| 词条 | (480808) 1994 XL1 |
| 释义 |
| minorplanet = yes | name = (480808) {{mp|1994 XL|1}} | background = #FFC2E0 | image = | image_size = | caption = | discovery_ref = [1][2] | discovered = 6 December 1994 | discoverer = R. H. McNaught | discovery_site = Siding Spring Obs. | mpc_name = (480808) {{mp|1994 XL|1}} | alt_names = {{mp|1994 XL|1}} | pronounced = | named_after = | mp_category = {{nowrap|NEO{{·}}Aten{{·}}PHA [1]}} | orbit_ref = | epoch = 30 January 2013 (JD 2456322.5) | uncertainty = 0 | observation_arc = 21.99 yr (8,033 days) | aphelion = 1.0240 AU | perihelion = 0.3178 AU | semimajor = 0.6709 AU | eccentricity = 0.5263 | period = 0.55 yr (201 days) | mean_anomaly = 205.64° | mean_motion = {{Deg2DMS|1.7936|sup=ms}} / day | inclination = 28.167° | asc_node = 252.68° | arg_peri = 356.54° | moid = 0.0365 AU{{·}}14.2 LD | dimensions = {{val|0.2|u=km}} {{small|(est. at 0.20)}}[6] | rotation = | albedo = | spectral_type = | abs_magnitude = 20.9 }} {{mp|(480808) 1994 XL|1}} is a sub-kilometer asteroid, classified as near-Earth object and potentially hazardous asteroid of the Aten group, approximately {{convert|200|m|ft|abbr=off|sigfig=1|sp=us}} in diameter. It was discovered on 6 December 1994, by Scottish–Australian astronomer Robert McNaught at Siding Spring Observatory in Australia.[1] It was one of the first asteroids discovered to have a semi-major axis less than Venus.{{citation needed|date=August 2017}} Orbit and classification{{mp|1994 XL|1}} orbits the Sun at a distance of 0.3–1.0 AU once every 0 years and 7 months (201 days). Its orbit has an eccentricity of 0.53 and an inclination of 28° with respect to the ecliptic. No precoveries were taken, and no prior identifications were made. The body's observation arc begins with its official discovery observation.[1]Close encounterThe asteroid has an Earth minimum orbital intersection distance of {{convert |0.0365 |AU |km |abbr=on |sigfig=3}}, which translates into 14.2 lunar distances. It passed {{convert |0.03709 |AU |km |abbr=on |lk=off |sigfig=3}} from Earth on 6 December 1994.[12] On 4 December 2044, it will pass again at {{convert|0.03637 |AU |km |abbr=on |lk=off |sigfig=3}} from Earth.[12] Physical characteristics{{mp|1994 XL|1}} has not been observed by any of the space-based surveys such as the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission. Based on a generic magnitude-to-diameter conversion, {{mp|1994 XL|1}} measures approximately 0.2 kilometers in diameter assuming an albedo of 0.20, which is a typical value for stony S-type asteroids.[6]As of 2017, no rotational lightcurve of this object has been obtained. The body's rotation period, shape and poles remain unknown.[15] Naming and numberingAfter its first observation in 1994, this minor planet was numbered 23 year later by the Minor Planet Center on 12 January 2017 ({{small|M.P.C. 112958}}),[16]{{rp|698}} after its last observation with the LCO–A 1-meter global telescope station at Sutherland, South Africa, on 6 December 2016 {{Obscode|K91}}. As of 2018, the asteroid has not been named .[1] References1. ^1 2 3 4 5 {{cite web |title = 480808 (1994 XL1) |work = Minor Planet Center |url = https://www.minorplanetcenter.net/db_search/show_object?object_id=480808 |accessdate = 1 August 2017}} [1][2][3][4][5][6]2. ^1 {{cite web |title = MPC/MPO/MPS Archive |work = Minor Planet Center |url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html |accessdate = 1 August 2017}} 3. ^1 {{cite web |title = MPEC 1994-X04 : 1994 XL1 |work = Minor Planet Center |date = 9 December 1994 |url = https://www.minorplanetcenter.net/mpec/J94/J94X04.html |accessdate = 17 March 2018}} 4. ^1 2 {{cite web |type = 2011-12-17 last obs (arc=17.03 years) |title = JPL Close-Approach Data: (1994 XL1) |url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1994XL1;cad=1#cad |accessdate = 2013-01-23}} 5. ^1 2 {{cite web |title = Asteroid Size Estimator |publisher = CNEOS/JPL |url = https://cneos.jpl.nasa.gov/tools/ast_size_est.html |access-date= 1 August 2017}} 6. ^1 {{cite web |title = LCDB Data for (480808) |publisher = Asteroid Lightcurve Database (LCDB) |url = http://www.minorplanet.info/PHP/GenerateALCDEFPage_Local.php?AstInfo=480808%7C1994+XL1 |accessdate = 1 August 2017}} }} External links
4 : Aten asteroids|Discoveries by Robert H. McNaught|Potentially hazardous asteroids|Astronomical objects discovered in 1994 |
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