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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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1512563316843945 4.0343e-08  
a 2.281968152153033 8.862e-09 au
q 1.936806020437749 9.2559e-08 au
i 2.235101813479438 4.0021e-06 deg
node 255.5134385987854 0.00010393 deg
peri 98.10439254232088 0.00010487 deg
M 321.2052062786217 1.6972e-05 deg
tp 2459136.185594416145
(2020-Oct-13.68559442)
5.9788e-05 TDB
period 1259.107455000973
3.45
7.3346e-06
2.008e-08
d
yr
n .2859168203397874 1.6655e-09 deg/d
Q 2.627130283868317 1.0202e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1562  
   data-arc span      15379 days (42.11 yr)  
   first obs. used      1978-05-09  
   last obs. used      2020-06-16  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .50938  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Jun-23 18:20:36  

Additional Information
 Earth MOID = .933187 au 
 Jupiter MOID = 2.80375 au 
 T_jup = 3.588 
[ 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 14.7   n/a MPO337413  
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. 2019-August); 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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