September 9: Membership Meeting / Dark Matter and Gravity

Photo: Stacy McGaugh.
Dr. Stacy McGaugh. Image Credit: CWRU

The September 2019 meeting of the Cuyahoga Astronomical Association (CAA) will feature a presentation by Dr. Stacy McGaugh, Case Western University Professor and Chair of Astronomy. In “Dark Matter and Gravity in the Universe,” Dr. McGaugh will discuss his work on the search for dark matter and the possibility that it does not exist and we simply do not understand gravity! He has co-authored several papers outlining this controversial view.

The CAA’s monthly meetings are held on the second Monday of every month except December at 7:30 p.m. in the Rocky River Nature Center; 24000 Valley Parkway; North Olmsted, Ohio, in the Cleveland Metroparks. Meeting programs are open to the public. Following the presentation and a brief social break, the club will conduct its membership business meeting.

Seeing Stars Saturday!

Simulated View of Saturn and Moons as they will appear Saturday, September 7, at 9:30 PM EDT. Image via Gas Giants.
Seeing Stars Saturday! Coming this weekend: from 9 to 11 PM at Medina County Park District’s Letha House Park West on Saturday, September 7: Visit our observatory and peer through telescopes at our amazing cosmos. Planets Saturn and Jupiter will be spectacular, the Moon will be bright! And let’s not forget amazing star clusters; they would be sad if we did not look at them. {Such showoffs.}
Public observing nights are conducted in the open night air so dress appropriately for fall-like temperatures. There may also be mosquitoes so insect repellent may be a good idea.

Hubble Space Telescope provides a new portrait of Jupiter

Photo: Jupiter as imaged by the Hubble Space Telescope on June 27, 2019.
The NASA/ESA Hubble Space Telescope reveals the intricate, detailed beauty of Jupiter’s clouds in this new image taken on June 27, 2019 by Hubble’s Wide Field Camera 3, when the planet was 644 million kilometers from Earth — its closest distance this year. The image features the planet’s trademark Great Red Spot and a more intense color palette in the clouds swirling in the planet’s turbulent atmosphere than seen in previous years.
Credit: NASA, ESA, A. Simon (Goddard Space Flight Center), and M.H. Wong (University of California, Berkeley) Click here for full-size image!

Among the most striking features in the image are the rich colors of the clouds moving toward the Great Red Spot. This huge anticyclonic storm is roughly the diameter of Earth and is rolling counterclockwise between two bands of clouds that are moving in opposite directions toward it.

As with previous images of Jupiter taken by Hubble, and other observations from telescopes on the ground, the new image confirms that the huge storm which has raged on Jupiter’s surface for at least 150 years continues to shrink. The reason for this is still unknown so Hubble will continue to observe Jupiter in the hope that scientists will be able to solve this stormy riddle. Much smaller storms appear on Jupiter as white or brown ovals that can last as little as a few hours or stretch on for centuries.

The worm-shaped feature located south of the Great Red Spot is a cyclone, a vortex spinning in the opposite direction to that in which the Great Red Spot spins. Researchers have observed cyclones with a wide variety of different appearances across the planet. The two white oval features are anticyclones, similar to small versions of the Great Red Spot.

The Hubble image also highlights Jupiter’s distinct parallel cloud bands. These bands consist of air flowing in opposite directions at various latitudes. They are created by differences in the thickness and height of the ammonia ice clouds; the lighter bands rise higher and have thicker clouds than the darker bands. The different concentrations are kept separate by fast winds which can reach speeds of up to 650 kilometers per hour.

These observations of Jupiter form part of the Outer Planet Atmospheres Legacy (OPAL) program, which began in 2014. This initiative allows Hubble to dedicate time each year to observing the outer planets and provides scientists with access to a collection of maps, which helps them to understand not only the atmospheres of the giant planets in the Solar System, but also the atmosphere of our own planet and of the planets in other planetary systems.

It’s more than just a bright light

The International Space Station – August 2, 2019. Photo by James Guilford.

It is possible to get images of the International Space Station (ISS) that show more than a beautiful, bright streak across the night sky. Outside of the spit-second timing of shooting the ISS’s silhouette against the Sun or Moon, one rarely sees images of the station as it moves across the starry night sky. “I thought I’d take advantage of Friday night’s (August 2, 2019) brilliant pass and try a still photo of the station,” wrote photographer and CAA member James Guilford. “I’d actually been wanting to try this for some time. Getting focus right turned out not to be as difficult as getting the exposure right and the darned thing was just brilliant — I overexposed by possibly two stops. While I lost out on station details but for some solar panels, I did pick up some background stars! This was my second try at a still image. Third time’s the charm?”

Here’s the equipment list and exposure info:

  • Canon EOS 7D Mark 2
  • Canon EF400 FL Telephoto Lens (The camera’s cropped sensor makes the 400mm the close equivalent to a 600mm lens.)
  • Shutter: 1/1,600 sec.
  • Aperture: f/5.6
  • ISO: 4,000
  • Finally: Heavily cropped, exposure adjusted in Photoshop

How was the camera guided? “The camera and lens were handheld and hand-tracked” he explained. “My experience with photographing birds and dragonflies in flight helped!”

The target is very small and moves quickly across the sky. Guilford wrote, “Much is made of the fact the ISS spans a space about the size of a football field but you’re trying to photograph that football field from more than 250 miles away! It. Is. Small.”

A star to steer her by

Marblehead Light with Star Trails. Photo by Alan Studt.
Marblehead Light with Star Trails. Photo by Alan Studt.
A nighttime visit to Lake Erie’s Marblehead Lighthouse provided the perfect opportunity for the Cuyahoga Astronomical Association’s Alan Studt to create this beautiful image. This nightscape isn’t a simple, single-exposure image as done in the old film camera days.
Here’s what went into making this picture:
  • Shot an approx. 22-minute star trail between 11:30 and Midnight (100 – 13 second shots at ISO 3200).
  • Edit out dozens of airplanes – probably all but a handful of the shots had multiple planes flying by.
  • Foreground is made of 45 images median stacked equaling about a nine-minute exposure.

Tools:

  • Nikon D850
  • Tamron 15-30mm @ 15mm, f /2.8
  • Post done in Sequator, StarTrails.exe, Lightroom, and Photoshop
“Beautiful evening!” says Studt. We agree, and thanks for sharing!

 

Beautiful North America

Photo: The North America Nebula by Lonnie Dittrick
The North America Nebula by Lonnie Dittrick

This image was captured by the Cuyahoga Astronomical Association’s member Lonnie Dittrick. The astrophotographer reports it took “fifty-two 90-second light frames over two nights (fighting waning gibbous moon and smoke from Canada)” from his backyard in Northeastern Ohio.

The North America Nebula (NGC 7000 or Caldwell 20) is an emission nebula in the constellation Cygnus, close to Deneb (the tail of the swan and its brightest star). The remarkable shape of the nebula resembles that of the continent of North America, complete with a prominent Gulf of Mexico.” — Wikipedia