1446 Sillanpää

1446 Sillanpää
Discovery [1]
Discovered by Y. Väisälä
Discovery site Turku Observatory
Discovery date 26 January 1938
Designations
MPC designation 1446 Sillanpaa
Named after
 Frans Sillanpää (writer)[2]
1938 BA · 1935 GB
1952 HQ3 · 1955 DQ
1965 EA
main-belt · Flora [3]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 78.23 yr (28573 days)
Aphelion 2.4730 AU (369.96 Gm)
Perihelion 2.0178 AU (301.86 Gm)
2.2454 AU (335.91 Gm)
Eccentricity 0.10138
3.36 yr (1229.0 d)
39.573°
0° 17m 34.548s / day
Inclination 5.2572°
17.549°
196.20°
Earth MOID 1.01186 AU (151.372 Gm)
Jupiter MOID 2.49307 AU (372.958 Gm)
Jupiter Tisserand parameter 3.619
Physical characteristics
Dimensions 8.763±0.063 km[4]
7.35±0.29 km[5]
8.19 km (calculated)[3]
9.6602 h (0.40251 d)[lower-alpha 1][1]
9.659±0.001 h[6]
9.65855±0.00005 h[7]
9.6597±0.0172 h[8]
0.2109±0.0108[4]
0.327±0.080[5]
0.24 (assumed)[3]
S [3]
12.6

    1446 Sillanpää, provisional designation 1938 BA, is a stony asteroid from the inner regions of the asteroid belt, about 8 kilometers in diameter. It was discovered by Finnish astronomer Yrjö Väisälä at Turku Observatory on 26 January 1938.[9]

    The asteroid is a member of the Flora family, a large group of S-type asteroids dwelling in the inner main-belt. It orbits the Sun at a distance of 2.0–2.5 AU once every 3 years 4 months (1,229 days). Its orbit shows an eccentricity of 0.10 and is tilted by 5 degrees to the plane of the ecliptic. It has a rotation period of 9.66 hours[lower-alpha 1][7][8] and an albedo of about 0.25, based on observations by the WISE and subsequent NEOWISE surveys.[4][5]

    The minor planet was named after one of the most famous Finnish writers, Frans Eemil Sillanpää (1888–1964), first Finnish writer to receive the Nobel Prize in Literature in 1939 (also see List of Laureates since 1901).[2]

    References

    1. 1 2 Pravec (2009) web: rotation period 9.6602±0.0008 hours with a brightness amplitude of 0.55 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (1446) Sillanpaa
    1. 1 2 3 "JPL Small-Body Database Browser: 1446 Sillanpaa (1938 BA)" (2015-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 27 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1446) Sillanpää. Springer Berlin Heidelberg. p. 116. ISBN 978-3-540-29925-7. Retrieved 19 November 2015.
    3. 1 2 3 4 "LCDB Data for (1446) Sillanpaa". Asteroid Lightcurve Database (LCDB). Retrieved 19 November 2015.
    4. 1 2 3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 19 November 2015.
    5. 1 2 3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 19 November 2015.
    6. ↑ Galad, Adrian (October 2009). "Byproduct Targets During Photometric Observations from Modra". The Minor Planet Bulletin. 36 (4): 183–186. Bibcode:2009MPBu...36..183G. ISSN 1052-8091. Retrieved 19 November 2015.
    7. 1 2 Hanus, J.; Broz, M.; Durech, J.; Warner, B. D.; Brinsfield, J.; et al. (November 2013). "An anisotropic distribution of spin vectors in asteroid families". Astronomy & Astrophysics. 559: 19. arXiv:1309.4296Freely accessible. Bibcode:2013A&A...559A.134H. doi:10.1051/0004-6361/201321993. Retrieved 19 November 2015.
    8. 1 2 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041Freely accessible. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 19 November 2015.
    9. ↑ "1446 Sillanpaa (1938 BA)". Minor Planet Center. Retrieved 19 November 2015.

    External links


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