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JPL Small-Body Database Browser
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4242 Brecher (1981 FQ)
Classification: Main-belt Asteroid          SPK-ID: 2004242
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 28 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1486236068542093 3.7109e-08  
a 3.116314620591362 1.7351e-08 au
q 2.653156701586567 1.1956e-07 au
i .2830758379777808 4.4842e-06 deg
node 29.19493749395808 0.00079767 deg
peri 212.0503175402257 0.00079778 deg
M 280.751498971191 1.6963e-05 deg
tp 2459042.832579810578
(2020-Jul-12.33257981)
9.5823e-05 TDB
period 2009.372122684316
5.50
1.6782e-05
4.595e-08
d
yr
n .1791604431732021 1.4963e-09 deg/d
Q 3.579472539596157 1.993e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1976  
   data-arc span      24630 days (67.43 yr)  
   first obs. used      1951-12-01  
   last obs. used      2019-05-08  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49452  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 00:19:21  

Additional Information
 Earth MOID = 1.64043 au 
 Jupiter MOID = 1.4361 au 
 T_jup = 3.200 
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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 12.8   n/a MPO298992  
diameter diameter 14.112 km 0.143 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 7.68 h n/a LCDB (Rev. 2019-January); 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:
[Chang, C.-K.; Ip, W.-H.; Cheng, Y.-C.; Ngeow, C.-C.; et al. (2014) Astrophys. J. 788, A17.]
geometric albedo albedo 0.067   0.018 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4242 Brecher (1981 FQ)          Discovered 1981-Mar-28 by Harvard Observatory at Harvard
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1981 FQ = 1979 YA10 = 1987 KC1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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