Partial Lunar Eclipse of 2017 Aug 07

Fred Espenak

Introduction


The Partial Lunar Eclipse of 2017 Aug 07 is visible from the following geographic regions:

  • Europe, Africa, Asia, Australia

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 2017 Aug 07 at 18:21:38 TD (18:20:29 UT1). This is 5.0 days after the Moon reaches apogee. During the eclipse, the Moon is in the constellation Capricornus. The synodic month in which the eclipse takes place has a Brown Lunation Number of 1170.

The eclipse belongs to Saros 119 and is number 61 of 82 eclipses in the series. All eclipses in this series occur at the Moon’s descending node. The Moon moves northward with respect to the node with each succeeding eclipse in the series and gamma increases.

The partial lunar eclipse of 2017 Aug 07 is followed two weeks later by a total solar eclipse on 2017 Aug 21.

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 68.5 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 2017 Aug 07 .


Eclipse Data: Partial Lunar Eclipse of 2017 Aug 07

Eclipse Characteristics
Parameter Value
Penumbral Magnitude 1.28863
Umbral Magnitude 0.24645
Gamma 0.86690
Epsilon 0.8024°
Opposition Times
Event Calendar Date & Time Julian Date
Greatest Eclipse 2017 Aug 07 at 18:21:37.8 TD (18:20:29.3 UT1) 2457973.264227
Ecliptic Opposition 2017 Aug 07 at 18:11:46.1 TD (18:10:37.5 UT1) 2457973.257379
Equatorial Opposition 2017 Aug 07 at 18:41:56.7 TD (18:40:48.2 UT1) 2457973.278335
Geocentric Coordinates of Sun and Moon
2017 Aug 07 at 18:21:37.8 TD (18:20:29.3 UT1)
Coordinate Sun Moon
Right Ascension09h11m33.0s21h10m53.1s
Declination+16°12'28.1"-15°25'17.2"
Semi-Diameter 15'46.4" 15'08.1"
Eq. Hor. Parallax 08.7" 0°55'32.7"
Geocentric Libration of Moon
Angle Value
l -4.2°
b -1.1°
c -18.6°
Earth's Shadows
Parameter Value
Penumbral Radius 1.2003°
Umbral Radius 0.6745°
Prediction Paramaters
Paramater Value
Ephemerides JPL DE406
ΔT 68.5 s
Shadow Rule Danjon
Shadow Enlargement 1.010
Saros Series 119 (61/82)

Explanation of Lunar Eclipse Data Tables

Eclipse Contacts: Partial Lunar Eclipse of 2017 Aug 07

Lunar Eclipse Contacts
Eclipse Event Contact Time
TD
Time
UT1
Zenith Latitude Zenith Longitude Position Angle Axis Distance
Penumbral BeginsP115:51:09.215:50:00.615°41.2'S122°31.7'E 292.1° 1.4515°
Partial BeginsU117:24:04.717:22:56.215°31.4'S100°03.3'E 318.5° 0.9264°
Greatest EclipseGreatest18:21:37.818:20:29.315°25.3'S086°08.2'E 348.5° 0.8024°
Partial EndsU419:19:20.119:18:11.615°19.0'S072°10.9'E 18.5° 0.9272°
Penumbral EndsP420:52:08.020:50:59.415°08.8'S049°44.3'E 45.0° 1.4536°
Eclipse Durations
Eclipse Phase Duration
Penumbral (P4 - P1)05h00m58.8s
Partial (U4 - U1)01h55m15.4s

Explanation of Lunar Eclipse Contacts Table

Polynomial Besselian Elements: Partial Lunar Eclipse of 2017 Aug 07

Polynomial Besselian Elements
2017 Aug 07 at 18:00:00.0 TD (=t0)
n x y d f1 f2 f3
0 -0.33063 0.75158 0.2830 1.20017 0.67441 0.25221
1 0.47283 0.09626 -0.0002 0.00033 0.00032 0.00009
2 0.00017 0.00010 -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 = 18.000

Explanation of Besselian Elements

Links for the Partial Lunar Eclipse of 2017 Aug 07

Links to Additional Lunar Eclipse Information

Eclipse Predictions

Predictions for the Partial Lunar Eclipse of 2017 Aug 07 were generated using the JPL DE406 solar and lunar ephemerides. The lunar coordinates were calculated with respect to the Moon's Center of Mass. 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 68.5 seconds for this eclipse.

Acknowledgments

Some of the content on this web site is based on the book Thousand Year Canon of Lunar Eclipses 1501 to 2500. 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.