Galaxy season is back, and I’m going hunting in the deep sky. Among tonight’s targets is NGC 5907, the “Splinter Galaxy” in the constellation Draco. Part of the NGC 5866 galaxy group, this edge-on spiral is 50 million light years away. At a length of 120,000 light years long, it’s one of the largest edge-on systems visible in a small telescope, with a mass of 250 billion Suns. NGC 5907 is well-known for its warped disk and a dramatic arc of stars that suggests a recent collision with another galaxy. It also lacks the number of giant stars expected of a spiral galaxy [Read more…] about From the Observer’s Log: The Splinter GalaxyShare This:
Recent Astronomy Articles at Cosmic Pursuits
Located in the Diablo mountain range east of San Jose, California, Lick Observatory is the world’s first permanently occupied mountain-top observatory. It was founded in 1888 and has been part of the University of California ever since. This image by reader Marilyn Perry shows the Full Moon rising over the observatory in May 2015.
The location of Lick on Mt. Hamilton provides calm air and excellent viewing despite ambient light and pollution. The peak is normally above the level of the low cloud cover often seen in San Jose. The peak provides a stunning view to the west of the Valley of Heart’s Delight, now better known as Silicon Valley. To the east, the Sierra’s can be seen on a very clear day [Read more…] about Full Moon Over Lick ObservatoryShare This:
It’s a good time for seeing planets. Venus moved past the Pleiades and Hyades star clusters in early April. Now it’s Mercury’s turn. In this image, you see the speedy little planet near the two famous star clusters on May 1, 2015. The Hyades star cluster is tangled in the branches at left. For the next week, Mercury makes its best appearance this year in the western sky after sunset. Venus is much higher above the horizon after sunset, and Jupiter higher still. Saturn rises in the east before midnight, its rings tilted dramatically, as it moves to its closest approach to Earth later in May.Share This:
Thursday, April 30, 2015
1. See the Eta Aquariid Meteor Shower
The usually reliable Eta Aquarid meteor shower peaks on the night of May 5-6 this year. The shower runs from April 21 – May 20, 2015, with many meteors still visible for several days on either side of the peak. It’s perhaps the best meteor shower of the year for southern hemisphere stargazers, and it’s pretty good for northerners too. The meteors are sandgrain-sized bits left over from Halley’s comet. Like most such showers, the best viewing is just before dawn.
2. Lights Out for Dark Energy?
Astronomers at the University of Arizona announced one of the ‘standard candles’ of the universe, exploding stars called Type Ia supernovae, may not be so standard after all. They found more distant Type Ia supernovae might be intrinsically fainter than more nearby events, suggesting the accelerating expansion of the universe is not as pronounced as once thought. This may mean the effect of the mysterious ‘dark energy’ that causes the expansion is also less important. But that doesn’t disprove the existence of dark energy. As Ethan Siegel explains, there are two more independent observations that show something like dark energy (whatever it may be) still accounts for the majority of the universe.
3. New Images of Pluto and Charon
Yesterday, NASA released rather stirring images from the New Horizon’s spacecraft of Pluto and its Texas-sized moon Charon revolving about their common center of mass. The images also show Pluto rotating about its axis, and large-scale surface features on the former planet’s surface. These are the best images yet captured. The view will only get better as New Horizons gets closer to its brief but historic rendezvous with Pluto just 11 weeks from now.
4. Happy Birthday, Hubble
Well, this makes me feel old, but NASA marked the 25th anniversary of the launch of the Hubble Space Telescope last week. The redoubtable instrument, which began its career with a malformed primary mirror, has revolutionized professional astronomy and helped astronomers to generate more knowledge and understanding of the universe in the past 25 years than in the previous 200 years. Hubble helped refine our understanding of the age of the universe, detect atmospheres on exoplanets, and find millions of galaxies in parts of the sky where no galaxies had been seen before. The New York Times has a brief retrospective video on the launch and legacy of Hubble. And Phil Plait published his favorite “12 1/2” images from Hubble in his column at Slate.
5. Jupiter Through an iPhone
Ottawa-based stargazer Andrew Symes continues to refine his imaging techniques using an iPhone and an 8″ Celestron NexStarSE telescope. An iPhone! The small sensor and pixel sizes of smartphone cameras make them unlikely candidates for astrophotography. But clever developers have created apps that enhance the low-light operation of the iPhone camera. So with a little practice and standard post-processing techniques, Symes has shown it’s possible to take quite acceptable images of Jupiter, Saturn, the Moon, and even brighter deep-sky sights directly at the eyepiece of a telescope with an iPhone.
Wishing you clear skies,
Publisher, Cosmic Pursuits
Thursday, April 23, 2015
1. Chandra’s Limit
In which your publisher recounts his youthful brush with astrophysical greatness, and attempts to explain why there are no fat white dwarf stars in the universe. (Yes, the two topics are related… sort of).
2. Mercury Appears… and Gets Smacked!
Just as the planet Venus skimmed the Pleiades star cluster after sunset a few weeks ago, the tiny planet Mercury does the same this week on April 30, 2015. You can see planet and star cluster low in the northwestern sky just after sunset. And remarkably, on the same day, NASA’s MESSENGER spacecraft ends its mission by slamming into Mercury at 8,000 mph. It’s a big day for the little planet!
3. Messier 13 Returns
As a chronic insomniac, I often wander out late at night to see what’s coming over the eastern horizon (fact: you can tell how little sleep I’ve had by the average number of typos in these emails). Anyway, I noticed mighty Hercules wheeling into view last week, which brought me thoughts of my favorite summer stars. This short piece on M13 will help get you in the mood for stargazing, and it features a fine image from a young stargazer living in the washed out skies of London, U.K.
4. A Conspiracy of None
The final article on the ‘retired’ One-Minute Astronomer site tells of the return of the mysterious ‘white spots’ on the dwarf planet Ceres. The spots returned to view this week as the Dawn spacecraft maneuvered into a different orbit to take a look at the lighted side of this small world. The conspiracy theorists have been silenced… for now.
Finally, for you astronomical art collectors out there, my friend Terry Hancock is offering for auction on eBay a signed one-of-a-kind aluminum print of his magnificent image of Orion ‘Clouds of Creation’. The print is 40″x95″ on an aluminum base that has the gleam of a new car finish. ideal for the rich detail in this panorama. The image on this museum-grade print was made from 420 individual exposures. See the auction at this link…
Wishing you clear skies,
Publisher, Cosmic Pursuits