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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.DBLast 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 ]
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