Tuesday, January 31, 2006
Stormy Petrel on a Stick
On the ground they are rubbish, they don't land they crash, in messy tumbling heaps. They also sound like evil mutant Kookaburras. I had plenty of time to observe them as I waited near their colony, the only mainland colony of Mutton Birds in Australia, in order to guide my Brother-in-law to our campsite at Port Fairy. Of course, I was waiting in the wrong spot, so I saw a lot more Mutton Birds than I intended. These Mutton Birds (so called because they were so plentiful sailors used them as a food supply, then nearly made them extinct) live in burrows in the sand, and watching them send showers o sand into the sky reexcavating their burrows is an amazing sight.
If you are going to go camping when most of the campsites in Southern Victoria are on fire, then Port Fairy is a good place, a beautiful old port town, it has lots of historic building, miles of fantastic coastline just begging to be walked, fascinating rock pools, lazily stirring kelp beds ... and dark skies.
Not perfect dark skies, the sea spray and the few lights that the town has do conspire a bit against you, but a delightful strand of the Milky way soared above my head on the one night it was clear (Port Fairy is also good for foul weather). I watched Saturn swim into view one night before opposition, marveled at Orions Nebula and renewed my acquaintance with many of my favorite southern clusters. I also took a lot of images for stacking.
I'm currently in Sydney, at the Australian Neuroscience Society conference. When I get back, I'll post some of these images after I've had a play with stacking.
In the meantime, it's back to checking the program to see what I'm going to see next. I don't think I'll have time for live neuroscience blogging, but I'll try and post a summary when I get back too.
Wednesday, January 25, 2006
What, Orion again?
Monday, January 23, 2006
Feeling the heat
As you can guess this has had a damping affect on my astronomy, even tonight now that the cool change has come through (it only got up to 29 today, cool and refreshing), the stars are jittering around like crazy, it's not worth taking the scope out, Saturn would be just recognizable though the jitter, a pretzel on acid. I've been content to go swimming in the evenings and stare at the stars while floating in the lukewarm water (still cooler than the air).
Even writing about astronomy, and telling you folks about the latest amazing results from Mars and so on has been impossible, the study with the computer in is the hottest part of the house, even if I did have the will to move from the coolest part of the house (the living room, where the entire family has been sleeping during the heat), slowly cooking in front of a computer is not my idea of fun. Tonight is the first night I'm not in danger of short circuiting the computer through my sweat.
Of course, with the heat, bushfires have broken out all over, there are massive fires in Western Australia, Victoria, South Australia and Tasmania. Just to the north-east 80,000 hectares have been burnt out in Ngarkat conservation park, over in Victoria a similar number of hectares has been burnt out in the Grampians, which was where we were going to be camping this weekend. With near 40 degree temperatures predicted, we are not going anywhere near there (sadly, this is one of our favorite spots). It's hard to convey the scope of fires that are bigger than some (very small) European countries (The Ngarkat fire is about the size of Luxembourg, the Grampians fire is about 1/20th the size of Wales). Three people are dead and over 20 homes lost.
On Sunday, after the obligatory swim, we hid out in an air-conditioned cinema for a freinds child's birthday party, hoping the cool change would have arrived by the time we came out. It had, but so had a huge plume of smoke form the Kangaroo Island fires (a mere 20,000 hectares burning), the entire street (heck the entire city) was shrouded in smoke, the semaphore tower rising erirly from the gloom, and the air smelt of acrid, well, smoke, as it would. Not a vast improvement over baking heat, I felt.
So, not much astronomy, either real or virtual and not many posts from me.
Saturday, January 21, 2006
From Left to right, Orion, stack of 5x6 seond exposures; Orion, single six second exposure; Star Map of Orion for comparison. As usual, click on the images to see a full sized version.
Thanks to Megan, who suggested stacking exposures to increase sensitivity, I went out last night to try it out. The resuklts you can see above. I took 5x six second exposures on my Olympus muj:300 (in night mode with flash off and super high quality resolution) and stacked them in iPhoto4. This is suboptimal as iPhoto doesn't have a real stacking mode, I used stich at 50% transparency instead (must get PaintshopPro 9). I then adjusted gamma to an outrageous 2.33, and adjusted brightness up by 10 (so you can actually see it in the thumbnails).
Anyway, with just 6 images stacked, the results weren't markedly better than the single shot (see the right hand image for comparison). One thing stands out, I have a major hot pixel problem. This is probably exacerbated by the fact it was blinking hot last night, so the hot pixels showed up more. So I really need a dark frame. I should do this again with a) a drak frame, b) a cool camera c) using real stacking software. (any other hints gratefully accepted)
Friday, January 20, 2006
On the Way to Pluto!
On the Way to Pluto!
Wednesday, January 18, 2006
Orion in Summer
Not Pluto Bound (Yet)
Tuesday, January 17, 2006
The Space probe New Horizons will blast off for Pluto and the Kupier belt at 5:43 am AEDST(about 18:24 UT). If you are up that early, try to check out NASA TV's webcast. Despite problems with a fuel cylinder, all appears go at the moment. You can see a Webcast of the prelaunch briefing here, and an article on the probe is here on ABC science. Other views can be seen at the Bad Astronomer, Stuart and Toms Astroblog.
Monday, January 16, 2006
Stardust has arrived in the NASA cleanroom, you can listen to the podcast here. Apparently the aerogel with the samples will be removed on Tuesday (Wedensday Aust time). The Bad Astronomer has some nice details and pictures. Tom and Stuart have some nice follow up as well.
