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48399 (1981 EA21)
Classification: Main-belt Asteroid          SPK-ID: 2048399
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04220216548717292 3.8136e-08  
a 2.808698455512781 1.4751e-08 au
q 2.690165298489664 1.0608e-07 au
i .8195950264916148 3.7341e-06 deg
node 314.7511645770579 0.00030361 deg
peri 219.2014677301078 0.00030728 deg
M 124.2756280771224 4.6355e-05 deg
tp 2458406.974249336397
(2018-Oct-15.47424934)
0.00022195 TDB
period 1719.317564875225
4.71
1.3545e-05
3.708e-08
d
yr
n .2093854022983393 1.6495e-09 deg/d
Q 2.927231612535899 1.5374e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1002  
   data-arc span      14020 days (38.38 yr)  
   first obs. used      1981-02-09  
   last obs. used      2019-06-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .54033  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-23 09:05:57  

Additional Information
 Earth MOID = 1.69445 au 
 Jupiter MOID = 2.03596 au 
 T_jup = 3.321 
[ 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 14.9   n/a MPO257193  

48399 (1981 EA21)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1902-Mar-26 15:06 00:06 Iris 0.0329371239377203 0.0329252517786575 0.0329489973535869 3.80927034302729 3.80927029720829 2415835.129065500 6.28078345438816 673.483185873792 50.7991343321852 -28.626837792382 46883.0450998648 T 20 CATAB v2.0f-lin.ifort 2020-Feb-23 09:06:13 2020-Feb-23 09:06
1972-Nov-14 04:25 00:07 Hygie 0.0481564481973892 0.0481523377378879 0.0481605587132826 1.40754848780612 1.40754791779319 2441635.683783839 7.1752345091667 218.612665035563 29.1495908105536 -22.4058592669321 97610.2778300538 T 20 CATAB v2.0f-lin.ifort 2020-Feb-23 09:06:13 2020-Feb-23 09:06
1976-Aug-15 10:28 00:02 Amphi 0.0382596223208188 0.0382572829108159 0.0382619622243693 2.04055317609635 2.04055310246132 2443005.936241559 2.07294472626004 254.122248214354 33.6842856495691 63.7474602174284 152417.008493823 T 20 CATAB v2.0f-lin.ifort 2020-Feb-23 09:06:13 2020-Feb-23 09:06
2184-Jun-12 15:24 00:32 Hygie 0.046206574984345 0.0461868936125787 0.0462262593867616 1.49113908846219 1.49113852769761 2518913.141423178 32.3753131125643 1134.71938125058 33.9938583411032 -31.1215725336507 103903.641520438 T 20 CATAB v2.0f-lin.ifort 2020-Feb-23 09:06:13 2020-Feb-23 09:06

Alternate Designations
 1981 EA21 = 2000 GQ29 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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