+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1575 Winifred (1950 HH) Classification: Main-belt Asteroid          SPK-ID: 2001575 [ 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 38 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1788872169127255 3.6337e-08   a 2.374635786469311 6.0406e-09 au q 1.949843799446454 8.6313e-08 au i 24.82072859573236 4.4154e-06 deg node 206.8210133098302 8.2082e-06 deg peri 348.5942489231167 1.3165e-05 deg M 67.7585659909989 1.0844e-05 deg tp 2458748.931856376394 (2019-Sep-22.43185638) 4.0052e-05 TDB period 1336.576864931423 3.66 5.1e-06 1.396e-08 d yr n .2693447787744485 1.0277e-09 deg/d Q 2.799427773492167 7.1212e-09 au   Orbit Determination Parameters    # obs. used (total)      2661      data-arc span      33806 days (92.56 yr)      first obs. used      1928-04-18      last obs. used      2020-11-07      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .36545      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:01:26   Additional Information  Earth MOID = .950213 au   Jupiter MOID = 2.17233 au   T_jup = 3.398  [ 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 12.1   n/a MPO435711   diameter diameter 9.488 km 0.254 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 125. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Warner, B.D. (2010) Minor Planet Bull. 37, 24-27.] geometric albedo albedo 0.236   0.033 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   1575 Winifred (1950 HH)          Discovered 1950-Apr-20 by Cameron, R. C. at Brooklyn Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1950 HH = 1928 HG = 1939 GK = 1950 HD1 = 1977 UH1  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-22 23:17 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin