Partial Lunar Eclipse of 2026 Aug 28

Fred Espenak

Key to Lunar Eclipse Figure (below)

Introduction

The Partial Lunar Eclipse of 2026 Aug 28 is visible from the following geographic regions:

  • eastern Pacific, Americas, Europe, Africa

The diagram to the right depicts the Moon's path with respect to Earth's umbral and penumbral shadows. Below it is a map showing the geographic regions of eclipse visibility. Click on the figure to enlarge it. For an explanation of the features appearing in the figure, see Key to Lunar Eclipse Figures.

The instant of greatest eclipse takes place on 2026 Aug 28 at 04:14:04 TD (04:12:52 UT1). This is 5.8 days after the Moon reaches apogee. During the eclipse, the Moon is in the constellation Aquarius. The synodic month in which the eclipse takes place has a Brown Lunation Number of 1282.

The eclipse belongs to Saros 138 and is number 29 of 82 eclipses in the series. All eclipses in this series occur at the Moon’s ascending node. The Moon moves southward with respect to the node with each succeeding eclipse in the series and gamma decreases.

This is a very deep partial eclipse. It has an umbral eclipse magnitude of 0.9319 and a partial eclipse duration of 198.8 minutes. Gamma has a value of 0.4964.

The partial lunar eclipse of 2026 Aug 28 is preceded two weeks earlier by a total solar eclipse on 2026 Aug 12.

These eclipses all take place during a single eclipse season.

The eclipse predictions are given in both Terrestrial Dynamical Time (TD) and Universal Time (UT1). The parameter ΔT is used to convert between these two times (i.e., TD = UT1 + ΔT). ΔT has a value of 72.3 seconds for this eclipse.

The following links provide maps and data for the eclipse.

The tables below contain detailed predictions and additional information on the Partial Lunar Eclipse of 2026 Aug 28 .

Eclipse Data: Partial Lunar Eclipse of 2026 Aug 28

Eclipse Characteristics
Parameter Value
Penumbral Magnitude 1.96645
Umbral Magnitude 0.93187
Gamma 0.49644
Epsilon 0.4647°
Opposition Times
Event Calendar Date & Time Julian Date
Greatest Eclipse 2026 Aug 28 at 04:14:04.3 TD (04:12:52.0 UT1) 2461280.675601
Ecliptic Opposition 2026 Aug 28 at 04:19:41.4 TD (04:18:29.0 UT1) 2461280.679503
Equatorial Opposition 2026 Aug 28 at 04:42:57.6 TD (04:41:45.3 UT1) 2461280.695663
Geocentric Coordinates of Sun and Moon
2026 Aug 28 at 04:14:04.3 TD (04:12:52.0 UT1)
Coordinate Sun Moon
Right Ascension10h26m57.9s22h26m06.3s
Declination+09°42'52.7"-09°18'03.6"
Semi-Diameter 15'50.0" 15'18.2"
Eq. Hor. Parallax 08.7" 0°56'09.9"
Geocentric Libration of Moon
Angle Value
l -4.6°
b -0.6°
c -19.9°
Earth's Shadows
Parameter Value
Penumbral Radius 1.2152°
Umbral Radius 0.6874°
Prediction Paramaters
Paramater Value
Ephemerides JPL DE430
ΔT 72.3 s
Shadow Rule Herald/Sinnott
Shadow Enlargement 1.000
Saros Series 138 (29/82)

Explanation of Lunar Eclipse Data Tables

Eclipse Contacts: Partial Lunar Eclipse of 2026 Aug 28

Lunar Eclipse Contacts
Eclipse Event Contact Time
TD		 Time
UT1		 Zenith Latitude Zenith Longitude Position Angle Axis Distance
Penumbral BeginsP101:24:41.401:23:29.009°58.5'S022°00.0'W 261.3° 1.4688°
Partial BeginsU102:34:33.802:33:21.409°41.8'S038°57.1'W 272.5° 0.9417°
Greatest EclipseGreatest04:14:04.304:12:52.009°18.1'S063°05.6'W 332.9° 0.4647°
Partial EndsU405:53:21.705:52:09.308°54.2'S087°11.0'W 33.3° 0.9411°
Penumbral EndsP407:03:12.207:01:59.808°37.3'S104°07.8'W 44.4° 1.4700°
Eclipse Durations
Eclipse Phase Duration
Penumbral (P4 - P1)05h38m30.8s
Partial (U4 - U1)03h18m47.9s

Explanation of Lunar Eclipse Contacts Table

Polynomial Besselian Elements: Partial Lunar Eclipse of 2026 Aug 28

Polynomial Besselian Elements
2026 Aug 28 at 04:00:00.0 TD (=t0)
n x y d f1 f2 f3
0 -0.31496 0.36075 0.1696 1.21507 0.68730 0.25504
1 0.43976 0.22521 -0.0003 0.00037 0.00037 0.00010
2 0.00017 0.00013 -0.0000 0.00000 0.00000 0.00000
3 -0.00001 -0.00000 - - - -

At time t1 (decimal hours), each besselian element is evaluated by:

x = x0 + x1*t + x2*t2 + x3*t3 (or x = Σ [xn*tn]; n = 0 to 3)

where: t = t1 - t0 (decimal hours) and t0 = 4.000

Explanation of Besselian Elements

Eclipse Publications

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For more visit: AstroPixels Publishing


Links for the Partial Lunar Eclipse of 2026 Aug 28

Links to Additional Lunar Eclipse Information

• Decade Tables of Lunar Eclipses:
| 1901 - 1910 | 1911 - 1919 | 1921 - 1930 | 1931 - 1940 | 1941 - 1950 |
| 1951 - 1960 | 1961 - 1970 | 1971 - 1980 | 1981 - 1990 | 1991 - 2000 |
| 2001 - 2010 | 2011 - 2020 | 2021 - 2030 | 2031 - 2040 | 2041 - 2050 |
| 2051 - 2060 | 2061 - 2070 | 2071 - 2080 | 2081 - 2090 | 2091 - 2100 |

Lunar Eclipse Publications

Eclipse Predictions

Predictions for the Partial Lunar Eclipse of 2026 Aug 28 were generated using the JPL DE430 solar and lunar ephemerides. The lunar coordinates were calculated with respect to the Moon's Center of Mass.

The elliptical shape of Earth's umbral and penumbral shadows were calculated using the Herald/Sinnott method of modeling Earth's shadows to compensate for the opacity of the terrestrial atmosphere (including the oblateness of Earth).

The predictions are given in both Terrestrial Dynamical Time (TD) and Universal Time (UT1). The parameter ΔT is used to convert between these two times (i.e., UT1 = TD - ΔT). ΔT has a value of 72.3 seconds for this eclipse.

Acknowledgments

Some of the content on this web site is based on the book 21st Century Canon of Lunar Eclipses. All eclipse calculations are by Fred Espenak, and he assumes full responsibility for their accuracy.

Permission is granted to reproduce eclipse data when accompanied by a link to this page and an acknowledgment:

"Eclipse Predictions by Fred Espenak, www.EclipseWise.com"

The use of diagrams and maps is permitted provided that they are NOT altered (except for re-sizing) and the embedded credit line is NOT removed or covered.