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4104 Alu (1989 ED)
Classification: Main-belt Asteroid          SPK-ID: 2004104
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 46 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1057047888797934 1.4437e-08  
a 2.543758783144192 9.4467e-09 au
q 2.274871298010815 3.819e-08 au
i 15.6990394721236 5.318e-07 deg
node 52.05426337035984 3.1549e-06 deg
peri 242.5070815548536 1.0165e-05 deg
M 181.0522367372927 9.6915e-06 deg
tp 2459937.107420572893
(2022-Dec-23.60742057)
4.2114e-05 TDB
period 1481.877541084106
4.06
8.2548e-06
2.26e-08
d
yr
n .2429350536864421 1.3533e-09 deg/d
Q 2.812646268277568 1.0445e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2884  
   data-arc span      24790 days (67.87 yr)  
   first obs. used      1953-05-07  
   last obs. used      2021-03-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37587  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:24:19  

Additional Information
 Earth MOID = 1.30025 au 
 Jupiter MOID = 2.35361 au 
 T_jup = 3.384 
[ 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 12.51   n/a MPCxxxxx  
diameter diameter 8.595 km 0.223 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 6. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 lower-limit; Incomplete or inconclusive result.
Published Reference List:
[Kim, M.-J.; Choi, Y.-J.; Moon, H.-K.; Byun, Y.-I.; et al. (2014) Astron. J. 147, A56.]
geometric albedo albedo 0.239   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

4104 Alu (1989 ED)          Discovered 1989-Mar-05 by Helin, E. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1989 ED = 1953 JC = 1957 KK = 1977 FO3 = 1987 YR3 = 1988 AG2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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