What's New

Choosing A Telescope

Telescope Aperture Considerations

Astronomical Sketches

Introduction to Planetary Sketching

Visual Observations

Refractor Dobsonian Style Mounts

Equipment Reviews

Favorite Quotes

The Bonds: Pioneers of American Astronomy

Saturn's Encke Minima and Encke Division

Nature and Travel Photography

Astrophotography

Astronomy Humor

Glossary

Recommended Astronomy Books

Links

Home

March 19th, 2012, 23:20 - 23:40 UT, seeing fair - poor, transparency 5.

TMB 130mm (5.1") f/9.25 refractor on alt-az mount. Magnification 204x. Filters used: Baader deep blue (W38A) and red (W25).

South is at the top of this sketch, following is on the right hand side, north is at the bottom of the sketch, and preceding is on the left hand side.

Much of Venus had a dusky appearance to it that extended from the terminator towards the following edge. This detail was brought out by the Baader deep-blue filter (W38A). When I have observed Venus before without the deep-blue filter the dusky appearance was only noticeable near the terminator.

The Baader red filter (W25) brought out the cusp extensions in the north and south polar regions. The cusps were not visible without the red filter.