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August 2007 lunar eclipse

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August 2007 lunar eclipse
Total eclipse
The eclipse as viewed from Wollongong, Australia at 9:48 UTC, shortly before totality
DateAugust 28, 2007
Gamma−0.2145
Magnitude1.4777
Saros cycle128 (40 of 71)
Totality90 minutes, 1 second
Partiality212 minutes, 12 seconds
Penumbral327 minutes, 17 seconds
Contacts (UTC)
P17:53:40
U18:51:16
U29:52:21
Greatest10:37:21
U311:22:22
U412:23:28
P413:20:57

A total lunar eclipse occurred at the Moon’s ascending node of orbit on Tuesday, August 28, 2007,[1] with an umbral magnitude of 1.4777. It was a central lunar eclipse, in which part of the Moon passed through the center of the Earth's shadow. 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 shadow is smaller. Occurring about 2.4 days before perigee (on August 30, 2007, at 20:10 UTC), the Moon's apparent diameter was larger.[2]

This was the most recent central lunar eclipse of Saros series 128 as well as the "longest and deepest lunar eclipse to be seen in 7 years". In the total lunar eclipse of July 16, 2000 the moon passed within two arc minutes of the center of the Earth's shadow. In comparison, this still very deep eclipse was off-center by over 12 minutes of arc.[3] The next total lunar eclipse of a longer duration was on June 15, 2011.

Visibility

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Viewing from Oceania was favored for the eclipse, because at the moment of greatest eclipse (10:37:22 UTC), the Moon was at the zenith of French Polynesia. The Pacific regions of Canada and the continental United States (including all of Alaska) witnessed the whole event, along with most of eastern Australia, New Zealand and all the Pacific Island regions (except New Guinea), and the tip of the Chukchi Peninsula that includes the town of Uelen, Russia. The majority of the Americas observed an abbreviated eclipse, with moonset occurring at some time during the eclipse. Siberia, far eastern Russia, eastern South Asia, China, the rest of eastern and southeastern Asia, New Guinea, and the rest of Australia missed out on the beginning of the eclipse, because the eclipse occurred at or close to moonrise in those regions.[4]

Luzon (except Visayas and Mindanao) in the Philippines, particularly Metro Manila, missed the rare eclipse entirely, due to clouds in the area due to the rainy season, which saddened many eclipse watchers in the area, but the eclipse was sighted by other amateur astronomers in other parts of the country as the lunar eclipse seen in clear skies. The eclipse was also missed in New Guinea, especially Port Moresby because of clouds. Greenland, Europe (including western Russia), Africa, western Asia, western Central Asia, and western South Asia missed the eclipse completely.[5]


Hourly motion shown right to left
The Moon's hourly motion across the Earth's shadow in the constellation of Aquarius.

Visibility map

Images

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NASA chart of the eclipse
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Collages

From the Oregon Coast.
From Swifts Creek, Australia.
(3 minute intervals)

From Bakersfield, California.

Eclipse details

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Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[6]

August 28, 2007 Lunar Eclipse Parameters
Parameter Value
Penumbral Magnitude 2.45448
Umbral Magnitude 1.47769
Gamma −0.21456
Sun Right Ascension 10h26m26.9s
Sun Declination +09°45'56.7"
Sun Semi-Diameter 15'50.0"
Sun Equatorial Horizontal Parallax 08.7"
Moon Right Ascension 22h26m50.4s
Moon Declination -09°57'18.5"
Moon Semi-Diameter 16'12.5"
Moon Equatorial Horizontal Parallax 0°59'29.2"
ΔT 65.4 s

Eclipse season

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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–September 2007
August 28
Ascending node (full moon)
 September 11
Descending node (new moon)
Total lunar eclipse
Lunar Saros 128		 Partial solar eclipse
Solar Saros 154
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Eclipses in 2007

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Metonic

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Tzolkinex

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Half-Saros

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Tritos

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Lunar Saros 128

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Inex

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Triad

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Lunar eclipses of 2006–2009

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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.[7]

The lunar eclipses on July 7, 2009 (penumbral) and December 31, 2009 (partial) occur in the next lunar year eclipse set.

Lunar eclipse series sets from 2006 to 2009
Descending node   Ascending node
Saros Date
Viewing 		Type
Chart 		Gamma Saros Date
Viewing 		Type
Chart 		Gamma
113
 2006 Mar 14
 Penumbral
 1.0211 118
 2006 Sep 7
 Partial
 −0.9262
123
 2007 Mar 03
 Total
 0.3175 128
 2007 Aug 28
 Total
 −0.2146
133
 2008 Feb 21
 Total
 −0.3992 138
 2008 Aug 16
 Partial
 0.5646
143
 2009 Feb 09
 Penumbral
 −1.0640 148
 2009 Aug 06
 Penumbral
 1.3572

Metonic series

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The Metonic cycle repeats nearly exactly every 19 years and represents a Saros cycle plus one lunar year. Because it occurs on the same calendar date, the Earth's shadow will be in nearly the same location relative to the background stars.

