1691 Oort

Last updated

1691 Oort
1691Oort (Lightcurve Inversion).png
Lightcurve-based 3D-model of Oort
Discovery [1]
Discovered by K. Reinmuth
I. Groeneveld
Discovery site Heidelberg Obs.
Discovery date9 September 1956
Designations
(1691) Oort
Named after
 Jan Oort (astronomer) [2]
1956 RB ·1945 TD
1947 DA ·1950 PZ
1950 RU ·1951 XW
1955 MW ·1956 SD
1964 DA ·A917 TD
main-belt  · Themis [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 71.42 yr (26,086 days)
Aphelion 3.7153 AU
Perihelion 2.6084 AU
3.1618 AU
Eccentricity 0.1750
5.62 yr (2,054 days)
240.25°
Inclination 1.0860°
174.55°
232.69°
Physical characteristics
Dimensions27.13 km (calculated) [3]
33.163±0.534 km [4]
33.644±0.267 [5]
37.37±0.74 km [6]
10.2684±0.0005 h [7]
10.2705±0.0004 h [8]
0.053±0.002 [6]
0.065±0.011 [5]
0.0672±0.0150 [4]
0.10 (assumed) [3]
Tholen = CU [1]  ·CU [3]
B–V = 0.682 [1]
U–B = 0.316 [1]
10.90±0.12 [9]  ·10.95 [1] [3] [4] [6]

    1691 Oort, provisional designation 1956 RB, is a rare-type carbonaceous Themistian asteroid from the outer region of the asteroid belt, approximately 33 kilometers in diameter.

    Contents

    It was discovered on 9 September 1956, by German astronomer Karl Reinmuth and Dutch astronomer Ingrid van Houten-Groeneveld at Heidelberg Observatory in south-west Germany. [10] It was later named after Dutch astronomer Jan Oort. [2]

    Orbit and classification

    is a member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. Oort orbits the Sun at a distance of 2.6–3.7  AU once every 5 years and 7 months (2,054 days). Its orbit has an eccentricity of 0.18 and an inclination of 1° with respect to the ecliptic. [1]

    It was first identified as 1945 TD at Turku in 1945, extending body's observation arc by 14 years prior to its official discovery observation. Information about an earlier 1917-identification, A917 TD, is not available. [10]

    Physical characteristics

    The dark C-type asteroid, classified as a rare intermediate CU-type in the Tholen taxonomy. [1]

    Rotation period

    In February 2009, a rotational lightcurve of Oort was obtained from photometric observations taken by French amateur astronomer René Roy. It gave a well-defined rotation period of 10.2705 hours with a brightness variation of 0.38 magnitude ( U=3 ). [8] An international study from 2013, published a concurring, modeled period of 10.2684 hours ( n.a. ). [7]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Oort measures 33.64 and 37.37 kilometers in diameter, and its surface has an albedo of 0.065 and 0.053, respectively. [4] [5] [6] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.10 and calculates a diameter of 27.13 kilometers with an absolute magnitude of 10.95. [3]

    Naming

    This minor planet was named in honor of Dutch astronomer Jan Oort (1900–1992), director of the Leiden Observatory (1945–1970), president of the International Astronomical Union (1958–1961), and a well-known authority on stellar statistics and galactic structure. [2]

    He overturned the idea that the Sun was at the center of the Milky Way. The Oort cloud, the outermost gravitationally bound region of the Solar System, was also named after him. The official naming citation was published by the Minor Planet Center on 15 February 1970 ( M.P.C. 3023). [11]

    Related Research Articles

    Pawlowia, provisional designation 1923 OX, is a background asteroid from the central regions of the asteroid belt, approximately 20 kilometers in diameter. It was discovered on 5 October 1923, by Soviet astronomer Vladimir Albitsky at the Simeiz Observatory on the Crimean peninsula. The asteroid was named after Russian physiologist and Nobelist Ivan Pavlov.

    La Paz, provisional designation 1923 PD, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 40 kilometers in diameter. It was discovered on 31 October 1923, by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory and named after the city La Paz in Bolivia.

    <span class="mw-page-title-main">1039 Sonneberga</span> Asteroid

    1039 Sonneberga, provisional designation 1924 TL, is a dark background asteroid, approximately 34 kilometers in diameter, located in the central region of the asteroid belt. It was discovered on 24 November 1924, by German astronomer Max Wolf at Heidelberg Observatory in southwest Germany. The asteroid was named for the German city of Sonneberg, where the Sonneberg Observatory is located.

    1049 Gotho, provisional designation 1925 RB, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 53 kilometers in diameter. It was discovered on 14 September 1925, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany. Although the name of the asteroid is a masculine German name, it is not known to refer to a particular individual.

    1070 Tunica, provisional designation 1926 RB, is a dark background asteroid from the outer regions of the asteroid belt, approximately 35 kilometers in diameter. It was discovered on 1 September 1926, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid was named after Petrorhagia, a flowering plant also known as "Tunica".

    <span class="mw-page-title-main">1118 Hanskya</span> Asteroid

    1118 Hanskya is a large background asteroid, approximately 77 kilometers in diameter, located in the outer regions of the asteroid belt. Discovered by Sergey Belyavsky and Nikolaj Ivanov in 1927, it was named after Russian astronomer Aleksey Hansky. The presumed dark C-type asteroid has a rotation period of 15.6 hours.

    1123 Shapleya, provisional designation 1928 ST, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 11 kilometers in diameter. It was discovered on 21 September 1928, by Russian astronomer Grigory Neujmin at Simeiz Observatory on the Crimean peninsula. It was named after American astronomer Harlow Shapley.

