August 2017 lunar eclipse
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A partial lunar eclipse occurred at the Moon’s descending node of orbit on Monday, August 7, 2017, 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.
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.
| Hourly motion shown right to left | |
| Visibility map |
Gallery
- Reggio Calabria, Italy, 17:36 UTC
- Lysychansk, Ukraine, 17:54 UTC
- Florence, Italy, 17:55 UTC
- Lucerne, Switzerland, 18:16 UTC
- Pune, India At maximum, 18:20 UTC
- Seoul, South Korea, 18:22 UTC
- Omsk, Russia, 18:28 UTC
- Constanța, Romania, 18:43 UTC
- Gdańsk, Poland, 18:50 UTC
- Farasan Island, Saudi Arabia, 18:53 UTC
- Karviná, Czech Republic, 18:56 UTC
- Helsinki, Finland, 18:57 UTC
- Sayada, Tunisia, 19:01 UTC
- Gaborone, Botswana, 19:02 UTC
- Albershausen, Germany, 19:14 UTC
- Rethymno, Greece, 19:21 UTC
- Progression from Oria, Italy
Eclipse details
Shown below is a table displaying details about this particular lunar eclipse. It describes various parameters pertaining to this eclipse.
| 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
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.
| August 7 Descending node (full moon) | August 21 Ascending node (new moon) |
|---|---|
| Partial lunar eclipse Lunar Saros 119 | Total solar eclipse Solar Saros 145 |
Related eclipses
Eclipses in 2017
- A penumbral lunar eclipse on February 11.
- An annular solar eclipse on February 26.
- A partial lunar eclipse on August 7.
- A total solar eclipse on August 21.
Metonic
- Preceded by: Lunar eclipse of October 18, 2013
- Followed by: Lunar eclipse of May 26, 2021
Tzolkinex
- Preceded by: Lunar eclipse of June 26, 2010
- Followed by: Lunar eclipse of September 18, 2024
Half-Saros
- Preceded by: Solar eclipse of August 1, 2008
- Followed by: Solar eclipse of August 12, 2026
Tritos
- Preceded by: Lunar eclipse of September 7, 2006
- Followed by: Lunar eclipse of July 6, 2028
Lunar Saros 119
- Preceded by: Lunar eclipse of July 28, 1999
- Followed by: Lunar eclipse of August 19, 2035
Inex
- Preceded by: Lunar eclipse of August 27, 1988
- Followed by: Lunar eclipse of July 18, 2046
Triad
- Preceded by: Lunar eclipse of October 7, 1930
- Followed by: Lunar eclipse of June 8, 2104
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.
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 119
This eclipse is a part of Saros series 119, repeating every 18 years, 11 days, and containing 82 events. The series started with a penumbral lunar eclipse on October 14, 935 AD. It contains partial eclipses from May 18, 1296 through August 2, 1422; total eclipses from August 13, 1440 through June 15, 1927; and a second set of partial eclipses from June 25, 1945 through August 19, 2035. The series ends at member 82 as a penumbral eclipse on March 25, 2396.
The longest duration of totality was produced by member 49 at 102 minutes, 6 seconds on March 30, 1801. All eclipses in this series occur at the Moon’s descending node of orbit.
| Greatest | First | |||
|---|---|---|---|---|
| The greatest eclipse of the series occurred on 1801 Mar 30, lasting 102 minutes, 6 seconds. | Penumbral | Partial | Total | Central |
| 934 Oct 14 | 1296 May 18 | 1440 Aug 13 | 1512 Sep 25 | |
| Last | ||||
| Central | Total | Partial | Penumbral | |
| 1873 May 12 | 1927 Jun 15 | 2035 Aug 19 | 2396 Mar 25 |
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.
