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18307 (1981 ER10)
Classification: Main-belt Asteroid          SPK-ID: 2018307
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 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1509690815736097 3.7865e-08  
a 2.281195363995106 6.2965e-09 au
q 1.936805395002789 8.844e-08 au
i 2.235018004014045 2.5596e-06 deg
node 255.5042622028242 9.8892e-05 deg
peri 98.14579002360443 9.944e-05 deg
M 18.37240517053078 9.1961e-06 deg
tp 2459136.274771065669
(2020-Oct-13.77477107)
3.2179e-05 TDB
period 1258.46791433955
3.45
5.2104e-06
1.427e-08
d
yr
n .2860621203750988 1.1844e-09 deg/d
Q 2.625585332987424 7.2471e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2068  
   data-arc span      15619 days (42.76 yr)  
   first obs. used      1978-05-09  
   last obs. used      2021-02-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4634  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 02:26:19  

Additional Information
 Earth MOID = .931475 au 
 Jupiter MOID = 2.80557 au 
 T_jup = 3.589 
[ 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 14.79   n/a E2021B10  
diameter diameter 2.839 km 0.517 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
rotation period rot_per 60.792 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.321   0.255 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

18307 (1981 ER10)          Discovered 1981-Mar-01 by Bus, S. J. at Siding Spring
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1981 ER10 = 1996 TP49 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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