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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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Orbital Elements at Epoch 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1020439800750933 1.7957e-08  
a 2.245079418081582 4.6806e-09 au
q 2.015982578675863 3.9756e-08 au
i 5.256770266587837 2.9717e-07 deg
node 17.49185218980612 4.2549e-06 deg
peri 196.2446286686458 7.9471e-06 deg
M 205.5899807943904 4.7958e-06 deg
tp 2459923.510133212018
(2022-Dec-10.01013321)
1.694e-05 TDB
period 1228.700371468084
3.36
3.8424e-06
1.052e-08
d
yr
n .2929925052190409 9.1625e-10 deg/d
Q 2.474176257487302 5.1582e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3389  
   data-arc span      30333 days (83.05 yr)  
   first obs. used      1938-01-26  
   last obs. used      2021-02-12  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .40221  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:27:55  

Additional Information
 Earth MOID = 1.01104 au 
 Jupiter MOID = 2.48911 au 
 T_jup = 3.619 
[ 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 12.68   n/a MPCxxxxx  
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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