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1389 Onnie (1935 SS1)
Classification: Main-belt Asteroid          SPK-ID: 2001389
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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .01551313193160298 2.0778e-08  
a 2.864598596544051 9.2321e-09 au
q 2.820159700584779 5.7447e-08 au
i 2.048458219235951 1.167e-06 deg
node 174.5560808663669 2.6104e-05 deg
peri 294.5008622372377 4.6991e-05 deg
M 110.7350033264263 4.3551e-05 deg
tp 2458655.775998648642
(2019-Jun-21.27599865)
0.00021398 TDB
period 1770.900208567479
4.85
8.561e-06
2.344e-08
d
yr
n .2032864405675417 9.8274e-10 deg/d
Q 2.909037492503324 9.3754e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3651  
   data-arc span      31198 days (85.42 yr)  
   first obs. used      1935-09-28  
   last obs. used      2021-02-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4272  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:22:47  

Additional Information
 Earth MOID = 1.83743 au 
 Jupiter MOID = 2.08173 au 
 T_jup = 3.299 
[ 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 11.60   n/a E2021B10  
diameter diameter 13.772 km 0.184 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 22.5 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:
[Binzel, R.P. (1987) Icarus 72, 135-208.]
[Hanus, J.; Durech, J.; Broz, M.; Warner, B.D.; et al. (2011) Astron. Astrophys. 530, A134.]
[Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.]
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.198   0.016 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.810   0.030 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=4.40 deg.

1389 Onnie (1935 SS1)          Discovered 1935-Sep-28 by Van Gent, H. at Johannesburg (LS)
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1935 SS1 = 1949 QV1 = 1955 XB1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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