719  
diameter diameter 5.574 km 0.209 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.206   0.054 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

9177 Donsaari           Discovered 1990 Dec. 18 by E. F. Helin at Palomar.
Donald Gene Saari (b. 1940) is an American mathematician who has worked at the University of California, Irvine, and at Northwestern University. Don has made fundamental contributions to the n-body problem of celestial mechanics, voting theory, and the application of mathematics to the social sciences.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC batch dated 2020-02-05Last Updated: 2020-02-24

Alternate Designations
 1990 YA = 1986 WL10 = 1990 VN8 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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