(588) Achilles ( Greek: Ἀχιλλεύς ) is a large Trojan asteroid of Jupiter moving at the Lagrange point L 4 , 60 ° ahead of the planet. The asteroid was discovered on February 22, 1906 by the German astronomer Max Wolf at the Heidelberg Observatory , Germany and named after Achilles , the hero of the Iliad Homer [2] . He was the first discovered Trojan asteroid and is sixth in size among them.
- Orbit of the asteroid Achilles and its position in the solar system
| (588) Achilles | |
|---|---|
| Asteroid | |
| Opening | |
| Discoverer | Max Wolf |
| Place of discovery | Heidelberg |
| Discovery date | February 22, 1906 |
| Eponym | Achilles |
| Alternative notation | 1906 TG |
| Category | Jupiter's Trojans ( L 4 ) |
| Orbital characteristics | |
| Age of August 27, 2011 JD 2455800.5 | |
| Eccentricity ( e ) | 0.1482432 |
| Semimajor axis ( a ) | 777.4 million km (5.1965989 AU ) |
| Perihelion ( q ) | 662.156 million km (4,4262384 AU) |
| Aphelion ( Q ) | 892.644 million km (5.9669594 AU) |
| Circulation Period ( P ) | 4,326.904 days (11.846 g. ) |
| Average orbital speed | 12,994 km / s |
| Inclination ( i ) | 10.31961 ° |
| Longitude node (Ω) | 316.59640 ° |
| Perihelion Argument (ω) | 132.84077 ° |
| Median Anomaly ( M ) | 22.82855 ° |
| Physical Characteristics [1] | |
| Diameter | 135.47 km |
| Weight | 2.6⋅10 18 kg |
| Density | 2,000 g / cm³ |
| Acceleration of gravity on the surface | 0.0379 m / s² |
| 2nd space speed | 0.0716 km / s |
| Rotation period | 7,306 h |
| Spectral class | D |
| Apparent magnitude | 15.83 m (current) |
| Absolute magnitude | 8.67 m |
| Albedo | 0,0328 |
| Average surface temperature | 124 K (−149 ° C ) |
| Current distance from the sun | 5.37 a. e. |
| Current distance from earth | 4.388 a. e. |
Photometric observations conducted in 1994 made it possible to obtain the light curves of this body, from which it followed that the period of rotation of the asteroid around its axis is 7.32 ± 0.02 hours, with a change in brightness with rotation of 0.31 ± 0.01 m [1] .
See also
- List of asteroids ( 501-600 )
- Classifications of Minor Planets
- List of Trojan asteroids ("Greeks")
- List of Trojan asteroids (“Trojans”)
Notes
- ↑ 1 2 Stefano Mottola1, Mario Di Martino, Anders Erikson, Maria Gonano-Beurer, Albino Carbognani, Uri Carsenty, Gerhard Hahn, Hans-Josef Schober, Felix Lahulla, Marco Delbò, and Claes-Ingvar Lagerkvist. ROTATIONAL PROPERTIES OF JUPITER TROJANS. I. LIGHT CURVES OF 80 OBJECTS . The American Astronomical Society . The Astronomical Journal (May 2011). Date of treatment December 30, 2014.
- ↑ Schmadel, Lutz D. Dictionary of Minor Planet Names . - Fifth Revised and Enlarged Edition. - B. , Heidelberg, N. Y .: Springer, 2003 .-- P. 113. - ISBN 3-540-00238-3 .