One of these images is of the Moon on 2 Feb 2017. The other image is of Venus on 3 Feb. Can you tell which is which? What is your reasoning?
I headed home after attending the public lecture on aurorae by University of Iowa professor Craig Kletzing. One part of his talk included a demo of color emissions from the element oxygen. It is responsible for nearly all the colors associated with aurorae. We needed diffraction grating glasses to see the demo effect such as these.
As I drove home, I noticed the bright crescent Moon. I stopped the car to look through my grating glasses. Once home I set up the camera with the grating over the lens. It was a nice way to end the day.
🔭 Updates an earlier post to include recent changes and information.
As an amateur astronomer, I use desktop planetarium software to plan viewing sessions and keep track of the planets and Moon. There are many products available for all computer platforms and smartphones. A Google search yields links to many sources. I downloaded and use the open source Stellarium on my desktop computer. It can be customized to your location and is free. For Android and Mac phones and tablets, I like SkySafari. It isn’t free.
Online planetarium sites are popular and offer many features. Below are highlights of some I find interesting. Each has multiple features, a unique look and feel, and different levels of detail. They can help satisfy your curiosity about astronomical events.
I limited this post to include only a few select sites and links. Since many are available, it’s easy to be overwhelmed with too much information. I hope these few of top quality will motivate you to investigate the sky and enjoy what it has to offer. I welcome reader questions or reviews about using these tools or others you find helpful.
How will the Moon look today, on your birthday, or any date in 2017? Find out at NASA Dial-a-Moon. Enter any month, day, and universal time (UT) hour to see a high definition image. The composite images of Dial-a-Moon are made from those of the Lunar Reconnaissance Orbiter (LRO) in low altitude orbit around the Moon since 2009. Here is the link for southern hemisphere readers.
You may leave the universal time (UT) at the default 1 value. If you are a curious type, Universal time conversion can be done at this link. Enter UTC in the lower right box if it isn’t already set. You can switch from 12 hr to 24 hr at the bottom of the entry boxes. You may also enter any other local time in the upper left box. Go back to Dial-a-Moon to enter the UT.
The collection of accurate images of the Moon for each hour have been made into a movie lasting 5 minutes. Try watching full screen and increase the speed by 2x. Speed can be changed using the gear icon ⚙ after the movie starts. Two versions of the movie are available for readers in northern and southern hemisphere.
I explain the peculiar wobble and tipping motions at this blog post.
There were many news stories about the appearance of New Year’s Eve Comet 45P/Honda-Mrkos-Pajdušáková in the evening sky near the western horizon. After dinner, I walked my camera and tripod a block away and set up to try imaging the comet. It was to appear somewhere in the field to the left of the thin crescent Moon in this simulated view.
I tried several images changing the zoom, ISO, field of view, and shutter speed. I got no evidence of the comet. It was too dim to detect even after several enhancements using Photoshop. If it is clear again tonight, I might try viewing with my telescope instead.
I did salvage one very nice image of the thin crescent new Moon. I’m always glad to see it.
I offer this peaceful view of the morning sky. The crescent Moon at lower left aligned with Jupiter and the star Spica in a slender triangle at 6:25 am. Jupiter is at the upper right. Spica is almost directly below Jupiter and equidistant from the Moon. Spica is difficult to see because of the twilight. Click for a larger view.
The waning Moon always offers a nice view first thing in the morning from my front window.
Much has been written about this morning’s Supermoon. If you missed it, there is another December 13. The moon doesn’t orbit the earth in a perfect circle. It is a bit eccentric making it closer and farther from earth than average by a few % during each orbit. Today, just before sunrise, it was at its closest at nearly the same time as when it was full. Both events combined to make this the largest full moon since 1948 by a slight amount. I went out before 6 am to document it. A parking lot nearby gave an unobstructed view to the west where the moon was close to the horizon. It was also aligned with a radio tower to provide an interesting reference frame.
There were a few high thin clouds passing by to make photographing a bit more of a challenge. The parking lot allowed me to move around and compose different views like this one.