About: 2018 XB4

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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.

Attributes	Values
rdf:type	Thing place dbo:Location schema:Place celestial body Planet planet
rdfs:label	2018 XB4 (en)
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)
foaf:name	(en)
foaf:depiction
dcterms:subject	Apollo asteroids Astronomical objects discovered in 2018 Discoveries by Pan-STARRS Near-Earth objects in 2019 Near-Earth objects removed from the Sentry Risk Table Minor planet object articles (unnumbered)
Wikipage page ID	60024439 (xsd:integer)
Wikipage revision ID	1053850368 (xsd:integer)
Link from a Wikipage to another Wikipage	Degree (angle) Julian day Apollo asteroids Astronomical objects discovered in 2018 Discoveries by Pan-STARRS Near-Earth objects in 2019 Near-Earth objects removed from the Sentry Risk Table Monte Carlo method Minor planet object articles (unnumbered) Lunar distance (astronomy) Palermo Technical Impact Hazard Scale Julian year (astronomy) Pan-STARRS Haleakala Observatory Astronomical naming conventions Astronomical unit JPL Horizons On-Line Ephemeris System Near-Earth asteroid Near-Earth object Sentry Risk Table Observation arc NEODyS List of Apollo asteroids 3-sigma Solar elongation
sameAs	2018 XB4 2018 XB4
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:·
thumbnail	wiki-commons:Special:FilePath/2018_XB4-orbit-2019.png?width=300
orbit ref	(en)
discovery ref	(en)
abs magnitude	24 (xsd:integer)
aphelion	1.2848 (astronomicalUnit)
arg peri	92.282000 (xsd:double)
asc node	92.063000 (xsd:double)
background	#FFC2E0 (en)
caption	Orbit of 2018 XB4 with 15-day motion shown (en)
discovered	2018-12-13 (xsd:date)
discoverer	Pan-STARRS
discovery site	Haleakala Observatory
eccentricity	0.199300 (xsd:double)
epoch	2019-04-27 (xsd:date)
image size	255 (xsd:integer)
inclination	8.726300 (xsd:double)
jupiter moid	3.68 (astronomicalUnit)
mean motion	/ day (en)
minorplanet	yes (en)
moid	0.0023 (astronomicalUnit)
mp category	Apollo NEO (en)
observation arc	3628800.0 (second)
perihelion	0.8577 (astronomicalUnit)
period	3.502893600000001E7 (second)
semimajor	1.0712 (astronomicalUnit)
uncertainty	5 (xsd:integer)
has 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)
prov:wasDerivedFrom	wikipedia-en:2018_XB4?oldid=1053850368&ns=0
apoapsis (km)	1.9220334427536E8 (kilometre)
orbital period (μ)	405.0 (day)
periapsis (km)	1.2831009369939E8 (kilometre)
page length (characters) of wiki page	5914 (xsd:nonNegativeInteger)
absolute magnitude	24.000000 (xsd:double)
apoapsis (μ)	192203344275.359985 (xsd:double)
discovery date	2018-12-13 (xsd:date)
epoch	27 April 2019 (JD2458600.5)
orbital period (s)	34992000.000000 (xsd:double)
periapsis (μ)	128310093699.389999 (xsd:double)
discoverer	Pan-STARRS
foaf:isPrimaryTopicOf	wikipedia-en:2018_XB4

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