Verna and Bob's Weblog

Nerdliness

Solar Astrophotography

In anticipation of the Annular Solar Eclipse on October 14, 2023, I got out the Canon SL1 camera and associated accessories to photograph the solar disk. I used the Canon EF 100-400mm along with a Thousand Oaks Optical threaded SolarLite® filter to get the (clickable) image above. I had to experiment with the camera settings to get the image and further had to adjust it using a photo processing app.

The setup resolved the solar disk and a couple or three sunspots currently visible; the two larger sunspot visible are 3297 and below that 3294. Those numbers are according to SpaceWeather.com.

As I mentioned above, I had to experiment with the camera settings a bit. Using the camera’s Programmed (P) setting, the images were overexposed. I switched to the shutter speed priority setting and tried several exposure times from 1/1000 second, 1/2000 second, and 1/4000 second. The latter, which is the fastest shutter speed on the camera, captured enough of the details needed to produce the image seen above and will certainly be good enough for the annular eclipse. For the total eclipse in April of 2024, it will be necessary to remove the attenuating filter during totality in order to capture the details of the solar limb and the spectacular appearance of the solar corona.

May 6, 2023 by Astronomy Nerdliness Photography Something Shiny

Ephemeris Back On-Line

Old Sidebar Widget from February 11, 2021

Remember the Solar Ephemeris sidebar widget from our old blog theme? It gave daily information about the sun cycle — that is, sunrise, sunset and so forth. Well, I have it back on-line in the form of a sidebar link to a dedicated page that has the old widget code embedded in it.

I had some problems with making it work with the new versions of the server-side software that we use. There were some minor, but show-stopping changes to the platform that killed the Ephemeris code that ran on the old theme. I spent a couple of hours debugging the code today and now have the prototype running again in the “Bob’s Solar Ephemeris” page. Click on the link or select the page from the sidebar. Disclaimer: it’s still a work in progress and is subject to formatting changes.

One of these days, I might start on an interactive widget where users can put in their own geographical coordinates to see the sun’s daily times for their location.

January 5, 2023 by Blogosphere Nerdliness

Lunar Occultation of Mars

Verna and I witnessed the occultation of Planet Mars by Earth’s Moon this evening. At about 7:32 PM Arizona Time, Mars could be seen to disappear behind the Moon and would emerge again about an hour later on the opposite side of the Moon. In the image above (courtesy Griffith Observatory) you can see the tiny Martian dot just below and to the left of the Lunar limb. This is just about the same as we saw it around 7:30PM tonight. We came back outside at 8:30PM and witnessed the re-appearance of the Martian dot on the upper right Lunar limb – very impressive (and nerdy). We both enjoyed it and commented that it was a fun thing to do. We also had witnessed a visible flyover of the International Space Station about fifteen minutes prior to the beginning of the occultation.

From In The Sky — About this occultation:

The Moon will pass in front of Mars, creating a lunar occultation visible from parts of the Americas, Europe and Northern Africa.

Lunar occultations are only ever visible from a small fraction of the Earth’s surface. Since the Moon is much closer to the Earth than other celestial objects, its exact position in the sky differs depending on your exact location on Earth due to its large parallax. The position of the Moon as seen from two points on opposite sides of the Earth varies by up to two degrees, or four times the diameter of the full moon.

This means that if the Moon is aligned to pass in front of a particular object for an observer on one side of the Earth, it will appear up to two degrees away from that object on the other side of the Earth.

At the time of the occultation, the Moon will be 15 days past new moon and will be 100% illuminated.

December 7, 2022 by Astronomy Nerdliness Something Shiny

Radio Check Day

I try and do a check on the functionality and battery condition monthly for each of these little portable hand-held radios. Each is checked against either another radio or via a local radio “repeater.” Three of these are for amateur “ham” radio frequencies while the last pair are GMRS/FRS two-way citizens radios.

I have been a ham radio “nerd” since 1958, and the little radios for the ham bands are for emergencies or maybe a little “rag chew” with other hams from time to time. The FRS radios are for our use when we’re on the road camping and get out of sight of each other. They are also handy for backing the RV up with her outside guiding me inside doing the driving.

The image above (L to R) shows the three ham radios, the charger, a spare battery and the FRS pair hooked to their charger. Click on the image to enlarge.

February 1, 2022 by Nerdliness

More Mars Helicopter in 3D

Mars Helicopter Ingenuity in 3D

Another 3D photo from Mars: Ingenuity as seen from the Perseverance Rover on about June 21, 2021, Earth time. Click on the image to enlarge.

From NASA Mars Helicopter Pages:

NASA’s Ingenuity Mars Helicopter is seen here in 3D using images taken June 6, 2021, by the left and right Mastcam-Z cameras aboard NASA’s Perseverance Mars rover. Credit: NASA/JPL-Caltech/ASU/MSSS

As of June 21, 2021, Ingenuity Mars Helicopter has successfully flown its 8th flight, traveling about 525 feet (160 meters) south-southeast from Airfield D to the new Airfield E! This marks the third flight in the Operations Demonstration Phase of Ingenuity, in which the team will continue to push the flight envelope of the aircraft while learning valuable operational lessons. Flight 8 was also the first flight the vehicle executed since performing an update of its Flight-Controller flight software and all telemetry indicates that the update was a success!

In the event that you do not have your 3D anaglyph red/cyan glasses handy, you can see the 2D photo here.

June 27, 2021 by Aerospace Bob's 3D Stuff Nerdliness

Avalon 1998

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