+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1998 Titius (1938 DX1) Classification: Main-belt Asteroid          SPK-ID: 2001998 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 31 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .06346710839241509 3.1107e-08   a 2.419393563530359 7.3241e-09 au q 2.265841649989866 7.6112e-08 au i 7.624345313035169 3.7453e-06 deg node 351.7433181189836 2.5687e-05 deg peri 246.7651491449338 4.3164e-05 deg M 237.0208770730733 3.708e-05 deg tp 2459470.055680546077 (2021-Sep-12.55568055) 0.00014242 TDB period 1374.542613196471 3.76 6.2416e-06 1.709e-08 d yr n .2619053032941825 1.1893e-09 deg/d Q 2.572945477070852 7.7889e-09 au   Orbit Determination Parameters    # obs. used (total)      3322      data-arc span      30010 days (82.16 yr)      first obs. used      1938-02-25      last obs. used      2020-04-25      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .40177      source      ORB      producer      Otto Matic      solution date      2020-May-20 01:33:33   Additional Information  Earth MOID = 1.26754 au   Jupiter MOID = 2.4386 au   T_jup = 3.500  [ 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 12.3   n/a MPO400014   diameter diameter 14.242 km 0.170 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 6.13 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Stephens, R.D. (2002) Minor Planet Bull. 29, 47-48.] [Stephens R.D. (2017) Minor Planet Bull. 44, 321-323.] geometric albedo albedo 0.126   0.031 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   SMASSII spectral type spec_B Xc   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) 1998 Titius (1938 DX1)          Discovered 1938-Feb-24 by Bohrmann, A. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1938 DX1 = 1966 TF  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Oct-31 12:01 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin