When you want to see the stars, find someplace dark
After years of a nearly blank solar disk, we have a beautifully active Sun. Any time you have a chance to see the Sun through a telescope this year, do so. The view is replete with sunspots, or if you have a Hα filter, prominences and more…
Stars in the night sky
Keck Observatory sees
When was the Big Bang?
– Barbara Russell
Thanks to the work of a lot of astronomers and observatories, including Keck, we can answer that one… The Big Bang was 13.75 ±0.11 billion years ago.
Modern astronomy has allowed us to answer questions that have been asked for as long as curious humans have looked at the universe around us. Curiosity as expressed in a poem is part of what we are as humans. That is why we build and maintain the big telescopes. Thanks Barbara!
First up? just setup the ‘scope in the driveway and take a few photos of the Sun. Just checking the photographic setup, the necessary parts and pieces. Nothing misplaced? Where did I store the solar filter? A nice focus on the camera? Perhaps take some nice photos of the large sunspots that current grace the surface of the Sun while I am set up. I hope we have some nice spots during the transit, they make focusing so much easier!
Next step is to get autoguiding operational, this will be a seven hour event and I really do not want to manually guide for the entire duration. Particularly with a telescope that was setup in the daytime and is not properly polar aligned.
A couple other steps remain in the preparation. Automate the camera to take photos at a regular interval. Insure I can provide a good video feed to the computer sending out the webcast. I do have a few more weeks to accomplish this. I am certain those weeks with speed by surprisingly quickly. Time to get ready!
Today, Jupiter will pass through superior conjunction at 02:46HST. The planet will remain lost in the Sun’s glare for the remainder of the month, appearing in the dawn during the first days of June. The planet will arrive at opposition on December 2nd.
Throughout June, Jupiter will climb higher in the dawn. Towards the end of June the planet Venus will emerge from the Sun’s glare to race after Jupiter. The two will meetup for a brilliant morning conjunction during the first week of July.
This week Mercury will be exiting the dawn sky, sliding closer to the Sun in our sky each day. It will pass through superior conjunction on May 27th, heading for an evening apparition beginning in the first days of June.
A telescope needs to move smoothly, without any binding or sticking. The elegantly simple bearing design used in dobsonian telescopes uses a smooth surface riding on a small pad of some low friction material. This requires a pad of some material that slides smoothly and does not stick, to provide the motion. The standard answer of telescope builders is polytetrafluoroethylene, simply referred to by the acronym PTFE or the trade name Teflon.
The price is excellent for an 8-inch telescope, but there is some sign of cost cutting in the more recent versions. One interesting difference I found in this ‘scope was the bearing material. The bearing pads that are supplied do not appear to be PTFE, but instead a much harder material, possibly HDPE instead, which would be cheaper than PTFE. replacing these with PTFE results in a nice improvement in the smoothness and ease of movement of the telescope.
This particular telescope was missing two bearing pads, so some replacement was required, whatever the material. Without access to the original parts it was necessary to obtain whatever material was available, and that would be PTFE. Since it came in a different thickness than the original bearing it was also necessary to replace all four pads.
In place of the original staples, a small flat head screw is used to secure the Teflon in place. The soft material is easy to work. As long as the tools are sharp drilling and countersinking the pieces is easy. Best use a new drill bit if you have one, or grab one of the odd sizes that never seem to be used.
Position of the bearing around the radius of the trunnion have some impact into how easily the telescope will move. Positioned closer together and closer to the bottom of the bearing and the telescope will move more easily. Positions further part and higher on the bearing sides will result in more friction as the trunnion presses outwards against the pads.
The repair worked quite nicely, with a ‘scope that move smoothly across the sky. A bit more cleaning and a few minutes collimating the optics had the small telescope again ready for the sky.
On Thursday, May 10, 2012, Keck Observatory hosted a live webcast of an astronomy talk by Dr. Brian Siana of the University of California at Riverside. Below is the recording of that talk, which was delivered to a live audience at the Kahilu Theatre in Kamuela-Waimea, Hawaii.
The first galaxies had an extraordinary impact on the young universe. Their ultraviolet light destroyed nearly all of the atoms in the cosmos. This process, called reionization, had severe consequences for galaxies trying to form thereafter. Unfortunately, we have no idea how it happened. In galaxies today ultraviolet light cannot escape, so the first galaxies must have been very different from those we see today. Dr. Siana will describe the quest to detect these first galaxies and their impact on the early universe.
You remember haiku? Three lines, the first line with five syllables, a second line with seven syllables, and a last line with five syllables. It may be poetry, but this is easy poetry to write, a short verse with an elegant cadence.
For an AstroDay activity, Keck held an astronomy haiku project. We have a stack of entries we are just now getting a chance to read. Winners are not yet decided, but I have found a few that are wonderful, and worth giving some recognition to.
I should be clear, these are my favorites! Not necessarily the contest winners.
Telescopes are great
They make you see very far
I love telescopes
-Madison Kobayashi (age 9)
Stars shining brightly
I look to them for comfort
In them I find you
-Lacey Siweila
Lacey is over 18 and not eligible for a prize in the contest. She knew this and enters a poem anyway. You have to love that!
The Moon is so bright
The stars help light up the night
Let’s lay out tonight
– Micah Timbresa (age 7)
All poems reproduced with permission.
I have had a problem observing here in Hawai’i. The skies can be gorgeous, there is little to no light pollution, and you have access to much more of the southern sky. What could go wrong? …Dew!
I had one dew strap available, given to me by a friend and fellow observer, a small one just right for wrapping around an eyepiece. So I just needed a controller to get started. There are several of these available on the market. But I had some issue with the cost, it seemed a bit high for what was essentially a very simple device. Some of the commercial units offered features like temperature sensing and regulation. Simple overkill for most users actual needs, just warm the optic slightly until the dew goes away. Sounds like an excuse for another evening project to me… Build it!
Tonight’s Keck lecture looks to be an interesting one, discussing the very early ages of the universe in the few million years immediately after the Big Bang. I will be there, I hope you can be there as well.
Dr. Brian Siana
How Stars Destroyed Most of the Atoms in the Universe
Kahilu Theater
Thursday, May 10th
7:00pm
Of course we will be web-casting the lecture live for those unable to attend…