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27708 (1987 WP)
Classification: Main-belt Asteroid          SPK-ID: 2027708
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2812789546298221 3.6366e-08  
a 2.400869300106839 1.0661e-08 au
q 1.725555293169955 8.9293e-08 au
i 21.07474448286591 4.1567e-06 deg
node 233.9980084043111 1.1163e-05 deg
peri 293.5209167097534 1.378e-05 deg
M 189.2036308100158 1.1625e-05 deg
tp 2459645.154973763053
(2022-Mar-06.65497376)
4.6325e-05 TDB
period 1358.786440574455
3.72
9.0507e-06
2.478e-08
d
yr
n .2649422964861222 1.7648e-09 deg/d
Q 3.076183307043723 1.366e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1961  
   data-arc span      12078 days (33.07 yr)  
   first obs. used      1987-10-23  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40771  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 20:53:36  

Additional Information
 Earth MOID = .825258 au 
 Jupiter MOID = 2.22469 au 
 T_jup = 3.384 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457298.5 (2015-Oct-03.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2807150255072272 3.6442e-08  
q 1.727622378229198 8.9459e-08 au
tp 2456926.209924067743
(2014-Sep-25.70992407)
3.837e-05 TDB
node 234.0382724447481 1.1159e-05 deg
peri 293.5151120850783 1.3773e-05 deg
i 21.07475917316556 4.1569e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      1961  
   data-arc span      12078 days (33.07 yr)  
   first obs. used      1987-10-23  
   last obs. used      2020-11-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40771  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-17 20:53:36  

Additional Information
 Jupiter MOID = 2.22469 au 
 T_jup = 3.384 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.327988644463308E-15 -3.248582631805131E-15 -1.641429450462857E-13 7.231237135180731E-15 -2.686568408436282E-14 3.02847990262497E-15
q -3.248582631805131E-15 8.00290742957137E-15 4.675799817376536E-13 -1.765957165299537E-14 8.28199668980496E-14 -6.546959485922086E-15
tp -1.641429450462857E-13 4.675799817376536E-13 1.472221804972227E-9 -1.862277040607932E-12 3.292191871598617E-10 3.600430131436054E-12
node 7.231237135180731E-15 -1.765957165299537E-14 -1.862277040607932E-12 1.245130546285888E-10 -1.159817489675501E-10 -4.953937120740317E-12
peri -2.686568408436282E-14 8.28199668980496E-14 3.292191871598617E-10 -1.159817489675501E-10 1.897069804731036E-10 5.480936091828771E-12
i 3.02847990262497E-15 -6.546959485922086E-15 3.600430131436054E-12 -4.953937120740317E-12 5.480936091828771E-12 1.727992801794017E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.1   n/a MPO395272  
diameter diameter 6.178 km 0.184 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.320   0.043 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

27708 (1987 WP)          Discovered 1987-Nov-20 by Alu, J., Helin, E. F. at Palomar
Reference: 20010902/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1987 WP = 1985 KF1 = 1998 VX 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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