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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1020497666592381 1.797e-08  
a 2.245084159744928 4.7078e-09 au
q 2.015973845112606 3.9805e-08 au
i 5.256730565350615 2.9716e-07 deg
node 17.4922177557081 4.255e-06 deg
peri 196.3017386985255 7.9399e-06 deg
M 148.0935707531112 4.7396e-06 deg
tp 2458695.046661497096
(2019-Jul-30.54666150)
1.5831e-05 TDB
period 1228.704264038571
3.36
3.8648e-06
1.058e-08
d
yr
n .2929915770103479 9.2158e-10 deg/d
Q 2.474194474377249 5.1882e-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 = 1.00941 au 
 Jupiter MOID = 2.4902 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

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1917-Jul-21 09:29 < 00:01 Eunom 0.0215887219238105 0.0215858339493834 0.0215916111125979 6.47359244586703 6.47359234542358 2421430.894867275 0.370494646731634 300.006892149541 35.1823110926564 62.055938313973 81215.1523376239 T 36 CATAB v2.0f-lin.ifort 2021-Apr-12 12:29:13 2021-Apr-12 12:29

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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