+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   58541 (1997 EA18) Classification: Main-belt Asteroid          SPK-ID: 2058541 [ 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 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1088779011761143 3.5706e-08   a 3.127423886320632 1.7168e-08 au q 2.786916537489995 1.0924e-07 au i 1.571406971458181 3.971e-06 deg node 22.43645754462206 0.00015041 deg peri 148.605723227521 0.00015159 deg M 71.70872760312839 1.8582e-05 deg tp 2458598.109178587757 (2019-Apr-24.60917859) 0.00010411 TDB period 2020.126427429283 5.53 1.6634e-05 4.554e-08 d yr n .1782066682124043 1.4674e-09 deg/d Q 3.467931235151269 1.9037e-08 au   Orbit Determination Parameters    # obs. used (total)      1119      data-arc span      8567 days (23.46 yr)      first obs. used      1997-03-03      last obs. used      2020-08-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .5486      source      ORB      producer      Otto Matic      solution date      2020-Nov-12 22:50:43   Additional Information  Earth MOID = 1.79278 au   Jupiter MOID = 1.49808 au   T_jup = 3.205  [ 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 14.3   n/a MPO436191   diameter diameter 7.384 km 0.464 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 7.69 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Chang, C.-K.; Ip, W.-H.; Cheng, Y.-C.; Ngeow, C.-C.; et al. (2014) Astrophys. J. 788, A17.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] geometric albedo albedo 0.036   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   58541 (1997 EA18)          Discovered 1997-Mar-03 by Endate, K., Watanabe, K. at Kitami Reference: 20030614/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1997 EA18 = 2000 TE18  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-20 18:12 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin