Huntersg814

최근 수정 시각: 2020-11-15 15:33:04. 2006년 9월 11일, 처음 지구에 가까이 접근했으며 그 때의 거리는 839,344km였다. 이후 2007년 1월 3일, 3월 25일에 각각 533,436km, 353,455km까지 접근하고 2007년 6월 14일, 마지막으로 지구에 276,839km까지 접근해서 스쳐 지나간 뒤.

👉welcome to the galaxy ofunknown terms of science!- today's video is on 💥the terms and photos used are extracted from go. (2006 RH120) Classification: Apollo NEO SPK-ID: 3403148. 2006-09-14 last obs. Used: 2007-06-22 planetary ephem. SB431-N16 condition code: 1 norm. RMS.78805 source: ORB producer Otto Matic solution date.

From Wikipedia

2006 RH₁₂₀ is the provisional designation for a small asteroid, with a diameter estimated at two metres^[1] which ordinarily orbits the Sun but temporarily enters Earth orbit about every 21 years. It most recently was in Earth orbit from September 2006 to June 2007. Until given a minor planet designation on February 18, 2008, the object was known as 6R10DB9, an internal identification number assigned by the Catalina Sky Survey.^[2]

Some controversy existed regarding the origin of the object. Upon discovery, it was not given a formal name since its size and orbit suggested it may have been an artificial object. A precedent for this exists in J002E3, currently thought to be the third stage Saturn S-IVB booster from Apollo 12, in an almost identical orbit.

History

2006 RH₁₂₀ was discovered on 14 September 2006 by the 27-inch (690 mm) Schmidt camera of the Catalina Sky Survey in Arizona.^[3] Preliminary orbital calculations indicated it was captured by Earth's gravity from solar orbit of a period of about 11 months, which is similar to that of many spent rocket boosters dating to the Apollo program of the 1960s and early 1970s. Buick intellilink update download. However, later analysis shows the body is not affected by the pressures of solar radiation and must be a dense rocky body or at least regularly shaped. One hypothesis is that the object is a piece of lunar rock ejected by an impact.^[4]

'6R10DB9' was the Catalina Sky Survey's own discovery designation for this object, which usually would only be used on the MPC's NEO Confirmation Page (NEOCP) until an IAU designation was applied, if the object was classified as a minor object. It was added on September 14 to the NEOCP and subsequently removed with the explanation that it 'was not a minor planet.'^[5] However, the object was later confirmed to be a minor planet.

The object made four Earth orbits before being ejected after the June 2007 perigee. At that perigee, it dipped inside the Moon's orbit to a distance of approximately 200,000 miles (320,000 km). Clo virtual fashion free download.

June 14, 2007 Perigee

On June 14, 2007, 2006 RH₁₂₀ made its fourth and last perigee of its 2007 encounter. It was 0.7 lunar distances at closest, with an apparent magnitude of 18.5 - 19.0.

Astronomers at JPLGoldstone in California, USA made radarastrometry measurements on June 12, 14 and 17, 2007.

The object is now in solar orbit. A next potential near-Earth encounter will be 2028.

References and footnotes

1. ↑'JPL Goldstone Planning Page'. http://echo.jpl.nasa.gov/asteroids/6R10DB9/html/6R10DB9_planning.html. Retrieved 2007-06-07.
2. ↑Great Shefford Observatory. '2006 RH120 ( = 6R10DB9) - A second moon for the Earth?'. http://www.birtwhistle.org/Gallery6R10DB9.htm. Retrieved April 16, 2008.
3. ↑'Distant Artificial Satellites Observation (DASO) Circular No. 68, 2006 Sept. 17, 16:59 UT'. http://cfa-www.harvard.edu/~gwilliams/DASO/000000/DASO_000068.txt. Retrieved 2007-06-26.
4. ↑Bill Gray. 'Pseudo-MPEC for 6R10DB9'. http://home.gwi.net/~pluto/mpecs/6r1.htm. Retrieved August 16, 2007.
5. ↑'Major News About Minor Objects, April 18, 2007'. http://www.hohmanntransfer.com/news/0704.htm#news. Retrieved 2007-06-27.

See also

• 6Q0B44E - Another small Earth satellite, probably artificial
• 3753 Cruithne - Another 'Second Moon' candidate
• 2002 AA₂₉ - Potential Earth-orbiting asteroid

External links

• JPL Horizons ephemeris gererator Change target body to '2006 RH120'.

2008 TC₃- The world's first asteroid discovered before Earth impact -

In 2008 CSS observer Richard Kowalski discovered the first asteroid in history to be detected before it impacted the Earth. The object, 2008 TC₃, was discovered 20 hours before it exploded in the atmosphere above northern Sudan. A team of scientists recovered fragments of the small stony asteroid from the desert floor.

2014 AA- The world's second asteroid discovered before Earth impact -

Another impactor also discovered by CSS observer Richard Kowalski was detected on the last day of 2013. Designated 2014 AA, it impacted into the Atlantic Ocean about 21 hours after discovery. The animation below shows the sequence of the 4 discovery images acquired ~9 minutes apart from the CSS's 60 inch Mt Lemmon telescope.

Figure below shows probable impact location of near-Earth asteroid 2014 AA based on infrasound data from the Comprehensive Nuclear-Test-Ban Treaty Organization. NASA/JPL.

WT1190F - Space junk returns to Earth in fiery passage -

The object WT1190F was discovered in 2015 by CSS observer Rose Matheny. This strange object was determined to be a piece of artificial space debris, possibly a part of the Lunar Prospector mission. Further observations revealed that the Catalina Sky Survey had previously observed this object in 2013. WT1190F burned up in the atmosphere over the Indian Ocean near Sri Lanka later that same year. To understand more about Earth impacting objects, WT1190F was tracked by both ground-based telescopes, and a NASA airborne observatory.

Discovery images of WT1190F from Oct. 3, 2015 10:05 - 10:27 UT, taken by Rose Matheny at CSSs Schmidt telescope on Mt. Bigelow, Arizona. There are 4 still images presented here in an animation and in a 2 x 2 grid. This is actually the fourth time CSS had 'discovered' this object. See Bill Gray's WT1190F FAQ at Project Pluto for more details, particularly concerning its entry into the Earth's atmosphere on Nov. 13, 2015.

2006 RH₁₂₀- This strange asteroid sometimes orbits the Earth -

Discovered by CSS in September 2006, this so-called Temporarily Captured Object (TCO) (PDF) exhibits an unusual near-Earth orbit wherby the asteoid becomes temporarily transfered into geocentric (Earth) orbit. There is believed to be a very small population of TCOs which are likely sourced from more common near-Earth asteroid orbital families known as Amors and Atens. Their orbits are considered unstable as gravitational energy from the Earth will eventually hurl them away from near-Earth space. In the meantime, the occaisional TCO encounters with Earth and their relatively low velocity make them very attractive targets for space resource exploration. Initially the orbit of 2006 RH₁₂₀ appeared similar to that of some Apollo-era spent rockets boosters, although as further observational data were acquired and analyzed, the objects 'area-to-mass-ratio' (AMR) conclusively showed it to be a natural asteroid body. Fortunateley, with ever increasing capabilities of NEO surveys it is likely that more TCOs will be discovered in the coming years, allowing for improved defintion and characterization of this strange and rarefied class of near-Earth objects.

Rendezvous transfer boosts to 2006RH120 from a Halo orbit around L2: Inertial Frame (left). Rotating Frame (Right) -after Brelsford et al 2015 (PDF), Rendezvous Missions to Temporarily-Captured Near Earth Asteroids-

Comets:

Collectively the Catalina Sky Survey has discovered >300 comets to date. Included within these totals are the individual comet discoveries by CSS observers, which by convention now bear their respective names. Currently our observer totals for comet discoveries are:

CSS Active Observers

Alex Gibbs: 31

Eric Christensen: 24

Richard Kowalski: 14

Gregory Leonard: 10

David Rankin: 7

Steve Larson: 5

Carson Fuls: 4

Hannes Gröller: 2

Earth Has A Second Moon

Teddy Pruyne: 2

Kacper Wierzchos: 1

CSS Former Observers

Earth Has 2 Moons

Rob McNaught: 82

Richard 'Rik' Hill: 27

Andreas Boattini: 25

Could Earth Get Another Moon

Gordon Garradd: 17

Brian Africano: 5

Al Grauer: 3

2006 Rh120 Asteroid

Carl Hergenrother: 3

Tim Spahr: 3

Ed Beshore: 3

Earth Second Moon Appears

Rose Matheny: 2

Jess Johnson: 2