1180 Rita

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1180 Rita
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date9 April 1931
Designations
(1180) Rita
Named after
unknown [2]
1931 GE ·1929 CM
1953 AH ·1957 UF1
A907 GG ·A908 KA
A916 LA
main-belt  ·(outer) [1]  · Hilda [3] [4]
Orbital characteristics [1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 109.98 yr (40,172 days)
Aphelion 4.6127 AU
Perihelion 3.3574 AU
3.9851 AU
Eccentricity 0.1575
7.96 yr (2,906 days)
209.15°
0° 7m 26.04s / day
Inclination 7.1985°
88.336°
209.12°
Jupiter  MOID 0.6111 AU
Physical characteristics
Mean diameter
82.72 km (calculated) [4]
97 km [1]
97.63±2.30 km [5]
9 h [6]
9.605±0.006 h [7]
12 h [8]
13.090±0.002 h [lower-alpha 1]
14.72 h [9]
14.902 h [10]
20.496±0.005 h [lower-alpha 2]
0.041±0.002 [5]
0.044±0.008 [11]
0.048 [1]
0.057 (assumed) [4]
0.058±0.009 [12]
Tholen = P [1]  · P [4] [11]
B–V = 0.682 [1]  ·0.670±0.010 [lower-alpha 2]
U–B = 0.216 [1]
V–R = 0.440±0.010 [lower-alpha 2]
9.14 [1] [4] [5]  ·9.17±0.19 [13]

    1180 Rita, provisional designation 1931 GE, is a dark and spheroidal Hildian asteroid from the outermost regions of the asteroid belt, approximately 97 kilometers in diameter. It was discovered on 9 April 1931, by German astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany. [3] Any reference of its later name, Rita, is unknown. [2]

    Contents

    Orbit and classification

    Rita belongs to the orbital Hilda group which is located in the outermost part of the main-belt. [4] Asteroids in this dynamical group have semi-major axis between 3.7 and 4.2  AU and stay in a 3:2 resonance with the gas giant Jupiter. Rita, however, is a background asteroid and not a member of the (collisional) Hilda family ( 101 ). [14] Hildian asteroids are thought to have originated from the Kuiper belt.

    The asteroid orbits the Sun at a distance of 3.4–4.6  AU once every 7 years and 12 months (2,906 days). Its orbit has an eccentricity of 0.16 and an inclination of 7° with respect to the ecliptic. [1]

    It was first observed as A907 GG at Heidelberg in 1907. The body's observation arc begins at Heidelberg in 1908, when it was identified as A908 KA, approximately 23 years prior to its official discovery observation. [3]

    Physical characteristics

    In the Tholen taxonomy, Rita is a dark and reddish P-type asteroid. [1] The P-type asteroids are some of the darkest objects in the Solar System.

    Rotation period

    Since 1983, several rotational lightcurves of Rita have been obtained from photometric observations. Lightcurve analysis gave a wide range of divergent rotation periods between 9 and 20.5 hours. [6] [7] [8] [9] [10] [lower-alpha 2] The Light Curve Data Base adopts a period of 13.090 hours with a brightness amplitude of 0.06 magnitude. Bodies with such a low brightness variation are typically of a spherical rather than elongated shape. The lightcurve was obtained in January 2017, by American astronomer Brian Warner at the Center for Solar System Studies in California ( U=2 ). [lower-alpha 1]

    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, Rita measures 97 kilometers in diameter and its surface has an albedo between 0.041 and 0.058. [5] [11] [12] The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous, outer main-belt asteroids of 0.057, and calculates a diameter of 82.72 kilometers with on an absolute magnitude of 9.14. [4]

    Naming

    Any reference of this minor planet's name to a person or occurrence is unknown. [2]

    Unknown meaning

    Among the many thousands of named minor planets, Rita is one of 120 asteroids, for which no official naming citation has been published. All of these low-numbered asteroids have numbers between 164 Eva and 1514 Ricouxa and were discovered between 1876 and the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth. [15]

    Notes

    1. 1 2 Warner (2017) web: lightcurve plot of 1180 Rita – rotation period 13.090±0.002 hours with a brightness amplitude of 0.06±0.01 magnitude. No quality code of 2. Observed between 12 December 2016 and 26 January 2017, with a total of 304 data points. Summary figures at the Light Curve Data Base.
    2. 1 2 3 4 Slyusarev (2012) web: rotation period 20.496±0.005 hours with a brightness amplitude of 0.05 magnitude. No quality code determined. Color Indices for BV and VR are 0.670±0.010 and 0.440±0.010, respectively. Summary figures at the Light Curve Data Base.

    Related Research Articles

    1038 Tuckia, provisional designation 1924 TK, is rare-type Hilda asteroid from the outermost regions of the asteroid belt, approximately 58 kilometers in diameter. It was discovered on 24 November 1924, by German astronomer by Max Wolf at Heidelberg Observatory in southwest Germany. The asteroid was named after American banker Edward Tuck and his wife.

    1144 Oda, provisional designation 1930 BJ, is a dark Hildian asteroid from the outermost regions of the asteroid belt, approximately 57 kilometers in diameter. It was discovered on 28 January 1930, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory. The asteroid's name is a German female name, not related to the discoverer's contemporaries.

    1162 Larissa, provisional designation 1930 AC, is a metallic Hildian asteroid from the outermost regions of the asteroid belt, approximately 43 kilometers in diameter. It was discovered on 5 January 1930, by astronomer German astronomer Karl Reinmuth at Heidelberg Observatory in southwest Germany. The asteroid was named after the Greek city of Larissa.

    1268 Libya, provisional designation 1930 HJ, is a dark Hildian asteroid from the outer regions of the asteroid belt, approximately 95 kilometers in diameter. It was discovered on 29 April 1930, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg, South Africa. The asteroid was named for the country Libya.

    2067 Aksnes, provisional designation 1936 DD, is a rare-type Hildian asteroid from the outermost region of the asteroid belt, approximately 44 kilometers in diameter. The asteroid was discovered on 23 February 1936, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland. It was named after astronomer Kaare Aksnes.

    2246 Bowell, provisional designation 1979 XH, is a rare-type Hildian asteroid from the outermost region of the asteroid belt, approximately 44 kilometers in diameter. It was discovered on 14 December 1979, by American astronomer Edward Bowell at Lowell Observatory's Anderson Mesa Station, and named after the discoverer himself.

    2312 Duboshin, provisional designation 1976 GU2, is a dark Hildian asteroid from the outermost regions of the asteroid belt, approximately 54 kilometers (34 miles) in diameter. It was discovered on 1 April 1976, by Soviet–Russian astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula. It was named after Russian astronomer Georgij Duboshin. The D-type asteroid has a longer than average rotation period of 50.78 hours.

    1212 Francette, provisional designation 1931 XC, is a dark Hildian asteroid from the outermost regions of the asteroid belt, approximately 82 kilometers in diameter. It was discovered on 3 December 1931, by French astronomer Louis Boyer at the Algiers Observatory in Algeria, North Africa, who named it after his wife Francette Boyer.

    <span class="mw-page-title-main">2483 Guinevere</span>

    2483 Guinevere is a dark and elongated Hilda asteroid from the outermost regions of the asteroid belt, approximately 43 kilometers in diameter. The asteroid was discovered on 17 August 1928, by German astronomer Max Wolf at Heidelberg Observatory in southwest Germany and given the provisional designation 1928 QB. In the 1980s, it was named after King Arthur's wife Guinevere.

    1202 Marina, provisional designation 1931 RL, is a primitive Hildian background asteroid from the outermost regions of the asteroid belt, approximately 55 kilometers in diameter. It was discovered by Grigory Neujmin at the Simeiz Observatory in 1931, and later named in honor of Marina Lavrova–Berg, a scientific collaborator at Pulkovo Observatory, who died at an early age during WWII.

    1877 Marsden, provisional designation 1971 FC, is a carbonaceous Hildian asteroid from the outermost region of the asteroid belt, approximately 35 kilometers in diameter. It was discovered during the Palomar–Leiden Trojan survey in 1971, and named after British astronomer Brian Marsden.

    1748 Mauderli, provisional designation 1966 RA, is a dark and very reddish Hildian asteroid from the outermost region of the asteroid belt, approximately 45 kilometers in diameter.

    1529 Oterma, provisional designation 1938 BC, is a reddish, rare-type Hildian asteroid from the outermost region of the asteroid belt, approximately 56 kilometers in diameter. It was discovered on 26 January 1938, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland. It is named for Liisi Oterma.

    <span class="mw-page-title-main">1512 Oulu</span>

    1512 Oulu, provisional designation 1939 FE, is a dark Hildian asteroid, slow rotator and possibly the largest known tumbler orbiting in the outermost region of the asteroid belt. With a diameter of approximately 80 kilometers, it belongs to the fifty largest asteroids in the outer main-belt. The body was discovered on 18 March 1939, by Finnish astronomer Heikki Alikoski at Turku Observatory in Southwest Finland and named for the Finnish town Oulu.

    1345 Potomac, provisional designation 1908 CG, is a dark Hildian asteroid from the outermost regions of the asteroid belt, approximately 73 kilometers (45 mi) in diameter. It was discovered on 4 February 1908, by American astronomer Joel Metcalf at the Taunton Observatory in Massachusetts, United States. The X-type asteroid has a rotation period of 11.4 hours. It was named for the Potomac River on which Washington, D.C. is located.

    2959 Scholl, provisional designation 1983 RE2, is a carbonaceous Hildian asteroid from the outer regions of the asteroid belt, approximately 34 kilometers in diameter. It was discovered on 4 September 1983 by English–American astronomer Edward Bowell of the Lowell Observatory at Anderson Mesa Station near Flagstaff, Arizona. The asteroid was named after German astronomer Hans Scholl.

    1911 Schubart, provisional designation 1973 UD, is a dark Hildian asteroid and parent body of the Schubart family, located in the outermost region of the asteroid belt, approximately 70 kilometers in diameter. It was discovered on 25 October 1973, by Swiss astronomer Paul Wild at Zimmerwald Observatory, near Bern, Switzerland. The asteroid was named after German astronomer Joachim Schubart.

    <span class="mw-page-title-main">1902 Shaposhnikov</span>

    1902 Shaposhnikov is a dark Hilda asteroid from the outermost region of the asteroid belt, approximately 92 kilometers in diameter. It was discovered on 18 April 1972, by Russian astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula. The asteroid was named after Soviet astronomer and WWII casualty Vladimir Shaposhnikov. It was one of the last larger asteroids discovered in the main belt.

    1941 Wild, provisional designation 1931 TN1, is an eccentric Hildian asteroid from the outermost region of the asteroid belt, approximately 20 kilometers in diameter.

    1439 Vogtia, provisional designation 1937 TE, is a dark Hildian asteroid from the outermost region of the asteroid belt, approximately 48 kilometers in diameter. It was discovered on 11 October 1937, by German astronomer Karl Reinmuth at Heidelberg Observatory in southern Germany. It is named for astronomer Heinrich Vogt.

    References

    1. 1 2 3 4 5 6 7 8 9 10 11 "JPL Small-Body Database Browser: 1180 Rita (1931 GE)" (2017-03-29 last obs.). Jet Propulsion Laboratory . Retrieved 27 April 2017.
    2. 1 2 3 Schmadel, Lutz D. (2007). "(1180) Rita". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 99. doi:10.1007/978-3-540-29925-7_1181. ISBN   978-3-540-00238-3.
    3. 1 2 3 "1180 Rita (1931 GE)". Minor Planet Center. Retrieved 27 April 2017.
    4. 1 2 3 4 5 6 7 "LCDB Data for (1180) Rita". Asteroid Lightcurve Database (LCDB). Retrieved 27 April 2017.
    5. 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)
    6. 1 2 Binzel, Richard P.; Sauter, Linda M. (February 1992). "Trojan, Hilda, and Cybele asteroids - New lightcurve observations and analysis". Icarus. 95 (2): 222–238. Bibcode:1992Icar...95..222B. doi:10.1016/0019-1035(92)90039-A. ISSN   0019-1035 . Retrieved 27 April 2017.
    7. 1 2 Polishook, David (October 2012). "Lightcurves for Shape Modeling: 852 Wladilena, 1089 Tama, and 1180 Rita". The Minor Planet Bulletin. 39 (4): 242–244. Bibcode:2012MPBu...39..242P. ISSN   1052-8091 . Retrieved 27 April 2017.
    8. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (1180) Rita". Geneva Observatory . Retrieved 27 April 2017.
    9. 1 2 Gonano, M.; Mottola, S.; Neukum, G.; di Martino, M. (December 1990). "Physical study of outer belt asteroids". Space Dust and Debris; Proceedings of the Topical Meeting of the Interdisciplinary Scientific Commission B /Meetings B2. 11 (12): 197–200. Bibcode:1991AdSpR..11..197G. doi:10.1016/0273-1177(91)90563-Y. ISSN   0273-1177 . Retrieved 27 April 2017.
    10. 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 27 April 2017.
    11. 1 2 3 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. S2CID   35447010.
    12. 1 2 Grav, T.; Mainzer, A. K.; Bauer, J.; Masiero, J.; Spahr, T.; McMillan, R. S.; et al. (January 2012). "WISE/NEOWISE Observations of the Hilda Population: Preliminary Results". The Astrophysical Journal. 744 (2): 15. arXiv: 1110.0283 . Bibcode:2012ApJ...744..197G. doi:10.1088/0004-637X/744/2/197. S2CID   44000310 . Retrieved 27 April 2017.
    13. ↑ 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. S2CID   53493339 . Retrieved 27 April 2017.
    14. ↑ "Asteroid 1180 Rita – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 28 October 2019.
    15. ↑ Schmadel, Lutz D. (2007). "Appendix 11 – Minor Planet Names with Unknown Meaning". Dictionary of Minor Planet Names – Fifth Revised and Enlarged revision. Springer Berlin Heidelberg. pp. 927–929. ISBN   978-3-540-00238-3.
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