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JPL Small-Body Database Browser
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3554 Amun (1986 EB)
Classification: Aten [NEO]          SPK-ID: 2003554
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 260 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .280576760744493 7.6611e-08  
a .9739454856228307 2.6402e-09 au
q .7006790161250547 7.5843e-08 au
i 23.35695516099013 1.0335e-05 deg
node 358.6102876226886 7.37e-06 deg
peri 359.4009549855169 1.7155e-05 deg
M 26.0368830535026 2.5155e-05 deg
tp 2458975.108585689241
(2020-May-05.60858569)		 2.4531e-05 TDB
period 351.0754007340228
0.96		 1.4275e-06
3.908e-09		 d
yr
n 1.025420747928558 4.1696e-09 deg/d
Q 1.247211955120607 3.3809e-09 au
   Orbit Determination Parameters
   # obs. used (total)      1657  
   data-arc span      11979 days (32.80 yr)  
   first obs. used      1986-03-04  
   last obs. used      2018-12-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .34744  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Dec-22 06:54:50  

Additional Information
 Earth MOID = .250657 au 
 Jupiter MOID = 4.19669 au 
 T_jup = 6.105 
[ 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 15.82   n/a MPO263378  
diameter diameter 3.341 km 0.021 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
rotation period rot_per 2.53001 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Wisniewski, W.Z.; Michalowski, T.M.; Harris, A.W.; McMillan, R.S. (1997) Icarus 126, 395-449; 1995, Lunar & Planetary Sci. XXVI, 1511-1512.]
[Behrend, R. (2009) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Skiff, B.A. (2011) Posting on CALL web site. http://www.minorplanet.info/call.html]
[Koehn, B.W.; Bowell, E.L.G.; Skiff, B.A.; Sanborn, J.J.; et al. (2014) Minor Planet Bull. 41, 286-300.]
[Skiff, B.A.; McLelland, K.P.; Sanborn, J.; Pravec, P.; Koehn, B.W. (2019). Minor Planet Bull. 46-4, in press.]
geometric albedo albedo 0.074   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[neos] (http://adsabs.harvard.edu/abs/2011ApJ...743..156M)  
B-V BV 0.707   0.021 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=21.02, mean=29.90, max.=38.78) deg.
U-B UB 0.235   0.054 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=21.02, mean=29.90, max.=38.78) deg.

3554 Amun (1986 EB)          Discovered 1986-Mar-04 by Shoemaker, C. and Shoemaker, E. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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