1447 Utra

1447 Utra
Discovery [1]
Discovered by Y. Väisälä
Discovery site Turku Observatory
Discovery date 26 January 1938
Designations
MPC designation 1447 Utra
Named after
 Utra
(discoverer's birthplace)[2]
1938 BB · 1936 SB
1951 KO · A918 FA
main-belt · (inner) [3]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 74.13 yr (27077 days)
Aphelion 2.6403 AU (394.98 Gm)
Perihelion 2.4288 AU (363.34 Gm)
2.5346 AU (379.17 Gm)
Eccentricity 0.041726
4.04 yr (1473.8 d)
187.74°
0° 14m 39.336s / day
Inclination 4.7865°
35.529°
64.308°
Earth MOID 1.44857 AU (216.703 Gm)
Jupiter MOID 2.41359 AU (361.068 Gm)
Jupiter Tisserand parameter 3.443
Physical characteristics
Dimensions 11.83±0.86 km[4]
12.634±0.103 km[5]
13.26±0.53 km[6]
13.58 km (calculated)[3]
257±30 h,[lower-alpha 1] 257 h (10.7 d)[1]
0.381±0.058[4]
0.3381±0.0591[5]
0.303±0.038[6]
0.20 (assumed)[3]
S [3]
11.7

    1447 Utra, provisional designation 1938 BB, is a stony asteroid and slow rotator from the inner regions of the asteroid belt, about 13 kilometers in diameter. It was discovered by Finnish astronomer Yrjö Väisälä at Turku Observatory on 26 January 1938.[7]

    The S-type asteroid orbits the Sun at a distance of 2.4–2.6 AU once every 4.04 years (1,474 days). Its orbit shows an eccentricity of 0.04 and is tilted by 5 degrees to the plane of the ecliptic. It has a very long rotation period of 257±30 hours[lower-alpha 1] and an albedo of 0.38 and 0.30, according to the results from the Akari and Wide-field Infrared Survey Explorer missions, respectively.[4][5][6]

    The minor planet was named after the northeastern Finnish town, Utra, birthplace of the discoverer.[2]

    References

    1. 1 2 Martinez (2011) web: rotation period 257±30 hours with a brightness amplitude of 0.63 mag. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (1447) Utra
    1. 1 2 3 "JPL Small-Body Database Browser: 1447 Utra (1938 BB)" (2015-07-12 last obs.). Jet Propulsion Laboratory. Retrieved 27 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1447) Utra. Springer Berlin Heidelberg. p. 116. ISBN 978-3-540-29925-7. Retrieved November 2015.
    3. 1 2 3 4 "LCDB Data for (1447) Utra". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
    4. 1 2 3 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; 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 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:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved November 2015.
    6. 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:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved November 2015.
    7. ↑ "1447 Utra (1938 BB)". Minor Planet Center. Retrieved November 2015.

    External links


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