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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 ]

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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 47 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .030643282272609 1.7677e-08  
a 3.133588598420826 1.2234e-08 au
q 3.037565158473188 5.2369e-08 au
i 7.071909412653229 4.0363e-07 deg
node 287.9759614921096 5.3267e-06 deg
peri 240.3793233144311 2.1995e-05 deg
M 70.46564273448526 2.07e-05 deg
tp 2458999.914975038930
(2020-May-30.41497504)
0.00011631 TDB
period 2026.102415952482
5.55
1.1865e-05
3.248e-08
d
yr
n .1776810476931207 1.0405e-09 deg/d
Q 3.229612038368465 1.2608e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3339  
   data-arc span      33037 days (90.45 yr)  
   first obs. used      1931-01-13  
   last obs. used      2021-06-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .42276  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Jul-08 12:09:31  

Additional Information
 Earth MOID = 2.05357 au 
 Jupiter MOID = 1.81774 au 
 T_jup = 3.200 
[ show covariance matrix ]

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 10.62   n/a MPCxxxxx  
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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