Archive for September 2023

The First Day Of Fall, But What Does It Mean? On September 23rd, 2023 The Sun Begins Its Annual Trek Back Toward The Southern Hemisphere. This Changes The Angle Of The Sun, Cooling The Northern Hemisphere, Leaving Summer, Bringing Cooler Weather And Then Winter.

September 23, 2023

The following solar project was suggested by Tom English:

Then on the two equinoxes (the first day of spring, and the first day of fall) the sun will cast no shadow, as the sun will be shining directly down the steel rod.

Note: Tom was formerly an astronomy and physics professor at Gardner-Webb University for many years, but now teaches in Greensboro. However, we still stay in touch.

During more than a decade, we spent many nights in my backyard with telescopes, enjoying observing galaxies, nebulae and star clusters. Tom would often bring an 8-inch Celestron Orange-Tube SC telescope, and we’d compare views with my 10-inch Newtonian.

The Celestron Story: https://rogerivester.com/2022/09/26/the-8-inch-orange-tube-schmidt-cassegrain-f-10-telescope-founder-tom-johnson-and-other/ 

My latitude in North Carolina: The Latitude is 35º 15 mins

So a simple calculation to determine the angle of the rod.

(90º – 35º) = 55º

Debbie using an angle finder to determine 55º.

The angle of the rod is toward the South at 55º. So draw a line, with the post, going South to North.

Note the shadow: It will be increasing, each day, and getting shorter, until September 23rd, when there will be no shadow, as the sun will be “pointing directly down” the rod.

The following photo:

The yellow mark indicated the sun shadow on August 24th, and the position of the sun shadows on different days following.

The red mark was made on October 4th.

Note: The crossbar on the rod is for pushing in the ground with my foot, and nothing more.

NGC 6891 Planetary Nebula In Delphinus: September 2023 Observer’s Challenge # 176

September 17, 2023

This was taken with my 32-inch telescope with NB filters (Ha, O3, and S2). Central star prominent, nice detail in the outer nebula. 

This is a very bright small planetary in Delphinus, so my exposures were very short at 40 seconds for the Ha and O-III. Total imaging about 1.5 hours.

ZWO ASI 6200 camera, processed in pixInsight.

NGC 6891 

Planetary Nebula In Delphinus 

Date: August 17th 2023

Telescope: 10-Inch f/4.5 EQ Newtonian 

Sketch Magnification: 256x

Field of View: 0.25º

Location: 4.8-5.0 NELM Suburban Backyard 

August 17th 2023: Small, well-defined bluish disc, with a faint central star.  

August 16th: 6-inch f/6 Newtonian at 127x. Very small, appearing mostly as a star, but with a faint halo, and fairly difficult to determine from the star-field.

Visual Observing And “Keeping The Ancient Art Of Pencil Sketching Alive.” The Following Sketches Are A Sampling Of What’s Possible With Nothing More Than A Pencil And Pad

September 3, 2023

Cocoon Nebula in Cygnus: Very faint and difficult, but with patience and a “reasonably” dark-sky it’s possible. Look for the tiny star chain, just to the NE and you know, you’re close to the Cocoon.

Comet Hale-Bopp With All Three Tails Being Sketched: The Gas Tail, The Dust Tail and The Anti-Tail. Chalk sketch on black card stock. (March 1997)

10-inch EQ f/4.5 Newtonian Telescope: Nine Galaxies in a 1/2º Field-of-View, around M84 and M86