Discovery [1] | |
---|---|
Discovered by | J. Palisa |
Discovery site | Vienna Obs. |
Discovery date | 21 October 1911 |
Designations | |
(725) Amanda | |
Pronunciation | German: [aːˈmandaː] [2] |
Named after | Amanda Schorr, wife of Richard Schorr (1867–1951) (German astronomer) [3] |
A911 UQ ·2016 FH6 1911 ND | |
Orbital characteristics [4] | |
Epoch 31 May 2020 (JD 2459000.5) | |
Uncertainty parameter 0 | |
Observation arc | 104.58 yr (38,198 d) |
Aphelion | 3.1422 AU |
Perihelion | 2.0022 AU |
2.5722 AU | |
Eccentricity | 0.2216 |
4.13 yr (1,507 d) | |
114.51° | |
0° 14m 20.04s / day | |
Inclination | 3.7902° |
68.679° | |
323.36° | |
Physical characteristics | |
Mean diameter | |
3.749 h [12] | |
Pole ecliptic latitude | |
725 Amanda ( prov. designation:A911 UQor1911 ND) is a dark background asteroid, approximately 22 kilometers (14 miles) in diameter, that is located in the central regions of the asteroid belt. It was discovered by Austrian astronomer Johann Palisa at the Vienna Observatory on 21 October 1911. [1] The carbonaceous C-type asteroid (CSU/C0) has a short rotation period of 3.7 hours. It was named after Amanda Schorr, wife of German astronomer Richard Schorr (1867–1951). [3]
Amanda is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements. [5] [6] [7] It orbits the Sun in the central asteroid belt at a distance of 2.0–3.1 AU once every 4 years and 2 months (1,507 days; semi-major axis of 2.57 AU). Its orbit has an eccentricity of 0.22 and an inclination of 4° with respect to the ecliptic. [4] The body's observation arc begins at Vienna Observatory on 29 September 1915, almost four years after its official discovery observation. [1]
This minor planet was named after Amanda Ruth Smith, born to John and Ruth Smith of Jackson, MS.(May 1980). Amanda(human) was named for the song "Amanda" by Waylon Jennings. Her mother always said that she chose that name because she, like the song verse was always "Amanda light of my life." [3] In 2010, Ruth Smith made the first ever arrangement with NASA to legally purchase the minor planet, "Amanda U1911" for an undisclosed sum of money(USD) and exclusively owns all rights to it. Amanda Ruth Smith (human) was given a certified certificate of ownership by NASA with the serial number "SHMILY-12.0522."©
In the Tholen classification, Amanda's spectral type is closest to that of a carbonaceous C-type asteroid, yet also somewhat similar to a stony S-type with an "unusual" spectrum (CSU). [4] In the taxonomy by Barucci (1987), the asteroid is a dark C-type (C0). [6]
A rotational lightcurve of Amanda was obtained from photometric observations by European astronomers at the La Silla Observatory before 1995. Lightcurve analysis gave a well-defined rotation period of 3.749 hours with a brightness variation of 0.35 magnitude ( U=3 ). [12]
In October 2010, French amateur astronomer Maurice Audejean ( B92 ) determined a concurring period of (3.7431±0.0003) hours with an amplitude of (0.42±0.01) magnitude ( U=3 ), [13] while in August 2018, a further observation by the TESS-team reported a period of (3.74301±0.00005) hours and an amplitude of (0.27±0.05) magnitude ( U=2 ). [14]
In 2016, a modeled lightcurve gave a sidereal period of 3.74311±0.00002 hours using data from the Uppsala Asteroid Photometric Catalogue, the Palomar Transient Factory survey, and individual observers, as well as sparse-in-time photometry from the NOFS, the Catalina Sky Survey, and the La Palma surveys ( 950 ). The study also determined two spin axes of (145.0°, −63.0°) and (320.0°, −70.0°) in ecliptic coordinates (λ, β). [15]
According to the surveys carried out by the Japanese Akari satellite, the Infrared Astronomical Satellite IRAS, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Amanda measures (20.49±0.28), (21.51±2.2) and (23.687±0.215) in diameter and its surface has an albedo of (0.082±0.003), (0.0721±0.017) and (0.068±0.015), respectively. [8] [9] [10] [11]
The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0824 and calculates a diameter of 21.56 kilometers based on an absolute magnitude of 11.66. [16] Alternative mean-diameters published by the WISE team include (19.53±6.07 km ), (21.68±6.40 km), (23.286±0.149 km) and (30.73±4.85 km) with a corresponding albedo of (0.08±0.04), (0.055±0.037), (0.0509±0.0052) and (0.03±0.03). [6] [16]
716 Berkeley is a background asteroid from the central regions of the asteroid belt. It was discovered by Austrian astronomer Johann Palisa at the Vienna Observatory on 30 July 1911. The stony S-type asteroid has a rotation period of 15.6 hours and measures approximately 21 kilometers in diameter. It was named after the city of Berkeley, California, where the discoverer's colleague Armin Otto Leuschner (1868–1953) was the director of the local observatory.
717 Wisibada is a dark background asteroid from the outer regions of the asteroid belt. It was discovered on 26 August 1911, by German astronomer Franz Kaiser at the Heidelberg-Königstuhl State Observatory in southwest Germany. The D-type asteroid measures approximately 29 kilometers in diameter with no rotation period yet determined. It was named after the discoverer's birthplace, the city of Wiesbaden in Hesse, Germany.
722 Frieda is a bright background asteroid and slow rotator from the inner regions of the asteroid belt. It was discovered by Austrian astronomer Johann Palisa at the Vienna Observatory on 18 October 1911. The stony S-type asteroid has a notably long rotation period of 131.1 hours and measures approximately 9 kilometers in diameter. It was named after Frieda Hillebrand, daughter of Austrian astronomer Karl Hillebrand (1861–1939), and grand-daughter of Edmund Weiss (1837–1917) who had been the director of the discovering observatory.
745 Mauritia is a dark background asteroid from the outer regions of the asteroid belt, approximately 24 kilometers in diameter. It was discovered on 1 March 1913, by German astronomer Franz Kaiser at the Heidelberg-Königstuhl State Observatory in Germany. The presumed carbonaceous C-type asteroid has a rotation period of 9.9 hours. It was named after Saint Maurice, patron of the Saint Mauritius church in the city of Wiesbaden, where the discoverer was born.
748 Simeïsa is a very large Hilda asteroid from the outermost regions of the asteroid belt, approximately 104 kilometers in diameter. It was discovered on 14 March 1913, by Russian astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The dark P-type asteroid has a rotation period of 11.9 hours and a shape that is reminiscent of a tetrahedron. It was the first asteroid discovery made in Russia and named after the discovering observatory and its nearby Crimean town, Simeiz.
783 Nora is a dark background asteroid from the inner regions of the asteroid belt. It was discovered by Austrian astronomer Johann Palisa at the Vienna Observatory on 18 March 1914. The carbonaceous C-type asteroid has a longer-than average rotation period of 55.5 hours and measures approximately 40 kilometers in diameter. It was likely named after Nora Helmer, principal character in the play A Doll's House by Norwegian poet Henrik Ibsen.
794 Irenaea is a dark background asteroid from the outer regions of the asteroid belt. It was discovered on 27 August 1914, by Austrian astronomer Johann Palisa at the Vienna Observatory. The presumed C-type asteroid has a rotation period of 9.1 hours and measures approximately 36 kilometers in diameter. It was likely named after Irene Hillebrand, daughter of Austrian astronomer Edmund Weiss (1837–1917).
830 Petropolitana is a bright background asteroid from the outer regions of the asteroid belt. It was discovered on 25 August 1916, by Russian astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The stony S-type asteroid has a long rotation period of 39.0 hours and measures approximately 41 kilometers in diameter. It was named after the Russian city of Saint Petersburg.
866 Fatme is a large background asteroid, approximately 86 kilometers in diameter, located in the outer region of the asteroid belt. It was discovered by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory on 25 February 1917. The X-type asteroid has a short rotation period of 5.8 hours. It was named after "Fatme", a character in the opera Abu Hassan by Carl Maria von Weber (1786–1826).
993 Moultona, provisional designation 1923 NJ, is a Koronian asteroid from the outer regions of the asteroid belt, approximately 14 kilometers in diameter. It was discovered on 12 January 1923, by astronomer George Van Biesbroeck at the Yerkes Observatory in Williams Bay, Wisconsin, in the United States. The likely elongated asteroid has a rotation period of 5.3 hours. It was named after American astronomer Forest Ray Moulton.
1018 Arnolda, provisional designation 1924 QM, is a stony asteroid from the central regions of the asteroid belt, approximately 16 kilometers in diameter. It was discovered on 3 March 1924, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in southwest Germany. The asteroid was named after physicist Arnold Berliner.
1113 Katja, provisional designation 1928 QC, is a background asteroid from the outer regions of the asteroid belt, approximately 39 kilometers in diameter. It was discovered by Pelageya Shajn at the Simeiz Observatory in 1928, and named after Ekaterina Iosko, a staff member at the discovering observatory.
1815 Beethoven, provisional designation 1932 CE1, is a carbonaceous background asteroid from the outer regions of the asteroid belt, approximately 30 kilometers (19 miles) in diameter. It was discovered on 27 January 1932, by German astronomer Karl Reinmuth at the Heidelberg Observatory. The uncommon F-type asteroid seems to have a long rotation period of 54 hours (tentative). It was named after Ludwig van Beethoven.
3247 Di Martino is a dark Nysa family asteroid from the inner regions of the asteroid belt. It was discovered on 30 December 1981, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station near Flagstaff, Arizona, in the United States. The asteroid has a rotation period of 5.4 hours and measures approximately 13 kilometers in diameter. It was named for Italian astronomer Mario di Martino.
1277 Dolores is a carbonaceous background asteroid from the central regions of the asteroid belt, approximately 27 kilometers in diameter. It was discovered on 18 April 1933, by Soviet astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The asteroid was named after Spanish communist Dolores Ibárruri.
1421 Esperanto, provisional designation 1936 FQ, is a dark background asteroid from the outer regions of the asteroid belt, approximately 55 kilometers in diameter. It was discovered on 18 March 1936, by Finnish astronomer Yrjö Väisälä at the Iso-Heikkilä Observatory in Turku, southwest Finland. The presumed C-type asteroid has a rotation period of nearly 22 hours. It was named for the artificial language Esperanto.
1267 Geertruida, provisional designation 1930 HD, is a carbonaceous background asteroid from the inner regions of the asteroid belt, approximately 20 kilometers in diameter. Discovered by astronomer Hendrik van Gent at Johannesburg Observatory in 1930, the asteroid was later named after Geertruid Pels, sister of Dutch astronomer Gerrit Pels.
2140 Kemerovo, provisional designation 1970 PE, is a dark asteroid from the outer region of the asteroid belt, approximately 30 kilometers in diameter.
2672 Písek, provisional designation 1979 KC, is a Eunomia asteroid from the central regions of the asteroid belt, approximately 25 kilometers in diameter. It was discovered on 31 May 1979, by Yugoslav astronomer Jaroslav Květoň at the Kleť Observatory in the Czech Republic. The likely elongated asteroid is a suspected tumbler and a slow rotator with an exceptionally long period of 831 hours. It was named after the Czech town of Písek.
1236 Thaïs is a dark background asteroid from the inner regions of the asteroid belt. The rare T-type asteroid has a notably long rotation period of 72 hours and measures approximately 18 kilometers. It was discovered on 6 November 1931, by Soviet astronomer Grigory Neujmin at Simeiz Observatory on the Crimean peninsula, and named after the ancient Greek prostitute Thaïs.