2018 XB4 (original) (raw)
2018 XB4 (also written 2018 XB4) is an Apollo near-Earth asteroid roughly 53 meters (170 feet) in diameter. It was discovered on 13 December 2018 when the asteroid was about 0.125 AU (18,700,000 km; 11,600,000 mi) from Earth and had a solar elongation of 146°. It passed closest approach to Earth on 1 January 2019. Of the asteroids discovered in 2018, it had the highest Palermo scale rating at –3.6. In mid-2019 it was recovered which extended the observation arc to 177 days and was removed from the Sentry Risk Table on 12 June 2019. It is now known that on 22 June 2092 the asteroid will pass about 0.033±0.015 AU from Earth.
| Property | Value |
|---|---|
| dbo:Planet/apoapsis | 1.9220334427536E8 (dbd:kilometre) |
| dbo:Planet/orbitalPeriod | 405.0 (dbd:day) |
| dbo:Planet/periapsis | 1.2831009369939E8 (dbd:kilometre) |
| dbo:absoluteMagnitude | 24.000000 (xsd:double) |
| dbo:abstract | 2018 XB4 (also written 2018 XB4) is an Apollo near-Earth asteroid roughly 53 meters (170 feet) in diameter. It was discovered on 13 December 2018 when the asteroid was about 0.125 AU (18,700,000 km; 11,600,000 mi) from Earth and had a solar elongation of 146°. It passed closest approach to Earth on 1 January 2019. Of the asteroids discovered in 2018, it had the highest Palermo scale rating at –3.6. In mid-2019 it was recovered which extended the observation arc to 177 days and was removed from the Sentry Risk Table on 12 June 2019. It is now known that on 22 June 2092 the asteroid will pass about 0.033±0.015 AU from Earth. With a 42-day observation arc, the Sentry Risk Table showed an estimated 1 in 6200 chance of the asteroid impacting Earth on 22 June 2092. The nominal JPL Horizons 22 June 2092 Earth distance was 0.17 AU (25,000,000 km; 16,000,000 mi) with a 3-sigma uncertainty of ±320 million kilometers. A Monte Carlo simulation using Solex 12 with 1000 clones of the asteroid showed that by 2092 the uncertainty region for 2018 XB4 stretched around the entire orbit. NEODyS listed the nominal 22 June 2092 Earth distance as 0.009 AU (1,300,000 km; 840,000 mi). (en) |
| dbo:apoapsis | 192203344275.359985 (xsd:double) |
| dbo:discovered | 2018-12-13 (xsd:date) |
| dbo:discoverer | dbr:Pan-STARRS |
| dbo:epoch | 27 April 2019 (JD2458600.5) |
| dbo:orbitalPeriod | 34992000.000000 (xsd:double) |
| dbo:periapsis | 128310093699.389999 (xsd:double) |
| dbo:thumbnail | wiki-commons:Special:FilePath/2018_XB4-orbit-2019.png?width=300 |
| dbo:wikiPageID | 60024439 (xsd:integer) |
| dbo:wikiPageLength | 5914 (xsd:nonNegativeInteger) |
| dbo:wikiPageRevisionID | 1053850368 (xsd:integer) |
| dbo:wikiPageWikiLink | dbr:Degree_(angle) dbr:Julian_day dbc:Apollo_asteroids dbc:Astronomical_objects_discovered_in_2018 dbc:Discoveries_by_Pan-STARRS dbc:Near-Earth_objects_in_2019 dbc:Near-Earth_objects_removed_from_the_Sentry_Risk_Table dbr:Monte_Carlo_method dbc:Minor_planet_object_articles_(unnumbered) dbr:Lunar_distance_(astronomy) dbr:Palermo_Technical_Impact_Hazard_Scale dbr:Julian_year_(astronomy) dbr:Pan-STARRS dbr:Haleakala_Observatory dbr:Astronomical_naming_conventions dbr:Astronomical_unit dbr:JPL_Horizons_On-Line_Ephemeris_System dbr:Near-Earth_asteroid dbr:Near-Earth_object dbr:Sentry_Risk_Table dbr:Observation_arc dbr:NEODyS dbr:List_of_Apollo_asteroids dbr:3-sigma dbr:Solar_elongation |
| dbp:absMagnitude | 24 (xsd:integer) |
| dbp:aphelion | 1.2848 (dbd:astronomicalUnit) |
| dbp:argPeri | 92.282000 (xsd:double) |
| dbp:ascNode | 92.063000 (xsd:double) |
| dbp:background | #FFC2E0 (en) |
| dbp:caption | Orbit of 2018 XB4 with 15-day motion shown (en) |
| dbp:discovered | 2018-12-13 (xsd:date) |
| dbp:discoverer | dbr:Pan-STARRS |
| dbp:discoveryRef | (en) |
| dbp:discoverySite | dbr:Haleakala_Observatory |
| dbp:eccentricity | 0.199300 (xsd:double) |
| dbp:epoch | 2019-04-27 (xsd:date) |
| dbp:imageSize | 255 (xsd:integer) |
| dbp:inclination | 8.726300 (xsd:double) |
| dbp:jupiterMoid | 3.68 (dbd:astronomicalUnit) |
| dbp:meanMotion | / day (en) |
| dbp:minorplanet | yes (en) |
| dbp:moid | 0.0023 (dbd:astronomicalUnit) |
| dbp:mpCategory | Apollo NEO (en) |
| dbp:observationArc | 3628800.0 (dbd:second) |
| dbp:orbitRef | (en) |
| dbp:perihelion | 0.8577 (dbd:astronomicalUnit) |
| dbp:period | 3.502893600000001E7 (dbd:second) |
| dbp:semimajor | 1.0712 (dbd:astronomicalUnit) |
| dbp:uncertainty | 5 (xsd:integer) |
| dbp:wikiPageUsesTemplate | dbt:2019_in_space dbt:Convert dbt:Deg2DMS dbt:Infobox_planet dbt:JPL_small_body dbt:Mp dbt:NeoDys dbt:Reflist dbt:Small dbt:Small_Solar_System_bodies dbt:Use_dmy_dates dbt:Val dbt:· |
| dct:subject | dbc:Apollo_asteroids dbc:Astronomical_objects_discovered_in_2018 dbc:Discoveries_by_Pan-STARRS dbc:Near-Earth_objects_in_2019 dbc:Near-Earth_objects_removed_from_the_Sentry_Risk_Table dbc:Minor_planet_object_articles_(unnumbered) |
| rdf:type | owl:Thing dbo:Place dbo:Location schema:Place dbo:CelestialBody wikidata:Q634 dbo:Planet |
| rdfs:comment | 2018 XB4 (also written 2018 XB4) is an Apollo near-Earth asteroid roughly 53 meters (170 feet) in diameter. It was discovered on 13 December 2018 when the asteroid was about 0.125 AU (18,700,000 km; 11,600,000 mi) from Earth and had a solar elongation of 146°. It passed closest approach to Earth on 1 January 2019. Of the asteroids discovered in 2018, it had the highest Palermo scale rating at –3.6. In mid-2019 it was recovered which extended the observation arc to 177 days and was removed from the Sentry Risk Table on 12 June 2019. It is now known that on 22 June 2092 the asteroid will pass about 0.033±0.015 AU from Earth. (en) |
| rdfs:label | 2018 XB4 (en) |
| owl:sameAs | wikidata:2018 XB4 https://global.dbpedia.org/id/AQXMy |
| prov:wasDerivedFrom | wikipedia-en:2018_XB4?oldid=1053850368&ns=0 |
| foaf:depiction | wiki-commons:Special:FilePath/2018_XB4-orbit-2019.png |
| foaf:isPrimaryTopicOf | wikipedia-en:2018_XB4 |
| foaf:name | (en) |
| is foaf:primaryTopic of | wikipedia-en:2018_XB4 |
