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1446 Sillanpaa (1938 BA)
Classification: Main-belt Asteroid          SPK-ID: 2001446
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 32 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1018742017219044 3.1776e-08  
a 2.245871919152197 5.0186e-09 au
q 2.017075510218925 7.0477e-08 au
i 5.255705493481279 3.7272e-06 deg
node 17.50227862694352 3.2365e-05 deg
peri 196.4753321555879 3.6479e-05 deg
M 89.32256903579139 1.6948e-05 deg
tp 2458695.475580591000
(2019-Jul-30.97558059)
5.7722e-05 TDB
period 1229.35101590327
3.37
4.1207e-06
1.128e-08
d
yr
n .292837436454623 9.8156e-10 deg/d
Q 2.474668328085468 5.5299e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3105  
   data-arc span      30229 days (82.76 yr)  
   first obs. used      1938-01-26  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40762  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:18:54  

Additional Information
 Earth MOID = 1.01148 au 
 Jupiter MOID = 2.49101 au 
 T_jup = 3.618 
[ 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 12.6   n/a MPO332828  
diameter diameter 8.167 km 0.154 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 9.6602 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Galad, A. (2009) Minor Planet Bull. 36, 183-186.]
[Pravec, P.; Wolf, M.; Sarounova, L. (2009) http://www.asu.cas.cz/~ppravec/neo.htm]
[Hanus, J.; Broz, M.; Durech, J.; Warner, B.D.; et al. (2013) Astron. Astrophys. 559, A134.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.241   0.046 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1446 Sillanpaa (1938 BA)          Discovered 1938-Jan-26 by Vaisala, Y. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1938 BA = 1935 GB = 1952 HQ3 = 1955 DQ = 1965 EA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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