| 词条 | Atira asteroid | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 释义 |
The first suspected Apohele was {{mpl|1998 DK|36}}, and the first confirmed was 163693 Atira in 2003. There are 19 suspected Apoheles, of which 17 have well-known orbits, of which six have been determined with sufficient precision to receive a permanent number (see {{section link||List}} below).[4] An additional 68 objects (not listed) have aphelia smaller than Earth's aphelion (Q = 1.017 AU).[5] The Near Earth Object Surveillance Satellite is intended to find more. In great part because of the search methods used to look for asteroids, there are currently no known asteroids with orbits contained within Venus (Q = 0.728 AU) or Mercury's (Q = 0.467 AU, e.g. vulcanoids). As of January 2019, the asteroid with the smallest known aphelion is {{mpl|2019 AQ|3}}, with an aphelion of 0.773 AU.[4] There is no standard name for the class. The name Apohele was proposed by the discoverers of {{mpl|1998 DK|36}},[7] and is the Hawaiian word for orbit; it was chosen partially because of its similarity to the words aphelion (apoapsis) and helios.{{efn|name=Tholen-CCC}} Other authors adopted the designation Inner Earth Objects (IEOs).[8] Still others, following the general practice to name a new class of asteroids for the first recognized member of that class,[9][10] use the designation Atira asteroids.[1] Apoheles do not cross Earth's orbit and are not immediate impact event threats, but their orbits may be perturbed outward by a close approach to either Mercury or Venus and become Earth-crossing asteroids in the future. The orbits of many of these objects are strongly affected by the Kozai-Lidov mechanism, which contributes to enhanced long-term stability.[1] List
(A) All diameter estimates are based on an assumed albedo of 0.14 (except 163693 Atira, for which the size has been directly measured) (B) Binary asteroid Pseudo-AtirasTwo further asteroids technically pass further from the Sun than Earth does at its closest, but due to the eccentricity of Earth's orbit, still remain entirely within it.{{cn|date=January 2019}} The known pseudo-Atira asteroids are listed below:
See also
References{{notelist|refs={{efn|name=Tholen-CCC|1={{URL|1=http://abob.libs.uga.edu/bobk/ccc/cc070998.html |2=Cambridge Conference Correspondence, (2)}}: WHAT'S IN A NAME: APOHELE = APOAPSIS & HELIOS – from Dave Tholen, Cambridge Conference Network (CCNet) DIGEST, 9 July 1998Benny, Duncan Steel has already brought up the subject of a class name for objects with orbits interior to the Earth's. To be sure, we've already given that subject some thought. I also wanted a word that begins with the letter "A", but there was some desire to work Hawaiian culture into it. I consulted with a friend of mine that has a master's degree in the Hawaiian language, and she recommended "Apohele", the Hawaiian word for "orbit". I found that an interesting suggestion, because of the similarity to fragments of "apoapsis" and "helios", and these objects would have their apoapsis closer to the Sun than the Earth's orbit. By the way, the pronunciation would be like "ah-poe-hey-lay". Rob Whiteley has suggested "Ali`i", which refers to the Hawaiian elite, which provides a rich bank of names for discoveries in this class, such as Kuhio, Kalakaua, Kamehameha, Liliuokalani, and so on. Unfortunately, I think the okina (the reverse apostrophe) would be badly treated by most people. already done so, here's what we've got on the table so far. I'd appreciate some feedback on the suggestions. }} 1. ^{{cite journal |last1=de la Fuente Marcos |first1=Carlos |last2=de la Fuente Marcos |first2=Raúl |date=11 June 2018 |title=Kozai--Lidov Resonant Behavior Among Atira-class Asteroids |journal=Research Notes of the AAS |volume=2 |issue=2 |pages=46 |arxiv=1806.00442 |bibcode=2018RNAAS...2b..46D |doi=10.3847/2515-5172/aac9ce}} [2][3][4][5][6][7][8]2. ^1 {{cite web |title = Asteroids with aphelia between 0.983 and 1.017 AU |url = https://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=all;obj_kind=all;obj_numbered=all;ast_orbit_class=ATE;ast_orbit_class=APO;OBJ_field=0;ORB_field=0;c1_group=ORB;c1_item=Bn;c1_op=range;c1_range_min=0.983;c1_range_max=1.017;table_format=HTML;max_rows=10;format_option=comp;c_fields=AcBhBgBjBkBlBiBnBsCkCqCnCoCpAi;c_sort=;.cgifields=format_option;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=ast_orbit_class;.cgifields=table_format;.cgifields=com_orbit_class&query=1 |accessdate = 7 January 2019}} 3. ^1 {{Cite journal |first1 = D. J. |last1 = Tholen |first2 = R. J. |last2 = Whiteley |date = September 1998 |title = Results From NEO Searches At Small Solar Elongation |journal = American Astronomical Society |volume = 30 |page = 1041 |bibcode = 1998DPS....30.1604T }} 4. ^1 {{Cite journal |first1 = Patrick |last1 = Michel |first2 = Vincenzo |last2 = Zappalà |first3 = Alberto |last3 = Cellino |first4 = Paolo |last4 = Tanga |date = February 2000 |title = NOTE: Estimated Abundance of Atens and Asteroids Evolving on Orbits between Earth and Sun |journal = Icarus |volume = 143 |issue = 2 |pages = 421–424 |bibcode = 2000Icar..143..421M |doi = 10.1006/icar.1999.6282 }} 5. ^1 {{cite web |author = Wm. Robert Johnston |title = Names of Solar System objects and features |website = www.johnstonsarchive.net |date = 24 August 2006 |url = http://www.johnstonsarchive.net/astro/names.html |accessdate = 11 November 2016}} 6. ^1 {{Cite journal |author = Shoemaker, E. M. |date = December 1982 |title = Asteroid and comet bombardment of the earth |journal = Annual Review of Earth and Planetary Sciences |volume = 11 |pages = 461–494 |bibcode = 1983AREPS..11..461S |doi = 10.1146/annurev.ea.11.050183.002333 }} 7. ^1 2 {{cite web |title = Near-Earth Object Groups |publisher = JPL – NASA |url = http://neo.jpl.nasa.gov/neo/groups.html |access-date= 11 November 2016}} 8. ^1 2 3 {{cite web |title = JPL Small-Body Database Search Engine: Q < 0.983 (AU) |publisher = JPL Solar System Dynamics |url = http://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=all;obj_kind=all;obj_numbered=all;OBJ_field=0;ORB_field=0;c1_group=ORB;c1_item=Bn;c1_op=%3C;c1_value=0.983;table_format=HTML;max_rows=100;format_option=comp;c_fields=AcBiBhBnBgBjBrCkAiAp;.cgifields=format_option;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=ast_orbit_class;.cgifields=table_format;.cgifields=com_orbit_class&query=1&c_sort=CkA |accessdate =30 December 2017}} }} External links
1 : Apohele asteroids |
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