With some more time back at the regular computer, I have had the ability to merge some of the eclipse images together to make a solid HDR image of totality. This is what I call quite the Photoshop workout. This is a merge of 12 images ranging from innermost corona out to the outermost corona that did not wipe out the moon’s dark disk. Some 20 hours went into this. The star to the lower left is Regulus in Leo.
The eclipse was a perfect success! Clear skies prevailed throughout totality, with forest fire smoke and clouds coming in after it was all done. The temperature dropped from 88 to 68F, stunning! The corona was larger than those I had seen before. We had prominences and more. MANY images to deal with and not fast internet, so please be patient while I get these things edited and out there. It might take a while… a week or more. In the meantime, here are a couple of unedited shots.
Casper was most generous: we had an excellent space from which to observe: green grassy fields on to the hill to the east of town. The parking lot lights and grass watering sprinkler systems had been disabled for the day. The medical center even provided a lunch at the end!
The town of Casper, WY is now hopping along. A lot more people are here today. We started out with a visit to the Geology Museum on the southwest side of things. They have an excellent display on geologic time along with representative minerals and fossils from each period/era. They also have their very own T.rex skeleton, a nice surprise. It is being slowly picked out of the encasing rock….
So, there was a lot of good paleontology to enjoy there for sure!
Back into town, the place is swinging. Lots of people wandering about with geeky T-shirts… yes, these are eclipse watchers for sure. The town has closed off the central area for shops to show off their goods, for people to mill about, to have a quick bight to eat/drink, and relax in the summer sun, a hot summer sun, pushing to 90F. The skies today: crystal clear. Absolutely lovely.
All, I am safely here at Casper, Wyoming, right on the line for the eclipse. We DID have rooms in the local motel (YAY!) and have been rambling through town a little to get oriented. The town is divided in a couple of neat ways: the Platt River runs through as does a major train route frequented by the BNSF RR and others. The town has a basic grid layout with a couple of highways to help with faster circumnavigation. It is clear, sunny and hot, and the weather is supposed to stay that way through the eclipse. Restaurants and businesses are all out in full force with eclipse gear: shirts, hats, pins, logos, stickers, drinks. One can not make way through town without seeing some reference or another. Yesterday as we drove into town, there was little in the way of traffic, so I surmise that there will be a LOT of traffic today and tomorrow. In short: ALL is GO for eclipse 2017 here.
Eclipses are exciting whether they be partial, total or annular. On August 21st of this year, the USA will have an awesome opportunity to see a total solar eclipse pass right across the entire country from Oregon to South Carolina. People have already got their hotel rooms reserved, rental cars spoken for, and plane tickets purchased. Wherever you choose to go, you are likely to wonder about capturing this event by camera. Here are some thoughts, in no particular order (but I will try to keep it logical).
Thanks to the fine carpenters at the Academy, we now have our Sloan Digital Sky Survey (SDSS) plate mounted and hanging on my classroom wall. It has been encased in a wooden box filled with ornamental lights, giving it that astronomical view.
Information on the plate itself is rather interesting. This is a plate for the Baryon Oscillation Spectroscopic Survey (BOSS) which has the goal of mapping baryon acoustic oscillations signatures by looking at the spectra of some 1.5 million luminous red galaxies. The survey will help astronomers to place limits on the universe’s expansion rate, and more! The plate here was used to hold optical fibers on the SDSS telescope’s focal plane so that each fiber, attached to a hole on the plate, captures light from just one galaxy. That light is then funneled down the fiber optic path to a spectrograph.
The plate has a bunch of markings on it to help astronomers with the data collection process. Fiber optic bundles are grouped together such than each bundle gets a section of the plate bounded by a black border. Blue circles around the openings correspond to the galaxies locations for which spectra are being collected. The black circles around the holes correspond to guide star locations in the field.
SDSS BOSS Plate 6192/56269
Observed on MJD 56269 (8-December-2012)
Plate center: RA = 7.98654794692993, dec = 16.3795967102051
SDSS BOSS Plate 6192
SDSS BOSS Plate 6192’s field of view as seen by the SDSS
The SDSS then converts all the spectra to plots and measures their z (redshift) values, among other things. One spectra from the many on this plate is below
Students and community members joined the crowd at the observatory on Friday night (10 February) to enjoy the penumbral lunar eclipse that was gracing our skies that evening. The moon made its way above the trees in the east by 6:15pm, a lovely full moon, so bright that it looked like floodlights had illuminated the soccer fields by the observatory. It was cold! The thermometer hovered at 11°F and the wind was calm. As people gathered, there was a pulsing of people headed into the Chart House to stay warm, along with those coming back out to view the eclipse’s progress.
This was our first almost-clear evening in quite a while. The day before was the first “snow day” that the Academy had enjoyed in a long time! The new snowfall, well over 10″ deep, had ben plowed from the paths (THANK YOU to our facilities department!), allowing access to the Chart House and Kurtz Dome housing our 16″ SCT telescope. We also had a camera with zoom lens attached, and a pair of tripod-mounted binoculars for people to enjoy.
As predicted, clouds did start rolling in by 7:30pm. With the eclipse hitting maximum at 7:44pm, we had a good view of it before all was obscured. Two good photos below: One of the moon at maximum eclipse, and one of the moonlight causing a 22° ice halo and moondog. Both taken with a D810a and 300mm lens.
The magnetometer is now installed and running in a test location at the observatory. Both raw data and a continuous plot of data are available online at: http://regulusastro.com/magnetometer/ This URL is likely to change as things become more permanent. At this time, the data correlate well with other magnetometers. We are waiting for a couple of other installations in southern NH to complete before we are able to test thoroughly and make this available for scientific use. Stand by for that! A typical data plot is below for a quiet day. The green stripe along the bottom indicates quiet conditions. As geomagnetic activity increases, the stripe will turn yellow then red when the K index hits 6 or more.
The magnetometer is on a lab bench at this time and running continuously. Typical plots look like the one below from 10-October-2016. Deviations from the 00hour UT moment at the start of the plot are in nT. Time is in UT. Short vertical changes are typically automobiles moving in the area. 10-October was a geomagnetically calm day.
A small CME struck the Earth on 13 October resulting in a G1 level storm and some fabulous aurora for northern latitudes. The Kp index hit 6. The magnetometer detected this storm as can be seen by the plot below.
Getting the plots into Excel: Import the files using space and comma as the delimiters. Create three columns for delta x, y and z. Input an equation that calculates the difference between the current cell and the initial entry (format: =c1-$c$1 which creates an Excel absolute cell reference to c1). Check the data all the way down! There are corruptions in the readout that might be from the serial to USB converter. Graphs will not plot properly unless those errors are removed. Below is what the sheet will look like when you’re ready to plot. Columns D, F, and H are the calculations of “=c2-$c$2”, “=e2-$e$2”, and “=g2-$g$2” respectively.
What goes into the repair of a telescope? A lot of time and technical operations.
Our robotic observatory has a 10″ Ritchey–Chrétien optical system. The system focuses by moving the secondary mirror in and out using a very finely controlled motor assembly. After years of hard work, this little assembly got jammed up solidly. The company that made the telescope has moved onto bigger and better things, namely producing to-order optics. Contacting them resulted in contacting an original engineer (James Olson… yes…) who was willing and able to do repairs on the focuser.
The focuser was removed: an intricate couple of hours removing the secondary mirror, detaching all the electronics for the dew heater and focus motor, and then balancing the telescope, since it had lost a lot of mass from its front end. The focuser assembly was then shipped to James in Arizona.
The focuser was taken apart by James, polished, lubricated, re-assembled, and tested for days before he shipped it back to PEA. Once back at its home, the focuser had to be installed back into the spider (24 bolts), the secondary mirror installed onto the end of the focus assembly (three push bolts and three pull bolts), then the whole thing tested for proper movement. A dozen runs of the focuser later, the electronics and mechanics of the system were AOK and ready for the next phase. The next phase?
Collimation! Having removed everything out on the secondary mirror region, everything was out of alignment. All the optics have to be centered on the optical axis, and aligned perfectly both perpendicularly to the optical axis, and rotationally, as these are a matched pair of mirrors… Sigh. That was a time consuming but worthwhile task. Last night the system was star tested. Success! An image of Altair was used for final touches on collimation, and an image of SS Cygni was used to test scientific data usefulness. SS CYG is now in outburst (huzzah!) and the data are perfect! We have V magnitudes to +/- 0.004. We are back in action!#astronomy #photometry #repairs #observatory #robots#PhillipsExeterAcademy