1529 Oterma

1529 Oterma
Discovery [1]
Discovered by Y. Väisälä
Discovery site Turku Obs.
Discovery date 26 January 1938
Designations
MPC designation 1529 Oterma
Named after
 Liisi Oterma
(astronomer)[2]
1938 BC · 1950 PV
1959 RD1 · A912 VO
main-belt (outer) · Hilda [3]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 65.59 yr (23,957 days)
Aphelion 4.7970 AU
Perihelion 3.1919 AU
3.9945 AU
Eccentricity 0.2009
7.98 yr (2,916 days)
1.0168°
0° 7m 24.6s / day
Inclination 9.0567°
100.60°
295.16°
Jupiter MOID 0.81 AU
Physical characteristics
Dimensions 54.40 km (calculated)[3]
60.16±1.11 km[4]
15.75 h[5]
0.047±0.002[4]
0.057 (assumed)[3]
B–V = 0.764[1]
U–B = 0.386[1]
Tholen = P [1] · P [3]
10.05[1][3][4]
10.11±0.26[6]

    1529 Oterma, provisional designation 1938 BC, is a reddish, rare-type Hildian asteroid from the outermost region of the asteroid belt, approximately 60 kilometers in diameter. It was discovered by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland on 26 January 1938.[7]

    The carbonaceous body belongs to an exclusive group of 33 known asteroids with a spectral P-type in the Tholen classification scheme.[8] It is a member of the Hilda family, a large group of asteroids that orbit in resonance with the gas giant Jupiter. Hildian asteroids are thought to have originated from the Kuiper belt in the outer Solar System.

    Orbit of 1529 Oterma

    It orbits the Sun at a distance of 3.2–4.8 AU once every 7 years and 12 months (2,916 days). Its orbit has an eccentricity of 0.20 and an inclination of 9° with respect to the ecliptic.[1] The first used observation was taken at the discovering observatory in February 1938 and the asteroid's observation arc begins 3 weeks after its official discovery observation.[7]

    In the 1990s, during a study of 47 Hilda asteroids, a rotational light-curve was obtained for this asteroid from photometric observations taken at the Swedish Uppsala Astronomical Observatory and other places. It gave a rotation period of 15.75 hours with a brightness amplitude of 0.18 in magnitude (U=2).[5]

    According to the space-based survey carried out by the Japanese Akari satellite, the asteroid measures 60.1 kilometers in diameter and its surface has an albedo of 0.047,[4] while the Collaborative Asteroid Lightcurve Link assumes an standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 54.4 kilometers, based on an absolute magnitude of 10.05.[3]

    It was named after Liisi Oterma (1915–2001), first Finnish female astronomer with a Ph.D. and a discoverer of minor planets and comets at the Turku observatory between 1939 and 1953.[2] Naming citation was published before November 1977 (M.P.C. 3929).[9]

    References

    1. 1 2 3 4 5 6 7 "JPL Small-Body Database Browser: 1529 Oterma (1938 BC)" (2016-01-26 last obs.). Jet Propulsion Laboratory. Retrieved 16 August 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1529) Oterma. Springer Berlin Heidelberg. p. 121. ISBN 978-3-540-00238-3. Retrieved 16 August 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (1529) Oterma". Asteroid Lightcurve Database (LCDB). Retrieved 16 August 2016.
    4. 1 2 3 4 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" (PDF). Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 16 August 2016.
    5. 1 2 Dahlgren, M.; Lahulla, J. F.; Lagerkvist, C.-I.; Lagerros, J.; Mottola, S.; Erikson, A.; et al. (June 1998). "A Study of Hilda Asteroids. V. Lightcurves of 47 Hilda Asteroids". Icarus. 133 (2): 247–285. Bibcode:1998Icar..133..247D. doi:10.1006/icar.1998.5919. Retrieved 16 August 2016.
    6. ↑ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 16 August 2016.
    7. 1 2 "1529 Oterma (1938 BC)". Minor Planet Center. Retrieved 16 August 2016.
    8. ↑ "JPL Small-Body Database – Query spectral type P (Tholen)". JPL Solar System Dynamics. Retrieved 16 August 2016.
    9. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 16 August 2016.

    External links

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