August 2017 lunar eclipse

August 2017 lunar eclipse
Partial eclipse
Partiality as viewed from Kuwait City, Kuwait, 19:14 UTC
DateAugust 7, 2017
Gamma0.8668
Magnitude0.2477
Saros cycle119 (62 of 83)
Partiality115 minutes, 15 seconds
Penumbral300 minutes, 54 seconds
Contacts (UTC)
P115:50:02
U117:22:55
Greatest18:20:28
U419:18:10
P420:50:56

A partial lunar eclipse occurred at the Moon’s descending node of orbit on Monday, August 7, 2017,[1] with an umbral magnitude of 0.2477. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A partial lunar eclipse occurs when one part of the Moon is in the Earth's umbra, while the other part is in 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. Occurring about 5.2 days after apogee (on August 2, 2017, at 13:55 UTC), the Moon's apparent diameter was smaller.[2]

Visibility

The eclipse was completely visible over east Africa, Asia, and Australia, seen rising over much of Africa and Europe and setting over the central Pacific Ocean.[3]


Hourly motion shown right to left

Visibility map

Eclipse details

Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[4]

August 7, 2017 Lunar Eclipse Parameters
Parameter Value
Penumbral Magnitude 1.28985
Umbral Magnitude 0.24767
Gamma 0.86690
Sun Right Ascension 09h11m33.0s
Sun Declination +16°12'28.1"
Sun Semi-Diameter 15'46.4"
Sun Equatorial Horizontal Parallax 08.7"
Moon Right Ascension 21h10m53.1s
Moon Declination -15°25'17.2"
Moon Semi-Diameter 15'08.1"
Moon Equatorial Horizontal Parallax 0°55'32.7"
ΔT 68.5 s

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.

Eclipse season of August 2017
August 7
Descending node (full moon)
 August 21
Ascending node (new moon)
Partial lunar eclipse
Lunar Saros 119		 Total solar eclipse
Solar Saros 145

Eclipses in 2017

Metonic

Tzolkinex

Half-Saros

Tritos

Lunar Saros 119

Inex

Triad

Lunar eclipses of 2016–2020

Lunar eclipse series sets from 2016–2020
Descending node   Ascending node
Saros Date Type
Viewing 		Gamma Saros Date
Viewing 		Type
Chart 		Gamma
109 2016 Aug 18
 Penumbral
 1.56406 114
 2017 Feb 11
 Penumbral
 −1.02548
119
 2017 Aug 07
 Partial
 0.86690 124
 2018 Jan 31
 Total
 −0.30143
129
 2018 Jul 27
 Total
 0.11681 134
 2019 Jan 21
 Total
 0.36842
139
 2019 Jul 16
 Partial
 −0.64300 144
 2020 Jan 10
 Penumbral
 1.07270
149 2020 Jul 05
 Penumbral
 −1.36387
Last set 2016 Sep 16 Last set 2016 Mar 23
Next set 2020 Jun 05 Next set 2020 Nov 30

Saros 119

It is part of Saros series 119 (member 61 of 82).

Half-Saros cycle

A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[5] This lunar eclipse is related to two total solar eclipses of Solar Saros 126.

August 1, 2008 August 12, 2026

See also

References

  1. ^ "August 7–8, 2017 Partial Lunar Eclipse". timeanddate. Retrieved 17 November 2024.
  2. ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 17 November 2024.
  3. ^ "Partial Lunar Eclipse of 2017 Aug 07" (PDF). NASA. Retrieved 17 November 2024.
  4. ^ "Partial Lunar Eclipse of 2017 Aug 07". EclipseWise.com. Retrieved 17 November 2024.
  5. ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
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