Northern

Northern backyard stargazers can get a good monthly guide to the heavens with this relaxing and easy on the ear Night Sky video. “Tonight’s Sky” is produced by HubbleSite.org, online home of the Hubble Space Telescope.

 Constellations, Deep-Sky Objects This Month

INFOGRAPHIC
As we approach the longest day of the year and greet the warmest nights with open arms, there are a number of awe-inspiring celestial events to keep in mind during the summer months – most notable is the total solar eclipse in the USA. – Valid for the next three months, which will present us with some valuable celestial events.  Source: Universe2go Blog

Summer Infographic - Solar Eclipse!!!

On This Day

4th 1997Mars Pathfinder (USA) lands on Mars.

4th 1054, Chinese and other astronomers witnessed the supernova explosion that produced the Crab Nebula.

6th 1687, Isaac Newton (UK) published ‘Principia Mathematica’.

8th 2011, The space shuttle Discovery (USA) was launched on the final mission for the shuttle program.

10th 1962Telstar (USA) the first private telecommunications satellite was launched.

11th 1979Skylab 1 (USA) was destroyed during re-entry over central Australia.

14th 1965Mariner 4 (USA) made the first controlled flyby of Mars and returned the first close-up images of the planet.

15th 1975, the first USA/USSR space project Apollo-Soyuz was launched.

17th 1850, W.C. Bond and J.A. Whipple (USA) take the first photograph of a star.

20th 1969Apollo 11 (USA) lands on the Moon. At 12:39pm AEST (21st) Neil Armstrong became the first person to walk on the Moon.

23rd 1999, The Chandra X-ray Observatory (USA) is launched from the space shuttle Columbia.

25th 2000, The International Space Station starts to take shape with the installation of the Russian Service Module.

 

 

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Want to become a better astronomer? Learn your way around the constellations! They’re the key to locating everything fainter and deeper to hunt with binoculars or a telescope.

This is an outdoor nature hobby. For an easy-to-use constellation guide covering the whole evening sky, use the big monthly map in the center of each issue of Sky & Telescope, the essential guide to astronomy.

Pocket Sky Atlas, jumbo edition

The Pocket Sky Atlas

Once you get a telescope, to put it to good use you’ll need a detailed, large-scale sky atlas (set of charts). The basic standard is the Pocket Sky Atlas (in either the original or Jumbo Edition), which shows stars to magnitude 7.6.

Next up is the larger and deeper Sky Atlas 2000.0, plotting stars to magnitude 8.5; nearly three times as many. The next up, once you know your way around, is the even larger Uranometria 2000.0 (stars to magnitude 9.75). And read how to use sky charts with a telescope.

You’ll also want a good deep-sky guidebook, such as Sue French’s Deep-Sky Wonders collection (which includes its own charts), Sky Atlas 2000.0 Companion by Strong and Sinnott, or the bigger Night Sky Observer’s Guide by Kepple and Sanner.

Can a computerized telescope replace charts? Not for beginners, I don’t think, and not on mounts and tripods that are less than top-quality mechanically (meaning heavy and expensive).

And as Terence Dickinson and Alan Dyer say in their Backyard Astronomer’s Guide, “A full appreciation of the universe cannot come without developing the skills to find things in the sky and understanding how the sky works. This knowledge comes only by spending time under the stars with star maps in hand.”

The Pocket Sky Atlas plots 30,796 stars to magnitude 7.6 — which may sound like a lot, but it’s less than one per square degree on the sky. Also plotted are many hundreds of telescopic galaxies, star clusters, and nebulae. Shown above is the new Jumbo Edition for easier reading in the night. Click image for larger view.

 Skywatching Terms

  • Asterism: A noteworthy or striking pattern of stars within a larger constellation.
  • Degrees (measuring the sky): The sky is 360 degrees all the way around, which means roughly 180 degrees from horizon to horizon. It’s easy to measure distances between objects: Your fist on an outstretched arm covers about 10 degrees of sky.
  • Visual Magnitude: This is the astronomer’s scale for measuring the brightness of objects in the sky. The dimmest object visible in the night sky under perfectly dark conditions is about magnitude 6.5. Brighter stars are magnitude 2 or 1. The brightest objects get negative numbers. Venus can be as bright as magnitude minus 4.9. The full moon is minus 12.7 and the sun is minus 26.8.
  • Terminator: The boundary on the moon between sunlight and shadow.
  • Zenith: The point in the sky directly overhead.

Night Sky Observing Tips

  • Adjust to the dark: If you wish to observe faint objects, such as meteors or dim stars, give your eyes at least 15 minutes to adjust to the darkness.
  • Light Pollution: Even from a big city, one can see the moon, a handful of bright stars and sometimes the brightest planets. But to fully enjoy the heavens — especially a meteor shower, the constellations, or to see the amazing swath across the sky that represents our view toward the center of the Milky Way Galaxy — rural areas are best for night sky viewing.
  • If you’re stuck in a city or suburban area, a building can be used to block ambient light (or moonlight) to help reveal fainter objects. If you’re in the suburbs, simply turning off outdoor lights can help.
  • Prepare for skywatching: If you plan to be out for more than a few minutes, and it’s not a warm summer evening, dress warmer than you think necessary. An hour of observing a winter meteor shower can chill you to the bone. A blanket or lounge chair will prove much more comfortable than standing or sitting in a chair and craning your neck to see overhead.
  • Daytime skywatching: When Venus is visible (that is, not in front of or behind the sun) it can often be spotted during the day. But you’ll need to know where to look. A sky map is helpful. When the sun has large sunspots, they can be seen without a telescope. However, it’s unsafe to look at the sun without protective eyewear. See our video on how to safely observe the sun, or our safe sunwatching infographic.
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