Sunday, January 15, 2006
Stardust Returns (3)
9:48 ACDST. Two helicopters have landed, one is circling, the recovery crew is heading out.
10:15 ACDST. The capsule has been loaded onto a helicopter and is heading back to the clean room. This will be the start of a long process to idenrtify and extract the cometary dust particles.
11:08 ACDST. The capsule hs been returned safe and sound. I am now off to bed.
Pop in to the bad astronomer as well as Tom and Stuart, and check out this image of the Stardust spacecraft captured by astronomy students.
Stardust returns (2)
Stardust Returns (1)
Where is Venus now?
Venus has left the evening skies, and I shall miss its bright beacon, a companion to me on my walk home from work. Venus will soon appear as the Morning star, and will accompany my morning cuppas, so I'm not distraught.
At the moment though, Venus is too close to the Sun for human eyes to see, but it is the field of view of SOHO's Lasco C3 camera. The image above shows Venus near the top (the bright object with the line through it, the line is an artifact). The bright object to the bottom right is Mercury. A larger image can bee seen here. A great movie showing Venus and Mercury approaching the Sun, to the accompaniment of billowing gusts of solar matter is here (288K MPG) or high resolution here (1.8M MPG).
Venus was at inferior conjunction on Saturday the 14th (ie almost directly in line with us and the Sun. Last Year Venus transited the Sun, but it will be a while (2012) before Venus transits again, and over a century until the one after that. However, this year we will be treated to a Transit of Mercury (November 9).
Friday, January 13, 2006
It was a warm and balmy night, the boys and I swam under the stars until late, Orion arching over us, then I set up the scope. Of course, warm and balmy means, you guessed it, turblulence, in spades. The Moon looked like it was under running water. Then we got invaded by thin high cloud, in fact there is a lovely Moon bow around the Moon at this moment.
So my first Saturn shot is well, pretty awful. The shot is a 2 second AVI, 15 frames per secomd, processed in Registax with about 1/3 of the frames tossed out. Well, you can at least see rings, and m-a-y-b-e the shadow on the rings. Maybe the air will be more stable near opposition, but as this is the hottest time of the year, I doubt it.
Thursday, January 12, 2006
Anyway, I've written up some astro-highlights from my Christmas trip, and I'll share them with you over the next few days. This very un astronomical image is from the very start of the trip. In a paddock in the middle of nowhere (on a farmstay where we overnighted) all the fence posts were crowned with snails. Why? Is it some mass snail suicide pact? A free snail cafeteria for passing birds? The surrounding paddocks where dry (there was a dam at one end, but this was pretty far form the dam). Any ideas?
Global Warming Idiocy
An article that starts off citing Science Fiction writer Michael Crichton's, as this one does, does not inspire confidence. Mr Crichton has written a Science Fiction thriller about climate change. Despite numerous factual errors, many people see him as an authority rather than people who actually study climate. You should visit RealClimate to find out the real issues in global warming rather than Crichton inspired fantasies.
The Australian article in question trots out a wide range of "facts" about global warming that have been long debunked.
Hence, the famous "hockey stick" graph purporting to show climate over the past 1000 years, as a continuous, flat, millennium-long bungalow with a skyscraper tacked on for the 20th century. This graph was almost laughably fraudulent, not least because it used a formula that would generate a hockey stick shape no matter what data you input, even completely random, trendless, arbitrary computer-generated data.
No, the "Hockey Stick" is not fraudulent. This discussion of the "Hockey Stick" goes into much better detail about it (actually, it gets a bit technical), but the take home message is that the results are well validated, reproducible in other studies and most importantly, the statistical treatment (it wasn't a "mathematical formula as most lay people would understand) did not automatically generate "hockey sticks" (It was principle component analysis for crying out loud). See also this discussion of "Hockey Stick" myths.
Thirty years ago, Lowell Ponte had a huge bestseller called The Cooling: Has the new ice age already begun? Can we survive?
What climate change denial tract would be complete without the "coming ice age" prediction? This is an Urban Myth , but climate deniers keep on trotting it out.
Because from 1940 to 1970, temperatures fell. Now why would that be? Who knows? Maybe it was Hitler.
Yes, there is a slight cooling phase between 1940 and 1970 (closer to the mid sixties actually) that is superimposed on an otherwise relentless rise since 1900. While climate scientists cannot be certain of all the factors involved, the most likely culprits are aerosols from industrial pollution and volcanic eruptions , that are known to cause cooling.
As a research scientist and amateur astronomer I'm used to highly technical debate in contentious scientific areas. What I am not used to (pace creationism, which is a different kettle of fish) is the use of apparently deliberate mistruths in debate. Newspapers still play an important role in disseminating information, and journalists pride themselves on presenting both sides of a debate fairly. However, The Australian has given a prominent place to someone who is spouting absolute nonsense. Nonsense that could be checked with a few minutes on the internet (let alone perusing any of the technical papers or the IPCC summaries. As such, The Australian has done a grave disservice to the public of Australia.
Phases of Venus animation
Your name in (microscopic) lights
Wednesday, January 11, 2006
Slithering with Ediacarans
A little while ago I was priveledged to go on a trip with the Distinguished Professor Steve Steve, who posts over at The Panda's Thumb , we went on a trip to the Ediacaran Section of the Museum of South Australia together.
Read more about our trip at www.pandasthumb.org/arc...