2007 VK184
The 2014 close approach of 2007 VK184[1]
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|
| Discovery[2] | |
|---|---|
| Discovered by | Catalina Sky Survey (703) |
| Discovery date | November 12, 2007 |
| Designations | |
| Apollo NEO[3] | |
| Orbital characteristics[3] | |
| Epoch 2014-May-23 (JD 2456800.5) (Uncertainty=1)[3] |
|
| Aphelion | 2.7104 AU |
| Perihelion | 0.74227 AU |
| 1.7263 AU | |
| Eccentricity | 0.57003 |
| 828.49 d (2.27 yr) | |
|
Average orbital speed
|
15.6 km/s |
| 338.50° | |
| Inclination | 1.2225° |
| 253.96° | |
| 73.159° | |
| Physical characteristics | |
| Dimensions | ~130 meters (430 ft)[4] |
| Mass | 3.3×109 kg (assumed)[4] |
| ~0.065 meters (2.6 in) per second | |
| 22.0[3] | |
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2007 VK184 (also written 2007 VK184) is an Apollo near-Earth asteroid estimated to be about 130 meters (430 ft) in diameter.[4] It was listed on the Sentry Risk Table with a Torino Scale rating of 1.[4] A Torino scale rating of 1 is a routine discovery in which a pass near the Earth is predicted that poses no unusual level of danger.[5] 2007 VK184 was discovered on November 12, 2007, by the Catalina Sky Survey.[2] It was recovered on March 26, 2014 by Mauna Kea,[6][7] and removed from the Sentry Risk Table on March 28, 2014.[8]
By January 4, 2008, with an observation arc of 52 days, there was a 1 in 2700 chance of an impact with Earth on June 3, 2048.[9]
The Sentry Risk Table, using an observation arc of 60 days, showed the asteroid had a 1 in 1820 chance (0.055%) of impacting Earth on June 3, 2048.[4] Since the March 2014 recovery, it is known that the asteroid will pass 0.013 AU (1,900,000 km; 1,200,000 mi) from Earth on June 2, 2048.[1]
2014 passage
Before the 2014 close approach, the asteroid had a modest observation arc of 60 days,[4] and the imprecise trajectory of this asteroid was complicated by close approaches to Earth, Venus and Mars.[1] On May 23, 2014, the asteroid passed 0.17 AU (25,000,000 km; 16,000,000 mi) from Earth[1] and reached an apparent magnitude of ~20.8.[10] As expected the close approach allowed astronomers to recover the asteroid on March 26, 2014 and refine the odds of a future collision.[7] As the asteroid gets closer to Earth, the positional uncertainty becomes larger.[11] By recovering the asteroid well before closest approach you can avoid searching a larger region of the sky.[11] Most asteroids rated 1 on the Torino Scale are later downgraded to 0 after more observations come in.
Risk assessments were calculated based on a diameter of 130 meters.[4] It was estimated that, if it were ever to impact Earth, it would enter the atmosphere at a speed of 19.2 km/s and would have a kinetic energy equivalent to 150 megatons of TNT.[4] Assuming the target surface is sedimentary rock, the asteroid would impact the ground with the equivalent of 40 megatons of TNT and create a 2.1 kilometers (1.3 mi) impact crater.[12] Asteroids of approximately 130 meters in diameter are expected to impact Earth once every 11000 years or so.[12]
On March 26–27, 2014, additional observations were made which ruled out the chance of an impact in 2048.[11]
See also
- 99942 Apophis, a NEO that, for a few days, was thought to have a slight probability of striking the Earth in 2029. But the likelihood that would happen was quickly determined to be zero.
References
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<references />, or <references group="..." />External links
- Orbital simulation from JPL (Java) / Ephemeris
- List Of The Potentially Hazardous Asteroids (PHAs) (Minor Planet Center)
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2014 in space
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| Space probes |
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| Impact events | ||
| Supernovae | ||
| Notable comets |
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| NEOs | ||
| Exoplanets | ||
| Discoveries |
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| Deep space rendezvous |
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- ↑ 12.0 12.1 Lua error in package.lua at line 80: module 'strict' not found. (solution using 130 meters, 2600 kg/m3, 19.2 km/s, 45 degrees, Target: Sedimentary Rock)
