| 词条 | 4581 Asclepius |
| 释义 |
| minorplanet = yes | name = 4581 Asclepius | background = #FFC2E0 | image = | caption = | discovery_ref = | discovered = 31 March 1989 | discoverer = H. E. Holt N. G. Thomas | discovery_site = Palomar Obs. | mpc_name = (4581) Asclepius | alt_names = 1989 FC | pronounced = {{Respell|ə|SKLEE|pee-əs}} {{IPAc-en|ə|ˈ|s|k|l|iː|p|i|ə|s}} | named_after = Asclepius {{small|(Greek mythology)}}[2] | mp_category = {{nowrap|Apollo{{·}}NEO{{·}}PHA [4]}} | orbit_ref = | epoch = 28 May 2014 (JD 2456805.5) | uncertainty = 0 | observation_arc = 27.27 yr (9,959 days) | aphelion = 1.3874 AU | perihelion = 0.6574 AU | semimajor = 1.0224 AU | eccentricity = 0.3570 | period = 1.03 yr (378 days) | mean_anomaly = 194.55° | mean_motion = {{Deg2DMS|0.9534|sup=ms}} / day | inclination = 4.9190° | asc_node = 180.30° | arg_peri = 255.30° | moid = 0.0036 AU | dimensions = 300 m{{citation needed|date=March 2017}} | rotation = | albedo = | spectral_type = | abs_magnitude = 20.7 }}4581 Asclepius ({{Respell|ə|SKLEE|pee-əs}}), provisional designation {{mp|1989 FC}}, is a sub-kilometer-sized asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group that makes close orbital passes with Earth. Discovered on 31 March 1989 by American astronomers Henry Holt and Norman Thomas at Palomar Observatory, Asclepius is named after the Greek demigod of medicine and healing.[4][2] Asclepius passed by Earth on 22 March 1989, at a distance of {{convert|0.00457|AU|km mi|abbr=on|lk=on}}.[9][10] Although this exceeds the Moon's orbital radius, the close pass received attention at that time. "On the cosmic scale of things, that was a close call," said Dr. Henry Holt.[11] Geophysicists estimate that collision with Asclepius would release energy comparable to the explosion of a 600 megaton atomic bomb.[12] The asteroid was discovered 31 March 1989, nine days after its closest approach to the Earth.[13] Subsequent discoveries revealed that a whole class of such objects exists. Close approaches by objects the size of Asclepius pass by every two or three years, undetected until the start of computerized near-Earth object searches. On 24 March 2051, the asteroid will pass {{convert|0.0123|AU|km mi|abbr=on|lk=on}} from the Earth.[9][10] It will be the eighth pass of less than 30 Gm in this century.[9] JPL shows that the uncertainty region of the asteroid will cause it to mostly likely pass from 0.02 AU to 0.17 AU from the Earth in 2135.[9] References1. ^1 2 {{cite book |title = Dictionary of Minor Planet Names – (4581) Asclepius |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 394 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_4512 |chapter = (4581) Asclepius }} [1][2][3][4][5][6][7]2. ^1 2 {{cite web |title = 4581 Asclepius (1989 FC) |work = Minor Planet Center |url = http://www.minorplanetcenter.net/db_search/show_object?object_id=4581 |accessdate = 13 March 2017}} 3. ^1 2 3 4 {{cite web |type=2015-08-10 last obs (arc=26.36 years) |title=JPL Close-Approach Data: 4581 Asclepius (1989 FC) |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=4581;cad=1#cad |accessdate=2016-01-09}} 4. ^1 2 {{cite web |title=NEODyS-2 Close Approaches for (4581) Asclepius |publisher=Near Earth Objects - Dynamic Site |url=http://newton.dm.unipi.it/neodys/index.php?pc=1.1.8&n=4581 |accessdate=2011-11-08}} 5. ^1 {{cite news|url=http://articles.latimes.com/1989-04-20/news/mn-2278_1_asteroid-nasa-project-national-aeronautics|date=April 20, 1989|work=Los Angeles Times|title=Asteroid's Passing a 'Close Call' for Earth, NASA Says|accessdate=2010-05-07}} 6. ^1 {{cite journal|last=Gilchrist|first=Tom|title=Effects of an impact event: an analysis of asteroid 1989FC|url=https://www.brookes.ac.uk/geoverse/original-papers/effects-of-an-impact-event--an-analysis-of-asteroid-1989fc|journal=Geoverse: eJournal of Undergraduate Research in Geography|date=October 2008|issn=1758-3411|accessdate=2018-03-01}} 7. ^1 {{cite web |date=1998-03-29 |title=How the Asteroid Story Hit: An Aastronomer Reveals How a Discovery Spun Out of Control |publisher=Minor Planet Center and Boston Globe newspaper |author=Brian G. Marsden |author-link=Brian G. Marsden |url=http://www.minorplanetcenter.net/iau/pressinfo/1997XF11Globe.html |accessdate=2011-11-14}} }} External links
7 : Apollo asteroids|Discoveries by Henry E. Holt|Discoveries by Norman G. Thomas|Minor planets named from Greek mythology|Named minor planets|Potentially hazardous asteroids|Astronomical objects discovered in 1989 |
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