+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   3948 Bohr (1985 RF) Classification: Main-belt Asteroid          SPK-ID: 2003948 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 39 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1949637784350557 2.9404e-08   a 2.262660048641824 5.0908e-09 au q 1.821523296244567 6.5664e-08 au i 2.73019327689204 3.347e-06 deg node 190.6402141455985 5.7871e-05 deg peri 121.0611552758533 5.8396e-05 deg M 161.2105772952202 8.0167e-06 deg tp 2458643.803587904342 (2019-Jun-09.30358790) 2.7255e-05 TDB period 1243.161036433922 3.40 4.1955e-06 1.149e-08 d yr n .2895843655401882 9.7731e-10 deg/d Q 2.703796801039081 6.0833e-09 au   Orbit Determination Parameters    # obs. used (total)      2733      data-arc span      16536 days (45.27 yr)      first obs. used      1975-10-14      last obs. used      2021-01-21      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .47933      source      ORB      producer      Otto Matic      solution date      2021-Feb-24 01:14:25   Additional Information  Earth MOID = .807238 au   Jupiter MOID = 2.56991 au   T_jup = 3.592  [ 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 13.44   n/a E2021B10   diameter diameter 5.144 km 0.211 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   rotation period rot_per 24.884 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Klinglesmith III, D.A.; Risley, E.; Turk, J.; Vargas, A.; et al. (2013) Minor Planet Bull. 40, 15-16.] [Owings, L. (2013) Minor Planet Bull. 40, 104-106.] [Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.] [Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.] geometric albedo albedo 0.320   0.079 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   3948 Bohr (1985 RF)          Discovered 1985-Sep-15 by Jensen, P. at Brorfelde Reference: DISCOVERY.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  1985 RF = 1975 TG5 = 1975 VH7 = 1978 NR1 = 1981 JF  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Mar-07 09:16 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin