580 Selene

{{Short description|Outer main-belt asteroid}}

{{Use dmy dates|date=October 2019}}

{{Infobox planet

| minorplanet= yes

| background= #D6D6D6

| name= 580 Selene

| mpc_name= (580) Selene

| pronounced={{IPAc-en|s|@|ˈ|l|iː|n|iː}}{{Cite encyclopedia |url=http://www.lexico.com/definition/Selene |archive-url=https://web.archive.org/web/20200322185835/https://www.lexico.com/definition/selene |url-status=dead |archive-date=22 March 2020 |title=Selene |dictionary=Lexico UK English Dictionary |publisher=Oxford University Press}}

| alt_names= 1905 SE

| discoverer= M. F. Wolf

| discovered= 17 December 1905

| discovery_site= Heidelberg

| epoch= 31 July 2016 (JD 2457600.5)

| eccentricity= 0.082713

| semimajor= {{Convert|3.2300|AU|Gm|abbr=on}}

| perihelion= {{Convert|2.9628|AU|Gm|abbr=on}}

| aphelion= {{Convert|3.4971|AU|Gm|abbr=on|lk=on}}

| period= 5.81 yr (2120.3 d)

| inclination= 3.6614°

| asc_node= 99.154°

| arg_peri= 334.542°

| mean_anomaly= 45.310°

| mean_motion= {{Deg2DMS|0.16979|sup=ms}} / day

| orbit_ref= {{Cite web |url=https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=580;cad=1 |title=580 Selene (1905 SE) |work=JPL Small-Body Database |publisher=NASA/Jet Propulsion Laboratory |access-date=5 May 2016}}

| observation_arc= 110.29 yr (40283 d)

| uncertainty= 0

| abs_magnitude= 10.3

| rotation= {{Convert|9.47|h|d|abbr=on|lk=on}}

| albedo= {{val|0.1218|0.019}}

| mean_radius= {{val|22.895|1.6}} km

}}

580 Selene is a minor planet orbiting the Sun in the asteroid belt. The name Selene is that of an ancient Greek goddess of the Moon.{{cite book|title=Dictionary of Minor Planet Names – (580) Selene|last=Schmadel|first=Lutz D.|publisher=Springer Berlin Heidelberg|page=160|date=2003|isbn=978-3-540-29925-7|doi=10.1007/978-3-540-29925-7_581|chapter = (580) Selene}} The name may have been inspired by the asteroid's provisional designation 1905 SE.

This body orbits the Sun nearly midway between the orbits of Mars and Jupiter. The orbital eccentricity is slightly lower than that of Mars. Based on its light curve, Selene has an estimated rotation period of 0.3947±0.0004 days, or just under 9.5 hours.{{cite web

| last = Antonini

| first = Pierre

| date = 2005-05-16

| url = http://obswww.unige.ch/~behrend/page2cou.html#000580

| title = Courbes de rotation d'astéroïdes et de comètes

| publisher = Observatoire de Genève

| language = fr

| access-date = 2006-06-12

| archive-url= https://web.archive.org/web/20060708233543/http://obswww.unige.ch/~behrend/page2cou.html| archive-date= 8 July 2006 | url-status= live}} During each rotation, the apparent magnitude varies by 0.27. The approximate diameter of this asteroid is 46 km.{{cite web

|date = 2005-01-18

|url = http://occsec.wellington.net.nz/planet/2005/updates/050209_580_2964_u.htm

|title = Occultation by (580) Selene

|publisher = RASNZ Occultation Section

|access-date = 2006-06-12

|url-status = dead

|archive-url = https://web.archive.org/web/20051221082953/http://occsec.wellington.net.nz/planet/2005/updates/050209_580_2964_u.htm

|archive-date = 2005-12-21

}} (Some sources list a diameter of up to 56 km.) The albedo is about 7%, comparable to that of the Earth's Moon.