+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   70207 Davidunlap (1999 RP33) Classification: Main-belt Asteroid          SPK-ID: 2070207 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 21 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09674453907005623 4.5373e-08   a 2.390549203350382 1.0147e-08 au q 2.159276622547959 1.0895e-07 au i 7.05670078913316 5.4481e-06 deg node 7.846588740888247 2.9712e-05 deg peri 51.76214803957888 3.8585e-05 deg M 160.4267785135199 2.5797e-05 deg tp 2458398.884081209950 (2018-Oct-07.38408121) 9.482e-05 TDB period 1350.034780796685 3.70 8.5957e-06 2.353e-08 d yr n .2666597965628384 1.6978e-09 deg/d Q 2.621821784152805 1.1129e-08 au   Orbit Determination Parameters    # obs. used (total)      1183      data-arc span      10115 days (27.69 yr)      first obs. used      1992-10-01      last obs. used      2020-06-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .50072      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 23:34:26   Additional Information  Earth MOID = 1.17875 au   Jupiter MOID = 2.64878 au   T_jup = 3.516  [ 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 15.2   n/a MPO468640   diameter diameter 2.376 km 0.223 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.260   0.059 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   70207 Davidunlap           Discovered 1999 Sept. 4 by M. Collins and M. White at Anza. David Alexander Dunlap (1863-1924), born in Pembroke, Ontario, a mining magnate, philanthropist and amateur astronomer, was the namesake of the David Dunlap Observatory, location of Canada's largest optical telescope, and where the first black-hole candidate Cygnus X-1 was discovered and confirmed. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: 20090409/MPCPages.arc Last Updated: 2009-04-10 Alternate Designations  1999 RP33 = 2001 CW8  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-21 19:08 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin