+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   17471 (1991 EO2) Classification: Main-belt Asteroid          SPK-ID: 2017471 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1569071619678887 3.6835e-08   a 2.418778614586074 6.7111e-09 au q 2.039254926742752 8.997e-08 au i 1.719791675173694 3.6829e-06 deg node 316.3829014474604 0.0001164 deg peri 219.3476507874427 0.00011683 deg M 321.8588574552273 1.0432e-05 deg tp 2459346.073996447382 (2021-May-11.57399645) 3.9943e-05 TDB period 1374.01858529904 3.76 5.7185e-06 1.566e-08 d yr n .2620051896326061 1.0904e-09 deg/d Q 2.798302302429397 7.7641e-09 au   Orbit Determination Parameters    # obs. used (total)      1771      data-arc span      10962 days (30.01 yr)      first obs. used      1991-03-11      last obs. used      2021-03-15      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .4955      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:04:02   Additional Information  Earth MOID = 1.04369 au   Jupiter MOID = 2.16835 au   T_jup = 3.497  [ 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 14.43   n/a E2021B10   diameter diameter 3.831 km 0.128 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.251   0.028 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   17471 (1991 EO2)          Discovered 1991-Mar-11 by Debehogne, H. at La Silla Reference: 20001013/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1991 EO2 = 1992 OY1 = 1997 WT42  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-18 00:40 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin