(162173) Ryugu is a typical near-Earth asteroid from the Apollo group . Belongs to the dark spectral class C and has an elongated orbit, because of which, in the process of its movement around the Sun, it crosses not only the Earth orbit, but also Mars .
| (162173) Ryugu | |
|---|---|
| Asteroid | |
 2018 Asteroid photo from Hayabusa-2 AWS | |
| Opening | |
| Discoverer | Linear |
| Place of discovery | Socorro |
| Discovery date | May 10, 1999 |
| Alternative notation | 1999 JU 3 |
| Category | NEA ( Apollo ) |
| Orbital characteristics [1] | |
| Age of September 30, 2012 JD 2456200.5 | |
| Eccentricity ( e ) | 0,1902592 |
| Semimajor axis ( a ) | 177.952 million km (1.1895338 AU ) |
| Perihelion ( q ) | 144.095 million km (0.9632141 AU) |
| Aphelion ( Q ) | 211.809 million km (1.4158535 AU) |
| Circulation Period ( P ) | 473.875 days (1.297 g. ) |
| Average orbital speed | 27.06 km / s |
| Inclination ( i ) | 5.88404 ° |
| Longitude node (Ω) | 251.61712 ° |
| Perihelion Argument (ω) | 211.42300 ° |
| Median Anomaly ( M ) | 226.57102 ° |
| Physical Characteristics [2] | |
| Diameter | 0.92 km |
| Weight | 4,5⋅10 11 kg |
| Rotation period | 7.63 h |
| Spectral class | C (Cg) |
| Apparent magnitude | 21.69 m (current) |
| Absolute magnitude | 19,173 m |
| Current distance from the sun | 0.995 a. e. |
| Current distance from earth | 1,563 a. e. |
Content
Discovery and research
The asteroid was discovered on May 10, 1999 as part of the LINEAR project at Socorro Observatory ( USA ) and received the provisional designation 1999 JU 3 . In October 2015, the asteroid received its official name - Ryugu ( Japanese リ ュ ウ グ ウ Ryūgū ) .
The name is taken from the Japanese tale of the fisherman Urasima Taro , who visited the magical underwater castle-palace Ryugu-jo - the residence of the ruler of the sea elements of the dragon Ryujin . From there, the fisherman brought home a mysterious paper box, presented to him by the daughter of a sea ruler. When choosing a name for the asteroid, it was considered that the plot of the fairy tale echoes the task of the Hayabusa-2 probe to deliver a sample of soil from the asteroid to Earth whose composition is unknown [3] .
The asteroid was chosen as the target for visiting the Japanese interplanetary station “ Hayabusa-2 ” in order to land and take a soil sample [4] . The diameter of the asteroid is estimated at 0.92 km , which is almost twice as large as that of the asteroid (25143) Itokawa , which in 2005 was visited by the predecessor of this mission, the Hayabusa probe [5] . The launch of the Hayabusa-2 probe took place on December 3, 2014 from Tanegashima Cosmodrome [6] . On July 7, 2018, the probe reached the asteroid.
On September 21, 2018, the first successful soft landing of robot modules on the surface of an asteroid was made in history [7] . The first shots were taken from the bouncing landing robot modules Rover-1A and Rover-1B [8] . Both modules were in the MINERVA II-1 container [9] [10] . The MASCOT landing module (developed by the German Aerospace Center) from the MINERVA II-2 container worked on the asteroid for more than 17 hours [11] . During this time, the module changed its location three times, successfully completed the planned studies of the composition of the soil and the properties of the asteroid, and transmitted the data to the orbiter [12] .
- Orbit of the Ryugu asteroid and its position in the solar system
Convergence
| date | but. e. | distances to the moon | heavenly body |
|---|---|---|---|
| 11/24/1985 21:16 | 0,049793 | 19,4 | Land |
| 12/21/2033 5:53 | 0,047444 | 18.5 | Land |
| 12/05/2076 6:14 | 0,008624 | 3.36 | Moon |
| 12/06/2076 5:43 | 0,010441 | 4.07 | Land |
| 12/22/2163 16:11 | 0.046844 | 18.2 | Land |
See also
- List of asteroids ( 162101-162200 )
- Classifications of Minor Planets
- List of asteroids crossing the Earth’s orbit
- List of asteroids crossing the orbit of Mars
Notes
- ↑ AstDys-2 on (162173) 1999 JU 3
- ↑ NeoDys-2 on (162173) 1999 JU 3
- ↑ JAXA - Name Selection of Asteroid 1999 JU 3 Target of the Asteroid Explorer “Hayabusa2” . JAXA - Japan Aerospace Exploration Agency. Date of treatment March 2, 2016.
- ↑ Hayabusa-2: preparations for the launch of a new asteroid expedition
- ↑ Hayabusa: soil delivered (inaccessible link) . Date of treatment October 14, 2012. Archived October 12, 2011.
- ↑ Japan launched the Hayabusa-2 probe , Lenta.ru (December 3, 2014) to the asteroid . Date of treatment July 17, 2015.
- ↑ Behind primary matter. Rovers sat on an asteroid
- ↑ Hayabusa-2 descent vehicles successfully boarded the Ryugu asteroid
- ↑ MINERVA II-1 Probes on the Ryugu Surface
- ↑ There is a branch! The Japanese on the asteroid. LIVE , Newspaper.Ru . Date of appeal September 21, 2018.
- ↑ The MASCOT landing module carried out its short mission in accordance with the plan
- ↑ MASCOT probe completed work on the asteroid Ryugu and transferred scientific data to orbit
Literature
- Vilas, Faith. Spectral Characteristics of Hayabusa 2 Near-Earth Asteroid Targets 162173 1999 Ju3 and 2001 Qc34 (Eng.) // The Astronomical Journal : journal. - IOP Publishing 2008. - Vol. 135 . - P. 1101 . - DOI : 10.1088 / 0004-6256 / 135/4/1101 . - .
- Hasegawa, Sunao; Müller, Thomas G .; Kawakami, Kyoko; Kasuga, Toshihiro; Wada, Takehiko; Ita, Yoshifusa; Takato, Naruhisa; Terada, Hiroshi; Fujiyoshi, Takuya; Abe, Masanao. Albedo, Size, and Surface Characteristics of Hayabusa-2 Sample-Return Target 162173 1999 JU3 from AKARI (Eng.) // Publications of the Astronomical Society of Japan : journal. - Astronomical Society of Japan. - Vol. 60 , no. SP2 . - P. S399 — S405 .
- Abe, Masanao; Kawakami, Kyoko; Hasegawa, Sunao; Kuroda, Daisuke; Yoshikawa, Makoto; Kasuga, Toshihiro; Kitazato, Kohei; Sarugaku, Yuki; Kinoshita, Daisuke; Miyasaka, Seidai; Urakawa, Seitaro; Okumura, Shinichirou; Takagi, Yasuhiko; Takato, Naruhisa; Fujiyoshi, Takuya; Terada, Hiroshi; Wada, Takehiko; Ita, Yoshifusa; Vilas, Faith; Weissman, Paul; Choi, Young-Jun; Larson, Steve; Bus, Schelte; Mueller, Thomas (July 13–20, 2008). " Ground-based observational campaign for asteroid 162173 1999 JU3 " in 37th COSPAR Scientific Assembly ..
- Campins, H .; Emery, JP; Kelley, M .; Fernández, Y .; Licandro, J .; Delbó, M .; Barucci, A .; Dotto, E. Spitzer observations of spacecraft target 162173 (1999 JU3 ) // Astronomy and Astrophysics : journal. - EDP Sciences 2009. - Vol. 503 . - P. L17 . - DOI : 10.1051 / 0004-6361 / 200912374 . - . - arXiv : 0908.0796 .
- (March 10-14, 2008) " GROUND-BASED OBSERVATIONAL CAMPAIGN FOR ASTEROID 162173 1999 JU3 " in Lunar and Planetary Science XXXIX ..
- Vilas, Faith. SPECTRAL CHARACTERISTICS OF HAYABUSA 2 NEAR-EARTH ASTEROID TARGETS 162173 1999 JU3 AND 2001 QC34 (Eng.) // The Astronomical Journal : journal. - IOP Publishing 2008. - Vol. 135 . - P. 1101 . - DOI : 10.1088 / 0004-6256 / 135/4/1101 . - .
- International Symposium Marco Polo and other Small Body Sample Return Missions . Archived December 14, 2012.