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1521 Seinajoki (1938 UB1)
Classification: Main-belt Asteroid          SPK-ID: 2001521
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1386311695798849 1.934e-08  
a 2.850251574712784 1.0241e-08 au
q 2.455117865313442 5.6044e-08 au
i 15.02991878710223 9.5405e-07 deg
node 12.44792959166609 3.1411e-06 deg
peri 49.8449092647642 7.3149e-06 deg
M 8.05045535205379 4.9586e-06 deg
tp 2459161.195600694951
(2020-Nov-07.69560069)
2.418e-05 TDB
period 1757.612846856887
4.81
9.4727e-06
2.593e-08
d
yr
n .204823263919459 1.1039e-09 deg/d
Q 3.245385284112126 1.1661e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2780  
   data-arc span      30095 days (82.40 yr)  
   first obs. used      1938-10-22  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41023  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:34:12  

Additional Information
 Earth MOID = 1.49234 au 
 Jupiter MOID = 2.27845 au 
 T_jup = 3.241 
[ 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 11.93   n/a E2021B10  
diameter diameter 14.813 km 0.070 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 4.32 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Durkee, R.I. (2011) Minor Planet Bull. 38, 39-40.]
[Durech, J.; Hanus, J.; Oszkiewsicz, D.; Vanco, R. (2016) Astron. Astrophys. 587, A48.]
geometric albedo albedo 0.205   0.015 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1521 Seinajoki (1938 UB1)          Discovered 1938-Oct-22 by Vaisala, Y. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1938 UB1 = 1933 UR1 = 1967 UW 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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