+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3759 Piironen (1984 AP) Classification: Main-belt Asteroid          SPK-ID: 2003759 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ 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 .1180754479300637 3.3556e-08   a 2.718516596933153 1.0133e-08 au q 2.397526532044958 9.1053e-08 au i 13.05312254171043 4.0827e-06 deg node 292.8703683796201 1.7288e-05 deg peri 165.8947597233249 2.7873e-05 deg M 89.88982854939479 2.018e-05 deg tp 2458791.706048521183 (2019-Nov-04.20604852) 9.1539e-05 TDB period 1637.179922437007 4.48 9.1539e-06 2.506e-08 d yr n .2198903095904853 1.2295e-09 deg/d Q 3.039506661821347 1.133e-08 au   Orbit Determination Parameters    # obs. used (total)      2435      data-arc span      13527 days (37.03 yr)      first obs. used      1984-01-05      last obs. used      2021-01-17      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .41681      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 01:12:57   Additional Information  Earth MOID = 1.41615 au   Jupiter MOID = 2.1119 au   T_jup = 3.312  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 11.96   n/a E2021B10   diameter diameter 32.15 km 1.0 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6 rotation period rot_per 8.213 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Klinglesmith, D.A. III; DeHart, A.; Hanowell, J.; Hendrickx, S. (2015) Minor Planet Bull. 42, 158-159.] geometric albedo albedo 0.0297   0.002 IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 6 SMASSII spectral type spec_B X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 3759 Piironen (1984 AP)          Discovered 1984-Jan-08 by Bowell, E. at Flagstaff (AM) Discovered at the Anderson Mesa station, which is operated by the Lowell Observatory. Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Feb-25 08:37 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin