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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03081716803981653 1.7666e-08  
a 3.134082790185361 1.2608e-08 au
q 3.037499234189522 5.2357e-08 au
i 7.071800910646573 4.0459e-07 deg
node 287.9778788739351 5.3397e-06 deg
peri 240.4960398174645 2.1928e-05 deg
M 35.51379781346215 2.0632e-05 deg
tp 2459000.578850180840
(2020-May-31.07885018)
0.00011604 TDB
period 2026.581733469676
5.55
1.2229e-05
3.348e-08
d
yr
n .1776390234129122 1.0719e-09 deg/d
Q 3.2306663461812 1.2996e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3194  
   data-arc span      32925 days (90.14 yr)  
   first obs. used      1931-01-13  
   last obs. used      2021-03-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43098  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:12:14  

Additional Information
 Earth MOID = 2.05235 au 
 Jupiter MOID = 1.81741 au 
 T_jup = 3.200 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456617.5 (2013-Nov-21.0) TDB
Reference: JPL 44 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .03456308593607682 1.7714e-08  
q 3.031528010271382 5.3191e-08 au
tp 2456966.389236314680
(2014-Nov-04.88923631)
0.00010012 TDB
node 288.029671601324 5.3318e-06 deg
peri 239.3456747025404 1.92e-05 deg
i 7.074093134355986 4.0365e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3194  
   data-arc span      32925 days (90.14 yr)  
   first obs. used      1931-01-13  
   last obs. used      2021-03-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43098  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:12:14  

Additional Information
 Jupiter MOID = 1.81741 au 
 T_jup = 3.200 
Orbit Covariance (6×6)
  e q tp node peri i
e 3.137761455199105E-16 -9.198584436871775E-16 -9.648254322779678E-13 -1.487623948145701E-14 -1.812495712690549E-13 1.482397511469846E-15
q -9.198584436871775E-16 2.829287810546378E-15 3.062207889830586E-12 4.364384052603128E-14 5.770836601686835E-13 -4.594690763354443E-15
tp -9.648254322779678E-13 3.062207889830586E-12 1.002323752945659E-8 4.976059161589182E-11 1.852295415753043E-9 5.698170591823001E-12
node -1.487623948145701E-14 4.364384052603128E-14 4.976059161589182E-11 2.842848531805142E-11 -1.746638136346258E-11 1.54928758219775E-12
peri -1.812495712690549E-13 5.770836601686835E-13 1.852295415753043E-9 -1.746638136346258E-11 3.686360572859302E-10 -6.24000209315244E-13
i 1.482397511469846E-15 -4.594690763354443E-15 5.698170591823001E-12 1.54928758219775E-12 -6.24000209315244E-13 1.629347188912822E-13

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 10.63   n/a E2021B10  
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. 2020-October); 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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