(29314) Eurydamas
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Asteroid (29314) Eurydamas |
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|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type | Jupiter Trojan (L 5 ) |
| Major semi-axis | 5.2837 AU |
| eccentricity | 0.0722 |
| Perihelion - aphelion | 4.9019 AU - 5.6656 AU |
| Inclination of the orbit plane | 15.234 ° |
| Length of the ascending node | 143.372 ° |
| Argument of the periapsis | 134.178 ° |
| Time of passage of the perihelion | August 6, 2021 |
| Sidereal period | 12 a 56.2 d |
| Physical Properties | |
| Medium diameter | 21.4 ± 0.8 km |
| Dimensions | 1.44 x 10 16 kg |
| Albedo | 0.140 ± 0.039 |
| Medium density | 0.59 ± 0.06 g / cm³ |
| Rotation period | 15 h 2.1 min |
| Absolute brightness | 11.6 mag |
| history | |
| Explorer | Eric W. Elst |
| Date of discovery | February 8, 1994 |
| Another name | 1994 CR 18 , 2000 TR 49 |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. | |
(29314) Eurydamas is an asteroid belonging to the group of Trojans . It is used to describe asteroids that move on the orbit of Jupiter around the sun. Since Eurydamas has a large companion called S / 2005 (29314) 1 , this system can also be understood as a double asteroid system.
Discovery and naming
(29314) Eurydamas was discovered on February 8, 1994 by the Belgian astronomer Eric Walter Elst at the La Silla Observatory in Chile . After its discovery, Eurydamas was also found on older recordings from December 21, 1989. This allowed his orbit to be calculated more precisely and on October 2, 2001 he received the minor planet number 29314 from the IAU .
The heavenly body was named after the Trojan priest and dream interpreter Eurydamas from Greek mythology .
In total, the asteroid was observed through several earth-based telescopes, so far a total of 686 times within 27 years.
Track properties
Orbit
Eurydamas is located near Jupiter's Lagrange point L 5 . It orbits the sun in a prograde , elliptical orbit between 733,312,000 km (4.90 AU ) and 847,556,000 km (5.67 AU) from its center. The orbital eccentricity is 0.072, the web is about 15.2 ° relative to the ecliptic inclined .
The orbital period of Eurydamas is 12.15 years.
During the opposition , Patroclus achieved a brightness of 11.6 mag . It is therefore an extremely faint object in the night sky.
rotation
Eurydamas rotates once around its axis in 15 hours and 2.1 minutes. From this it follows that the asteroid performs 7,081.4 self- rotations in a Eurydamas year . The rotation period corresponds to the orbital period of the companion S / 2005 (29314) 1 , so it is most likely a double- bound rotation . This means that both bodies always face the same side. The prerequisite for this is a similar mass ratio and a narrow orbit of the two bodies.
Physical Properties
size
The previous observations indicate an irregularly shaped one; the most precise determination of the diameter ( geometric mean ) is 21.386 km.
Based on an average diameter of 21.4 km, the surface area is around 1,437 km 2 , which is roughly between the areas of the Swiss cantons of Aargau and Lucerne .
Provisions of the diameter for Eurydamas
| year | Dimensions km | source |
|---|---|---|
| 2007 | 32 | Man u. a. |
| 2012 | 21.386 ± 0.813 | Grav u. a. |
The most precise determination is marked in bold .
internal structure
The unusually low mean density of 0.59 g / cm 3 is an indication that it is not a compact body, but that the object is likely to be a rubble pile , an accumulation of dust and rocks interspersed with cavities .
moon
On April 14, 2005 a moon of Eurydamas was discovered through light curve observations, which was given the provisional designation S / 2005 (29314) 1 . The moon has a diameter of 16 kilometers and orbits Eurydamas in 0.63 days within Eurydamas Hill radius (9,800 km) at a distance of about 41 km. Eurydamas' rotation is synchronized with the orbital time of the companion.
The Eurydamas system at a glance:
| Components | Physical parameters | Path parameters | discovery | |||||
|---|---|---|---|---|---|---|---|---|
| Surname | Throughput diameter (km) |
Relative size % |
Mass (kg) |
Major semi-axis (km) |
Orbital time (d) |
eccentricity |
Inclination to Eurydama's equator |
Date of discovery Date of publication |
|
(29314) Eurydamas |
21.4 | 100.00 | ? | - | - | - | - | February 8, 1994 February 1994 |
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S / 2005 (29314) 1 (Eurydamas I) |
16.0 | 74.8 | ? | 41 | 0.62646 | ? | ? | April 14, 2005 June 1, 2007
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See also
Web links
- Wm. Robert Johnston: (29314) Eurydamas (English)
Individual evidence
- ↑ (29314) Eurydamas in the Small-Body Database of the Jet Propulsion Laboratory (English). (As of Sept. 2017)
- ^ Rita K. Mann et al: Fraction of contact binary asteroids (September 2007) (PDF). Retrieved September 18, 2017 .
- ↑ T. Grav et al .: WISE / NEOWISE Observations of the Jovian Trojan Population: Taxonomy (November 2012). Retrieved September 18, 2017 .