July 2019 lunar eclipse

July 2019 lunar eclipse
Partial eclipse
Near greatest eclipse from Tilehurst, England, 21:30 UTC
DateJuly 17, 2019
Gamma−0.643
Magnitude0.6544
Saros cycle139 (22 of 81)
Partiality177 minutes, 56 seconds
Penumbral333 minutes, 43 seconds
Contacts (UTC)
P118:43:53
U120:01:43
Greatest21:30:44
U422:59:39
P40:17:36

A partial lunar eclipse occurred at the Moon’s descending node of orbit on Tuesday, July 16, 2019,[1] with an umbral magnitude of 0.6544. 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 3.9 days after apogee (on July 20, 2019, at 20:00 UTC), the Moon's apparent diameter was smaller.[2]

Visibility

The eclipse was completely visible over Africa, eastern Europe, Antarctica, and west, central, and south Asia, seen rising over the South America, western Europe, and west Africa, and setting over east Asia and Australia.[3]


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]

July 16, 2019 Lunar Eclipse Parameters
Parameter Value
Penumbral Magnitude 1.70500
Umbral Magnitude 0.65442
Gamma −0.64300
Sun Right Ascension 07h43m48.8s
Sun Declination +21°17'38.5"
Sun Semi-Diameter 15'44.2"
Sun Equatorial Horizontal Parallax 08.7"
Moon Right Ascension 19h44m00.3s
Moon Declination -21°52'53.0"
Moon Semi-Diameter 14'58.7"
Moon Equatorial Horizontal Parallax 0°54'58.2"
ΔT 69.3 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 July 2019
July 2
Ascending node (new moon)
 July 16
Descending node (full moon)
Total solar eclipse
Solar Saros 127		 Partial lunar eclipse
Lunar Saros 139

Eclipses in 2019

Metonic

Tzolkinex

Half-Saros

Tritos

Lunar Saros 139

Inex

Triad

Lunar eclipses of 2016–2020

This eclipse is a member of a semester series. An eclipse in a semester series of lunar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternating nodes of the Moon's orbit.[5]

The penumbral lunar eclipses on March 23, 2016 and September 16, 2016 occur in the previous lunar year eclipse set, and the penumbral lunar eclipses on June 5, 2020 and November 30, 2020 occur in the next lunar year eclipse set.

Lunar eclipse series sets from 2016 to 2020
Descending node   Ascending node
Saros Date
Viewing 		Type
Chart 		Gamma Saros Date
Viewing 		Type
Chart 		Gamma
109 2016 Aug 18
 Penumbral
 1.5641 114
 2017 Feb 11
 Penumbral
 −1.0255
119
 2017 Aug 07
 Partial
 0.8669 124
 2018 Jan 31
 Total
 −0.3014
129
 2018 Jul 27
 Total
 0.1168 134
 2019 Jan 21
 Total
 0.3684
139
 2019 Jul 16
 Partial
 −0.6430 144
 2020 Jan 10
 Penumbral
 1.0727
149 2020 Jul 05
 Penumbral
 −1.3639

Saros 139

This eclipse is a part of Saros series 139, repeating every 18 years, 11 days, and containing 79 events. The series started with a penumbral lunar eclipse on December 9, 1658. It contains partial eclipses from June 3, 1947 through August 7, 2055; total eclipses from August 17, 2073 through May 30, 2542; and a second set of partial eclipses from June 9, 2560 through August 25, 2686. The series ends at member 75 as a penumbral eclipse on April 13, 3065.

The longest duration of totality will be produced by member 31 at 102 minutes, 39 seconds on November 2, 2199. All eclipses in this series occur at the Moon’s descending node of orbit.[6]

Greatest First
The greatest eclipse of the series will occur on 2199 Nov 02, lasting 102 minutes, 39 seconds.[7] Penumbral Partial Total Central
1658 Dec 09
 1947 Jun 03
 2073 Aug 17
 2109 Sep 09
Last
Central Total Partial Penumbral
2488 Apr 26
 2542 May 30
 2686 Aug 25
 3065 Apr 13

Eclipses are tabulated in three columns; every third eclipse in the same column is one exeligmos apart, so they all cast shadows over approximately the same parts of the Earth.

Half-Saros cycle

A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[8] This lunar eclipse is related to two total solar eclipses of Solar Saros 146.

July 11, 2010 July 22, 2028

See also

References

  1. ^ "July 16–17, 2019 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 2019 Jul 16" (PDF). NASA. Retrieved 17 November 2024.
  4. ^ "Partial Lunar Eclipse of 2019 Jul 16". EclipseWise.com. Retrieved 17 November 2024.
  5. ^ van Gent, R.H. "Solar- and Lunar-Eclipse Predictions from Antiquity to the Present". A Catalogue of Eclipse Cycles. Utrecht University. Retrieved 6 October 2018.
  6. ^ "NASA - Catalog of Lunar Eclipses of Saros 139". eclipse.gsfc.nasa.gov.
  7. ^ Listing of Eclipses of series 139
  8. ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros