+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   29981 (1999 TD10) Classification: TransNeptunian Object          SPK-ID: 2029981 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .8729679807345582 7.4582e-06   a 96.19698281664569 0.0058532 au q 12.22009697444151 2.77e-05 au i 5.962420903677833 1.2063e-05 deg node 184.5777245122769 0.00015695 deg peri 172.4134956773318 0.00031036 deg M 8.060903056984676 0.00074427 deg tp 2451483.974415186983 (1999-Nov-01.47441519) 0.0083766 TDB period 344620.0991247037 943.52 31.453 0.08611 d yr n .001044628566106154 9.5341e-08 deg/d Q 180.1738686588498 0.010963 au   Orbit Determination Parameters    # obs. used (total)      238      data-arc span      6695 days (18.33 yr)      first obs. used      1997-09-05      last obs. used      2016-01-04      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      1      norm. resid. RMS      .46088      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 01:08:39   Additional Information  Earth MOID = 11.2147 au   Jupiter MOID = 7.26265 au   T_jup = 4.226  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 8.7   n/a MPO181526   rotation period rot_per 15.382 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Choi, Y.J.; Brosch, N.; Prialnik, D. (2003) Icarus 165, 101-111.] [Ortiz, J.L.; Gutierrez, P.J.; Casanova, V.; Sota, A. (2003) Astron. Astrophys. 407, 1149-1155.] [Rousselot, P.; Petit, J.-M.; Poulet, F.; Lacerda, P.; Ortiz, J. (2003) Astron. Astrophys. 407, 1139-1147.] [Mueller, B.E.A.; Hergenrother, C.W.; Samarasinha, N.H.; Campins, H.; McCarthy Jr.; D.W. (2004) Icarus 171, 506-515.] [Rabinowitz, D.L.; Schaefer, B.E.; Tourtellotte, S.W. (2007) Astron. J. 133, 26-43.] 29981 (1999 TD10)          Discovered 1999-Oct-03 by Spacewatch at Kitt Peak Reference: 20011002/Numbers.arc Last Updated: 2004-04-19 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Discovery Circumstances ] 2021-Mar-08 16:39 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin