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1215 Boyer (1932 BA)
Classification: Main-belt Asteroid          SPK-ID: 2001215
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1331550725225774 3.7237e-08  
a 2.577599923587727 9.0391e-09 au
q 2.234379418828213 9.7082e-08 au
i 15.91755680385237 3.1522e-06 deg
node 123.7287757873537 1.5316e-05 deg
peri 265.7484936360087 2.0449e-05 deg
M 203.3057053379562 1.6379e-05 deg
tp 2459658.418919230802
(2022-Mar-19.91891923)
7.0654e-05 TDB
period 1511.547127059895
4.14
7.951e-06
2.177e-08
d
yr
n .2381665735425893 1.2528e-09 deg/d
Q 2.920820428347241 1.0243e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2940  
   data-arc span      32397 days (88.70 yr)  
   first obs. used      1932-01-19  
   last obs. used      2020-09-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .3698  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:21:18  

Additional Information
 Earth MOID = 1.30405 au 
 Jupiter MOID = 2.58044 au 
 T_jup = 3.360 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457048.5 (2015-Jan-26.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1318343501049622 3.7248e-08  
q 2.239910204461629 9.7064e-08 au
tp 2456636.302589729166
(2013-Dec-09.80258973)
6.3919e-05 TDB
node 123.7611744198628 1.53e-05 deg
peri 266.2462382644035 2.0529e-05 deg
i 15.92036030249421 3.153e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2940  
   data-arc span      32397 days (88.70 yr)  
   first obs. used      1932-01-19  
   last obs. used      2020-09-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .3698  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:21:18  

Additional Information
 Jupiter MOID = 2.58044 au 
 T_jup = 3.360 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.387381350728127E-15 -3.603697820238117E-15 2.089241143893786E-13 8.472028522031113E-15 3.481473784830304E-14 2.689146061676282E-15
q -3.603697820238117E-15 9.421458395888146E-15 -3.635495333154824E-13 -2.26759443131196E-14 -4.99909594393477E-14 -6.550188930855857E-15
tp 2.089241143893786E-13 -3.635495333154824E-13 4.085631719672967E-9 -3.626031619123499E-12 9.011294768914629E-10 4.431711647562854E-12
node 8.472028522031113E-15 -2.26759443131196E-14 -3.626031619123499E-12 2.340999628789016E-10 -2.257466801231389E-10 -4.886234823255449E-12
peri 3.481473784830304E-14 -4.99909594393477E-14 9.011294768914629E-10 -2.257466801231389E-10 4.214256651508729E-10 5.663889786444543E-12
i 2.689146061676282E-15 -6.550188930855857E-15 4.431711647562854E-12 -4.886234823255449E-12 5.663889786444543E-12 9.941387289188104E-12

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 11.0   n/a MPO435707  
diameter diameter 13.041 km 0.106 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 10.36 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Kim, M.-J.; Choi, Y.-J.; Moon, H.-K.; Byun, Y.-I.; et al. (2014) Astron. J. 147, A56.]
geometric albedo albedo 0.116   0.022 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.900   0.066 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=11.32, mean=18.04, max.=24.76) deg.
U-B UB 0.459   0.040 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=24.76 deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices; used ground-based radiometric albedo

1215 Boyer (1932 BA)          Discovered 1932-Jan-19 by Schmitt, A. at Algiers
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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