+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1121 Natascha (1928 RZ) Classification: Main-belt Asteroid          SPK-ID: 2001121 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1583888265534571 2.4884e-08   a 2.546380994043183 7.0877e-09 au q 2.143062696438658 6.1403e-08 au i 6.164447144391926 1.083e-06 deg node 357.8936017286041 8.2026e-06 deg peri 50.10017586672918 9.0999e-06 deg M 216.6905285735112 7.0018e-06 deg tp 2459791.320963332630 (2022-Jul-30.82096333) 3.0495e-05 TDB period 1484.169501726547 4.06 6.1966e-06 1.697e-08 d yr n .2425598960099969 1.0127e-09 deg/d Q 2.949699291647709 8.2103e-09 au   Orbit Determination Parameters    # obs. used (total)      3182      data-arc span      33061 days (90.52 yr)      first obs. used      1930-02-24      last obs. used      2020-08-31      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .4147      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 12:01:10   Additional Information  Earth MOID = 1.15763 au   Jupiter MOID = 2.46437 au   T_jup = 3.417  [ 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 11.57   n/a E2021B10   diameter diameter 12.859 km 0.443 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 13.197 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Moravec, P.; Letfullina, A.; Ditteon, R. (2013) Minor Planet Bull. 40, 17-20.] [Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.] geometric albedo albedo 0.294   0.023 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   1121 Natascha (1928 RZ)          Discovered 1928-Sep-11 by Shajn, P. at Simeis Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1928 RZ = A918 EK  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-22 23:24 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin