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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.


Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1018742027691878 3.1727e-08  
a 2.245871918946678 5.0062e-09 au
q 2.01707550768228 7.0346e-08 au
i 5.255705503689589 3.7259e-06 deg
node 17.50227871009067 3.2059e-05 deg
peri 196.4753327995691 3.6181e-05 deg
M 89.32256853103 1.6924e-05 deg
tp 2458695.475582356560
(2019-Jul-30.97558236)
5.7638e-05 TDB
period 1229.351015734524
3.37
4.1104e-06
1.125e-08
d
yr
n .2928374364948191 9.7913e-10 deg/d
Q 2.474668330211077 5.5162e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3154  
   data-arc span      30239 days (82.79 yr)  
   first obs. used      1938-01-26  
   last obs. used      2020-11-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40607  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:00:37  

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. 2020-October); 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

[ show close-approach data ]
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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