Friday, February 6, 2009

PENUMBRAL LUNAR ECLIPSE 9 FEBRUARY 2009

(Source : http://www.angkasa.gov.my/)


In the evening of 9 February 2009, we will be able to observe penumbral lunar eclipse from 8:39 p.m. to 00:38 a.m. In general, lunar eclipse occurs when Moon passes Earth’s shadow during full Moon.

The eclipse will begin at 8:39 p.m. when the Moon starts passing the penumbral shadow of the Earth (P1). The maximum phase occurs at 10:38 p.m. And the Moon will totally leave penumbral shadow (P4) at 00:38 a.m. in the following day.

Meanwhile for those who are not be to attend the observation program, please watch the LIVE WEBCAST on Penumbral Lunar Eclipse 8:30 p.m. to 12:00a.m. on 9 February 2009.


PENUMBRAL LUNAR ECLIPSE


In general, lunar eclipse occurs when Moon passes Earth’s shadow during full Moon as shown in Diagram 1. On the 9 February, eclipse will be easily visible to the naked eye as 89.9% of the Moon’s disk is immersed in the penumbra.

The eclipse will begin at 8:39 p.m. when the Moon starts passing the penumbral shadow of the Earth (P1). The maximum phase occurs at 10:38 p.m. And the Moon will totally leave penumbral shadow (P4) at 00:38 a.m. in the following day.
However, most observers will not be able to visually detect the eclipse at the beginning and the ending of the eclipse until about 2/3 of the Moon’s disk is immersed in the penumbral shadow. This would put the period of eclipse visibility from approximately 10:00 p.m. to 11:20 p.m.

Residents in Alaska, Hawaii, Australia and East Asia will have the opportunity to observe Penumbral Lunar Eclipse. Residents in Western Canada and the Northern USA have the best views with moonset occurring sometime after maximum eclipse.

Phases of Penumbral Lunar Eclipse are shown in Diagram 2 with the explanation in Table 1.

Table 1 : Data on the Penumbral Lunar Eclipse on 9 February 2009

Phase............Remarks..................................Time

P1..............Moon start passing “Penumbra”...........08:39 p.m.

Maksimum....Moon partially blocked by “Penumbra”....10:38 p.m.

P4................Moon start leaving “Penumbra”...........12:38 a.m.


Note: Umbra – The darkest part of a shadow
Penumbra - The region in which only a portion of the occulting body is obscuring the light source





Diagram 1: Geometry of Lunar Eclipse




Diagram 2: Phases of Penumbral Lunar Eclipse 9 Feb. 2009


In conjuction with Penumbral Lunar Eclipse, National Space Agency (ANGKASA) will organize a Penumbral Lunar Eclipse Observation Program at the National Planetarium Kuala Lumpur on 9 February 2009 from 8:30 p.m. to 12:00 a.m.

Meanwhile for those who are not be to attend the observation program, please watch the live web cast Penumbral Lunar Eclipse 8:30 p.m. to 12:00a.m. on 9 February 2009 at http://www.angkasa.gov.my


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