+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   26303 (1998 SD144) Classification: Main-belt Asteroid          SPK-ID: 2026303 [ 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 33 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .07921603121155403 4.1941e-08   a 2.543899910725476 1.2368e-08 au q 2.342382255998377 1.0563e-07 au i 21.79202145466628 4.8039e-06 deg node 199.2298077230825 1.1789e-05 deg peri 279.4523727686868 3.0871e-05 deg M 34.97898033426466 2.946e-05 deg tp 2458856.503113625109 (2020-Jan-08.00311363) 0.00012101 TDB period 1482.000864507208 4.06 1.0808e-05 2.959e-08 d yr n .2429148380555813 1.7715e-09 deg/d Q 2.745417565452575 1.3348e-08 au   Orbit Determination Parameters    # obs. used (total)      1368      data-arc span      10793 days (29.55 yr)      first obs. used      1990-11-08      last obs. used      2020-05-27      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .52192      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 01:29:42   Additional Information  Earth MOID = 1.44086 au   Jupiter MOID = 2.37914 au   T_jup = 3.340  [ 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 14.5   n/a MPO319410   diameter diameter 3.380 km 0.687 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.295   0.075 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   26303 (1998 SD144)          Discovered 1998-Sep-18 by Elst, E. W. at La Silla Reference: 20010705/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1998 SD144 = 1990 VJ  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-21 09:43 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin