+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   28P/Neujmin 1 Classification: Jupiter-family Comet          SPK-ID: 1000063 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] alternate orbits: [epoch=2011-Sep-27.0] 45 (default) [epoch=1984-Oct-27.0] SAO/1984 [epoch=1966-Dec-21.0] SAO/1966 [epoch=1949-Jan-04.0] SAO/1948 [epoch=1931-May-19.0] SAO/1931 [epoch=1913-Aug-21.0] SAO/1913 Orbital Elements at Epoch 2455831.5 (2011-Sep-27.0) TDB Reference: JPL 45 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .7740745009334175 6.1505e-08   a 6.922572239764651 9.4712e-08 au q 1.563985588093299 4.3754e-07 au i 14.37789639898481 1.1562e-05 deg node 346.3160970317399 8.7276e-05 deg peri 347.7386530822694 8.6573e-05 deg M 172.8836510574976 1.1736e-05 deg tp 2452636.645410571499 (2002-Dec-28.14541057) 0.00018127 TDB period 6652.726531161382 18.21 0.00013653 3.738e-07 d yr n .05411315170009761 1.1105e-09 deg/d Q 12.28115889143601 1.6803e-07 au   Orbit Determination Parameters    # obs. used (total)      549      data-arc span      19847 days (54.34 yr)      first obs. used      1966-05-16      last obs. used      2020-09-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .42789      source      ORB      producer      Davide Farnocchia      solution date      2020-Sep-28 09:07:43   Additional Information  Earth MOID = .557212 au   Jupiter MOID = .960522 au   T_jup = 2.166  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes comet total magnitude M1 13.2   0.5 45 2 parameter fit from 372 observations, autocmod 2.9a comet total magnitude slope K1 4.5   n/a 45 autocmod 2.9a diameter diameter 21.4 km n/a Lamy,P.L,Toth,I.,Fernandez,Y.R.,Weaver,H.A. (To be published)   geometric albedo albedo 0.025   0.008 Earth, Moon, and Planets, v. 89, Issue 1, p. 117-134 (2002)   28P/Neujmin 1          Discovered 1913-Sep-04 by Neujmin, G. N. at Simeis, Crimea discovered on plate/photo taken on discovery date Reference: comet.dis Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  Perihelion  Year (est.)  New-Style  Desig Roman  Numeral  Year/  Letter   1984.8       1984 XIX   1984c   1966.6       1966 VI   1966a   1948.3       1948 XIII   1948f   1930.1   28P/1931 S1   1931 I   1931d   1911.9   28P/1913 R2   1913 III   1913c  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-25 17:17 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin