Total Lunar Eclipse of 2011 Dec 10

Fred Espenak

Introduction


The Total Lunar Eclipse of 2011 Dec 10 is visible from the following geographic regions:

  • Europe, eastern Africa, Asia, Australia, Pacific, North America

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 2011 Dec 10 at 14:32:57 TD (14:31:50 UT1). This is 4.6 days after the Moon reaches apogee. During the eclipse, the Moon is in the constellation Taurus. The synodic month in which the eclipse takes place has a Brown Lunation Number of 1100.

The eclipse belongs to Saros 135 and is number 23 of 71 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 total lunar eclipse of 2011 Dec 10 is preceded two weeks earlier by a partial solar eclipse on 2011 Nov 25.

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 66.7 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 Total Lunar Eclipse of 2011 Dec 10 .


Eclipse Data: Total Lunar Eclipse of 2011 Dec 10

Eclipse Characteristics
Parameter Value
Penumbral Magnitude 2.18600
Umbral Magnitude 1.10612
Gamma-0.38819
Epsilon 0.3571°
Opposition Times
Event Calendar Date & Time Julian Date
Greatest Eclipse 2011 Dec 10 at 14:32:56.5 TD (14:31:49.9 UT1) 2455906.105438
Ecliptic Opposition 2011 Dec 10 at 14:37:29.6 TD (14:36:22.9 UT1) 2455906.108599
Equatorial Opposition 2011 Dec 10 at 14:33:28.4 TD (14:32:21.7 UT1) 2455906.105807
Geocentric Coordinates of Sun and Moon
2011 Dec 10 at 14:32:56.5 TD (14:31:49.9 UT1)
Coordinate Sun Moon
Right Ascension17h08m35.0s05h08m33.9s
Declination-22°54'38.7"+22°33'13.3"
Semi-Diameter 16'14.5" 15'02.4"
Eq. Hor. Parallax 08.9" 0°55'11.7"
Geocentric Libration of Moon
Angle Value
l -3.9°
b 0.5°
c -6.6°
Earth's Shadows
Parameter Value
Penumbral Radius 1.2023°
Umbral Radius 0.6609°
Prediction Paramaters
Paramater Value
Ephemerides JPL DE406
ΔT 66.7 s
Shadow Rule Danjon
Shadow Enlargement 1.010
Saros Series 135 (23/71)

Explanation of Lunar Eclipse Data Tables

Eclipse Contacts: Total Lunar Eclipse of 2011 Dec 10

Lunar Eclipse Contacts
Eclipse Event Contact Time
TD
Time
UT1
Zenith Latitude Zenith Longitude Position Angle Axis Distance
Penumbral BeginsP111:34:40.211:33:33.622°33.0'N176°45.5'W 256.4° 1.4519°
Partial BeginsU112:46:49.812:45:43.122°33.2'N165°49.4'E 247.6° 0.9109°
Total BeginsU214:07:23.714:06:17.022°33.3'N146°22.6'E 210.1° 0.4102°
Greatest EclipseGreatest14:32:56.514:31:49.922°33.2'N140°12.6'E 180.7° 0.3571°
Total EndsU314:58:31.614:57:25.022°33.2'N134°02.1'E 151.2° 0.4104°
Partial EndsU416:19:06.316:17:59.622°32.8'N114°35.2'E 113.7° 0.9122°
Penumbral EndsP417:31:08.517:30:01.822°32.4'N097°12.0'E 104.9° 1.4540°
Eclipse Durations
Eclipse Phase Duration
Penumbral (P4 - P1)05h56m28.3s
Partial (U4 - U1)03h32m16.5s
Total (U3 - U2)00h51m07.9s

Explanation of Lunar Eclipse Contacts Table

Polynomial Besselian Elements: Total Lunar Eclipse of 2011 Dec 10

Polynomial Besselian Elements
2011 Dec 10 at 15:00:00.0 TD (=t0)
n x y d f1 f2 f3
0 0.20961 -0.35958 -0.3999 1.20242 0.66105 0.25069
1 0.47417 -0.00569 -0.0001 0.00029 0.00029 0.00008
2 0.00015 -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 = 15.000

Explanation of Besselian Elements

Links for the Total Lunar Eclipse of 2011 Dec 10

Links to Additional Lunar Eclipse Information

Eclipse Predictions

Predictions for the Total Lunar Eclipse of 2011 Dec 10 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 66.7 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.