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.

Sunday (08-December-2024) — New Jersey

Six-Years Ago Today. Pillar of Light at Sunrise. Composite of 6 images taken with a Leica CL camera. (08-Dec-2018, New Jersey).

Comet C/2023 A3 (Tsuchinshan–ATLAS)

The comet is getting fainter and the tail much shorter. The magnitude is now 10.1. The first image is a composite of 31 images (5 min 10 sec) and the second one is a composite of 254 images (42 min 20 sec). In the second image there is some movement of the comet head. Also, the comet is moving into a region of the sky with part of the milky way in the background (many more faint stars).

Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 31 10 sec images taken with a Vaonis Vespera-Pro Telescope (250 mm, f/5, 310 sec).
Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 31 10 sec images taken with a Vaonis Vespera-Pro Telescope (250 mm, f/5, 310 sec).

Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 254 10 sec images taken with a Vaonis Vespera-Pro Telescope (250 mm, f/5, 2540 sec).
Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 254 10 sec images taken with a Vaonis Vespera-Pro Telescope (250 mm, f/5, 2540 sec).

Friday (06-December-2024) — New Jersey

Nine-Years Ago Today. Frost covered Common Barberry. Hobler Park, New Jersey. (06-Dec-2015).

Jet Silhouettes Transiting the Sun.

In addition to the sunspots (we are at or near the solar maximum) I captured two jets transiting the sun using a Vespera Pro telescope fitted with a solar filter.

Sun with sunspots and the silhouette of a jet. Image taken with a Vaonis Vespera Pro Telescope (250 mm, f/5, 1/4000 sec) with a solar filter.
Sun with sunspots and the silhouette of a jet. Image taken with a Vaonis Vespera Pro Telescope (250 mm, f/5, 1/4000 sec) with a solar filter.

Sun with sunspots and the silhouette of a jet. Image taken with a Vaonis Vespera Pro Telescope (250 mm, f/5, 1/4000 sec) with a solar filter.
Sun with sunspots and the silhouette of a jet. Image taken with a Vaonis Vespera Pro Telescope (250 mm, f/5, 1/4000 sec) with a solar filter.

Comet C/2023 A3 (Tsuchinshan–ATLAS)

The comet is getting fainter and the tail shorter. The magnitude is now 10.0. The first image is a composite of 31 images (5 min 10 sec) and the second one is a composite of 90 images (15 min). In the second image there is some movement of the comet head. Also, the comet is moving into a region of the sky with part of the milky way in the background (many more faint stars).

Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 31 10 sec images taken with a Vaonis Vespera-Pro Telescope (250 mm, f/5, 310 sec).
Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 31 10 sec images taken with a Vaonis Vespera-Pro Telescope (250 mm, f/5, 310 sec).

Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 90 10 sec images taken with a Vaonis Vespera-Pro Telescope (250 mm, f/5, 900 sec).
Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 90 10 sec images taken with a Vaonis Vespera-Pro Telescope (250 mm, f/5, 900 sec).

Thursday (05-December-2024) — New Jersery

Eleven-Years Ago Today. Troll Family Holiday viewing the Northern Lights. Digital Art, New Jersey and Tromsø, Norway. (05-Dec-2013)

Comet C/2023 A3 (Tsuchinshan–ATLAS)

I missed the comet for the past several nights due to early evening clouds and even some much-needed rain. The comet is getting fainter and the tail shorter. The magnitude is now 9.9. The first image is a composite of 31 images (5 min 10 sec) and the second one is a composite of 59 images (9 min 50 sec). In the second image there is some movement of the comet head. Also, the comet is moving into a region of the sky with part of the milky way in the background (many more faint stars).

Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 31 10 sec images taken with a Vaonis Vespera-Pro Telescope (250 mm, f/5, 310 sec).
Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 31 10 sec images taken with a Vaonis Vespera-Pro Telescope (250 mm, f/5, 310 sec).

Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 59 10 sec images taken with a Vaonis Vespera-Pro Telescope (250 mm, f/5, 590 sec).
Comet C/2023 A3 (Tsuchinshan–ATLAS). Composite of 59 10 sec images taken with a Vaonis Vespera-Pro Telescope (250 mm, f/5, 590 sec).