+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   C/2007 W1 (Boattini) Classification: Hyperbolic Comet          SPK-ID: 1002487 [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2454612.5 (2008-May-26.0) TDB Reference: JPL 61 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e 1.000191841611794 4.1198e-06   a -4429.236716961684 95.122 au q .8497119107994742 9.2182e-07 au i 9.889868093013884 4.2457e-05 deg node 334.5298113113664 0.00013393 deg peri 306.5474666634279 0.00014883 deg M -9.994106017436343E-5 3.219e-06 deg tp 2454642.390502443417 (2008-Jun-24.89050244) 0.0001689 TDB period n/a n/a n/a n/a d yr n 3.343572439558445E-6 1.0771e-07 deg/d Q n/a n/a au   Orbit Determination Parameters    # obs. used (total)      699      data-arc span      279 days      first obs. used      2007-11-20      last obs. used      2008-08-25      planetary ephem.      DE431      SB-pert. ephem.      SB431-BIG16      norm. resid. RMS      .93619      source      ORB      producer      Otto Matic      solution date      2014-Jun-13 19:44:06   Additional Information  Earth MOID = .017834 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 12.0   1. 61 from 132 observations, assumed slope, autocmod 2.5c comet total magnitude slope K1 15.   n/a 61 autocmod 2.5c comet nuclear magnitude M2 16.9   1. 61 from 921 observations, autocmod 2.5c comet nuclear magnitude slope K2 5.   n/a 61 autocmod 2.5c comet nuclear phase coefficient PC 0.03   n/a 61 autocmod 2.5c [ show close-approach data ] [ Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ] 2021-Jan-20 00:42 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin