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3545 Gaffey (1981 WK2)
Classification: Main-belt Asteroid          SPK-ID: 2003545
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 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05730090164059612 3.9355e-08  
a 2.871603936905951 1.4067e-08 au
q 2.707058442166555 1.1355e-07 au
i 2.972880377973177 4.4759e-06 deg
node 61.27012253010709 9.1923e-05 deg
peri 254.7563117798845 0.0001018 deg
M 315.3805428145411 4.3882e-05 deg
tp 2458820.796206573943
(2019-Dec-03.29620657)
0.00021691 TDB
period 1777.400250231304
4.87
1.3061e-05
3.576e-08
d
yr
n .2025430118810611 1.4883e-09 deg/d
Q 3.036149431645348 1.4873e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2103  
   data-arc span      17993 days (49.26 yr)  
   first obs. used      1970-05-14  
   last obs. used      2019-08-18  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .49079  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-23 19:32:09  

Additional Information
 Earth MOID = 1.69442 au 
 Jupiter MOID = 2.12555 au 
 T_jup = 3.293 
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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 12.2   n/a MPO347549  
diameter diameter 12.435 km 0.392 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.165   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
SMASSII spectral type spec_B Sa   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

3545 Gaffey (1981 WK2)          Discovered 1981-Nov-20 by Bowell, E. at Flagstaff (AM)
Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1981 WK2 = 1970 JJ = 1970 LN = 1972 XG2 = 1976 SB11 = 1979 FW1 = 1981 SO1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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