+ 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 2455297.5 (2010-Apr-11.0) TDB Reference: JPL 29 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 1.000413202490796 2.36e-06   a -980.3592752125166 5.5957 au q .4050868943926803 1.514e-06 au i 77.03076498095443 8.5241e-05 deg node 322.6226629291746 2.2567e-05 deg peri 130.6931027466904 0.00023419 deg M -.00265470905718023 2.2728e-05 deg tp 2455380.178150077313 (2010-Jul-02.67815008) 3.2469e-05 TDB period n/a n/a n/a n/a d yr n 3.210895568778196E-5 2.7491e-07 deg/d Q n/a n/a au   Orbit Determination Parameters    # obs. used (total)      751      data-arc span      315 days      first obs. used      2009-08-18      last obs. used      2010-06-29      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      norm. resid. RMS      .70513      source      ORB      producer      Otto Matic      solution date      2021-Apr-15 23:31:34   Additional Information  Earth MOID = .446156 au   Jupiter MOID = 1.22068 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 9.9   2. 29 2 parameter fit from 162 observations, autocmod 2.9c comet total magnitude slope K1 6.75   n/a 29 autocmod 2.9c [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] 2021-Apr-16 18:41 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin