+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   13950 (1990 RP9) Classification: Main-belt Asteroid          SPK-ID: 2013950 [ 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 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1137031813987786 3.5479e-08   a 2.360445618915953 6.7727e-09 au q 2.0920554425264 8.2887e-08 au i 5.608574726997816 3.3824e-06 deg node 247.2348230980994 3.8364e-05 deg peri 45.01829148090379 4.1673e-05 deg M 164.7008311796527 1.666e-05 deg tp 2458594.485917910516 (2019-Apr-20.98591791) 6.1027e-05 TDB period 1324.614259622308 3.63 5.701e-06 1.561e-08 d yr n .2717772343041575 1.1697e-09 deg/d Q 2.628835795305506 7.5428e-09 au   Orbit Determination Parameters    # obs. used (total)      2213      data-arc span      18191 days (49.80 yr)      first obs. used      1971-05-13      last obs. used      2021-03-02      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .46007      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 00:13:30   Additional Information  Earth MOID = 1.07832 au   Jupiter MOID = 2.51337 au   T_jup = 3.536  [ 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 13.9   n/a MPO502274   diameter diameter 3.463 km 0.437 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 6.550 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Benishek, V. (2020) Minor Planet Bull. 47, 75-83.] geometric albedo albedo 0.535   0.097 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   13950 (1990 RP9)          Discovered 1990-Sep-14 by Holt, H. E. at Palomar Reference: 20000320/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1990 RP9 = 1978 EM7 = 1994 UX  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-19 13:59 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin