+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   4015 Wilson-Harrington (1979 VA) Classification: Apollo [NEO, PHA]          SPK-ID: 2004015 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 184 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .6311870131501052 3.9254e-08   a 2.625914318209086 4.954e-09 au q .9684713029105984 1.0419e-07 au i 2.798294802795844 5.2523e-06 deg node 266.8177006839392 9.827e-05 deg peri 95.37013411934119 9.8248e-05 deg M 171.0177161907802 3.1513e-06 deg tp 2458262.157520864563 (2018-May-23.65752086) 1.2219e-05 TDB period 1554.244194164295 4.26 4.3983e-06 1.204e-08 d yr n .2316238344989084 6.5547e-10 deg/d Q 4.283357333507575 8.0809e-09 au   Orbit Determination Parameters    # obs. used (total)      983      data-arc span      25702 days (70.37 yr)      first obs. used      1949-11-19      last obs. used      2020-04-02      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .54633      source      ORB      producer      Otto Matic      solution date      2020-Apr-03 06:35:14   Additional Information  Earth MOID = .0430103 au   Jupiter MOID = 1.22394 au   T_jup = 3.082  [ 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 absolute magnitude H 16.02   n/a E2021B10   diameter diameter 4 km 0.5 H. Campins et al. (1995) Planet. Space Sci., v.43, pp.733-736 based on ILM thermal model rotation period rot_per 3.5736 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so. Published Reference List: [Harris, A.W.; Young, J.W. (1983) Icarus 54, 59-109.] [Urakawa, S.; Okumura, S-i.; Nishiyama, K.; Sakamoto, T.; et al. (2011) Icarus 215, 17-26.] [Urakawa, S.; Okumura, S-i.; Nishiyama, K.; Sakamoto, T.; et al. (2012) ACM 2012, #6088.] geometric albedo albedo 0.05   0.01 H. Campins et al. (1995) Planet. Space Sci., v.43, pp.733-736 based on ILM thermal model B-V BV 0.666   0.018 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=17.84, mean=18.14, max.=18.45) deg. U-B UB 0.279   0.028 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=3; phase (min.=17.84, mean=18.14, max.=18.45) deg. Tholen spectral type spec_T CF   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 6 color indices 4015 Wilson-Harrington (1979 VA)          Discovered 1979-Nov-15 by Helin, E. F. at Palomar Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1979 VA = 107P  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Feb-25 17:06 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin