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100784 (1998 FM61)
Classification: Main-belt Asteroid          SPK-ID: 2100784
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2105887987142092 3.3053e-08  
a 2.365827453329339 8.8453e-09 au
q 1.867610691967617 8.0751e-08 au
i 4.408178139323592 4.2587e-06 deg
node .3872796285952647 4.4427e-05 deg
peri 264.894017433146 4.5932e-05 deg
M 339.6287725243055 9.5869e-06 deg
tp 2459075.712101782866
(2020-Aug-14.21210178)
3.5311e-05 TDB
period 1329.14703712073
3.64
7.4541e-06
2.041e-08
d
yr
n .2708503949870372 1.519e-09 deg/d
Q 2.864044214691061 1.0708e-08 au
  Orbit Determination Parameters
   # obs. used (total)      977  
   data-arc span      8143 days (22.29 yr)  
   first obs. used      1998-03-02  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51592  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-24 01:13:27  

Additional Information
 Earth MOID = .858316 au 
 Jupiter MOID = 2.24482 au 
 T_jup = 3.514 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457124.5 (2015-Apr-12.0) TDB
Reference: JPL 18 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2111121459486639 3.3028e-08  
q 1.866116701174952 8.0731e-08 au
tp 2457745.403415346686
(2016-Dec-22.90341535)
3.7281e-05 TDB
node .4225065822781279 4.4443e-05 deg
peri 264.750797027374 4.5938e-05 deg
i 4.408590412953601 4.257e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      977  
   data-arc span      8143 days (22.29 yr)  
   first obs. used      1998-03-02  
   last obs. used      2020-06-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .51592  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-24 01:13:27  

Additional Information
 Jupiter MOID = 2.24482 au 
 T_jup = 3.514 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.090873031710219E-15 -2.657568051192635E-15 -2.557456152574064E-13 1.048694252130064E-14 -5.839070801099814E-14 -2.19852390505723E-15
q -2.657568051192635E-15 6.517521345612767E-15 5.085161996687219E-13 -2.442496512196401E-14 1.043939689818139E-13 5.518500334670035E-15
tp -2.557456152574064E-13 5.085161996687219E-13 1.389854346670376E-9 -1.590329695029198E-11 4.414580859202313E-10 9.730441379893977E-13
node 1.048694252130064E-14 -2.442496512196401E-14 -1.590329695029198E-11 1.97520766696198E-9 -1.973842264902946E-9 6.429739219798719E-11
peri -5.839070801099814E-14 1.043939689818139E-13 4.414580859202313E-10 -1.973842264902946E-9 2.110264339105662E-9 -6.389228591281872E-11
i -2.19852390505723E-15 5.518500334670035E-15 9.730441379893977E-13 6.429739219798719E-11 -6.389228591281872E-11 1.812171666906478E-11

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 15.7   n/a MPO366382  
diameter diameter 4.582 km 0.192 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.301 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.053   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

100784 (1998 FM61)          Discovered 1998-Mar-20 by LINEAR at Socorro
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

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Alternate Designations
 1998 FM61 = 1999 TR174 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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