| Series members 49–71 occur between 1801 and 2200: | |||||
|---|---|---|---|---|---|
| 49 | 50 | 51 | |||
| 1801 Mar 30 | 1819 Apr 10 | 1837 Apr 20 | |||
| 52 | 53 | 54 | |||
| 1855 May 02 | 1873 May 12 | 1891 May 23 | |||
| 55 | 56 | 57 | |||
| 1909 Jun 04 | 1927 Jun 15 | 1945 Jun 25 | |||
| 58 | 59 | 60 | |||
| 1963 Jul 06 | 1981 Jul 17 | 1999 Jul 28 | |||
| 61 | 62 | 63 | |||
| 2017 Aug 07 | 2035 Aug 19 | 2053 Aug 29 | |||
| 64 | 65 | 66 | |||
| 2071 Sep 09 | 2089 Sep 19 | 2107 Oct 02 | |||
| 67 | 68 | 69 | |||
| 2125 Oct 12 | 2143 Oct 23 | 2161 Nov 03 | |||
| 70 | 71 | ||||
| 2179 Nov 14 | 2197 Nov 24 | ||||
Tritos series
This eclipse is a part of a tritos cycle, repeating at alternating nodes every 135 synodic months (≈ 3986.63 days, or 11 years minus 1 month). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee), but groupings of 3 tritos cycles (≈ 33 years minus 3 months) come close (≈ 434.044 anomalistic months), so eclipses are similar in these groupings.
| Series members between 1801 and 2200 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1810 Mar 21 (Saros 100) | 1821 Feb 17 (Saros 101) | 1832 Jan 17 (Saros 102) | 1842 Dec 17 (Saros 103) | ||||||
| 1864 Oct 15 (Saros 105) | 1875 Sep 15 (Saros 106) | 1886 Aug 14 (Saros 107) | 1897 Jul 14 (Saros 108) | 1908 Jun 14 (Saros 109) | |||||
| 1919 May 15 (Saros 110) | 1930 Apr 13 (Saros 111) | 1941 Mar 13 (Saros 112) | 1952 Feb 11 (Saros 113) | 1963 Jan 09 (Saros 114) | |||||
| 1973 Dec 10 (Saros 115) | 1984 Nov 08 (Saros 116) | 1995 Oct 08 (Saros 117) | 2006 Sep 07 (Saros 118) | 2017 Aug 07 (Saros 119) | |||||
| 2028 Jul 06 (Saros 120) | 2039 Jun 06 (Saros 121) | 2050 May 06 (Saros 122) | 2061 Apr 04 (Saros 123) | 2072 Mar 04 (Saros 124) | |||||
| 2083 Feb 02 (Saros 125) | 2094 Jan 01 (Saros 126) | 2104 Dec 02 (Saros 127) | 2115 Nov 02 (Saros 128) | 2126 Oct 01 (Saros 129) | |||||
| 2137 Aug 30 (Saros 130) | 2148 Jul 31 (Saros 131) | 2159 Jun 30 (Saros 132) | 2170 May 30 (Saros 133) | 2181 Apr 29 (Saros 134) | |||||
| 2192 Mar 28 (Saros 135) | |||||||||
Inex series
This eclipse is a part of the long period inex cycle, repeating at alternating nodes, every 358 synodic months (≈ 10,571.95 days, or 29 years minus 20 days). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee). However, groupings of 3 inex cycles (≈ 87 years minus 2 months) comes close (≈ 1,151.02 anomalistic months), so eclipses are similar in these groupings.
| Series members between 1801 and 2200 | |||||
|---|---|---|---|---|---|
| 1814 Dec 26 (Saros 112) | 1843 Dec 07 (Saros 113) | 1872 Nov 15 (Saros 114) | |||
| 1901 Oct 27 (Saros 115) | 1930 Oct 07 (Saros 116) | 1959 Sep 17 (Saros 117) | |||
| 1988 Aug 27 (Saros 118) | 2017 Aug 07 (Saros 119) | 2046 Jul 18 (Saros 120) | |||
| 2075 Jun 28 (Saros 121) | 2104 Jun 08 (Saros 122) | 2133 May 19 (Saros 123) | |||
| 2162 Apr 29 (Saros 124) | 2191 Apr 09 (Saros 125) | ||||
Half-Saros cycle
A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros). This lunar eclipse is related to two total solar eclipses of Solar Saros 126.
See also
External links
- Eclipse Predictions by Fred Espenak, NASA/GSFC
- APOD: Aug 9, 2017