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8641 (1987 BM1)
Classification: Main-belt Asteroid          SPK-ID: 2008641
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1099812510587793 1.8013e-08  
a 3.015277240976164 1.5763e-08 au
q 2.683653277724541 5.4526e-08 au
i 14.46560701611364 9.035e-07 deg
node 93.01954640496724 2.6577e-06 deg
peri 50.10453845409616 8.8871e-06 deg
M 173.4675240501154 1.0874e-05 deg
tp 2458278.979543541013
(2018-Jun-09.47954354)
5.4651e-05 TDB
period 1912.446529353772
5.24
1.4997e-05
4.106e-08
d
yr
n .1882405570427353 1.4761e-09 deg/d
Q 3.346901204227787 1.7497e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1950  
   data-arc span      12339 days (33.78 yr)  
   first obs. used      1987-01-27  
   last obs. used      2020-11-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45132  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 20:46:14  

Additional Information
 Earth MOID = 1.72229 au 
 Jupiter MOID = 1.83653 au 
 T_jup = 3.191 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457063.5 (2015-Feb-10.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1088682061145986 1.7793e-08  
q 2.683976698312645 5.3614e-08 au
tp 2456357.460802288121
(2013-Mar-05.96080229)
5.206e-05 TDB
node 93.09880035271473 2.6512e-06 deg
peri 47.88775754045011 9.0909e-06 deg
i 14.48964811750132 9.0184e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      1950  
   data-arc span      12339 days (33.78 yr)  
   first obs. used      1987-01-27  
   last obs. used      2020-11-08  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .45132  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 20:46:14  

Additional Information
 Jupiter MOID = 1.83653 au 
 T_jup = 3.191 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.165828610632436E-16 -9.242727856072253E-16 1.790130702642085E-13 1.319983839176364E-15 2.16706644311044E-14 -4.478833298937937E-16
q -9.242727856072253E-16 2.874504452967391E-15 -4.417870354831955E-13 -4.535636913070815E-15 -3.682028766753826E-14 8.421728613733734E-16
tp 1.790130702642085E-13 -4.417870354831955E-13 2.710258649262814E-9 -2.531647019924429E-11 4.510683640609797E-10 -9.584037840577042E-12
node 1.319983839176364E-15 -4.535636913070815E-15 -2.531647019924429E-11 7.028632598507118E-12 -1.070040525440906E-11 1.916415027644438E-12
peri 2.16706644311044E-14 -3.682028766753826E-14 4.510683640609797E-10 -1.070040525440906E-11 8.264369220082395E-11 -3.370949036699992E-12
i -4.478833298937937E-16 8.421728613733734E-16 -9.584037840577042E-12 1.916415027644438E-12 -3.370949036699992E-12 8.133108848298041E-13

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 13.02   n/a E2021B10  
diameter diameter 13.633 km 0.317 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.079   0.012 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

8641 (1987 BM1)          Discovered 1987-Jan-27 by Jensen, P. at Brorfelde
Reference: 19980511/Numbers.arcLast Updated: 2004-04-19

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Alternate Designations
 1987 BM1 = 1990 VT9 = 1996 YE3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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