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1254 Erfordia (1932 JA)
Classification: Main-belt Asteroid          SPK-ID: 2001254
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 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03105255999266025 3.6324e-08  
a 3.134866533571504 1.3218e-08 au
q 3.037520902468792 1.1479e-07 au
i 7.07184962299455 3.5765e-06 deg
node 287.9800055854083 2.9436e-05 deg
peri 240.6143855606274 6.221e-05 deg
M 359.8710637613308 5.4287e-05 deg
tp 2459001.226105131892
(2020-May-31.72610513)
0.00030571 TDB
period 2027.34196513736
5.55
1.2822e-05
3.51e-08
d
yr
n .1775724106690647 1.123e-09 deg/d
Q 3.232212164674216 1.3628e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3062  
   data-arc span      32658 days (89.41 yr)  
   first obs. used      1931-01-13  
   last obs. used      2020-06-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .435  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:28:39  

Additional Information
 Earth MOID = 2.0527 au 
 Jupiter MOID = 1.81685 au 
 T_jup = 3.200 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456483.5 (2013-Jul-10.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03517748645934989 3.598e-08  
q 3.02844121474743 1.1504e-07 au
tp 2456970.977713039162
(2014-Nov-09.47771304)
0.00027279 TDB
node 288.0384700956974 2.9429e-05 deg
peri 240.2755260045496 5.6863e-05 deg
i 7.071151269061689 3.5738e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3062  
   data-arc span      32658 days (89.41 yr)  
   first obs. used      1931-01-13  
   last obs. used      2020-06-12  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .435  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 15:28:39  

Additional Information
 Jupiter MOID = 1.81685 au 
 T_jup = 3.200 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.294596192839758E-15 -4.113918490341569E-15 -3.416541673395156E-13 1.857111131889944E-15 -2.647020227037796E-14 9.856595649976789E-17
q -4.113918490341569E-15 1.323420378349154E-14 7.321202719579972E-13 -8.290072390892244E-15 1.659077905063116E-14 -6.173097484430207E-16
tp -3.416541673395156E-13 7.321202719579972E-13 7.441197921733179E-8 -4.377026257932789E-12 1.328666581955703E-8 4.067595022651308E-12
node 1.857111131889944E-15 -8.290072390892244E-15 -4.377026257932789E-12 8.660418364276885E-10 -8.603181060592403E-10 1.507112258592642E-11
peri -2.647020227037796E-14 1.659077905063116E-14 1.328666581955703E-8 -8.603181060592403E-10 3.23338823659072E-9 -1.426198843089169E-11
i 9.856595649976789E-17 -6.173097484430207E-16 4.067595022651308E-12 1.507112258592642E-11 -1.426198843089169E-11 1.277200780802456E-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 10.5   n/a MPO296136  
diameter diameter 51.540 km 0.112 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 12.287 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Brinsfield, J.W. (2009) Minor Planet Bull. 36, 127-128.]
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.032   0.011 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1254 Erfordia (1932 JA)          Discovered 1932-May-10 by Hartmann, J. at La Plata
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1932 JA = 1931 BE = 1971 KG = 1974 XR 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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