+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3401 Vanphilos (1981 PA) Classification: Mars-crossing Asteroid          SPK-ID: 2003401 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3595485690795021 3.8725e-08   a 2.367746379878869 7.8433e-09 au q 1.516426557050251 9.0725e-08 au i 21.79547132094463 6.8241e-06 deg node 322.3560943282682 1.3687e-05 deg peri 108.6270215650084 1.7751e-05 deg M 174.9406164031878 9.8209e-06 deg tp 2458353.820117924843 (2018-Aug-23.32011792) 3.4682e-05 TDB period 1330.764475017673 3.64 6.6124e-06 1.81e-08 d yr n .270521197971729 1.3442e-09 deg/d Q 3.219066202707487 1.0663e-08 au   Orbit Determination Parameters    # obs. used (total)      1272      data-arc span      27189 days (74.44 yr)      first obs. used      1946-02-19      last obs. used      2020-07-29      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .36386      source      ORB      producer      Otto Matic      solution date      2020-Aug-24 23:03:17   Additional Information  Earth MOID = .662947 au   Jupiter MOID = 2.39874 au   T_jup = 3.367  [ hide covariance matrix ] Orbital Elements at Epoch 2456745.5 (2014-Mar-29.0) TDB Reference: JPL 24 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .359641217734215 3.8591e-08   q 1.516280157659043 9.0245e-08 au tp 2457024.274780896690 (2015-Jan-01.77478090) 3.2487e-05 TDB node 322.3911507879283 1.3682e-05 deg peri 108.7179313490439 1.7726e-05 deg i 21.79838259825424 6.8246e-06 deg   Orbit Determination Parameters    # obs. used (total)      1272      data-arc span      27189 days (74.44 yr)      first obs. used      1946-02-19      last obs. used      2020-07-29      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .36386      source      ORB      producer      Otto Matic      solution date      2020-Aug-24 23:03:17   Additional Information  Jupiter MOID = 2.39874 au   T_jup = 3.367  Orbit Covariance (6×6)   e q tp node peri i e 1.489285662877577E-15 -3.477531829783517E-15 -2.701458982340346E-13 5.127566412367706E-15 -1.69024439625134E-13 -1.346458222791506E-14 q -3.477531829783517E-15 8.144126216092888E-15 6.770856386627661E-13 -1.08309111449327E-14 4.041789429944219E-13 3.181125494908295E-14 tp -2.701458982340346E-13 6.770856386627661E-13 1.055389687636085E-9 -6.861127376315261E-13 3.761962015578898E-10 1.097719740549663E-11 node 5.127566412367706E-15 -1.08309111449327E-14 -6.861127376315261E-13 1.871872064674996E-10 -1.733139300419585E-10 3.301474856739455E-11 peri -1.69024439625134E-13 4.041789429944219E-13 3.761962015578898E-10 -1.733139300419585E-10 3.141986258888141E-10 -2.617932543736803E-11 i -1.346458222791506E-14 3.181125494908295E-14 1.097719740549663E-11 3.301474856739455E-11 -2.617932543736803E-11 4.65752516027303E-11 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.4   n/a MPO452211   diameter diameter 7.023 km 1.045 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)   rotation period rot_per 4.2261 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Brinsfield, J. (2008) Minor Planet Bull. 35, 119-122.] [Pravec, P.; Wolf, M.; Sarounova, L. (2008) http://www.asu.cas.cz/~ppravec/neo.htm] [Stephens, R.D. (2008) Minor Planet Bull. 35, 126-127.] [Warner, B.D. (2015) Minor Planet Bull. 42, 54-60.] [Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.] [Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.] geometric albedo albedo 0.307   0.146 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)   SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002) 3401 Vanphilos (1981 PA)          Discovered 1981-Aug-01 by Harvard College at Agassiz Station Discovered at Oak Ridge Observatory (until 1981 Harvard College's Agassiz Station). The principal observers are R. E. McCrosky, C.-Y. Shao, G. Schwartz, and J. H. Bulger, with some assistance from others. Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1981 PA = 1946 DA  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-18 08:25 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin