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{{Short description|Penumbral lunar eclipse 18 October 2013}}
{{Use dmy dates|date=August 2018}}
{{Infobox lunar eclipse
| type = penumbral
| image = MG 8074 (10353408985) (cropped).jpg
| caption = Penumbral eclipse as viewed from [[Washington, D.C.]], 23:53 UTC
| date = 18 October 2013
| gamma = 1.1508
| magnitude = −0.2706
| saros_ser = 117
| saros_no = 52 of 72
| penumbral = 239 minutes, 6 seconds
| p1 = 21:50:41
| greatest = 23:50:17
| p4 = 1:49:47
| previous = May 2013
| next = April 2014
}}
A penumbral [[lunar eclipse]] occurred at the Moon’s [[Lunar node|descending node]] of orbit on Friday, 18 October 2013,<ref>{{cite web|title=October 18–19, 2013 Penumbral Lunar Eclipse|url=https://www.timeanddate.com/eclipse/lunar/2013-october-18|publisher=timeanddate|access-date=15 November 2024}}</ref> with an umbral [[Magnitude of eclipse|magnitude]] of −0.2706. A lunar eclipse occurs when the [[Moon]] moves into the [[Earth's shadow]], causing the Moon to be darkened. A penumbral lunar eclipse occurs when part or all of the Moon's near side passes into the Earth's penumbra. Unlike a [[solar eclipse]], which can only be viewed from a relatively small area of the world, a lunar eclipse may be viewed from anywhere on the [[night]] side of Earth. The Moon's apparent diameter was near the average diameter because it occurred 8.2 days after [[Apsis|perigee]] (on 10 October 2013, at 19:15 UTC) and 6.9 days before [[Apsis|apogee]] (on 25 October 2013, at 10:25 UTC).<ref>{{cite web|title=Moon Distances for London, United Kingdom, England|url=https://www.timeanddate.com/astronomy/moon/distance.html?year=2013&n=136|publisher=timeanddate|access-date=15 November 2024}}</ref>

== Visibility ==
The eclipse was completely visible over [[Africa]], [[Europe]], eastern [[South America]], and [[west Asia]], seen rising over western [[South America]] and [[North America]] and setting over [[south Asia|south]] and [[east Asia]].<ref>{{cite web|title=Penumbral Lunar Eclipse of 2013 Oct 18|url=https://eclipse.gsfc.nasa.gov/LEplot/LEplot2001/LE2013Oct18N.pdf|publisher=NASA|access-date=15 November 2024}}</ref>

{| class=wikitable width=480
|[[File:Lunar eclipse from moon-2013Oct18.png|315px]] [[File:Lunar eclipse chart close-2013Oct18.png|315px]]
|- align=center
|[[File:Visibility Lunar Eclipse 2013-10-18.png|640px]] Visibility map
|}

== Images ==
[[File:2013-10-18 Lunar Eclipse Sketch.png|thumb|left|NASA chart of the eclipse]]
{{clear}}

== Gallery ==
<gallery>
Penumbral Eclipse in very cloudy skies. (10354279925).jpg|[[Kennesaw, Georgia]], 0:16 UTC
</gallery>

== Eclipse details ==
Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.<ref>{{cite web|title=Penumbral Lunar Eclipse of 2013 Oct 18|url=https://eclipsewise.com/lunar/LEprime/2001-2100/LE2013Oct18Nprime.html|publisher=EclipseWise.com|access-date=15 November 2024}}</ref>

{|class="wikitable" align="{{{align|left}}}" style="margin:{{#ifeq:{{{align}}}|right|0 0 0.5em 1em|0 1em 0.5em 0}}"
|+18 October 2013 Lunar Eclipse Parameters
! Parameter
! Value
|-
| Penumbral Magnitude
| 0.76603
|-
| Umbral Magnitude
| −0.27064
|-
| Gamma
| 1.15082
|-
| Sun Right Ascension
| 13h35m31.9s
|-
| Sun Declination
| -09°57'14.9"
|-
| Sun Semi-Diameter
| 16'03.4"
|-
| Sun Equatorial Horizontal Parallax
| 08.8"
|-
| Moon Right Ascension
| 01h34m19.6s
|-
| Moon Declination
| +11°00'12.1"
|-
| Moon Semi-Diameter
| 15'29.3"
|-
| Moon Equatorial Horizontal Parallax
| 0°56'50.7"
|-
| ΔT
| 67.2 s
|}
{{clear}}

== Eclipse season ==
{{See also|Eclipse cycle}}
This eclipse is part of an [[eclipse season]], a period, roughly every six months, when eclipses occur. Only two (or occasionally three) eclipse seasons occur each year, and each season lasts about 35 days and repeats just short of six months (173 days) later; thus two full eclipse seasons always occur each year. Either two or three eclipses happen each eclipse season. In the sequence below, each eclipse is separated by a [[fortnight]].

{| class="wikitable"
|+ Eclipse season of October–November 2013
! October 18 Descending node (full moon) !! [[Solar eclipse of November 3, 2013|November 3]] Ascending node (new moon) 
|-
| [[File:Lunar eclipse chart close-2013Oct18.png|200px]] || [[File:SE2013Nov03H.png|200px]]
|- align=center
| [[Lunar eclipse#Types of lunar eclipse|Penumbral lunar eclipse]] Lunar Saros 117 || [[Total eclipse#Types|Hybrid solar eclipse]] Solar Saros 143
|}

== Related eclipses ==
=== Eclipses in 2013 ===
* [[April 2013 lunar eclipse|A partial lunar eclipse on 25 April]].
* [[Solar eclipse of May 10, 2013|An annular solar eclipse on 10 May]].
* [[May 2013 lunar eclipse|A penumbral lunar eclipse on 25 May]].
* '''A penumbral lunar eclipse on 18 October.'''
* [[Solar eclipse of November 3, 2013|A hybrid solar eclipse on 3 November]].

=== Metonic ===
* Preceded by: [[December 2009 lunar eclipse|Lunar eclipse of 31 December 2009]]
* Followed by: [[August 2017 lunar eclipse|Lunar eclipse of 7 August 2017]]

=== Tzolkinex ===
* Preceded by: [[September 2006 lunar eclipse|Lunar eclipse of 7 September 2006]]
* Followed by: [[November 2020 lunar eclipse|Lunar eclipse of 30 November 2020]]

=== Half-Saros ===
* Preceded by: [[Solar eclipse of 14 October 2004]]
* Followed by: [[Solar eclipse of 25 October 2022]]

=== Tritos ===
* Preceded by: [[November 2002 lunar eclipse|Lunar eclipse of 20 November 2002]]
* Followed by: [[September 2024 lunar eclipse|Lunar eclipse of 18 September 2024]]

=== Lunar Saros 117 ===
* Preceded by: [[October 1995 lunar eclipse|Lunar eclipse of 8 October 1995]]
* Followed by: [[October 2031 lunar eclipse|Lunar eclipse of 30 October 2031]]

=== Inex ===
* Preceded by: [[November 1984 lunar eclipse|Lunar eclipse of 8 November 1984]]
* Followed by: [[September 2042 lunar eclipse|Lunar eclipse of 29 September 2042]]

=== Triad ===
* Preceded by: [[December 1926 lunar eclipse|Lunar eclipse of 19 December 1926]]
* Followed by: [[August 2100 lunar eclipse|Lunar eclipse of 19 August 2100]]

=== Lunar eclipses of 2013–2016 ===
{{Lunar eclipse set 2013-2016}}

=== Saros 117 ===
{{Lunar Saros series 117}}

=== Tritos series ===
{{Lunar Tritos series November 2002}}

=== Inex series ===
{{Lunar Inex series October 2013}}

=== Half-Saros cycle ===
A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a [[Saros (astronomy)#Relationship between lunar and solar saros .28sar.29|half saros]]).<ref>Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, ''The half-saros''</ref> This lunar eclipse is related to two partial solar eclipses of [[Solar Saros 124]].
{| class=wikitable
![[Solar eclipse of October 14, 2004|October 14, 2004]]
![[Solar eclipse of October 25, 2022|October 25, 2022]]
|-
|[[File:SE2004Oct14P.png|240px]]
|[[File:SE2022Oct25P.png|240px]]
|}

== See also ==
*[[List of lunar eclipses]] and [[List of 21st-century lunar eclipses]]

== References ==
{{reflist}}

== External links==
* {{LEplot2001 link|2013|Oct|18|N}}
* [http://www.hermit.org/Eclipse/when_lunars.html Hermit eclipse: 23 Mar 2016 – Penumbral Lunar Eclipse]
* [http://www.eclipsegeeks.com/lunar-eclipse-october-2013/4580168583 Eclipse Geeks Penumbra Lunar Eclipse 18/19 October 2013] {{Webarchive|url=https://web.archive.org/web/20200225120644/http://www.eclipsegeeks.com/lunar-eclipse-october-2013/4580168583 |date=25 February 2020 }}

{{Commons category|Lunar eclipse of 2013 October 18}}
{{Lunar eclipses}}

{{DEFAULTSORT:Lunar eclipse 2013-10}}
[[Category:21st-century lunar eclipses|2013-10]]
[[Category:2013 in science]]

October 2013 lunar eclipse - Revision history

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