+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   253P/PANSTARRS Classification: Jupiter-family Comet          SPK-ID: 1003147 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2455819.5 (2011-Sep-15.0) TDB Reference: JPL 16 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .4125867224294139 6.7314e-07   a 3.471899321694214 5.3002e-06 au q 2.039439759951493 1.5313e-06 au i 4.939277717195621 2.7667e-05 deg node 146.9382015596501 0.00018627 deg peri 231.0057832542513 0.00034184 deg M 349.3141048466129 0.00012537 deg tp 2455889.638668863034 (2011-Nov-24.13866886) 0.00073742 TDB period 2362.920506728795 6.47 0.0054109 1.481e-05 d yr n .1523538345766784 3.4888e-07 deg/d Q 4.904358883436936 7.487e-06 au Additional Model Parameters  Parameter Value Uncertainty (1-sigma)  A1 [EST] -2.862363072312005E-9 2.49E-9 A2 [EST] -4.434851678726288E-11 2.704E-11   Orbit Determination Parameters    # obs. used (total)      362      data-arc span      7413 days (20.30 yr)      first obs. used      1998-09-14      last obs. used      2018-12-31      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      2      norm. resid. RMS      .63013      source      ORB      producer      Otto Matic      solution date      2020-Nov-11 11:13:05   Additional Information  Earth MOID = 1.04498 au   Jupiter MOID = .606845 au   T_jup = 2.981  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 13.5   0.8 16 2 parameter fit from 178 observations, autocmod 2.8 comet total magnitude slope K1 12.75   n/a 16 autocmod 2.8 comet nuclear magnitude M2 15.9   0.5 16 from 141 observations, autocmod 2.8 comet nuclear magnitude slope K2 5.   n/a 16 autocmod 2.8 comet nuclear phase coefficient PC 0.03   n/a 16 autocmod 2.8 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2011.9   253P/2011 R2         1999.0   253P/1998 RS22        [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Feb-25 17:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin