2005 FY9
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| Discovery A | |
|---|---|
| Discoverer | Michael E. Brown, Chad Trujillo, David Rabinowitz |
| Discovery date | March 31 2005 |
| Alternate designations | none B |
| Category | Trans-Neptunian object |
| Orbital elements C | |
| Eccentricity (e) | 0.15 |
| Semi-major axis (a) | 6846 Gm (45.64 AU) |
| Perihelion (q) | 5807 Gm (38.71 AU) |
| Aphelion (Q) | 7885 Gm (52.57 AU) |
| Orbital period (P) | 112000 d (308 a) |
| Mean orbital speed | 4.419 km/s |
| Inclination (i) | 29.00° |
| Longitude of the ascending node (Ω) | 79.42° |
| Argument of perihelion (ω) | 245.85° |
| Mean anomaly (M) | 213.92° |
| Physical characteristics | |
| Dimensions | ? |
| Mass | ?×10? kg |
| Density | ? g/cm³ |
| Surface gravity | ? m/s² |
| Escape velocity | ? km/s |
| Rotation period | ? d |
| Spectral class | ? |
| Absolute magnitude | -0.3 |
| Albedo | ? |
| Mean surface temperature | ~? K |
2005 FY9 (also written 2005 FY9), codenamed "Easterbunny" by its discoverers, is a very large Kuiper belt object discovered on March 31, 2005 by the team led by Michael Brown. Its discovery was announced on July 29, 2005 on the same day as two other very large trans-Neptunian objects, 2003 EL61 and 2003 UB313.
The designation 2005 FY9 is only provisional. Given the importance of the object and the fact that it has been found on older photographs (precovered), it may receive a proper name soon. According to the current naming rules of the International Astronomical Union, it will be named after a creation or underworld deity.
2005 FY9 was detected by the Spitzer space telescope. Initial estimates gave a diameter of 50% to 75% that of Pluto. It is similar in size to 2003 EL61, although slightly brighter. This makes it the largest Kuiper belt object after 2003 UB313 and Pluto.
It is currently visually the second brightest Kuiper belt object after Pluto having the apparent magnitude of nearly 17. Therefore it is visible to high-end amateur telescopes.
According to Brown, the surface of 2005 FY9 is Pluto-like.[1]
The object orbits the Sun every 308 years. Like Pluto's, its orbit is somewhat eccentric and inclined.
Unlike the other above-mentioned trans-Neptunian objects, 2005 FY9 does not have any known moons.
External link
| Large trans-Neptunian objectsedit |
| Kuiper belt: Pluto (Charon) | Orcus | Ixion | 2002 UX25 | Varuna 2002 TX300 | 2003 EL61 | Quaoar | 2005 FY9 | 2002 AW197 |
| Scattered disc: 2003 UB313 | Sedna† |
| See also Triton, astronomical objects and the solar system's list of objects, sorted by radius or mass. For pronunciation, see: Centaur and TNO pronunciation. † Current MPC classification. Some consider Sedna an Oort cloud object. |
| The minor planetsedit |
| Vulcanoids | Main belt | Groups and families | Near-Earth objects | Jupiter Trojans |
| Centaurs | Damocloids | Comets | Trans-Neptunians (Kuiper belt | Scattered disc | Oort cloud) |
| For other objects and regions, see: Binary asteroids, Asteroid moons and the Solar system For a complete listing, see: List of asteroids. For pronunciation, see: Pronunciation of asteroid names. |
