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172717 (2004 BS81)
Classification: Main-belt Asteroid          SPK-ID: 2172717
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06213435650029003 4.3409e-08  
a 2.742687922039674 2.3004e-08 au
q 2.572272772922621 1.2636e-07 au
i 7.20441785948571 5.2111e-06 deg
node 81.53293365689987 3.8148e-05 deg
peri 282.5607249081443 5.8528e-05 deg
M 328.5568405094498 4.4585e-05 deg
tp 2459145.406109251312
(2020-Oct-22.90610925)
0.0002059 TDB
period 1659.063534825438
4.54
2.0873e-05
5.715e-08
d
yr
n .2169898816068417 2.73e-09 deg/d
Q 2.913103071156728 2.4433e-08 au
  Orbit Determination Parameters
   # obs. used (total)      437  
   data-arc span      6538 days (17.90 yr)  
   first obs. used      2002-09-05  
   last obs. used      2020-07-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58509  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 13:01:55  

Additional Information
 Earth MOID = 1.58239 au 
 Jupiter MOID = 2.38814 au 
 T_jup = 3.335 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457300.5 (2015-Oct-05.0) TDB
Reference: JPL 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06460129449097896 4.343e-08  
q 2.565581198603422 1.2668e-07 au
tp 2457487.715025810848
(2016-Apr-09.21502581)
0.00019376 TDB
node 81.5615207514512 3.8153e-05 deg
peri 282.968312922001 5.7195e-05 deg
i 7.2052539652692 5.2087e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      437  
   data-arc span      6538 days (17.90 yr)  
   first obs. used      2002-09-05  
   last obs. used      2020-07-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .58509  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-25 13:01:55  

Additional Information
 Jupiter MOID = 2.38814 au 
 T_jup = 3.335 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.886152472261534E-15 -5.428948637243701E-15 -1.015323089317928E-12 4.872976865458335E-15 -1.761843368242086E-13 -6.148043602874196E-16
q -5.428948637243701E-15 1.604810018394172E-14 3.344451266522709E-12 -1.58198717062936E-14 5.852504741097517E-13 2.185395815230894E-15
tp -1.015323089317928E-12 3.344451266522709E-12 3.754273724860402E-8 -8.440566640497499E-11 8.278113803603814E-9 4.599687682005975E-12
node 4.872976865458335E-15 -1.58198717062936E-14 -8.440566640497499E-11 1.455639064004381E-9 -1.461970032487647E-9 3.486545805180493E-11
peri -1.761843368242086E-13 5.852504741097517E-13 8.278113803603814E-9 -1.461970032487647E-9 3.271248092446722E-9 -3.36061664154516E-11
i -6.148043602874196E-16 2.185395815230894E-15 4.599687682005975E-12 3.486545805180493E-11 -3.36061664154516E-11 2.713032492026752E-11

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 15.6   n/a MPO436858  

172717 (2004 BS81)          Discovered 2004-Jan-26 by LONEOS at Anderson Mesa
Reference: 20071224/Numbers.arcLast Updated: 2007-12-22

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Alternate Designations
 2004 BS81 = 2005 HK2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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