David's Images of the Day Photoblog
I returned to the far corner of my backyard with a view to the west where Comet C/2023 A3 (Tsuchinshan–ATLAS) was still high enough above the trees be visible just after dusk. The estimated magnitude of the comet was +4.7. I couldn’t see it directly, but easily captured an image with Vespera Pro telescope. This is a composite of 30 stacked 10 second images (300 second exposure).
I found a spot in the far corner of my backyard with a view to the west where Comet C/2023 A3 (Tsuchinshan–ATLAS) was still high enough above the trees after dusk to be visible. The estimated magnitude of the comet was +4.5. To me barely visible to the eye, but easily captured by camera or Vespera telescope.
To observe a comet with the Vespera telescopes, you first need to determine the RA (right ascension) and Dec (declination) coordinates of the comet for your location at the time of the observation. I use Stellarium find this information. The RA/dec data is needed to create a manual observation target in the Singularity application that controls the Vespera telescopes.
The Vespera telescopes weigh about 5 kg (11 lbs) and could easily be carried to the far corner of my backyard and set up on heavy duty camera tripods. The only thing I needed to worry about was a doe that found a hole in my deer fence and was wandering around in the back yard. Once it was dark enough to initialize (automatically align and focus) the Vespera telescopes all I needed to do set it to look for the manual target and start acquiring and stacking images.
The comet was much brighter than the other stars in the field of view. The comet’s tail was longer than the field of view of the telescopes. Vespera Classic (1.6° x 0.9°) and Vespera Pro (1.6° x 1.6°). The jpg images were processed to increase the brightness (Capture One Pro) and reduce the noise (Topaz AI).
On Wednesday, Sunspot AR3848 sent a powerful solar flare directly toward earth. Based on the intensity and length of the coronal mass ejections (CME), NOAA and NASA forecasted that it could cause a severe G-4 class geomagnetic storm, with the possibility of auroras being visible further south than usual. The CME arrived on Thursday generating multiple alerts.
I went outside a little after 7 PM to possibly set up a camera to capture the Northern Lights. I don’t have a good view of the horizon to the north and hoped to see something above the trees. I wasn’t expecting anything this early as it was just dark out. To my amazement the sky looking north was bright red, and when I looked to the east and then south saw the typical aurora green. The display was everywhere, even straight up. It was much brighter than I expected, easily visible to the eye, not just with a digital camera. I wasn’t sure which direction to point the camera. I ended up setting up several cameras with wide angle lenses pointing different directions, including one with a fisheye lens with a 180° view pointing straight up. Each camera was set to take images every 30 seconds (30 second exposure, f/8, ISO 1600). Even though I missed some of the initial brightest display, I left the cameras out for several more hours. They did come back several times. I used the images to create the following time lapse videos.
