Night Sky Calendar - Northern Hemisphere
November 2009
Celestial Object

02 - Full Moon at 19:14 UT
05 - Taurid (south) meteor shower peaks. Active between 25 Sept and 25 Nov.
000 Associated with Comet 2P/Encke.
09 - Moon near Mars (morning sky) at 14h UT. Mag. +0.3.
12 - Taurid (north) meteor shower peaks. May produce the occasional bright fireball.
17 - Leonid meteor shower peaks at 9h UT. Arises from debris ejected by
000 Comet Tempel-Tuttle in 1533. Expect about 25 to 30 meteors per hour under
000 dark skies. Predictions of enhanced activity between 21-22h UT on 17 Nov
000 (favours sky watchers in Asia).
21 - Alpha Monocerotid meteor shower peaks at 15:25 UT. A usually minor
000 shower active 15-25 Nov. Radiant is near Procyon. Predictions of enhanced
000 activity this year. Timing favours Far East Asia, Australia and across the
000 Pacific to Alaska.
00 0 0 0 0 0// Get the complete calendar version at skymaps.com
7 -

The photo was taken by the Hubble Space Telescope and shows a detail of the nebula. This close-up shows a dense cloud of dust and gas, a stellar nursery full of embryonic stars. This cloud is about 8 light-years away from the nebula's central star, not shown in this picture. Located in Sagitarius, the nebula's name means "divided into three lobes".


Thursday, January 04, 2007

 Titan Has Liquid Lakes, Scientists Report in Nature 

Scientists report definitive evidence of the presence of lakes filled with liquid methane on Saturn’s moon Titan in this week’s journal Nature cover story. Radar imaging data from a July 22, 2006, flyby provide convincing evidence for large bodies of liquid on Titan today. A new false-color radar view gives a taste of what Cassini saw.

Lake Characteristics:

-Radar-dark patches are interpreted as lakes based on their very low radar reflectivity and morphological similarities to lakes, including associated channels and location in topographic depressions.
-Radar-dark surfaces are smooth and most likely liquid, rock, ice or organics. More than 75 radar-dark patches or lakes were seen, ranging from 3 kilometers (1.8 miles) to more than 70 kilometers (43 miles) across.
-Some lakes appear partly dry, while others seem liquid-filled. Some of the partly filled lakes may never have filled fully, or may have partly evaporated at some point in the past. The dry lakes have margins or rims and a radar brightness similar to the rest of the surrounding terrain, making them appear devoid of liquid.
-The varying states of how full the lakes are suggest that lakes in this region of Titan might be temporary on some unknown timescale.
-Approximately 15 of the dark patches seem filled and show no clear evidence of erosion. These dark patches resemble terrestrial lakes confined within impact basins (for example, Clearwater Lakes in Canada) or within volcanic calderas (for example, Crater Lake, Oregon). The nest-like nature of these lakes and their limited range of sizes make it unlikely that they originated from an impact. A volcanic origin for the depressions is possible, given their appearance.
-Some lakes have steep margins and very distinct edges, suggesting a topographic rim. These lakes are consistent with seepage or groundwater drainage lakes.
-Other lakes have diffuse, more scalloped edges, with a gradual decrease in radar brightness towards the center of the lake. These lakes are more likely to be associated with channels, and may be either drainage lakes or groundwater drainage lakes.
-Yet other lakes have curvy channel-like extensions, similar in appearance to terrestrial flooded river valleys (for example Lake Powell).
-Bright patches near the lake edges could be small islands peeking through the surface. Floating “icebergs” are unlikely because most materials would not float in liquid hydrocarbons.

Source: JPL Newsletter

Posted @ 4:17 PM by kinzi



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    ryan kinzi
    Nightsky calendar (a brief version) by Skymaps & NASA's Space Calendar | Image of FCO - credit: NASA. Design & page layout © kinzi - 2009 | Contact me? xeno@(no-spam)cougars.com


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