+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15510 Phoeberounds (1999 TF127) Classification: Main-belt Asteroid          SPK-ID: 2015510 [ 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 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09113386072664763 2.5131e-08   a 2.427712366253793 7.7892e-09 au q 2.20646556558326 6.1259e-08 au i 2.494033036418903 4.3139e-06 deg node 156.0598287161778 7.4804e-05 deg peri 312.5293311852963 8.0699e-05 deg M 138.1028712950655 2.8653e-05 deg tp 2458670.477287961840 (2019-Jul-05.97728796) 0.00010992 TDB period 1381.638010451381 3.78 6.6494e-06 1.821e-08 d yr n .2605602895091082 1.254e-09 deg/d Q 2.648959166924326 8.4991e-09 au   Orbit Determination Parameters    # obs. used (total)      1359      data-arc span      10053 days (27.52 yr)      first obs. used      1992-12-30      last obs. used      2020-07-09      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .50438      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 01:00:27   Additional Information  Earth MOID = 1.22397 au   Jupiter MOID = 2.43092 au   T_jup = 3.502  [ 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 15.29   n/a E2021B10   diameter diameter 5.169 km 0.260 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.055   0.005 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   15510 Phoeberounds           Discovered 1999 Oct. 4 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. Phoebe Robeson Rounds (b. 1985) was named a finalist in the 2003 Intel Science Talent Search, a science competition for high school seniors, for her physics project. She attends the Irondequoit High School, Rochester, New York. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20030216/MPCPages.arc Last Updated: 2011-11-22 [ show close-approach data ] Alternate Designations  1999 TF127 = 1992 YE5 = 1997 EK39  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-16 02:17 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin