+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1811 Bruwer (4576 P-L) Classification: Main-belt Asteroid          SPK-ID: 2001811 [ 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 36 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1095906311220614 3.2283e-08   a 3.138173588513247 1.3081e-08 au q 2.794259164377496 1.07e-07 au i 8.519589081503888 3.8185e-06 deg node 167.8192394752163 2.6045e-05 deg peri 137.3187628876485 3.3164e-05 deg M 339.3526766814684 2.066e-05 deg tp 2459316.959555738603 (2021-Apr-12.45955574) 0.00011661 TDB period 2030.550857324336 5.56 1.2696e-05 3.476e-08 d yr n .1772917918807378 1.1085e-09 deg/d Q 3.482088012648997 1.4515e-08 au   Orbit Determination Parameters    # obs. used (total)      3008      data-arc span      32658 days (89.41 yr)      first obs. used      1931-05-19      last obs. used      2020-10-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .43457      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 04:15:14   Additional Information  Earth MOID = 1.78514 au   Jupiter MOID = 1.829 au   T_jup = 3.185  [ 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 11.01   n/a E2021B10   diameter diameter 28.072 km 0.103 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 17.565 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Brinsfield, J.W. (2011) Minor Planet Bull. 38, 73-74.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] geometric albedo albedo 0.074   0.008 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   1811 Bruwer (4576 P-L)          Discovered 1960-Sep-24 by PLS at Palomar These planets have all been discovered as a result of the Palomar survey of faint minor planets and subsequently identified with planets observed at other oppositions. In Sept. and Oct. 1960, T. Gehrels exposed 130 plates with the 122 cm Schmidt camera at Palomar. In the following years C. J. van Houten and I. van Houten-Groeneveld measured these plates astrometrically and photometrically at Leiden. P. Herget, Cincinnati, computed the orbits of the planets found on the NORC computer, Dahlgren, Virginia, USA. Note: "planet" implies "minor planet" Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  4576 P-L = 1931 KM = 1948 MJ = 1965 RA = 1970 KJ  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-07 21:34 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin