Difference between revisions of "October 22, 2004"
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=H-Alpha Moon= | =H-Alpha Moon= | ||
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| − | + | <td width="50%"><h2><nobr>H-Alpha Moon</nobr></h2></td> | |
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| − | + | <tr><td colspan="2" valign="top"><div align="center"> | |
| − | + | <img src="archive/2004/10/images/LPOD-2004-10-22.jpeg" border="0"> | |
| − | + | </div></td> | |
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| − | + | <tr><td><div align="center" class="main_sm">Image Credit: [mailto:frankb@celestialwonders.com Frank Barrett]</p> | |
| − | + | </div></td> | |
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<br> | <br> | ||
<table class="story" border="0" bgcolor="#FFFFFF" width="90%" cellpadding="10" align="center"><tr><td> | <table class="story" border="0" bgcolor="#FFFFFF" width="90%" cellpadding="10" align="center"><tr><td> | ||
| − | + | <p align="center"><b>H-Alpha Moon</b></p> | |
| − | + | <p align="left">Most images of the Moon are taken in visible light, which is where human eyes are most sensitive. But here (right) is one taken through a hydrogen-alpha filter which is normally used to image the Sun in a narrow red part (656.3 nm) of the visible spectrum. I compare this image to Frank's previous [http://www.lpod.org/archive/2004/02/LPOD-2004-02-16.htm LPOD] (and [http://antwrp.gsfc.nasa.gov/apod/ap031212.html APOD]!) image on the left which was taken in visible light. I enhanced both images, making comparison a little uncertain. Nevertheless, there are a few interesting comparisons. first, the two images look quite similar - probably because the Sun is quite bright at H-alpha wavelengths, contributing significantly to its total visible brightness. Second, there are some differences. In H-alpha, Mare Nectaris is more muted - the rays that cross it are more strongly depicted. The same seems true for maria Fecunditatis and Crisium - both are low in titanium. Additionally, the dark mare patches south of Mare Serenitatis have more contrast on the H-alpha image. Frank's image suggests that amateurs may want to experiment imaging the Moon thru different color filters to explore compositional differences in the maria. </p> | |
| − | + | <blockquote><p align="right">— [mailto:tychocrater@yahoo.com Chuck Wood]</blockquote> | |
<p align="left"><p><b>Technical Details:</b><br> | <p align="left"><p><b>Technical Details:</b><br> | ||
Right image: Sept 25, 2004. Orion 80 mm ED + SBIG ST7E camera + Schuler 10nm H-alpha filter. Mosaic of two 110 ms exposures. CAW ehhanced with unsharp mask. Left image: Dec 9, 2003. Celestron C8 SCT with a SBIG ST-7E ccd camera and an Orion Moon Filter to capture 18 frames at 110 ms each which were mosaicked into this image.</p> | Right image: Sept 25, 2004. Orion 80 mm ED + SBIG ST7E camera + Schuler 10nm H-alpha filter. Mosaic of two 110 ms exposures. CAW ehhanced with unsharp mask. Left image: Dec 9, 2003. Celestron C8 SCT with a SBIG ST-7E ccd camera and an Orion Moon Filter to capture 18 frames at 110 ms each which were mosaicked into this image.</p> | ||
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[http://www.celestialwonders.com/Latest.html Frank's Celestial Wonders] | [http://www.celestialwonders.com/Latest.html Frank's Celestial Wonders] | ||
<p align="left"><b>Tomorrow's LPOD: </b> Imaging the First Lunar Photographer</p> | <p align="left"><b>Tomorrow's LPOD: </b> Imaging the First Lunar Photographer</p> | ||
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<table width="100%" border="0" cellspacing="2" cellpadding="4"> | <table width="100%" border="0" cellspacing="2" cellpadding="4"> | ||
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| − | + | <td><hr></td> | |
| − | + | </tr> | |
| − | + | <tr><td> | |
| − | + | <p align="center" class="main_titles"><b>Author & Editor:</b><br> | |
| − | + | [mailto:tychocrater@yahoo.com Charles A. Wood]</p> | |
| − | + | <p align="center" class="main_titles"><b>Technical Consultant:</b><br> | |
| − | + | [mailto:anthony@perseus.gr Anthony Ayiomamitis]</p> | |
| − | + | <p align="center" class="main_titles"><b>Contact Translator:</b><br> | |
| − | + | [mailto:pablolonnie@yahoo.com.mx" class="one Pablo Lonnie Pacheco Railey] (Es)<br> | |
| − | + | [mailto:chlegrand@free.fr" class="one Christian Legrand] (Fr)</p> | |
| − | + | <p align="center" class="main_titles"><b>[mailto:webuser@observingthesky.org Contact Webmaster]</b></p> | |
| − | + | <p align="center" class="main_titles"><b>A service of:</b><br> | |
| − | + | [http://www.observingthesky.org/" class="one ObservingTheSky.Org]</p> | |
| − | + | <p align="center" class="main_titles"><b>Visit these other PODs:</b> <br> | |
| − | + | [http://antwrp.gsfc.nasa.gov/apod/astropix.html" class="one Astronomy] | [http://www.msss.com/" class="one Mars] | [http://epod.usra.edu/" class="one Earth]</p> | |
| − | + | </td></tr> | |
</table> | </table> | ||
<p> </p> | <p> </p> | ||
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===COMMENTS?=== | ===COMMENTS?=== | ||
Click on this icon [[image:PostIcon.jpg]] at the upper right to post a comment. | Click on this icon [[image:PostIcon.jpg]] at the upper right to post a comment. | ||
Revision as of 17:26, 4 January 2015
H-Alpha Moon
<nobr>H-Alpha Moon</nobr> |
<img src="archive/2004/10/images/LPOD-2004-10-22.jpeg" border="0"> |
Image Credit: Frank Barrett
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H-Alpha Moon Most images of the Moon are taken in visible light, which is where human eyes are most sensitive. But here (right) is one taken through a hydrogen-alpha filter which is normally used to image the Sun in a narrow red part (656.3 nm) of the visible spectrum. I compare this image to Frank's previous LPOD (and APOD!) image on the left which was taken in visible light. I enhanced both images, making comparison a little uncertain. Nevertheless, there are a few interesting comparisons. first, the two images look quite similar - probably because the Sun is quite bright at H-alpha wavelengths, contributing significantly to its total visible brightness. Second, there are some differences. In H-alpha, Mare Nectaris is more muted - the rays that cross it are more strongly depicted. The same seems true for maria Fecunditatis and Crisium - both are low in titanium. Additionally, the dark mare patches south of Mare Serenitatis have more contrast on the H-alpha image. Frank's image suggests that amateurs may want to experiment imaging the Moon thru different color filters to explore compositional differences in the maria. Technical Details: Related Links: Tomorrow's LPOD: Imaging the First Lunar Photographer |
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Author & Editor: Technical Consultant: Contact Translator: A service of: Visit these other PODs: |
COMMENTS?
Click on this icon File:PostIcon.jpg at the upper right to post a comment.
