Penumbral Lunar Eclipse of 1984 Jun 13

Fred Espenak

Introduction


The Penumbral Lunar Eclipse of 1984 Jun 13 is visible from the following geographic regions:

  • eastern Asia, Australia, Pacific

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 1984 Jun 13 at 14:26:38 TD (14:25:44 UT1). This is 6.1 days after the Moon reaches perigee. During the eclipse, the Moon is in the constellation Ophiuchus. The synodic month in which the eclipse takes place has a Brown Lunation Number of 760.

The eclipse belongs to Saros 149 and is number 1 of 71 eclipses in the series. Thus, the 1984 Jun 13 event is the very first eclipse of 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.

This is a very shallow penumbral eclipse. It has a penumbral eclipse magnitude of only 0.0647 and a penumbral eclipse duration of 73.0 minutes. Gamma has a value of -1.5240.

The penumbral lunar eclipse of 1984 Jun 13 is preceded two weeks earlier by a annular solar eclipse on 1984 May 30.

Another lunar eclipse occurs one synodic month before the 1984 Jun 13 eclipse. It is the penumbral lunar eclipse of 1984 May 15.

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 54.0 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 Penumbral Lunar Eclipse of 1984 Jun 13 .


Eclipse Data: Penumbral Lunar Eclipse of 1984 Jun 13

Eclipse Characteristics
Parameter Value
Penumbral Magnitude 0.06474
Umbral Magnitude-0.94137
Gamma-1.52403
Epsilon 1.4589°
Opposition Times
Event Calendar Date & Time Julian Date
Greatest Eclipse 1984 Jun 13 at 14:26:38.3 TD (14:25:44.3 UT1) 2445865.101207
Ecliptic Opposition 1984 Jun 13 at 14:42:41.5 TD (14:41:47.5 UT1) 2445865.112355
Equatorial Opposition 1984 Jun 13 at 14:52:03.1 TD (14:51:09.1 UT1) 2445865.118856
Geocentric Coordinates of Sun and Moon
1984 Jun 13 at 14:26:38.3 TD (14:25:44.3 UT1)
Coordinate Sun Moon
Right Ascension05h28m22.3s17h27m24.8s
Declination+23°14'34.9"-24°41'08.0"
Semi-Diameter 15'44.8" 15'39.1"
Eq. Hor. Parallax 08.7" 0°57'26.4"
Geocentric Libration of Moon
Angle Value
l 4.8°
b 2.0°
c 1.8°
Earth's Shadows
Parameter Value
Penumbral Radius 1.2318°
Umbral Radius 0.7069°
Prediction Paramaters
Paramater Value
Ephemerides JPL DE406
ΔT 54.0 s
Shadow Rule Danjon
Shadow Enlargement 1.010
Saros Series 149 ( 1/71)

Explanation of Lunar Eclipse Data Tables

Eclipse Contacts: Penumbral Lunar Eclipse of 1984 Jun 13

Lunar Eclipse Contacts
Eclipse Event Contact Time
TD
Time
UT1
Zenith Latitude Zenith Longitude Position Angle Axis Distance
Penumbral BeginsP113:49:57.113:49:03.124°38.2'S152°09.6'E 200.9° 1.4930°
Greatest EclipseGreatest14:26:38.314:25:44.324°41.1'S143°20.1'E 188.6° 1.4589°
Penumbral EndsP415:02:59.515:02:05.524°44.0'S134°35.5'E 176.4° 1.4923°
Eclipse Durations
Eclipse Phase Duration
Penumbral (P4 - P1)01h13m02.4s

Explanation of Lunar Eclipse Contacts Table

Polynomial Besselian Elements: Penumbral Lunar Eclipse of 1984 Jun 13

Polynomial Besselian Elements
1984 Jun 13 at 14:00:00.0 TD (=t0)
n x y d f1 f2 f3
0 -0.44552 -1.40813 0.4057 1.23196 0.70706 0.26090
1 0.51372 -0.07765 0.0000 -0.00042 -0.00042 -0.00011
2 -0.00019 0.00026 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 = 14.000

Explanation of Besselian Elements

Links for the Penumbral Lunar Eclipse of 1984 Jun 13

Links to Additional Lunar Eclipse Information

Eclipse Predictions

Predictions for the Penumbral Lunar Eclipse of 1984 Jun 13 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 54.0 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.