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2975 Spahr (1970 AF1)
Classification: Main-belt Asteroid          SPK-ID: 2002975
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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09453962406625831 3.7608e-08  
a 2.248551402074419 7.3369e-09 au
q 2.035974197828645 8.5798e-08 au
i 6.897351660477347 3.9279e-06 deg
node 236.5786328558701 2.9735e-05 deg
peri 316.8012818251758 3.5771e-05 deg
M 278.9476722890739 2.2574e-05 deg
tp 2459277.778150048787
(2021-Mar-04.27815005)
7.7911e-05 TDB
period 1231.551725122231
3.37
6.0277e-06
1.65e-08
d
yr
n .2923141534832979 1.4307e-09 deg/d
Q 2.461128606320192 8.0305e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2228  
   data-arc span      22996 days (62.96 yr)  
   first obs. used      1957-04-30  
   last obs. used      2020-04-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44993  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:48:05  

Additional Information
 Earth MOID = 1.03982 au 
 Jupiter MOID = 2.51848 au 
 T_jup = 3.613 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456483.5 (2013-Jul-10.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .09473706603042986 3.7688e-08  
q 2.036014967446427 8.6035e-08 au
tp 2456814.720022228594
(2014-Jun-06.22002223)
7.2268e-05 TDB
node 236.6221755296592 2.9729e-05 deg
peri 316.6984977730389 3.572e-05 deg
i 6.897330598518066 3.9287e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2228  
   data-arc span      22996 days (62.96 yr)  
   first obs. used      1957-04-30  
   last obs. used      2020-04-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44993  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:48:05  

Additional Information
 Jupiter MOID = 2.51848 au 
 T_jup = 3.613 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.420374697035435E-15 -3.232913219822362E-15 -1.722694653919827E-13 1.040343137584082E-15 -2.713925399654489E-14 6.315209360645251E-16
q -3.232913219822362E-15 7.402034936843562E-15 5.762755075947625E-13 -2.436684580397553E-15 1.085386715695745E-13 -1.314096928836841E-15
tp -1.722694653919827E-13 5.762755075947625E-13 5.222659878844129E-9 -9.458442900497196E-13 1.441036431692195E-9 1.660648686714358E-12
node 1.040343137584082E-15 -2.436684580397553E-15 -9.458442900497196E-13 8.838038721505668E-10 -8.772886283068225E-10 -2.338797533366083E-11
peri -2.713925399654489E-14 1.085386715695745E-13 1.441036431692195E-9 -8.772886283068225E-10 1.275898514474349E-9 2.368037281234652E-11
i 6.315209360645251E-16 -1.314096928836841E-15 1.660648686714358E-12 -2.338797533366083E-11 2.368037281234652E-11 1.543448375702996E-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 13.1   n/a MPO502181  
diameter diameter 5.919 km 0.107 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 11.946 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.419   0.085 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

2975 Spahr (1970 AF1)          Discovered 1970-Jan-08 by Potter, H. and Lokalov, A. at Cerro El Roble
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1970 AF1 = 1957 HU = 1967 GH = 1970 AK1 = 1970 CB = 1978 PF4 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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