+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1664 Felix (1929 CD) Classification: Main-belt Asteroid          SPK-ID: 2001664 [ 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 40 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2256354917203678 1.3678e-08   a 2.337315341929378 5.1954e-09 au q 1.809934045447584 3.1826e-08 au i 6.115779301258598 4.4693e-07 deg node 43.99410652687057 6.4914e-06 deg peri 107.7326937289707 6.8265e-06 deg M 242.185838558027 2.9548e-06 deg tp 2459627.639157957293 (2022-Feb-17.13915796) 1.1884e-05 TDB period 1305.191964892622 3.57 4.3518e-06 1.191e-08 d yr n .275821495751866 9.1965e-10 deg/d Q 2.864696638411173 6.3677e-09 au   Orbit Determination Parameters    # obs. used (total)      2756      data-arc span      33610 days (92.02 yr)      first obs. used      1929-02-04      last obs. used      2021-02-11      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .41698      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 12:46:24   Additional Information  Earth MOID = .83127 au   Jupiter MOID = 2.15208 au   T_jup = 3.525  [ 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 12.63   n/a E2021B10   diameter diameter 8.424 km 0.808 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 3.3454 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Higgins, D.; Pravec, P.; Kusnirak, P.; Hornoch, K.; Brinsfield, J.W.; Allen, B.; Warner, B.D. (2008) Minor Planet Bull. 35, 123-126.] geometric albedo albedo 0.382   0.144 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 1664 Felix (1929 CD)          Discovered 1929-Feb-04 by Delporte, E. at Uccle Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1929 CD = 1936 AD = 1947 FC = 1949 UN1 = 1949 WC = 1954 DD = 1956 TV = 1961 AE  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-14 15:30 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin