home observation science solar system stars our galaxy cosmology astrobiology exoplanets astrophotography

It's the Astronomy Online non-Blog, or un-Blog.

Everyone has a blog now and since I am no follower of trends, I decided to merge the blog with the website. And I don't want to neglect the website in favor of posting on the blog.

These are the pages that were on the blog of old:

- Home

- Archive (Index of Pages)

- Me

- Current Trends

- Links

- Soho Live


Google Maps - Mars
Google Maps - Moon
HiRISE - MRO Imaging
Mac Singularity
Slackerpedia Galactica
Software for the Mac
Starry Night Online
Venus Maps

More Favorites:



Get Firefox!

Thank you for visiting!


Mercury Transit Image Update:

As promised, I have on display a "processed" frame of the Mercury Transit of November 8, 2006.

Mercury Transit

This image is a combination of several frames using PhotoShop CS2. Layers were combined using the overlay and luminosity blending modes while enhancements were done with smart sharpening and curves.

The image source is from a Coronado P.S.T. and a Meade LPI. Image capture was performed using K3CCDTools.

Planetary transits are rare events and only happen with the inner planets Mercury and Venus - only they come between us and the Sun (our Moon included, but that transit is called an eclipse). These are rare because the orbital inclination vary between the planets - they do not orbit on exactly the same plane but are offset by a few degrees. Transits offer opportunity for a variety of study like atmosphere composition using spectroscopy and measuring brightness changes of the Sun as the planet crossed the disk. While these brightness changes are very small, they do provide a baseline for exoplanet transit measurements.

Dates of future transits can be found on the Calendar Notes section of Astronomy Online.


Next Post | Previous Post | Back to Top

Search | Site Map | Appendix
©2004 - 2023 Astronomy Online. All rights reserved. Contact Us. Legal. Creative Commons License
The works within is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.