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...body's path. It is usually given in days or years. The term is mostly used in the discovery and tracking of [[asteroids]] and [[comets]]. Arc length has ...} was thought to be a [[Mars-crossing asteroid]] that could be a threat to Earth, but was later found to be another main-belt asteroid. ...

{{Short description|Triplet of galaxies in the constellation Virgo}} ...54}}<ref name=simbad2>{{cite simbad|title=NGC 5679A|access-date=15 January 2017}}</ref> ...

| discovery_site = ''[[Low Earth orbit]]'' | mp_category = {{nowrap|[[Apollo asteroid|Apollo]]{{·}}[[Near-Earth object|NEO]]{{·}}[[Potentially hazardous object|PHA]]<ref name="jpldata" /> ...

{{Short description|Elliptical galaxy in the constellation Cetus}} | access-date=2017-05-16 }}</ref> ...

{{Short description|Scale for how similar a planet is to earth}} ...Earth Similarity Index values – [[Mercury (planet)|Mercury]], [[Venus]], [[Earth]] and [[Mars]]. Sizes to scale.]] ...

| [[Near-Earth object|NEO]] | epoch = 1 October 2017 ([[Julian day|JD]]&nbsp;2458027.5) ...

...uals this sum, <math>v_{\text{max}}</math> and the relative speed when the objects are very far apart <math>v_{\text{rel}}</math>: ...math>v_{\text{esc}}</math> is the escape velocity. This gives the increase in probability of a collision as a factor of <math>1+v_{\text{esc}}^2/v_{\text ...

{{Use dmy dates|date=June 2017}} |publisher=Near Earth Objects{{Snd}} Dynamic Site ...

{{Short description|Star in the constellation Lynx}} | caption = Location of 10 UMa (circled in red) ...

{{Short description|F-type main sequence star in the constellation Virgo}} ...nstellation)|Virgo]]. It is around 108 [[light year]]s distant from the [[Earth]].<ref name="Borgniet2017"/><ref name="Gaia DR2"/> ...

| discoverer = [[Lincoln Near-Earth Asteroid Research|LINEAR]] | epoch = 4 September 2017 ([[Julian day|JD]] 2458000.5) ...

{{Short description|Temporary satellite of Earth}} | caption = {{mp|2020 CD|3}} imaged in colour by [[Gemini North]] ...

...com/technology/archive/2011/06/early-quasar-is-brightest-object-ever-found-in-the-universe/241294/|access-date=30 June 2011|quote=ULAS J1120+0641 took th ..., with shorter wavelength and higher energy than visible light. The change in energy and wavelength of the light is due to the [[expanding universe]], wh ...

| [[Near-Earth object|NEO]] ...atch]] program at [[Kitt Peak National Observatory]] near Tucson, Arizona, in the United States.<ref name="MPC-object"/> ...

{{Short description|Binary star system in the constellation Hydra}} ...arallax|parallax shift]] of 14.09&nbsp;[[milliarcsecond|mas]] as seen from Earth, it is located around 231&nbsp;[[light year]]s away from the [[Sun]]. It is ...

{{Short description|Star in the constellation Lupus}} ...of 8.97<ref name=vanLeeuwen2007/>&nbsp;[[milliarcsecond|mas]] as seen from Earth, it is located around 360&nbsp;[[light-year]]s from the [[Sun]]. ...

{{Short description|Star in the constellation Draco}} ...pon an annual [[parallax]] shift of {{Val|4.16|ul=mas}} as seen from the [[Earth]],<ref name=GaiaDR2/> the star is located approximately 780&nbsp;[[light-ye ...

...as first observed at [[Mauna Kea Observatory]] on 18 July 1999. Discovered in 2005, its [[minor-planet moon]] is just 3 kilometers smaller than its prima ...o in the "cold" population of cubewanos. As a result, it is likely reddish in color.<ref name="KBOColor" /><ref name="KBOColor2" /> ...

{{Short description|Small temporary satellite of Earth that impacted in 2015}} ...km|mi|abbr=on}} (0.055&nbsp;[[Lunar distance (astronomy)|LD]]; 3.33&nbsp;[[Earth radius|ER]]) ...

...t around the [[planet]] [[Venus]]. Venus has no moon, but several man-made objects orbit the planet. The name is analogous to the term [[geocentric orbit]] for an orbit around Earth and [[heliocentric orbit]] for an orbit around the Sun. The [[apsides]] of ...