+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   C/2009 R1 (McNaught) Classification: Hyperbolic Comet          SPK-ID: 1003036 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2455299.5 (2010-Apr-13.0) TDB Reference: JPL 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 1.000406751994624 2.11e-06   a -995.8983735013639 5.163 au q .4050836498645098 1.3504e-06 au i 77.03083803769042 7.5951e-05 deg node 322.622710199475 2.1177e-05 deg peri 130.6936771145205 0.00020966 deg M -.002530103067458741 1.9674e-05 deg tp 2455380.178288002300 (2010-Jul-02.67828800) 2.9972e-05 TDB period n/a n/a n/a n/a d yr n 3.136039608806042E-5 2.4387e-07 deg/d Q n/a n/a au   Orbit Determination Parameters    # obs. used (total)      765      data-arc span      344 days      first obs. used      2009-07-20      last obs. used      2010-06-29      planetary ephem.      DE431      SB-pert. ephem.      SB431-BIG16      norm. resid. RMS      .79029      source      ORB      producer      Otto Matic      solution date      2014-Jun-13 19:44:24   Additional Information  Earth MOID = .446111 au  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 9.8   2. 28 2 parameter fit from 162 observations, autocmod 2.5c comet total magnitude slope K1 7.   n/a 28 autocmod 2.5c [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] 2021-Jan-26 16:44 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin