+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   21056 (1991 CA1) Classification: Mars-crossing Asteroid          SPK-ID: 2021056 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB Reference: JPL 35 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1068686767050671 8.7115e-09   a 1.850424701181036 3.436e-09 au q 1.65267226202345 1.5939e-08 au i 25.55905988749576 6.4814e-07 deg node 123.9542866551532 1.5396e-06 deg peri 305.3312448243222 6.1584e-06 deg M 88.4388127038663 5.5418e-06 deg tp 2459170.636551149939 (2020-Nov-17.13655115) 1.4001e-05 TDB period 919.402229632909 2.52 2.5608e-06 7.011e-09 d yr n .3915587632887705 1.0906e-09 deg/d Q 2.048177140338623 3.8032e-09 au   Orbit Determination Parameters    # obs. used (total)      2174      data-arc span      11083 days (30.34 yr)      first obs. used      1991-02-08      last obs. used      2021-06-13      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .41417      source      ORB      producer      Otto Matic      solution date      2021-Jul-08 05:04:53   Additional Information  Earth MOID = .721788 au   Jupiter MOID = 3.14802 au   T_jup = 3.882  [ 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 14.87   n/a MPCxxxxx   rotation period rot_per 5.60 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Warner, B.D. (2006) Minor Planet Bull. 33, 58-62.] [Warner, B.D. (2011) Minor Planet Bull. 38, 142-149.] [Stephens, R.D. (2016) Minor Planet Bull. 43, 252-255.] 21056 (1991 CA1)          Discovered 1991-Feb-14 by Helin, E. F. at Palomar Reference: 20010208/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1991 CA1 = 1999 LZ  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Aug-01 04:59 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin