Time to catch up on the news. The sun is positively peppered with sunspot groups but they’ve been mostly well-behaved with few flares to shows for so much spottiness. Just the same, there’s a good chance for minor auroras across the northern U.S. and Canada this evening from something else in the sun’s bag of tricks – a coronal hole.
Look low along the northern horizon for a greenish glow during the early evening hours . Views will be compromised after about 9 p.m. when the moon is up high enough to spill light across the sky.
Let’s not forget the supernova in the Pinwheel Galaxy in the Handle of the Big Dipper. At magnitude 11.7, it’s still within easy range of 6-inch and larger telescopes. Amazing to think that the supernova, discovered on August 24, is nearly two months “old” and continues to blaze so brightly. Catch it as early as you can at the end of evening twilight before it drops below the trees and roofs. Maps for finding it are here in this earlier blog.
There’s a discussion going on right now among comet observers about whether Comet Elenin is visible or not. Tomorrow, what’s left of the comet makes its closest approach to Earth at 22 million miles. This was the time we’d all been hoping to see it near naked eye brightness, but it crumbled in August and the remaining icy fragments have all but vaporized away in the sun’s heat.
Two positive observations of Elenin were made about a week ago by trustworthy observers under excellent skies, but larger telescopes and long time exposures have shown nothing. Other experienced visual observers have also had no success. Granted, they were all battling low altitude and the glow of the zodiacal light. What the two observers would have seen was the faint, residual dust cloud left in the wake of the breakup. The next opportunity to see Comet Elenin will be in about a week, when it will be much better placed in a dark morning sky. Expect lots of amateur astronomers to be out with scopes and cameras for one last attempt. I’ll have more news then.
Despite Elenin’s poor showing, there’s no need to hang your head. Comet Garradd is still going strong at around magnitude 7.5 during the early evening high in the western sky near the border of the constellations Hercules and Ophiuchus (oh-fee-YOU-cuss). From a dark sky it looks like a small, fuzzy puff in binoculars. Telescopes will show a bright comet head or coma and faint tail pointing east. The moon is now rising late enough to provide the dark sky you’ll need for the best view.
Don’t forget to look for the X-ray telescope ROSAT tonight we talked about yesterday. Now that its orbit is dropping lower, the doomed satellite has been reported as bright as 1st magnitude! Scroll down to Friday’s blog for links on how to find it.
And finally, I’ll leave you with a couple recent pictures taken by the Dawn spacecraft of a dark-rayed crater and one of the highest mountains in the solar system.These wonders of nature are found 168.5 million miles from your doorstep on the asteroid Vesta.