1757 Porvoo

1757 Porvoo
Discovery [1]
Discovered by Y. Väisälä
Discovery site Turku Observatory
Discovery date 17 March 1939
Designations
MPC designation 1757 Porvoo
Named after
 Porvoo
(Finnish city)[2]
1939 FC · 1964 BB
1968 FK
main-belt · (inner) [3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 76.41 yr (27909 days)
Aphelion 2.6478 AU (396.11 Gm)
Perihelion 2.0551 AU (307.44 Gm)
2.3514 AU (351.76 Gm)
Eccentricity 0.12604
3.61 yr (1317.0 d)
99.254°
0° 16m 24.024s / day
Inclination 3.9765°
39.427°
149.25°
Earth MOID 1.05642 AU (158.038 Gm)
Jupiter MOID 2.30956 AU (345.505 Gm)
Jupiter Tisserand parameter 3.543
Physical characteristics
Dimensions 12.81±0.45 km[4]
10.03±2.85 km[5]
6.32 km (calculated)[3]
4.89 h (0.204 d)[1][6]
0.049±0.004[4]
0.072±0.097[5]
0.20 (assumed)[3]
S [3]
13.36

    1757 Porvoo, provisional designation 1939 FC, is a stony asteroid from the inner regions of the asteroid belt, about 10 kilometers in diameter. It was discovered by Finnish astronomer Yrjö Väisälä at Turku Observatory on the southwestern coast of Finland, on 17 March 1939.[7]

    The asteroid orbits the Sun at a distance of 2.1–2.6 AU once every 3 years and 7 months (1,317 days). Its orbit shows an eccentricity of 0.13 and is tilted by 4 degrees to the plane of the ecliptic. It has a rotation period of 4.89 hours[6] and an albedo of 0.05–0.07 based on observations by the Japanese Akari and the Wide-field Infrared Survey Explorer satellites.[4][5] The Collaborative Asteroid Lightcurve Link (CALL) assumes the body to by an S-type asteroid, despite the fact that the derived, low albedos from the space-based satellite observations are that of a carbonaceous, rather than a silicaceous asteroid.[3]

    The minor planet was named after Porvoo, Finnish city and municipality located on the southern coast of Finland, and east of the capital Helsinki. Porvoo is one of the six medieval towns in Finland, and is its second oldest city after Turku, location of the discovering observatory. In 1809, at the Diet of Porvoo, the Russian czar confirmed that Finland was annexed to the Russian empire as an autonomous nation.[2]

    References

    1. 1 2 3 "JPL Small-Body Database Browser: 1757 Porvoo (1939 FC)" (2015-08-14 last obs.). Jet Propulsion Laboratory. Retrieved 20 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1757) Porvoo. Springer Berlin Heidelberg. p. 140. ISBN 978-3-540-29925-7. Retrieved November 2015.
    3. 1 2 3 4 5 "LCDB Data for (1757) Porvoo". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
    4. 1 2 3 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved November 2015.
    5. 1 2 3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; Cabrera, M. S. (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:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved November 2015.
    6. 1 2 Binzel, R. P.; Mulholland, J. D. (December 1983). "A photoelectric lightcurve survey of small main belt asteroids". Icarus: 519–533. Bibcode:1983Icar...56..519B. doi:10.1016/0019-1035(83)90170-7. ISSN 0019-1035. Retrieved November 2015.
    7. ↑ "1757 Porvoo (1939 FC)". Minor Planet Center. Retrieved November 2015.

    External links


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