+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1156 Kira (1928 DA) Classification: Main-belt Asteroid          SPK-ID: 2001156 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 34 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .04634253920626686 3.2406e-08   a 2.236756185917047 5.5101e-09 au q 2.133099224676327 7.1923e-08 au i 1.39732178620456 3.4767e-06 deg node 91.13189700040772 0.00014235 deg peri 355.0175062875239 0.0001476 deg M 259.9107789084132 3.9601e-05 deg tp 2459340.212248811225 (2021-May-05.71224881) 0.00013463 TDB period 1221.873926465403 3.35 4.515e-06 1.236e-08 d yr n .2946294148704821 1.0887e-09 deg/d Q 2.340413147157768 5.7654e-09 au   Orbit Determination Parameters    # obs. used (total)      2663      data-arc span      33706 days (92.28 yr)      first obs. used      1928-02-22      last obs. used      2020-06-04      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42271      source      ORB      producer      Otto Matic      solution date      2020-Jun-23 15:26:52   Additional Information  Earth MOID = 1.1493 au   Jupiter MOID = 2.72798 au   T_jup = 3.636  [ 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 12.4   n/a MPO492763   diameter diameter 6.831 km 0.211 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 2.9710 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Pravec, P.; Wolf, M.; Sarounova, L. (2012) http://www.asu.cas.cz/~ppravec/neo.htm] geometric albedo albedo 0.181   0.052 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   1156 Kira (1928 DA)          Discovered 1928-Feb-22 by Reinmuth, K. at Heidelberg Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1928 DA = 1935 FY = 1938 DA = 1953 RC1 = 1955 FW1 = 1973 QC2  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Jul-05 11:25 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin