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{{short description|Astronomical event}}
{{Infobox lunar eclipse
| type = total
| image = Lunar eclipse chart close-1986Oct17.png
| caption = The Moon's hourly motion shown right to left
| date = October 17, 1986
| gamma = 0.3189
| magnitude = 1.2455
| saros_ser = 136
| saros_no = 18 of 72
| totality = 73 minutes, 41 seconds
| partiality = 216 minutes, 48 seconds
| penumbral = 353 minutes, 12 seconds
| p1 = 16:21:26
| u1 = 17:29:33
| u2 = 18:41:07
| greatest = 19:17:59
| u3 = 19:54:48
| u4 = 21:06:22
| p4 = 22:14:38
| previous = April 1986
| next = April 1987
}}
A total [[lunar eclipse]] occurred at the Moon’s [[Lunar node|ascending node]] of orbit on Friday, October 17, 1986,<ref>{{cite web|title=October 17–18, 1986 Total Lunar Eclipse (Blood Moon)|url=https://www.timeanddate.com/eclipse/lunar/1986-october-17|publisher=timeanddate|access-date=6 January 2025}}</ref> with an umbral [[Magnitude of eclipse|magnitude]] of 1.2455. A lunar eclipse occurs when the [[Moon]] moves into the [[Earth's shadow]], causing the Moon to be darkened. A total lunar eclipse occurs when the Moon's near side entirely passes into the Earth's umbral shadow. 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. A total lunar eclipse can last up to nearly two hours, while a total solar eclipse lasts only a few minutes at any given place, because the Moon's [[Umbra, penumbra and antumbra|shadow]] is smaller. Occurring about 5.5 days before [[Apsis|apogee]] (on October 23, 1986, at 6:35 UTC), the Moon's apparent diameter was smaller.<ref>{{cite web|title=Moon Distances for London, United Kingdom, England|url=https://www.timeanddate.com/astronomy/moon/distance.html?year=1986&n=136|publisher=timeanddate|access-date=6 January 2025}}</ref>

This lunar eclipse was the last of a [[Tetrad (astronomy)|tetrad]], with four total lunar eclipses in series, the others being on [[May 1985 lunar eclipse|May 4, 1985]]; [[October 1985 lunar eclipse|October 28, 1985]]; and [[April 1986 lunar eclipse|April 24, 1986]].

== Visibility ==
The eclipse was completely visible over [[east Africa]], [[eastern Europe]], and [[Asia]], seen rising over northeastern [[North America]], eastern [[South America]], [[western Europe]], and [[west Africa]] and setting over [[Australia]], [[northeast Asia]], and the western [[Pacific Ocean]].<ref>{{cite web|title=Total Lunar Eclipse of 1986 Oct 17|url=https://eclipse.gsfc.nasa.gov/LEplot/LEplot1951/LE1986Oct17T.pdf|publisher=NASA|access-date=6 January 2025}}</ref>

{| class=wikitable
|[[File:Lunar eclipse from moon-1986Oct17.png|300px]] [[File:Lunar eclipse chart close-1986Oct17.png|300px]]
|}

== Eclipse details ==
Shown below is a table displaying details about this particular lunar eclipse. It describes various parameters pertaining to this eclipse.<ref>{{cite web|title=Total Lunar Eclipse of 1986 Oct 17|url=https://eclipsewise.com/lunar/LEprime/1901-2000/LE1986Oct17Tprime.html|publisher=EclipseWise.com|access-date=6 January 2025}}</ref>

{|class="wikitable" align="{{{align|left}}}" style="margin:{{#ifeq:{{{align}}}|right|0 0 0.5em 1em|0 1em 0.5em 0}}"
|+October 17, 1986 Lunar Eclipse Parameters
! Parameter
! Value
|-
| Penumbral Magnitude
| 2.30082
|-
| Umbral Magnitude
| 1.24545
|-
| Gamma
| 0.31887
|-
| Sun Right Ascension
| 13h29m20.1s
|-
| Sun Declination
| -09°21'26.2"
|-
| Sun Semi-Diameter
| 16'03.1"
|-
| Sun Equatorial Horizontal Parallax
| 08.8"
|-
| Moon Right Ascension
| 01h28m47.0s
|-
| Moon Declination
| +09°37'14.9"
|-
| Moon Semi-Diameter
| 15'12.6"
|-
| Moon Equatorial Horizontal Parallax
| 0°55'49.1"
|-
| ΔT
| 55.2 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 1986
! [[Solar eclipse of October 3, 1986|October 3]] Descending node (new moon) !! October 17 Ascending node (full moon) 
|-
| [[File:SE1986Oct03H.png|200px]] || [[File:Lunar eclipse chart close-1986Oct17.png|200px]]
|- align=center
| [[Total eclipse#Types|Hybrid solar eclipse]] Solar Saros 124 || [[Lunar eclipse#Types of lunar eclipse|Total lunar eclipse]] Lunar Saros 136
|}

== Related eclipses ==
=== Eclipses in 1986 ===
* [[Solar eclipse of April 9, 1986|A partial solar eclipse on April 9]].
* [[April 1986 lunar eclipse|A total lunar eclipse on April 24]].
* [[Solar eclipse of October 3, 1986|A hybrid solar eclipse on October 3]].
* '''A total lunar eclipse on October 17.'''

=== Metonic ===
* Preceded by: [[December 1982 lunar eclipse|Lunar eclipse of December 30, 1982]]
* Followed by: [[August 1990 lunar eclipse|Lunar eclipse of August 6, 1990]]

=== Tzolkinex ===
* Preceded by: [[September 1979 lunar eclipse|Lunar eclipse of September 6, 1979]]
* Followed by: [[November 1993 lunar eclipse|Lunar eclipse of November 29, 1993]]

=== Half-Saros ===
* Preceded by: [[Solar eclipse of October 12, 1977]]
* Followed by: [[Solar eclipse of October 24, 1995]]

=== Tritos ===
* Preceded by: [[November 1975 lunar eclipse|Lunar eclipse of November 18, 1975]]
* Followed by: [[September 1997 lunar eclipse|Lunar eclipse of September 16, 1997]]

=== Lunar Saros 136 ===
* Preceded by: [[October 1968 lunar eclipse|Lunar eclipse of October 6, 1968]]
* Followed by: [[October 2004 lunar eclipse|Lunar eclipse of October 28, 2004]]

=== Inex ===
* Preceded by: [[November 1957 lunar eclipse|Lunar eclipse of November 7, 1957]]
* Followed by: [[September 2015 lunar eclipse|Lunar eclipse of September 28, 2015]]

=== Triad ===
* Preceded by: [[December 1899 lunar eclipse|Lunar eclipse of December 17, 1899]]
* Followed by: [[August 2073 lunar eclipse|Lunar eclipse of August 17, 2073]]

=== Lunar eclipses of 1984–1987 ===
{{Lunar eclipse set 1984-1987}}

=== Metonic series ===
{{Metonic lunar eclipse 1948-2005}}

=== Saros 136 ===
{{Lunar Saros series 136}}

=== Tritos series ===
{{Lunar Tritos series August 2008}}

=== Inex series ===
{{Lunar Inex series September 2015}}

=== 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 total solar eclipses of [[Solar Saros 143]].
{| class=wikitable
![[Solar eclipse of October 12, 1977|October 12, 1977]]
![[Solar eclipse of October 24, 1995|October 24, 1995]]
|-
|[[File:SE1977Oct12T.png|240px]]
|[[File:SE1995Oct24T.png|240px]]
|}

== See also ==
*[[List of lunar eclipses]]
*[[List of 20th-century lunar eclipses]]

== Notes ==
{{reflist}}

==External links ==
* {{LEplot1951 link|1986|Oct|17|T}}

{{Lunar eclipses}}

{{DEFAULTSORT:Lunar eclipse 1986-10}}
[[Category:20th-century lunar eclipses|1986-10]]
[[Category:1986 in science]]
[[Category:October 1986]]

October 1986 lunar eclipse - Revision history

imported>BunnysBot: Fix CW Errors with GenFixes (T1), removed stub tag