+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   349P/Lemmon Classification: Encke-type Comet          SPK-ID: 1003494 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2457280.5 (2015-Sep-15.0) TDB Reference: JPL 11 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .300511259198777 1.5437e-06   a 3.568116015942055 9.787e-07 au q 2.495856979023984 4.8574e-06 au i 5.498796979791869 7.9571e-05 deg node 331.8155945540785 0.00045067 deg peri 256.2606882242893 0.0010754 deg M 255.7554662087082 0.000679 deg tp 2457993.365616176798 (2017-Aug-27.86561618) 0.0043602 TDB period 2461.823296533227 6.74 0.0010129 2.773e-06 d yr n .1462330787538476 6.0165e-08 deg/d Q 4.640375052860125 1.2728e-06 au   Orbit Determination Parameters    # obs. used (total)      123      data-arc span      3069 days (8.40 yr)      first obs. used      2010-03-14      last obs. used      2018-08-08      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      2      norm. resid. RMS      .52486      source      ORB      producer      Otto Matic      solution date      2020-Nov-11 11:12:53   Additional Information  Earth MOID = 1.49229 au   Jupiter MOID = .631768 au   T_jup = 3.031  [ 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 absolute magnitude H 15.7   n/a MPO176524   comet total magnitude M1 7.5   0.6 11 from 75 observations, assumed slope, autocmod 2.8 comet total magnitude slope K1 24.5   n/a 11 autocmod 2.8 comet nuclear magnitude M2 15.7   0.6 11 from 24 observations, autocmod 2.8 comet nuclear magnitude slope K2 5.   n/a 11 autocmod 2.8 comet nuclear phase coefficient PC 0.03   n/a 11 autocmod 2.8 diameter diameter 2.983 km 0.404 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.104   0.029 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   2017.7   349P/2017 B1         2010.9   349P/2010 EY90        [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Close-Approach Data ] 2021-Mar-07 09:47 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin