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249161 (2008 BF21)
Classification: Main-belt Asteroid          SPK-ID: 2249161
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1504952523920313 7.4542e-08  
a 3.024810918707838 4.8504e-08 au
q 2.56959123605873 2.3254e-07 au
i 13.29308405080771 9.3239e-06 deg
node 328.8827617081513 2.7523e-05 deg
peri 67.82617331331197 4.3322e-05 deg
M 147.4739341278145 3.1764e-05 deg
tp 2457813.348114386890
(2017-Feb-28.84811439)
0.00016324 TDB
period 1921.523830612133
5.26
4.6219e-05
1.265e-07
d
yr
n .1873513064291876 4.5064e-09 deg/d
Q 3.480030601356947 5.5804e-08 au
  Orbit Determination Parameters
   # obs. used (total)      222  
   data-arc span      6815 days (18.66 yr)  
   first obs. used      2000-08-28  
   last obs. used      2019-04-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53517  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-14 10:52:16  

Additional Information
 Earth MOID = 1.60935 au 
 Jupiter MOID = 2.14227 au 
 T_jup = 3.187 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457697.5 (2016-Nov-05.0) TDB
Reference: JPL 9 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1508755576859303 7.435e-08  
q 2.569890010858698 2.32e-07 au
tp 2457814.324997126901
(2017-Mar-01.82499713)
0.00016316 TDB
node 328.8947760683152 2.7523e-05 deg
peri 68.02341696379133 4.3286e-05 deg
i 13.29150112438632 9.3231e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      222  
   data-arc span      6815 days (18.66 yr)  
   first obs. used      2000-08-28  
   last obs. used      2019-04-26  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .53517  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jul-14 10:52:16  

Additional Information
 Jupiter MOID = 2.14227 au 
 T_jup = 3.187 
Orbit Covariance (6×6)
  e q tp node peri i
e 5.527952450779481E-15 -1.697594387496574E-14 -6.225611902808887E-12 -1.17464575424063E-14 -1.405780491526329E-12 1.039481300235583E-14
q -1.697594387496574E-14 5.382548908341928E-14 2.069584803898959E-11 3.626307648635284E-14 4.592083727855711E-12 -2.999360332915095E-14
tp -6.225611902808887E-12 2.069584803898959E-11 2.662122691692336E-8 -6.041768712560109E-11 5.479140235822779E-9 -4.18088169973314E-11
node -1.17464575424063E-14 3.626307648635284E-14 -6.041768712560109E-11 7.57522665597962E-10 -7.472084134577189E-10 5.551221492446054E-11
peri -1.405780491526329E-12 4.592083727855711E-12 5.479140235822779E-9 -7.472084134577189E-10 1.873702978910937E-9 -6.258214074223993E-11
i 1.039481300235583E-14 -2.999360332915095E-14 -4.18088169973314E-11 5.551221492446054E-11 -6.258214074223993E-11 8.691981266646795E-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 15.5   n/a MPO470658  
diameter diameter 4.605 km 0.897 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.053   0.017 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

249161 (2008 BF21)          Discovered 2008-Jan-30 by Mt. Lemmon Survey at Mount Lemmon
Reference: 20100824/Numbers.arcLast Updated: 2010-08-27

[ show close-approach data ]
Alternate Designations
 2008 BF21 = 2000 QR248 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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