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'Oumuamua (A/2017 U1)
Classification: Hyperbolic Asteroid          SPK-ID: 3788040
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | 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 2458080.5 (2017-Nov-23.0) TDB
Reference: JPL 16 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e 1.201133796102373 2.1064e-05  
a -1.27234500742808 0.00010015 au
q .2559115812959116 6.6635e-06 au
i 122.7417062847286 0.00028826 deg
node 24.59690955523242 0.00025422 deg
peri 241.8105360304898 0.0012495 deg
M 51.1576197938249 0.0061155 deg
tp 2458006.007321375231
0.00026424 TDB
period n/a
n .6867469493413392 8.1084e-05 deg/d
Q n/a n/a au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A1 [EST] 2.790193364334668E-7 3.574E-8
A2 [EST] 1.441264159911234E-8 2.445E-8
A3 [EST] 1.57392261588653E-8 2.249E-8
ALN [SET] .0408373333128795 n/a
NK [SET] 2.6 n/a
NM [SET] 2. n/a
NN [SET] 3. n/a
R0 [SET] 5. n/a
  Orbit Determination Parameters
   # obs. used (total)      207  
   data-arc span      80 days  
   first obs. used      2017-10-14  
   last obs. used      2018-01-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   norm. resid. RMS      .43612  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2018-Jun-26 12:17:57  

Additional Information
 Earth MOID = .0958212 au 
 Jupiter MOID = 1.45424 au 
 Sol. 7c, Micheli et al. 2018 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 22.08   .44525 2 autocmod 2.6k
rotation period rot_per 7.937 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:
[Bannister, M.T.; Schwamb, M.E.; Fraser, W.C.; Marsset, M.; et al. (2017) Astrophys. J. Letters, submitted. ArXiv1711.06214v1.]
[Bolin, B.T.; Weaver, H.A.; Fernandez, Y.R.; Lisse, C.M.; et al. (2017). ArXiv:1711.04927v1.]
[Drahus, M.; Guzik, P.; Waniak, W.; Handzlik, B.; et al. (2017) ArXiv:171200437]
[Fraser, W.C.; Pravec, P.; Fitzsimmons, A.; Lacerda, P.; et al. (2017) ArXiv:1711.11530]
[Jewitt, D.; Luu, J.; Rajagopal, J.; Kotulla, R.; et al. (2017) Astrophys. J. Letters, submitted. ArXiv:1711.05687v1.]

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2017-Oct-14 17:51 < 00:01 Earth 0.161754108720985 0.161740973464741 0.161767243979224 60.2591250804612 60.2588517203144 2458041.243487708 0.0291420952761664 655.614715604245 15.5207706941065 -2.49059586211829 73651.4139912346 T 16 CATAB v2.0e-lin.ifort 2018-Jun-27 10:12:02 2018-Jun-27 10:12
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]
FirstGov 2020-Dec-05 15:29 UT
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