Not Much Again.............

Here's a current super novae I haven't mentioned this week.

Supernova 2011dh, which was discovered in the Whirlpool Galaxy, M51, on May 31st, has been brightening ever since — though the brightening is now levelling off. As of June 16th the supernova was about V magnitude 12.6 and visible in a lot more amateur telescopes. 

Well so much for last weeks eclipse, which wouldn’t have been overly fantastic even if it hadn’t been cloudy, which it obviously was, but never mind there’s another one on December the 10^th, but its at 2:30 in the after noon but we should catch the tail end of as the moon rises at about 4, with the sun setting shortly afterwards. Putting disappointing lunar eclipses to one side, which is always a little traumatic, this week, is much last week. But we do have an event coming up in less than a half hour, at 8:16 in fact, summer starts and the axis of the earth’s rotation starts to edge away from the sun. So today is the longest day, with about 16 hours of daylight. This gives me an excellent opportunity to waffle.

The Earths axial tilt is 23.4 degrees and it always points in the same direction throughout the year, which means it changes with respect to the sun. In spring and summer towards and in autumn and winter away from the sun. At the equinoxes the tilt is at right angles to the sun and we have equal days and nights. Now 23 and half degrees may not seem much but double it and it makes the sun 47 degrees higher today at noon than it will be in mid winter, which is a lot. Now you may have noticed that the rate of change of daylight hours is much slower now or in mid winter than it is in early spring or autumn. It’s best thought of as a pendulum effect, at 8:16 the days stop getting longer and begin to slowly get shorter. The pendulum has reached the top of its swing and starts to fall the other way and begins accelerating again down to the bottom of the swing, which next happens at the autumn equinox, when the swing begins to slow again toward the winter solstice when it will stop and then begin to fall toward mid summer again. And like any pendulum effect the swing is always faster at the bottom slowing to zero at the top.

Now because we had a full moon last week, we have a last quarter moon this week which will rise in the early hours and means that when the stars do come out form 11pm onwards they will be showing well, this of course is under the rather optimistic assumption that the skies ever clear, well if the do the milky way should be lovely arcing over head the North East to the South East, and there’s always the possibility of shooting stars, not that we are expecting a shower at the moment.

As for the planets bar Jupiter and Saturn they are all to close to the Jupiter at the Aries-Pisces border shines in the east during dawn, if you’re up and about it will just about the only thing of note in that part of the sky.

Saturn is in fine view in the south to southwest after dusk. And just ¼° to its upper right is fainter Porrima (Gamma Virginis), turning Saturn into a naked-eye "double star." Shining 15° to Saturn's left is Spica.

And that was your night’s sky for the week ending on the 120^th anniversary of The Street railway in Ottawa, Ontario, Canada, commencing operation.

Götterdämmerung Postponed.

Very much the same in the pre midnight sky this week, in fact if you haven’t noticed yet, the sky shifts by a smidgen less then 7degrees to the west each week, or 360 degrees dived by 52 weeks. This is why we don’t get a great deal of change week by week. The planets give us a bit more variation because the obviously move against the fixed background of the sky.

Early Friday morning,  if your one of the legion of listeners who live in the Western United States a pretty unimpressive star, Nu Pegasi, will be occulted for up to 1.2 seconds by the small asteroid 4569 Baerbel along a thin track (only 9 miles wide!) running from southernmost California through Arizona, Colorado, and the Dakotas. The star will be low in the southeast. But blink and you’ll miss it.

Summer almost upon us and we’re into the brightest 6 weeks of the year now which means the summer constellations are appearing Scorpio is up in the South East now. The brightest star in the east these nights is Vega. You can't miss it. Look for the little triangle-and-parallelogram pattern of the constellation Lyra dangling to its lower right.

We have a new moon tomorrow, so more spring tides.

The planets are a little better this week Saturn is a little West of South when it gets dark, and Saturn has a mate this week. Saturn and the star Porrima have now closed to 17 arc minutes of each other, practically as close as they will get. Although they look like neighbours, Saturn is only 76 light-minutes from Earth, while Porrima is 39 light-years in the background. That's more than a quarter million times farther away!

Low in the dawn, Mercury, Venus, Mars, and Jupiter continue drawing farther apart in a long diagonal line. Jupiter is the highest and easiest. Far to its lower left are faint Mars, then bright Venus, and then very-low Mercury, as shown in the scenes above. Bring binoculars for Mars and Mercury. If you’re up an hour before the sun look east Venus and Jupiter should be unmissable.

Now for some news about the Black Shadow’s deadly gamma ray space laser, apparently the chap who set up the orbital synchronous lock was a bit of a cowboy and Barbara’s doomsday machine is now sedately heading for a low lunar orbit which will render it useless. But I have been told by a very unreliable source that she is hoping to get it up and running in time for the next projected end of the world on October 21^st, keep your fingers crossed.

And that was your nights sky for the week ending on the 167^th anniversary of the founding of  The Young Men's Christian Association.

Lyrid Meteor Shower And Jesus

Not much movement this week, but we do have a lack lustre meteor shower latter peaking on Friday.

Vega, the "Summer Star," is now rising in the northeast right around the end of. Later in the night as Vega rises higher, look for its dim little constellation Lyra dangling from it toward the lower right.

The radiant of the Lyrid meteor shower is Magnified in the NE.

Which bring us to this week’s high light, The Lyrid meteor shower should peak late on Friday, but it's usually quite weak. The best chance to see an occasional Lyrid will be around midnight, when Lyra is up fairly high but the Moon hasn't yet risen. So look to the North East after 10pm and you may see a few from Wednesday to as late as Monday, but this shower is by no means the best of the year.

Now the planets, for what it’s worth Mercury, Mars, and Jupiter are buried deep in the glare of sunrise (well to the lower left of Venus), pretty well in a wasted conjunction.

Venus (still a respectable magnitude –3.9) is visible very low in the dawn. Look for it above the eastern horizon about 30 minutes before sunrise. But it won’t be showing well if at all.

But we still have Saturn which is still the only planet showing well. After passing through opposition on April 3rd, it glows low in the east-southeast as the stars come out. Saturn rises higher in the southeast during evening and shines highest in the south around midnight. Look for twinkly Spica 12° below it or to its lower left. Don't confuse Saturn with brighter Arcturus 30° to its left or upper left.

A small telescope will always show Titan, Saturn's largest moon.

And that was your night sky for the week ending on Batman’s 72^nd birthday. 

And as it's Passion Week here's a picture of Jesus.

The Song Remains The Same

A pretty worthless week again, pretty well exactly the same as last week, and next week for that matter.

We have Venus but barely, it rises just before the sun and is visible for a very limited period and Saturn, it glows low in the east as the sun sets and is about to set in the west as the Sun sets. The planet is pretty well due south at midnight. It’s fairly easy to spot. There are 3 bright stars, one being Saturn, in that area of the sky, Arcturus which is the brightest star in bo o teas which helpfully is written as bootes, is quite a bit higher and further to the east of Saturn and the other is Spica, or Spy ka the brightest star in Virgo which is a little below and to the right of Saturn. So Saturn’s the middle one. And that’s about it.

Now I’m going to waffle about the moon for a bit. Now you may be wandering why Easter is so stupidly late this year. Well it’s the moon’s fault, not that it’s overly contrite about it. Basically Easter, which if you don’t know, is a pretty bizarre myth about an alleged charismatic Jewish carpenter coming back to life on a Sunday around 2000 years ago, it’s not as barking as some of the Norse stuff, but it’s getting there, anyway this bloke was allegedly crucified during the Jewish Passover, which is based on an even more barking great escape myth from around 3500 years ago, there’s book full of this stuff if your interested. Anyway the Passover starts on the first full moon after the spring equinox which is next Monday. So Easter is the first Sunday after the first full moon after the Spring Equinox. So it’s all a bit primitive. Easter is on the 24^th of April, the 25^th being the latest it can be. And that won’t happen again until 2030, when I’ll be 79. The March full moon this year was on the 19^th two days before the start of Spring. The earliest Easter can be is the 22^nd when the March full moon falls on the spring equinox. Anyway next year it’s much better it’s on then 8^th.  I hope that was clear.

And that was your night sky for the week ending on the 81^st anniversary of BBC Radio announcing that there is no news on April the 18^th 1930. Be nice if they did it again, though Sky News would find something somewhere, and failing that Keri definitely would.