| 词条 | 2010 TD54 |
| 释义 |
| minorplanet = yes | name = {{mp|2010 TD|54}} | background = #FFC2E0 | image = Asteroid 2010TD54 orbit.jpg | image_size = 265 | caption = Orbital diagram of {{mp|2010 TD|54}} during its near-Earth encounter on 12 Oct 2010 | discovery_ref = | discoverer = Mount Lemmon Srvy. | discovery_site = Mount Lemmon Obs. | discovered = 9 October 2010 | mpc_name = {{mp|2010 TD|54}} | alt_names = | pronounced = | named_after = | mp_category = NEO{{·}}Apollo [3] | orbit_ref = | epoch = 4 September 2017 (JD 2458000.5) | uncertainty = 6 | observation_arc = 3 days | aphelion = 3.2396 AU | perihelion = 0.7020 AU | semimajor = 1.9708 AU | eccentricity = 0.6438 | period = 2.77 yr (1,011 days) | mean_anomaly = 159.97° | mean_motion = {{Deg2DMS|0.3562|sup=ms}} / day | inclination = 4.3045° | asc_node = 18.607° | arg_peri = 76.068° | moid = 0.000178 AU 0.0693 LD | dimensions = 5 m[5] 5–10 m[6] | rotation = 0.01167 h {{small|(dated)}}[7] 0.0229317 h[5]{{efn|name=lcdb-Ryan 2011}} | albedo = 0.20 {{small|(assumed)}}[5] | spectral_type = Srv [10] | abs_magnitude = 28.9 }}{{mp|2010 TD|54}} is a tiny asteroid and fast rotator, classified as near-Earth object of the Apollo group, approximately 5 meters in diameter. It was first observed by the Mount Lemmon Survey in October 2010, when the asteroid crossed through the Earth-moon system and had a close encounter with Earth.[6] Orbit and classification{{mp|2010 TD|54}} orbits the Sun at a distance of 0.7–3.2 AU once every 2 years and 9 months (1,011 days). Its orbit has an eccentricity of 0.64 and an inclination of 4° with respect to the ecliptic.The body's observation arc begins with its first observations by the Mount Lemmon Survey and only spans over a period of 3 days until 12 October 2010. It has been observed since then.[3] Close approach{{mp|2010 TD|54}} made its closest approach at 10:51, 12 October 2010 UTC (6:51 EDT a.m.) at {{convert |0.000346 | AU |km mi |abbr=on |lk=on}}. It is one of the closest known approaches of an asteroid to Earth, at which time the object appeared at a magnitude of 14. It was first observed by of the Catalina Sky Survey{{'}}s telescopes north of Tucson, Arizona on 9 October 2010.[6]It has an Earth minimum orbit intersection distance of {{convert |0.000178086 |AU |km mi |abbr=on |lk=off |sigfig=3}}, which corresponds to 0.0693 lunar distance. It was removed from the Sentry Risk Table on 11 October 2010.[17] The asteroid may have passed {{convert |0.0009 |AU |km mi |abbr=on |lk=off |sigfig=3}} from Earth in October 1979, but the nominal orbit suggests it passed millions of kilometres from Earth in 1979. Physical characteristics{{mp|2010 TD|54}} is a stony asteroid, characterized as a Srv subtype.[10]Rotation periodIn November 2010, a rotational lightcurve of {{mp|2010 TD|54}} was obtained from photometric observations, which showed that the asteroid is a fast rotator. Lightcurve analysis gave a well-defined rotation period of 0.0229317 hours (1 minute and 23 seconds) with a brightness amplitude of 0.92 magnitude ({{small|U=3}}). A high amplitude typically indicates that the body has an irregular, elongated rather than spherical shape.{{efn|name=lcdb-Ryan 2011}} This result supersedes a previously obtained lightcurve with a shorter period of 0.01167 hours ({{small|U=1}}).[7] Diameter and albedoThe Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of {{convert |5 |m |ft |abbr=off |lk=off}} based on an absolute magnitude of 28.9.[5] NASA's press release gave an estimated diameter of 5 to 10 meters (16 to 33 feet).[6] See also
Notes{{notelist|refs={{efn|name=lcdb-Ryan 2011|1=Ryan (2011) web: rotation period {{val|0.0229317|0.0000002}} hours with a brightness amplitude of {{val|0.92|0.03}} mag. Summary figures for (2010 TD54) at the LCDB and [https://web.archive.org/web/20160817020952/http://infohost.nmt.edu/~bryan/ Bill Ryan] at Magdalena Ridge Observatory}}}} References1. ^1 2 {{cite web |title = 2010 TD54 |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=2010+TD54 |accessdate = 28 September 2017}} [1][2][3][4][5][6]2. ^1 2 3 4 {{cite news |title = Small Asteroid to Pass Within Earth-Moon System Tuesday |date = 11 October 2010 |publisher = NASA |url = https://www.jpl.nasa.gov/news/news.php?release=2010-332 |accessdate = 28 September 2017}} 3. ^1 {{cite web |title = Sentry: Earth Impact Monitoring – Removed Objects |publisher = NASA/JPL CINEOS – Center for Near Earth Object Studies |url = https://cneos.jpl.nasa.gov/sentry/removed.html |accessdate = 28 September 2017}} 4. ^1 2 3 4 {{cite web |title = LCDB Data for 2012 TC4 |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=0%7C2010+TD54 |accessdate = 28 September 2017}} 5. ^1 2 {{Cite journal |display-authors = 6 |first1 = M. |last1 = Popescu |first2 = M. |last2 = Birlan |first3 = R. |last3 = Binzel |first4 = P. |last4 = Vernazza |first5 = A. |last5 = Barucci |first6 = D. A. |last6 = Nedelcu |first7 = F. |last7 = DeMeo |first8 = M. |last8 = Fulchignoni |date = November 2011 |title = Spectral properties of eight near-Earth asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011A&A...535A..15P |journal = Astronomy and Astrophysics |volume = 535 |page = 15 |bibcode = 2011A&A...535A..15P |doi = 10.1051/0004-6361/201117118 |access-date= 28 September 2017}} 6. ^1 2 {{Cite journal |first1 = M. |last1 = Hicks |first2 = H. |last2 = Rhoades |date = October 2010 |title = The near-Earth asteroid 2010 TD54: The fastest rotating natural body known in the solar system? |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2010ATel.2984....1H |journal = The Astronomer's Telegram |issue = 2984 |bibcode = 2010ATel.2984....1H |access-date= 28 September 2017}} }} External links
7 : Apollo asteroids|Minor planet object articles (unnumbered)|Earth-crosser asteroids|Asteroids removed from the Sentry Risk Table|Fast rotating minor planets|Near-Earth objects in 2010|Astronomical objects discovered in 2010 |
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