| 词条 | (85182) 1991 AQ |
| 释义 |
| minorplanet = yes | name = (85182) 1991 AQ | background = #FFC2E0 | image = | image_size = | caption = | discovery_ref = [1] | discoverer = E. F. Helin | discovery_site = Palomar Obs. | discovered = 14 January 1991 | mpc_name = (85182) 1991 AQ | alt_names = 1991 AQ{{·}}1994 RD | pronounced = | named_after = | mp_category = {{nowrap|Apollo{{·}}NEO{{·}}PHA [1]}} | orbit_ref = | epoch = 23 March 2018 (JD 2458200.5) | uncertainty = 0 | observation_arc = 26.91 yr (9,829 d) | aphelion = 3.9474 AU | perihelion = 0.4960 AU | semimajor = 2.2217 AU | eccentricity = 0.7768 | period = 3.31 yr (1,210 d) | mean_anomaly = 64.916° | mean_motion = {{Deg2DMS|0.2976|sup=ms}} / day | inclination = 3.1276° | asc_node = 339.68° | arg_peri = 242.96° | moid = 0.0165 AU (6.428 LD) | mean_diameter = {{val|1.1|ul=km}}[6] {{val|1.14|u=km}} {{small|(derived)}}[7] | rotation = | albedo = {{val|0.18}} {{small|(assumed)}}[7] {{val|0.242|0.194}}[6] | spectral_type = Q {{small|(Tholen)}}[7] | abs_magnitude = 17.1 17.20[7] }} (85182) 1991 AQ, provisional designation {{mp|1991 AQ}}, is a stony asteroid on a highly eccentric orbit, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, approximately {{convert|1.1|km|mi|abbr=off|sigfig=1|sp=us}} in diameter. It was discovered on 14 January 1991, by American astronomer Eleanor Helin at the Palomar Observatory in California.[1] Based on its brightness variation of 0.69 magnitude, this Q-type asteroid is likely elongated.[7] It belongs to the small group of potentially hazardous asteroids larger than one kilometer. Orbit and classification{{mp|1991 AQ}} is a member of the Earth-crossing class of Apollo asteroids, the largest group of near-Earth objects with approximately 10 thousand known members.[1] It is also a Venus- and Mars-crosser due to its extreme perihelion and aphelion, respectively.It orbits the Sun at a distance of 0.5–3.9 AU once every 3 years and 4 months (1,210 days; semi-major axis of 2.22 AU). Its orbit has a high eccentricity of 0.78 and an inclination of 3° with respect to the ecliptic. The body's observation arc begins with its official discovery observation at Palomar in 1991.[1] Close approachesThe asteroid has currently an Earth minimum orbital intersection distance of {{convert |0.0165 |AU |km mi |abbr=on |lk=off |sigfig=3}}, which corresponds to 6.4 lunar distances and makes it a potentially hazardous asteroid due to its notably large size. In 1991 and 1994, it approached Earth at a nominal distance of {{convert|0.054|AU|LD|abbr=on}}. The asteroids closest encounter with Earth is projected to occur on 27 January 2130, at a distance of {{convert|0.0106|AU|LD|abbr=on}} only (see table).[21] It also makes close encounters to Mercury, Venus, Mars and Jupiter.[21] {{Large near earth asteroid flybys 5LD}}Physical characteristicsIn the Tholen classification, this object is an uncommon Q-type asteroid, that falls into the larger stony S-complex.[7] As of 2018, no rotational lightcurve of this asteroid has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown. It has a brightness variation of 0.69 magnitude, indicative for an elongated, non-spherical shape.[7] Diameter and albedoAccording to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, this asteroid measures 1.1 kilometers in diameter and its surface has an albedo of 0.242.[6] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.18 and derives a diameter of 1.14 kilometers based on an absolute magnitude of 17.20.[7] Numbering and namingThis minor planet was numbered by the Minor Planet Center on 30 August 2004 ({{small|M.P.C. 52517}}).[28] As of 2018, it has not been named.[1] References1. ^1 2 {{cite web |title = JPL Small-Body Database Browser: 85182 (1991 AQ) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2085182;cad=1#cad |publisher = Jet Propulsion Laboratory |accessdate = 21 April 2018}} [1][2][3][4][5]2. ^1 2 3 4 5 6 7 {{cite web |title = 85182 (1991 AQ) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=85182 |accessdate = 21 April 2018}} 3. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 21 April 2018}} 4. ^1 2 3 {{cite journal |display-authors = 6 |first1 = C. R. |last1 = Nugent |first2 = A. |last2 = Mainzer |first3 = J. |last3 = Masiero |first4 = J. |last4 = Bauer |first5 = R. M. |last5 = Cutri |first6 = T. |last6 = Grav |first7 = E. |last7 = Kramer |first8 = S. |last8 = Sonnett |first9 = R. |last9 = Stevenson |first10 = E. L. |last10 = Wright |date = December 2015 |title = NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos |url = https://arxiv.org/pdf/1509.02522.pdf |journal = The Astrophysical Journal |volume = 814 |issue = 2 |page = 13 |bibcode = 2015ApJ...814..117N |doi = 10.1088/0004-637X/814/2/117 |arxiv = 1509.02522 |access-date= 21 April 2018}} 5. ^1 2 3 4 5 6 7 8 {{cite web |title = LCDB Data for (85182) |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=85182%7C |accessdate = 21 April 2018}} }} External links
4 : Apollo asteroids|Discoveries by Eleanor F. Helin|Potentially hazardous asteroids|Astronomical objects discovered in 1991 |
| 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。