+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   5507 Niijima (1987 UJ) Classification: Main-belt Asteroid          SPK-ID: 2005507 [ 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 32 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1344581344210342 3.923e-08   a 2.579241532820476 7.6341e-09 au q 2.232441528096186 1.022e-07 au i 2.643579849563504 3.7944e-06 deg node 337.4550289872034 7.5005e-05 deg peri 21.59234155957911 7.5982e-05 deg M 25.67061033436331 1.1149e-05 deg tp 2459092.612745649052 (2020-Aug-31.11274565) 4.6945e-05 TDB period 1512.991357059787 4.14 6.7173e-06 1.839e-08 d yr n .2379392309944137 1.0564e-09 deg/d Q 2.926041537544766 8.6606e-09 au   Orbit Determination Parameters    # obs. used (total)      2341      data-arc span      13585 days (37.19 yr)      first obs. used      1983-11-07      last obs. used      2021-01-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .46711      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 01:25:12   Additional Information  Earth MOID = 1.22728 au   Jupiter MOID = 2.5168 au   T_jup = 3.411  [ 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 13.75   n/a E2021B10   diameter diameter 5.522 km 0.381 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.231   0.047 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   5507 Niijima (1987 UJ)          Discovered 1987-Oct-21 by Suzuki and Urata at Toyota Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ hide close-approach data ] Close-Approach Data   ...sorted by Date/Time (TDB) Date/Time (TDB) Time Uncertainty (days_HH:MM) Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified 2042-Jul-09 05:43 < 00:01 David 0.0470882721745149 0.0470868446493243 0.0470896999132214 6.19253023531065 6.19253018350201 2467074.737880252 0.508603373020328 181.680625342377 23.1640665816898 -68.0730954787236 282368.425808807 T 32 CATAB v2.0f-lin.ifort 2021-Feb-24 01:25:18 2021-Feb-24 01:25 Alternate Designations  1987 UJ = 1983 VN1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-25 05:56 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin