Discovery [1] | |
---|---|
Discovered by | A. Deutsch |
Discovery site | Simeiz Obs. |
Discovery date | 5 July 1929 |
Designations | |
(1148) Rarahu | |
Named after | Rarahu (based on a French novel by Pierre Loti) [2] |
1929 NA ·A924 OA | |
main-belt ·(outer) Eos [3] [4] | |
Orbital characteristics [1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 87.98 yr (32,135 days) |
Aphelion | 3.3477 AU |
Perihelion | 2.6909 AU |
3.0193 AU | |
Eccentricity | 0.1088 |
5.25 yr (1,916 days) | |
278.28° | |
0° 11m 16.44s / day | |
Inclination | 10.827° |
145.43° | |
174.80° | |
Physical characteristics | |
Dimensions | 26.311±0.283 km [5] 27.512±0.371 km [6] 32.81±0.56 km [7] 33.23±2.9 km [8] 49.11±0.64 km [9] |
6.54±0.05 h [10] 6.54448±0.00002 h [11] [lower-alpha 1] 6.54449±0.00005 h [12] 6.5447±0.0006 h [10] | |
0.064±0.015 [9] 0.1393±0.028 [8] 0.177±0.007 [7] 0.2205±0.0616 [5] | |
Tholen = S [1] SMASS = K [1] [3] B–V = 0.868 [1] U–B = 0.444 [1] | |
10.15 [1] [3] [5] [7] [8] [9] ·10.46±0.35 [13] | |
1148 Rarahu, provisional designation 1929 NA and previously also known as 1148 Raraju, [lower-alpha 2] is an Eoan asteroid from the outer regions of the asteroid belt, approximately 32 kilometers in diameter. Discovered by Alexander Deutsch at the Simeiz Observatory in 1929, [14] the asteroid's name was taken from a French novel by Pierre Loti. [2]
Rarahu was discovered on 5 July 1929, by Soviet astronomer Alexander Deutsch at the Simeiz Observatory on the Crimean peninsula. [14] On July 28, it was independently discovered by Cyril Jackson and Harry Wood at Johannesburg Observatory in South Africa. [2] The Minor Planet Center only recognizes the first discoverer. [14]
Rarahu is a member the Eos family ( 606 ), [3] [4] the largest asteroid family of the outer main belt, named after its parent body, the asteroid 221 Eos. The family consists of nearly 10,000 asteroids. [15] : 23
It orbits the Sun at a distance of 2.7–3.3 AU once every 5 years and 3 months (1,916 days; semi-major axis of 3.02 AU). Its orbit has an eccentricity of 0.11 and an inclination of 11° with respect to the ecliptic. [1] The asteroid was first observed as A924 OA at Simeiz Observatory on July 1924. The body's observation arc begins at Johannesburg in July 1929, one week after its official discovery observation at Simeiz. [14]
In the Tholen classification, Rarahu is a stony S-type asteroid. [1] In the SMASS classification it is a K-type asteroid, which is a refined spectral type to which most members of the Eos family, including the parent body, belong to. [1] [3]
Between 2002 and 2011, three rotational lightcurves of Rarahu were obtained from photometric observations by French amateur astronomers René Roy, Laurent Brunetto and Pierre Antonini. [10] Lightcurve analysis gave a consolidated rotation period of 6.5447 hours with a brightness amplitude between 0.05 and 0.94 magnitude ( U=3- ). [3] [10]
The asteroid's lightcurve has also been modeled several times and gave a concurring period of 6.54448 and 6.54449 hours, respectively. [11] [12] [lower-alpha 1] The body's spin axis has also been determined to be at (146.0°, −2.0°) and (326.0°, −2.0°) in ecliptic coordinates (λ, β). [11] [lower-alpha 1]
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Rarahu measures between 26.311 and 49.11 kilometers in diameter and its surface has an albedo between 0.064 and 0.2205. [5] [6] [7] [8] [9]
The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.1393 and a diameter of 33.23 kilometers based on an absolute magnitude of 10.15. [3] [8]
This minor planet's name was taken from the novel Le mariage de Loti (Loti's Marriage; 1880) by French novelist and naval officer Pierre Loti (1850–1923). The Polynesian idyll was originally titled "Rarahu", which is the Tahitian name for a girl. The official naming citation that already correctly spelled the asteroid's name (see below) was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ( H 107 ). [2]
In the original publication, the German journal Astronomische Nachrichten incorrectly spelled this minor planet's name as "Raraju" rather than "Rarahu", which is the original French spelling, due to an error in the transliteration process from French to Russian and then to German. The officially corrected name was published by the Minor Planet Center on 27 December 1985 ( M.P.C. 10194). [16] [lower-alpha 2]
749 Malzovia is a stony background asteroid from the inner regions of the asteroid belt, approximately 11 kilometers in diameter. It was discovered on 5 April 1913, by Russian astronomer Sergey Belyavsky at the Simeiz Observatory on the Crimean peninsula. The elongated S-type asteroid has a rotation period of 5.9 hours. It was named after Russian amateur astronomer Nikolai Maltsov who founded the discovering Simeïs Observatory in 1900.
952 Caia is a carbonaceous background asteroid from the outer region of the asteroid belt, approximately 82 kilometers in diameter. It was discovered by Soviet–Russian astronomer Grigory Neujmin at the Crimean Simeiz Observatory on 27 October 1916 and given the provisional designation 1916 Σ61. It was named after the heroine in the novel Quo Vadis by Henryk Sienkiewicz.
Lagrangea, provisional designation 1923 OU, is a carbonaceous background asteroid from the outer region of the asteroid belt, approximately 30 kilometers in diameter. It was discovered on 12 September 1923, by Russian astronomer Sergey Belyavsky at the Simeiz Observatory on the Crimean peninsula. The asteroid was named after Italian mathematician and astronomer Joseph-Louis Lagrange.
1388 Aphrodite is an asteroid of the Eos family from the outer regions of the asteroid belt, approximately 22 kilometers in diameter. It was discovered on 24 September 1935, by Belgian astronomer Eugène Delporte at the Royal Observatory of Belgium in Uccle. The likely elongated K-type asteroid has a rotation period of 11.9 hours. It was named after the Greek goddess Aphrodite from Greek mythology.
1057 Wanda, provisional designation 1925 QB, is a carbonaceous background asteroid from the outer region of the asteroid belt, approximately 43 kilometers in diameter. It was discovered by Grigory Shajn at the Simeiz Observatory in 1925, and later named after Polish–Soviet writer Wanda Wasilewska. The asteroid has a rotation period of 28.8 hours.
1075 Helina, provisional designation 1926 SC, is a stony Eos asteroid from the outer regions of the asteroid belt, approximately 34 kilometers in diameter. It was discovered on 29 September 1926, by astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The asteroid was named after the discoverer's son, Helij Neujmin.
1099 Figneria, provisional designation 1928 RQ, is an asteroid from the background population of the outer regions of the asteroid belt, approximately 26 kilometers in diameter. Discovered by Grigory Neujmin at Simeiz Observatory in 1928, the asteroid was later named after Russian revolutionary activist Vera Figner.
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.
1120 Cannonia, provisional designation 1928 RV, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 10 kilometers in diameter. Discovered by Pelageya Shajn at Simeiz in 1928, it was named after American astronomer Annie Jump Cannon.
1129 Neujmina is an Eos asteroid from the outer regions of the asteroid belt. It was discovered on 8 August 1929, by astronomer Praskoviya Parchomenko at the Simeiz Observatory on the Crimean peninsula. The stony S-type asteroid has a rotation period of 5.1 hours and measures approximately 34 kilometers in diameter. It was named after Soviet astronomer Grigory Neujmin.
1137 Raïssa is a stony background asteroid and slow rotator, approximately 22 kilometers in diameter, located in the inner regions of the asteroid belt. It was discovered by Grigory Neujmin at Simeiz Observatory in 1929, and named in memory of Raïssa Maseeva, who worked at the Pulkovo Observatory.
1188 Gothlandia, provisional designation 1930 SB, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 12 kilometers in diameter. Discovered by astronomer Josep Comas i Solà at the Fabra Observatory in 1930, the asteroid was later named after the ancient name of the Spanish autonomous community of Catalonia.
1379 Lomonosowa is a stony background asteroid from the central regions of the asteroid belt, approximately 19 kilometers in diameter. Discovered by Grigory Neujmin at the Simeiz Observatory in 1936, the asteroid was later named after Russian physicist and astronomer Mikhail Lomonosov.
1353 Maartje, provisional designation 1935 CU, is an Eoan asteroid from the outer regions of the asteroid belt, approximately 37 kilometers in diameter. It was discovered on 13 February 1935, by Dutch astronomer Hendrik van Gent at the Union Observatory in Johannesburg, South Africa. The asteroid was named after Maartje Mekking, daughter of a staff member at the Dutch Leiden Observatory.
1605 Milankovitch, provisional designation 1936 GA, is an Eoan asteroid from the outer region of the asteroid belt, approximately 31 kilometers in diameter. It was named after Serbian scientist Milutin Milanković.
1297 Quadea, provisional designation 1934 AD, is an Eoan asteroid from the outer regions of the asteroid belt, approximately 23 kilometers in diameter. It was discovered on 7 January 1934, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in Germany. The asteroid was named for the parents-in-law of the discoverer's brother.
1350 Rosselia, provisional designation 1934 TA, is a stony Koronian asteroid from the outer regions of the asteroid belt, approximately 22 kilometers in diameter. Discovered by astronomer Eugène Delporte at the Royal Observatory of Belgium in 1934, the asteroid was later named after Marie-Thérèse Rossel, editor of the Belgian newspaper Le Soir.
1330 Spiridonia, provisional designation 1925 DB, is a dark background asteroid of primitive composition, located in the outer regions of the asteroid belt, approximately 65 kilometers in diameter. It was discovered on 17 February 1925, by Soviet astronomer Vladimir Albitsky at the Simeiz Observatory on the Crimean peninsula. The asteroid was named after the discoverer's brother-in-law, Spiridon Zaslavskij.
1339 Désagneauxa, provisional designation 1934 XB, is a stony Eoan asteroid from the outer region of the asteroid belt, approximately 24 kilometers in diameter. It was discovered on 4 December 1934, by French astronomer Louis Boyer at the North African Algiers Observatory in Algeria. A few nights later, the asteroid was independently discovered by astronomers Grigory Neujmin and Eugène Delporte, at the Crimean Simeiz and Belgian Uccle Observatory, respectively. It was later named after discoverer's brother-in-law.
1535 Päijänne, provisional designation 1939 RC, is an asteroid from the outer region of the asteroid belt, approximately 25 kilometers in diameter. It was discovered on 9 September 1939, by Finnish astronomer Yrjö Väisälä at the Turku Observatory in Southwest Finland. It was later named for Lake Päijänne.