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30749 (1981 ER26)
Classification: Main-belt Asteroid          SPK-ID: 2030749
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 29 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05125080862766861 4.0258e-08  
a 2.356527071964826 1.0018e-08 au
q 2.235753153973636 9.4403e-08 au
i 7.340771362930769 4.6229e-06 deg
node 5.059845726728419 3.1368e-05 deg
peri 209.0610646073288 5.3501e-05 deg
M 324.2435255099484 4.3808e-05 deg
tp 2459331.737898620861
(2021-Apr-27.23789862)
0.0001608 TDB
period 1321.317164997768
3.62
8.4256e-06
2.307e-08
d
yr
n .2724554024851468 1.7374e-09 deg/d
Q 2.477300989956015 1.0531e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1337  
   data-arc span      14651 days (40.11 yr)  
   first obs. used      1981-02-09  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .52436  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 04:31:22  

Additional Information
 Earth MOID = 1.23228 au 
 Jupiter MOID = 2.48867 au 
 T_jup = 3.541 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.14   n/a E2021B10  
diameter diameter 2.183 km 0.389 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 91.9974 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]
geometric albedo albedo 0.445   0.214 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

30749 (1981 ER26)          Discovered 1981-Mar-02 by Bus, S. J. at Siding Spring
Reference: 20011130/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 ER26 = 1999 FA21 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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