+ 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 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 45 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .04659741398334261 1.9518e-08   a 2.237022373900089 4.5025e-09 au q 2.132782916253467 4.4282e-08 au i 1.39730455050592 1.6411e-06 deg node 91.13124838284595 3.1567e-05 deg peri 355.0683407281343 3.7044e-05 deg M 16.54598614790074 1.433e-05 deg tp 2459340.331338575324 (2021-May-05.83133858) 4.8603e-05 TDB period 1222.092048919594 3.35 3.6896e-06 1.01e-08 d yr n .2945768285770802 8.8936e-10 deg/d Q 2.341261831546712 4.7123e-09 au   Orbit Determination Parameters    # obs. used (total)      3444      data-arc span      34019 days (93.14 yr)      first obs. used      1928-02-22      last obs. used      2021-04-13      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .38391      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 12:02:01   Additional Information  Earth MOID = 1.14895 au   Jupiter MOID = 2.72613 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 12.47   n/a MPCxxxxx   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. 2020-October); 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 ] 2021-Jul-23 20:42 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin