+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   732 Tjilaki (A912 HK) Classification: Main-belt Asteroid          SPK-ID: 2000732 [ 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 .04362437127884023 3.4722e-08   a 2.45613229504751 6.8643e-09 au q 2.348985067898407 8.4763e-08 au i 10.99405119548044 3.836e-06 deg node 173.3457974295588 1.8276e-05 deg peri 64.90028486855508 4.8828e-05 deg M 359.8028033315001 4.3551e-05 deg tp 2459001.270146122207 (2020-May-31.77014612) 0.00017009 TDB period 1405.970020201046 3.85 5.8941e-06 1.614e-08 d yr n .2560509789166927 1.0734e-09 deg/d Q 2.563279522196612 7.1638e-09 au   Orbit Determination Parameters    # obs. used (total)      3051      data-arc span      39009 days (106.80 yr)      first obs. used      1913-08-28      last obs. used      2020-06-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .40534      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:19:38   Additional Information  Earth MOID = 1.36243 au   Jupiter MOID = 2.42802 au   T_jup = 3.466  [ 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 10.5   n/a MPO365251   diameter diameter 29.791 km 0.431 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 12.34 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Florczak, M.; Dotto, E.; Barucci, M.A.; Birlan, M.; et al. (1997) Planet. Space Sci. 45, 1423-1435.] [Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.] [Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.] geometric albedo albedo 0.138   0.024 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   732 Tjilaki (A912 HK)          Discovered 1912-Apr-15 by Massinger, A. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A912 HK = 1958 FC  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2020-Jul-10 20:22 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin