+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1621 Druzhba (1926 TM) Classification: Main-belt Asteroid          SPK-ID: 2001621 [ 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 41 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1190596775693322 3.0614e-08   a 2.23002445536093 5.0885e-09 au q 1.964518462733932 6.9572e-08 au i 3.171815685455081 3.5844e-06 deg node 181.8366966567478 5.6194e-05 deg peri 238.7701042029763 5.81e-05 deg M 8.468188190354448 1.5166e-05 deg tp 2458971.887825466565 (2020-May-02.38782547) 5.1218e-05 TDB period 1216.362060041276 3.33 4.1633e-06 1.14e-08 d yr n .2959645091098812 1.013e-09 deg/d Q 2.495530447987928 5.6944e-09 au   Orbit Determination Parameters    # obs. used (total)      2950      data-arc span      34380 days (94.13 yr)      first obs. used      1926-10-01      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .40593      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 02:01:44   Additional Information  Earth MOID = .979182 au   Jupiter MOID = 2.78172 au   T_jup = 3.631  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 11.8   n/a MPO502169   diameter diameter 12.694 km 0.296 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   rotation period rot_per 99.20 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List: [Stephens, R.D. (2010) Minor Planet Bull. 37, 28-29.] [Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.] [Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.] geometric albedo albedo 0.244   0.039 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)   B-V BV 0.898   0.026 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=2.29 deg. U-B UB 0.503   0.048 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=2.29 deg. Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices 1621 Druzhba (1926 TM)          Discovered 1926-Oct-01 by Belyavskij, S. at Simeis Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1926 TM = 1927 AE = 1931 EO = 1946 UH = 1949 QS1 = 1951 EK1 = 1951 ER1 = 1958 GA = 1979 QP4  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Jan-21 06:05 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin