| 词条 | 2004 TN1 |
| 释义 |
|minorplanet = yes |background = #FFC2E0 |name = {{mp|2004 TN|1}} |discovery_ref = [1] |discoverer = NEAT (644) |discovered = October 5, 2004 |mp_category = Apollo asteroid, Near-Earth object, Potentially hazardous object |orbit_ref = [2] |epoch = 13 January 2016 (JD 2457400.5) |semimajor = {{Convert|2.7452|AU|Gm|abbr=on}} |perihelion = {{Convert|0.82890|AU|Gm|abbr=on}} |aphelion = {{Convert|4.6616|AU|Gm|abbr=on|lk=on}} |eccentricity = 0.69806 |inclination = 8.4446° |asc_node = 213.99° |arg_peri = 233.52° |moid = 0.00000871 AU (0.0034 LD) (1303 km) |period = 4.55 yr (1661.4 d) |mean_anomaly = 153.25° |abs_magnitude = 21.8 |dimensions = 115-260 meters[3] |mean_motion = {{Deg2DMS|0.21669|sup=ms}} /day |uncertainty = 6 |jupiter_moid = {{Convert|0.82615|AU|Gm|abbr=on}} }}{{mp|2004 TN|1}} is an Apollo near-Earth asteroid and potentially hazardous object discovered on 5 October 2004 by NEAT at Mount Palomar. It has the fourth smallest geocentric Minimum Orbital Intersection Distance of any asteroid, after 2008 TC3 which exploded in Earth's atmosphere in 2008, 1994 GV, and 2014 AA which also impacted the Earth in 2014. The asteroid, however, will not make any significant close approaches to Earth in at least the next century.[2] However, its orbit is poorly determined, with only 58 observations over 30 days between October 5 and November 4, 2004, yielding an orbital certainty of 6, with 0 being a well-determined orbit and 9 being an extremely poorly determined orbit. More observations would be needed to determine whether the asteroid may impact the earth in the next several hundred years. Absolute magnitude estimates guess the asteroid to be approximately 115–260 meters (380–850 feet) in diameter. A theoretical impact into porous rock at 45 degrees, assuming the asteroid to have a density of 2 g/cm3, would yield a crater between 1.7 and 3.2 kilometers wide, slightly larger than Meteor Crater in Arizona.[4] References1. ^{{cite web|title=2004 TN1 - Minor Planet Center|url=http://www.minorplanetcenter.net/db_search/show_object?object_id=2004%20TN1&commit=Show|website=Minor Planet Center|publisher=IAU|accessdate=1 November 2014}} 2. ^1 {{cite web|title=JPL Small-Body Database Browser - 2004 TN1|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004%20TN1;orb=0;cov=0;log=0;cad=0#cad|website=JPL|publisher=NASA|accessdate=30 March 2016}} 3. ^{{cite web|title=Glossary: Absolute Magtnitude (H)|url=http://neo.jpl.nasa.gov/glossary/h.html|website=JPL|publisher=NASA|accessdate=1 November 2014}} 4. ^{{cite web|last1=Melosh|first1=H. J.|last2=Bey|first2=Ross A.|title=Crater size from projectile diameter|url=http://www.lpl.arizona.edu/tekton/crater_c.html|website=www.lpl.arizona.edu|accessdate=1 November 2014|archive-url=https://web.archive.org/web/20141117083517/http://www.lpl.arizona.edu/tekton/crater_c.html|archive-date=17 November 2014|dead-url=yes|df=dmy-all}} External links
4 : Apollo asteroids|Minor planet object articles (unnumbered)|Potentially hazardous asteroids|Astronomical objects discovered in 2004 |
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