Discovery [1] | |
---|---|
Discovered by | M. F. Wolf |
Discovery site | Heidelberg Obs. |
Discovery date | 13 March 1931 |
Designations | |
(1178) Irmela | |
Named after | Irmela Ruska (wife of Ernst Ruska) [2] |
1931 EC ·1940 GC 1962 JD ·1988 CK6 | |
main-belt ·(middle) [3] | |
Orbital characteristics [1] | |
Epoch 16 February 2017 (JD 2457800.5) | |
Uncertainty parameter 0 | |
Observation arc | 85.83 yr (31,351 days) |
Aphelion | 3.1700 AU |
Perihelion | 2.1916 AU |
2.6808 AU | |
Eccentricity | 0.1825 |
4.39 yr (1,603 days) | |
209.87° | |
0° 13m 28.56s / day | |
Inclination | 6.9511° |
170.11° | |
357.21° | |
Physical characteristics | |
Dimensions | 17.00±3.43 km [4] 17.50±4.91 km [5] 17.90±0.57 km [6] 19.05 km (derived) [3] 19.09±0.8 km (IRAS:15) [7] 19.663±0.049 km [8] 20.683±0.181 km [9] |
11.989±0.001 h [10] 19.17 h [11] | |
0.0503±0.0031 [9] 0.070±0.006 [8] 0.08±0.03 [4] 0.08±0.07 [5] 0.0838 (derived) [3] 0.0916±0.008(IRAS:15) [7] 0.105±0.007 [6] | |
S [3] | |
11.81 [1] [4] [6] [7] ·11.87±0.35 [12] ·11.91 [3] [9] [11] ·12.14 [5] | |
1178 Irmela, provisional designation 1931 EC, is a stony asteroid from the middle regions of the asteroid belt, approximately 19 kilometers in diameter.
It was discovered on 13 March 1931, by German astronomer Max Wolf at Heidelberg Observatory in southwest Germany. [13] The asteroid was named after Irmela Ruska, wife of Ernst Ruska. [2]
Irmela orbits the Sun in the central main-belt at a distance of 2.2–3.2 AU once every 4 years and 5 months (1,603 days). Its orbit has an eccentricity of 0.18 and an inclination of 7° with respect to the ecliptic. [1] A first precovery was taken at Lowell Observatory in February 1931, extending the body's observation arc by 3 weeks prior to its official discovery observation at Heidelberg. [13]
In May 1984, a first rotational lightcurve of Irmela was obtained from photometric observations by American astronomer Richard Binzel. Lightcurve analysis gave a rotation period of 19.17 hours with a brightness variation of 0.34 magnitude ( U=2 ). [11]
In March 2010, astronomer Robert Stephens obtained another lightcurve at the Center for Solar System Studies, that gave a divergent period of 11.989 hours with an amplitude of 0.40 magnitude ( U=2 ). [10]
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Irmela measures between 17.00 and 20.683 kilometers in diameter and its surface has an albedo between 0.0503 and 0.105. [4] [5] [6] [7] [8] [9]
10μm radiometric data collected from Kitt Peak National Observatory in 1975, gave a diameter estimate of 19 kilometers. [14]
The Collaborative Asteroid Lightcurve Link characterizes Irmela as a common S-type asteroid, derives an albedo of 0.0838 and calculates a diameter of 19.05 kilometers with an absolute magnitude of 11.91. [3]
This minor planet was named after Irmela Ruska, wife of the inventor of the electron microscope and 1986 Nobelist, the German physicist Ernst Ruska (1906–1988), who shared the Nobel prize with Gerd Binnig and Heinrich Rohrer. The naming was granted by Max Wolf to his colleague August Kopff, himself a prolific discoverer of minor planets. The citation was published by Paul Herget in The Names of the Minor Planets ( H 109 ). [2]
2127 Tanya, provisional designation 1971 KB1, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 40 kilometers in diameter. It was discovered on 29 May 1971, by Russian astronomer Lyudmila Chernykh at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula. It was named in memory of Tanya Savicheva, a Russian child diarist during World War II.
4349 Tibúrcio, provisional designation 1989 LX, is a dark asteroid from the central region of the asteroid belt, approximately 29 kilometers in diameter. It was discovered on 5 June 1989, by German astronomer Werner Landgraf at ESO's La Silla Observatory in northern Chile.
1743 Schmidt, provisional designation 4109 P-L, is a dark background asteroid from the inner regions of the asteroid belt, approximately 19 kilometers in diameter. It was discovered during the Palomar–Leiden survey on 24 September 1960, by astronomers Ingrid and Cornelis van Houten at Leiden, on photographic plates taken by Tom Gehrels at Palomar Observatory in California. The C-type asteroid has a rotation period of 17.5 hours. It was named for the optician Bernhard Schmidt.
Athalia, provisional designation 1903 ME, is a carbonaceous Themistian asteroid from the outer regions of the asteroid belt, approximately 40 kilometers in diameter. It was discovered on 20 September 1903, by German astronomer Max Wolf at the Heidelberg Observatory in southwest Germany. The asteroid was named after the ancient Judahite queen Athaliah.
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.
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.
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.
1154 Astronomia, provisional designation 1927 CB, is a carbonaceous background asteroid from the outer regions of the asteroid belt, approximately 60 kilometers in diameter. It was discovered by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory on 8 February 1927. The asteroid was named for the natural science of astronomy.
1159 Granada, provisional designation 1929 RD, is a dark background asteroid and relatively slow rotator from the inner regions of the asteroid belt, approximately 30 kilometers in diameter. It was discovered on 2 September 1929, by astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany. The asteroid was named for the Spanish city and province of Granada.
6349 Acapulco, provisional designation 1995 CN1, is a dark Adeonian asteroid from the middle region of the asteroid belt, approximately 22 kilometers in diameter.
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.
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.
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.
2126 Gerasimovich, provisional designation 1970 QZ, is a stony background asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 30 August 1970, by Soviet astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula. The asteroid was named after Russian astronomer Boris Gerasimovich.
2324 Janice, provisional designation 1978 VS4, is a dark background asteroid from the outer regions of the asteroid belt, approximately 25 kilometers (16 miles) in diameter. It was discovered on 7 November 1978, by American astronomers Eleanor Helin and Schelte Bus at the Palomar Observatory in California. The asteroid was named for Janice Cline at Caltech. The presumably C-type asteroid has a rotation period of 23.2 hours.
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.
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.
1405 Sibelius, provisional designation 1936 RE, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 12 September 1936, by Finnish astronomer Yrjö Väisälä at Turku Observatory in Southwest Finland. The asteroid was named after composer Jean Sibelius.
2120 Tyumenia is a dark background asteroid, approximately 45 kilometers in diameter, located in the outer regions of the asteroid belt. It was discovered on 9 September 1967, by Soviet astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula. The asteroid was named for the now Russian district of Tyumen Oblast in Western Siberia.