Author: David Mathre

I am a scientist by training (Eckerd College, BSc; Caltech, Ph.D.). I worked for 27 years as a Chemist in the Pharmaceutical Industry developing processes to manufacture medicines for human and animal health. I now spend my time as a photographer and world traveler. My interests include the natural world, wildlife, landscapes, sky, and seascapes, travel, and astrophotography. I look for unique ways of viewing the world and presenting my images. I have traveled to over 55 countries in six continents, often on Semester at Sea voyages. While at home in New Jersey, I spend time on home renovation and expansion of a wildflower garden/meadow.

Tuesday (22-October-2024) — New Jersey

Comet C/2023 A3 (Tsuchinshan–ATLAS)

It was another clear night and two tripods and two telescopes were moved to the back section to view the comet. Each night Comet C/2023 A3 (Tsuchinshan–ATLAS) is a little bit higher in the sky but becomes a bit dimmer. The estimated magnitude of the comet was +4.9. The length of the comet tail also decreases every night. The digital sensor field of view for the first image (Vespera Passengers ) with the comet head near the center is 2.4° x 1.8°. For the second image (Vespera II) I was able to get the comet head closer to the bottom. The diagonal field of view for this sensor is 2.5° x 1.4°.

Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 30 images taken with a Vaonis Vespera-Passengers Telescope (200 mm, f/4, 30 x 10 sec).
Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 30 images taken with a Vaonis Vespera-Passengers Telescope (200 mm, f/4, 30 x 10 sec).

Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 30 images taken with a Vaonis Vespera II Telescope (250 mm, f/5, 30 x 10 sec) using a CLS (city light suppression) filter.
Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 30 images taken with a Vaonis Vespera II Telescope (250 mm, f/5, 30 x 10 sec) using a CLS (city light suppression) filter.

Monday (21-October-2024) — New Jersey

Comet C/2023 A3 (Tsuchinshan–ATLAS)

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).

Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 30 images taken with a Vaonis Vespera-Pro Telescope (250 mm, f/5, 30 x 10 sec).
Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 30 images taken with a Vaonis Vespera-Pro Telescope (250 mm, f/5, 30 x 10 sec).

Sunday (20-October-2024) — New Jersey

Comet C/2023 A3 (Tsuchinshan–ATLAS)

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).

Comet C/2023 A3 (Tsuchinshan–ATLAS). Image taken with a Hasselblad 907c camera and 25 mm f/2.5 lens (ISO 800, f/8, 32 sec).
Comet C/2023 A3 (Tsuchinshan–ATLAS). Image taken with a Hasselblad 907x camera and 25 mm f/2.5 lens (ISO 800, f/8, 32 sec). Processed jpg image with Capture One and Topaz AI (denoise). Cropped to 8k x 8k (~60° field of view).
Autumn in New Jersey. Image taken with a Hasselblad 907c camera and 25 mm f/2.5 lens
Comet C/2023 A3 (Tsuchinshan–ATLAS). Image taken with a Hasselblad 907x camera and 25 mm f/2.5 lens (ISO 800, f/8, 32 sec). Processed jpg image with Capture One and Topaz AI (denoise). Cropped to 2400 x 2400 pixels (~ 18° field of view).

Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 30 images taken with a Vaonis Vespera Classic Telescope (200 mm, f/4, 30 x 10 sec).
Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 30 images taken with a Vaonis Vespera Classic Telescope (200 mm, f/4, 30 x 10 sec).

Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 30 images taken with a Vaonis Vespera-Pro Telescope (250 mm, f/5, 30 x 10 sec).
Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 30 images taken with a Vaonis Vespera-Pro Telescope (250 mm, f/5, 30 x 10 sec).

Friday (11-October-2024) — New Jersey

Northern Lights Display Visible in New Jersey

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.

View Looking North

Camera 1: Northeast (82° Field of View). 19:19-20:21

View Looking East

Camera 2: East (92° Field of View). 19:30-03:00

 

View Looking Up

Camera 3: Up (180° Field of View). 19:48-22:36

View Looking NorthWest

Camera 4: Northwest (104° Field of View). 20:00-01:36

View Looking North

Camera 1: Northeast (75° Field of View). 20:24-03:00

View Looking North

Camera 5: North (114° Field of View). 22:05-04:49

View Looking NorthEast

Camera 6: Northeast (84° Field of View). 22:17-01:09

Individual Images

Star Trails and Northern Lights Over New Jersey. Composite of 304 images taken with a Nikon Z9 camera and 8-15 mm fisheye lens (ISO 1600, 8 mm, f/8, 30 sec).

Thursday (27-June-2024) — New Jersey

Independence Day Fireworks

Montgomery Township typically celebrates Independence Day with fireworks several days before the 4th of July. There was some grumbling that the fireworks overlapped the debate. The fireworks were scheduled a long time before the debate. I live near a great location that overlooks the high school where the township holds the Independence Day celebration. It is away from the crowds. I got there just before sunset. One car arrived before me but there was still plenty of space to set up the tripods and cameras. Last year, one camera wasn’t in focus so I spent more time get all of the cameras set up, framed and focused. Confirmed that they all memory cards and full batteries. Also, since the cameras were all on tripods, I made sure that the “vibration reduction/stabilization” was turned off. As it got dark a few fireflies were visible. I set the cameras up as follows: Base ISO (50, 64, or 160), f/11, 8 second exposure. The fireworks started just before 21:25. It took a little bit of time to confirm the framing, focus, and to start the interval timers.

Individual images in the slideshow are available in my PhotoShelter Gallery.

Individual images in the slideshow are available in my PhotoShelter Gallery.

Individual images in the slideshow are available in my PhotoShelter Gallery.

Individual images in the slideshow are available in my PhotoShelter Gallery.

Individual images in the slideshow are available in my PhotoShelter Gallery.

Solar Energy Monitor

I use a Sense Home Energy Monitor to record my daily electric energy used (78.7 kWh) and daily solar electric energy produced (71.1 kWh). Mostly sunny and hot with a Water Furnace geothermal system cooling the house. Deficit of 7.6 kWh for the day.

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