Archive for the ‘Sun’ Category

And THIS is a Sun-grazing comet!

Wednesday, May 11th, 2011

The solar neighborhood is busy this week, with a fantastic solar eruption on Monday and now a sun-grazing “Kreutz” comet on Tuesday! These images were compiled from the SOHO/LASCO C2 database:

SOHO’s LASCO instrument is a set of two coronagraphs that image the solar corona from about 462-thousand to about 13.4-million miles. A coronagraph is a telescope that blocks light from the solar disk, and the corona is the plasma atmosphere surrounding the Sun. C2 has a 3-degree field of view and C3 has a 16-degree field of view. The Sun, by comparison, is 0.5-degrees across – you can see it as the white outlined circle in the center of the LASCO images.

Click here to see SOHO launching from Cape Canaveral in December 1995. Click here to see the latest SOHO images. Click here to learn more about Kreutz and other sungrazing comets.

Now THIS is a Solar Eruption!

Monday, May 9th, 2011

I love checking SOHO’s latest LASCO C2 data and finding something like this:

As you can see by the UTC timestamps, these images were acquired by SOHO earlier today. This flare was huge, but it poses no direct threat to us. It does, however, impact our spaceweather. NASA’s latest solar mission, SDO, is teaching us more about that impact.

Celebrate the Sun

Tuesday, April 12th, 2011

… and then share it with others! This morning, SOHO’s LASCO C2 instrument captured a beautiful solar eruption through the LASCO cameras – perfect timing for this weekend’s #GAM2011 SunDay event. Meanwhile, NASA’s SDO is measuring the properties of the activity, while STEREO provides stereoscopic and radio data.

More Fun in the Sun: SOHO’s Our Star the Sun — SDO’s The Sun Now —  STEREO’s latest In-Situ and Radio Spaceweather Beacon Data

Global Astronomy Month 2011 is here!

Monday, April 4th, 2011

Global Astronomy Month 2011 is in full swing and we encourage everyone to get involved, whether by hosting your own outreach or local event, or by attending one of the many local and virtual presentations! Our favorites are SunDay and 30 Nights of Star Peace, which we’ll be promoting through local events, outreach flyers, and newspaper articles. We’re also big fans of STAR and AstroBookDrive, which encourage donations of surplus astronomy equipment and books for developing countries. (Global Astronomy Month is an excellent time to donate your gently-used books and equipment!)

If you’re on Twitter, you can help to promote Global Astronomy Month by simply including the #GAM2011, #SunDay, and/or #StarPeace hashtags in your related tweets.

Another one bites the (star)dust

Thursday, October 21st, 2010

SOHO has captured another Kreutz Sungrazer comet plunging towards the Sun this week.  Kreutz Sungrazers, named for astronomer Heinrich Kreutz and the comets’ “sun-grazing” orbits, are believed to be the fragments of a super-comet that broke apart some 2,000 years ago.

While most of these fragments can be measured in meters, there are the rare “Great Comets”  that are visible even in the daytime sky.  This particular comet was not one of those larger fragments, nor did it actually dive “into” the Sun as it appears to in the movie; rather, it is passing within such close proximity as to be completely disintegrated.

Many of the Kreutz Sungrazers are discovered by amateur astronomers.  This particular fragment was discovered by Chinese comet-hunter Bo Zhou.  Click here to learn how you can use SOHO images to discover your own sungrazing comets!

(*Credit Note: Fragmentation hierarchy of bright sungrazing comets and the birth and orbital evolution of the Kreutz system. I. Two-superfragment model: http://hdl.handle.net/2014/39288)

Billions of Eyes are Waiting – for You!

Tuesday, March 16th, 2010

What do Sun-Earth Day, the Spring Equinox, and International Sidewalk Astronomy Night have in common?  In addition to recognizing our planet’s relationship to the cosmos, this year all three occur on March 20 and you can celebrate  in one fun event!

International Sidewalk Astronomy Night:

Billions of Eyes are waiting!

It is with those words that John Dobson encourages all of us to share the night sky with others.  On March 20, people all across the world are taking Dobson’s words to heart with the 4th Annual International Sidewalk Astronomy Night!

You don’t have to be an astronomer, or even own expensive equipment, to encourage others to Look Up – just take your knowledge, your binoculars, or your telescope to a public setting and share what you do know and have with others.  It doesn’t even matter that public settings are typically not the darkest sites to observe.  There’s plenty of wow-factor with the Moon, Venus, Mars, Saturn, and some of the brighter stars – especially if you take a moment to share some fun facts about each.  Public settings also offer the perfect opportunity to talk about light pollution.  You could even hand-out a few flyers about responsible lighting techniques to make your event more meaningful!

Whether you live in a small town or a big city – whether you’ve a telescope, a pair of binoculars, or even just your eyes – whether you share with one person or a hundred – the point is to get out there and encourage people to look up.  Show them why you’re so excited about the night sky and why they should be too!

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