    <span class="mw-page-title-main">1132 Hollandia</span> Asteroid

    1132 Hollandia, provisional designation 1929 RB1, is a stony asteroid from the middle region of the asteroid belt, approximately 27 kilometers in diameter. It was discovered on 13 September 1929, by Dutch astronomer Hendrik van Gent at Leiden Southern Station, annex to the Johannesburg Observatory in South Africa. It was named for the region Holland in the Netherlands.

    1567 Alikoski, provisional designation 1941 HN, is a rare-type carbonaceous asteroid from the outer region of the asteroid belt, approximately 67 kilometers in diameter. It was discovered on 22 April 1941, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland. It was later named after Finnish astronomer Heikki Alikoski.

    <span class="mw-page-title-main">1457 Ankara</span> Stony asteroid from the central region of the asteroid belt

    1457 Ankara, provisional designation 1937 PA, is a stony asteroid from the central region of the asteroid belt, approximately 18 kilometers in diameter. It was discovered on 3 August 1937, by German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany, and later named for the Turkish capital city of Ankara.

    1295 Deflotte, provisional designation 1933 WD, is a carbonaceous asteroid from the outer regions of the asteroid belt, approximately 48 kilometers in diameter. It was discovered on 25 November 1933, by French astronomer Louis Boyer at the Algiers Observatory in Algeria, North Africa. The asteroid was named after the discoverer's nephew.

    1736 Floirac, provisional designation 1967 RA, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 8.7 kilometer in diameter.

    1309 Hyperborea is a carbonaceous background asteroid from the outermost regions of the asteroid belt, approximately 57 kilometers in diameter. It was discovered on 11 October 1931, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula, and given the provisional designation 1931 TO. The asteroid was named after Hyperborea, the northern homeland of a Greek mythical race of giants.

    1303 Luthera, provisional designation 1928 FP, is a dark asteroid and the parent body of the Luthera family, located in the outermost regions of the asteroid belt. It measures approximately 90 kilometers in diameter. The asteroid was discovered on 16 March 1928, by astronomer Friedrich Schwassmann at the Bergedorf Observatory in Hamburg, Germany, and later named after German astronomer Robert Luther.

    <span class="mw-page-title-main">1753 Mieke</span> Stony Eos asteroid

    1753 Mieke is a stony Eos asteroid from the outer region of the asteroid belt, approximately 20 kilometers in diameter. It was discovered on 10 May 1934, by Dutch astronomer Hendrik van Gent at the Leiden Southern Station, annex to the Johannesburg Observatory in South Africa. The asteroid was named after Mieke Oort, wife of Dutch astronomer Jan Oort.

    2043 Ortutay, provisional designation 1936 TH, is a dark asteroid from the outer regions of the asteroid belt, approximately 45 kilometers in diameter. The asteroid was discovered by Hungarian astronomer György Kulin at the Konkoly Observatory, Budapest, on 12 November 1936. It was named after Hungarian ethnographer Gyula Ortutay.

    1258 Sicilia, provisional designation 1932 PG, is a dark background asteroid from the outer regions of the asteroid belt, approximately 44 kilometers in diameter. It was discovered on 8 August 1932, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid was named after the Italian island of Sicily.

    1625 The NORC is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 55 kilometers in diameter. It was discovered on 1 September 1953, by Belgian astronomer Sylvain Arend at the Royal Observatory of Belgium in Uccle, Belgium. It was named after the IBM Naval Ordnance Research Calculator (NORC).

    1585 Union, provisional designation 1947 RG, is a dark background asteroid from the outer regions of the asteroid belt, approximately 52 kilometers in diameter. It was discovered on 7 September 1947, by South African astronomer Ernest Johnson at the Union Observatory in Johannesburg, South Africa. The asteroid was named after the discovering observatory.

    1466 Mündleria, provisional designation 1938 KA, is a carbonaceous asteroid from the inner regions of the asteroid belt, approximately 22 kilometers in diameter.

    References

    1. 1 2 3 4 5 6 7 8 "JPL Small-Body Database Browser: 1691 Oort (1956 RB)" (2017-03-17 last obs.). Jet Propulsion Laboratory . Retrieved 6 June 2017.
    2. 1 2 3 Schmadel, Lutz D. (2007). "(1691) Oort". Dictionary of Minor Planet Names – (1691) Oort. Springer Berlin Heidelberg. p. 134. doi:10.1007/978-3-540-29925-7_1692. ISBN   978-3-540-00238-3.
    3. 1 2 3 4 5 6 "LCDB Data for (1691) Oort". Asteroid Lightcurve Database (LCDB). Retrieved 19 December 2016.
    4. 1 2 3 4 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; 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.
    5. 1 2 3 Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv: 1406.6645 . Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121 . Retrieved 19 December 2016.
    6. 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". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
    7. 1 2 Hanus, J.; Broz, M.; Durech, J.; Warner, B. D.; Brinsfield, J.; Durkee, R.; et al. (November 2013). "An anisotropic distribution of spin vectors in asteroid families". Astronomy and Astrophysics. 559: 19. arXiv: 1309.4296 . Bibcode:2013A&A...559A.134H. doi:10.1051/0004-6361/201321993 . Retrieved 19 December 2016.
    8. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1691) Oort". Geneva Observatory . Retrieved 19 December 2016.
    9. ↑ 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: 1506.00762 . Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007 . Retrieved 19 December 2016.
    10. 1 2 "1691 Oort (1956 RB)". Minor Planet Center. Retrieved 19 December 2016.
    11. ↑ Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008) . Springer Berlin Heidelberg. p.  221. doi:10.1007/978-3-642-01965-4. ISBN   978-3-642-01964-7.
    This page is based on this Wikipedia article
    Text is available under the CC BY-SA 4.0 license; additional terms may apply.
    Images, videos and audio are available under their respective licenses.