| 词条 | 1221 Amor |
| 释义 |
| minorplanet = yes | name = 1221 Amor | background = #FFC2E0 | image = 1221 Amur Orbit.png | image_size = 255 | caption = Orbital diagram of Amor (cyan) with Earth, Mars and Jupiter (outermost) on 12 March 1932 | discovery_ref = [1][2] | discoverer = E. Delporte | discovery_site = Uccle Obs. | discovered = 12 March 1932 | mpc_name = (1221) Amor | alt_names = {{mp|1932 EA|1}} | pronounced = | named_after = {{nowrap|Cupid, Roman analogue of Eros [3]}} {{small|(Classical mythology)}} | mp_category = NEO [4]{{·}}Amor [1]{{·}}Amor (II) | orbit_ref = | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 0 | observation_arc = 86.50 yr (31,595 d) | aphelion = 2.7550 AU | perihelion = 1.0832 AU | semimajor = 1.9191 AU | eccentricity = 0.4355 | period = 2.66 yr (971 d) | mean_anomaly = 102.03° | mean_motion = {{Deg2DMS|0.3707|sup=ms}} / day | inclination = 11.879° | asc_node = 171.34° | arg_peri = 26.656° | moid = 0.1069 AU (41.6 LD) | mean_diameter = {{val|0.857|ul=km}} {{small|(calculated)}}[8] {{val|1.0|u=km}} {{small|(est. T. Gehrels)}} | rotation = | albedo = {{val|0.15}} {{small|(assumed)}} {{val|0.20}} {{small|(assumed)}}[8] | spectral_type = S {{small|(assumed)}}[8] | abs_magnitude = {{val|17.6|0.2}}[13] 17.7[1][8] }}1221 Amor, provisional designation {{mp|1932 EA|1}}, is an asteroid and near-Earth object on an eccentric orbit, approximately {{convert|1|km|mi|abbr=off|sigfig=1|sp=us}} in diameter. It is the namesake of the Amor asteroids, the second-largest subgroup of near-Earth objects. Discovered by Eugène Delporte at the Uccle Observatory in 1932, it was the first time that an asteroid was seen to approach Earth so closely.[1] The assumed S-type asteroid is one of few low-numbered asteroids for which no rotation period has been determined.[8] It was named for Cupid, also known as "Amor" in Latin, the Roman equivalent of the Greek god Eros.[3] DiscoveryOn 12 March 1932, Belgian astronomer Eugène Delporte photographed Amor at the Royal Observatory of Belgium in Uccle,[1] as it approached Earth to within 16 million kilometers (about 40 times the distance from Earth to the Moon). This was the first time that an asteroid was seen to approach Earth so closely. The body's observation arc begins with its official discovery observation on 12 March 1932, when it was observed at the Uccle and Heidelberg observatories simultaneously.[1] A month later, 1862 Apollo was seen to cross Earth's orbit, and the scientific community suddenly realized the potential threat these flying mountains presented.{{citation needed|date=September 2018}} Orbit and classificationAmor is the namesake of the Amor asteroid, a subgroup of near-Earth asteroids that approach the orbit of Earth from beyond, but do not cross it. Next to the Apollo group, the Amors are is the second largest group of near-Earth objects with more than 7,000 known members.[22] As with many members of this group, Amor is also a Mars-crosser, crossing the orbit of the Red Planet at 1.66 AU.It orbits the Sun at a distance of 1.08–2.76 AU once every 2 years and 8 months (971 days; semi-major axis of 1.92 AU). Its orbit has a high eccentricity of 0.44 and an inclination of 12° with respect to the ecliptic. Close encountersAmor has an Earth minimum orbital intersection distance of {{convert |0.1069 |AU |km |abbr=on |lk=off |sigfig=3}} which corresponds to 41.6 lunar distances. In March 1940, it approached Earth to {{convert |0.1052 |AU |km |abbr=on |lk=off |sigfig=3}}, its closest approach of all close encounters since 1900. Only in March 2129, it will approach Earth at a similar distance of {{convert |0.1082 |AU |km |abbr=on |lk=off |sigfig=3}}.NamingThis minor planet was named after the Roman god of love, Cupid, also known as Amor in Latin, and the Roman equivalent of the Greek god Eros.[3] The near-Earth asteroids 433 Eros and 763 Cupido are also named after the god of love. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ({{small|H 113}}).[3] Physical characteristicsAmor is an assumed, stony S-type asteroid.[8]Rotation periodAs of 2018, no rotational lightcurve of Amor has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[8] Diameter and albedoAccording to Tom Gehrels{{'s}} publication Hazards due to Comets and Asteroids from 1994 (pp.540–543), Amor measures 1.0 kilometer in diameter and its surface has an albedo of 0.15. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 0.857 kilometers based on an absolute magnitude of 17.7.[8] References1. ^1 2 3 4 {{cite book |title = Dictionary of Minor Planet Names – (1221) Amor |last = Schmadel | first = Lutz D. |publisher = Springer Berlin Heidelberg |page = 102 |date = 2007 |isbn = 978-3-540-00238-3 |doi = 10.1007/978-3-540-29925-7_1222 |chapter = (1221) Amor }} [1][2][3][4][5][6][7]2. ^1 2 3 4 5 6 {{cite web |title = 1221 Amor (1932 EA1) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1221 |accessdate = 24 September 2018}} 3. ^1 {{cite web |title = Asteroid 1221 Amor |work = Small Bodies Data Ferret |url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1221+Amor |accessdate = 24 September 2018}} 4. ^1 {{cite web |title = Asteroid (1221) Amor |publisher = NEODyS-2, Near-Earth object – Dynamic Site |url = http://newton.dm.unipi.it/neodys2/index.php?pc=1.1.0&n=1221 |accessdate = 24 September 2018}} 5. ^1 {{cite web |title = Discovery Statistics – Cumulative Totals |publisher = NASA/JPL CNEOS |url = https://cneos.jpl.nasa.gov/stats/totals.html |date = 21 September 2018 |accessdate = 24 September 2018}} 6. ^1 2 3 4 5 6 7 8 {{cite web |title = LCDB Data for (1221) Amor |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=1221%7CAmor |accessdate = 24 September 2018}} 7. ^1 {{Cite journal |first1 = W. Z. |last1 = Wisniewski |first2 = T. M. |last2 = Michalowski |first3 = A. W. |last3 = Harris |first4 = R. S. |last4 = McMillan |date = April 1997 |title = Photometric Observations of 125 Asteroids |url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1997Icar..126..395W |journal = Icarus |volume = 126 |issue = 2 |pages = 395–449 |bibcode = 1997Icar..126..395W |doi = 10.1006/icar.1996.5665 |access-date= 24 September 2018}} }} External links
5 : Amor asteroids|Discoveries by Eugène Joseph Delporte|Minor planets named from Roman mythology|Named minor planets|Astronomical objects discovered in 1932 |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。