+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3554 Amun (1986 EB) Classification: Aten [NEO]          SPK-ID: 2003554 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] 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. 2020-October); 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, 458-503.] 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.DB Last Updated: 2003-08-29 [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-02 04:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin