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18042 (1999 RF27)
Classification: Main-belt Asteroid          SPK-ID: 2018042
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 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2506086849523347 3.4525e-08  
a 2.610960845950075 1.1493e-08 au
q 1.956631381884491 8.7264e-08 au
i 8.038097869873024 4.6799e-06 deg
node 140.4368830875673 2.6721e-05 deg
peri 71.20861618080073 2.8552e-05 deg
M 114.6505029288647 1.126e-05 deg
tp 2458509.736303432330
(2019-Jan-26.23630343)
4.6441e-05 TDB
period 1540.986966921372
4.22
1.0175e-05
2.786e-08
d
yr
n .2336165118380062 1.5426e-09 deg/d
Q 3.265290310015659 1.4374e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1674  
   data-arc span      25383 days (69.49 yr)  
   first obs. used      1951-02-04  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5049  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 01:17:24  

Additional Information
 Earth MOID = .96932 au 
 Jupiter MOID = 1.75267 au 
 T_jup = 3.351 
[ 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 13.4   n/a MPO439218  
diameter diameter 7.556 km 2.455 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
rotation period rot_per 7.2998 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.135   0.083 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  

18042 (1999 RF27)          Discovered 1999-Sep-07 by LINEAR at Socorro
Reference: 20001013/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1999 RF27 = 1989 ET11 = 1998 MR26 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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