  1. 1988 Mar 03.675 – Partial (113)
  2. 2007 Mar 03.972 – Total (123)
  3. 2026 Mar 03.481 – Total (133)
  4. 2045 Mar 03.320 – Penumbral (143)
  1. 1988 Aug 27.461 – partial (118)
  2. 2007 Aug 28.442 – total (128)
  3. 2026 Aug 28.175 – partial (138)
  4. 2045 Aug 27.578 – penumbral (148)

Saros 128

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This eclipse is a part of Saros series 128, repeating every 18 years, 11 days, and containing 71 events. The series started with a penumbral lunar eclipse on June 18, 1304. It contains partial eclipses from September 2, 1430 through May 11, 1827; total eclipses from May 21, 1845 through October 21, 2097; and a second set of partial eclipses from November 2, 2115 through May 17, 2440. The series ends at member 71 as a penumbral eclipse on August 2, 2566.

The longest duration of totality was produced by member 37 at 100 minutes, 43 seconds on July 26, 1953. All eclipses in this series occur at the Moon’s ascending node of orbit.[8]

Greatest First

The greatest eclipse of the series occurred on 1953 Jul 26, lasting 100 minutes, 43 seconds.[9] 		Penumbral Partial Total Central
1304 Jun 18
 1430 Sep 02
 1845 May 21
 1899 Jun 23
Last
Central Total Partial Penumbral
2007 Aug 28
 2097 Oct 21
 2440 May 17
 2566 Aug 02

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.

Tritos series

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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
1811 Mar 10
(Saros 110) 		1822 Feb 06
(Saros 111) 		1833 Jan 06
(Saros 112) 		1843 Dec 07
(Saros 113) 		1854 Nov 04
(Saros 114)
1865 Oct 04
(Saros 115) 		1876 Sep 03
(Saros 116) 		1887 Aug 03
(Saros 117) 		1898 Jul 03
(Saros 118) 		1909 Jun 04
(Saros 119)
1920 May 03
(Saros 120) 		1931 Apr 02
(Saros 121) 		1942 Mar 03
(Saros 122) 		1953 Jan 29
(Saros 123) 		1963 Dec 30
(Saros 124)
1974 Nov 29
(Saros 125) 		1985 Oct 28
(Saros 126) 		1996 Sep 27
(Saros 127) 		2007 Aug 28
(Saros 128) 		2018 Jul 27
(Saros 129)
2029 Jun 26
(Saros 130) 		2040 May 26
(Saros 131) 		2051 Apr 26
(Saros 132) 		2062 Mar 25
(Saros 133) 		2073 Feb 22
(Saros 134)
2084 Jan 22
(Saros 135) 		2094 Dec 21
(Saros 136) 		2105 Nov 21
(Saros 137) 		2116 Oct 21
(Saros 138) 		2127 Sep 20
(Saros 139)
2138 Aug 20
(Saros 140) 		2149 Jul 20
(Saros 141) 		2160 Jun 18
(Saros 142) 		2171 May 19
(Saros 143) 		2182 Apr 18
(Saros 144)
2193 Mar 17
(Saros 145)

Half-Saros cycle

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A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[10] This lunar eclipse is related to two annular solar eclipses of Solar Saros 135.

August 22, 1998 September 1, 2016

See also

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Notes

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  1. ^ "August 27–28, 2007 Total Lunar Eclipse (Blood Moon)". timeanddate. Retrieved 14 November 2024.
  2. ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 14 November 2024.
  3. ^ Visibility Map[dead link‍] for Total Lunar Eclipse of 16 July 2000
  4. ^ Visibility Map[dead link‍] for Total Lunar Eclipse of 28 August 2007
  5. ^ "Total Lunar Eclipse of 2007 Aug 28" (PDF). NASA. Retrieved 14 November 2024.
  6. ^ "Total Lunar Eclipse of 2007 Aug 28". EclipseWise.com. Retrieved 14 November 2024.
  7. ^ 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.
  8. ^ "NASA - Catalog of Lunar Eclipses of Saros 128". eclipse.gsfc.nasa.gov.
  9. ^ Listing of Eclipses of series 128
  10. ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
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