Slide 1 - project team
... • To test LSST curvature wavefront sensing software • IMACS f/2, SLOAN r filter, 26.5% central obscuration • Piston secondary mirror to get defocused donut images • Nominal setup: 3.5mm image defocus. • Analysis of wavefront was done in real time. • Good agreement in general between system input and ...
... • To test LSST curvature wavefront sensing software • IMACS f/2, SLOAN r filter, 26.5% central obscuration • Piston secondary mirror to get defocused donut images • Nominal setup: 3.5mm image defocus. • Analysis of wavefront was done in real time. • Good agreement in general between system input and ...
Slide 1
... • Data can be formed into image, analyzed spectroscopically, or used to measure intensity • Large telescopes gather much more light, allowing study of very faint sources • Large telescopes also have better resolution ...
... • Data can be formed into image, analyzed spectroscopically, or used to measure intensity • Large telescopes gather much more light, allowing study of very faint sources • Large telescopes also have better resolution ...
Tools of Astronomy
... • Astronomers often have to send their instruments into space to collect the information they seek. This is due to: • (1) Earth’s atmosphere blocking radiation • (2) When radiation is allowed to pass through atmosphere, the images are blurred • (3) To make close-up observations • (4) To obtain sampl ...
... • Astronomers often have to send their instruments into space to collect the information they seek. This is due to: • (1) Earth’s atmosphere blocking radiation • (2) When radiation is allowed to pass through atmosphere, the images are blurred • (3) To make close-up observations • (4) To obtain sampl ...
Telescopes
... – Because the eye is a logarithmic detector Apparent magnitude – usually denoted with m Absolute magnitude – usually denoted with M – Apparent brightness that a star would have if it were placed 10 parsecs away. ...
... – Because the eye is a logarithmic detector Apparent magnitude – usually denoted with m Absolute magnitude – usually denoted with M – Apparent brightness that a star would have if it were placed 10 parsecs away. ...
Long time-series photometry on temperate sites
... This average offset is fed into a PID-loop The PID output is applied to the telescope at f=1/5 Hz. Problems with high wind gusts. Dependency of optimal PID parameters on seeing and guider dead-time, from a telescope model Currently, three PID parameter set per axis are used, ...
... This average offset is fed into a PID-loop The PID output is applied to the telescope at f=1/5 Hz. Problems with high wind gusts. Dependency of optimal PID parameters on seeing and guider dead-time, from a telescope model Currently, three PID parameter set per axis are used, ...
05_LectureOutline
... • Combine information from several widely spread radio telescopes as if they came from a single dish • Resolution will be that of dish whose diameter = ...
... • Combine information from several widely spread radio telescopes as if they came from a single dish • Resolution will be that of dish whose diameter = ...
All I Want for Christmas Are Astronomy Toys!
... Refractors are either achromatic (some color distortion) or apochromatic (very little if any color distortion). Apo refractors use two or three lenses of high quality material to correct for chromatic aberration ...
... Refractors are either achromatic (some color distortion) or apochromatic (very little if any color distortion). Apo refractors use two or three lenses of high quality material to correct for chromatic aberration ...
Earth`s Atmosphere & Telescopes
... Advantages of Reflectors Over Refractors • The glass lens in a refractor must be supported on its edge. (Mirrors in a reflector can be supported from the back) • When glass gets too heavy it may sag causing images to lose focus. (Proper support of mirrors in a reflector prevents this problem) • Len ...
... Advantages of Reflectors Over Refractors • The glass lens in a refractor must be supported on its edge. (Mirrors in a reflector can be supported from the back) • When glass gets too heavy it may sag causing images to lose focus. (Proper support of mirrors in a reflector prevents this problem) • Len ...
File
... What information does a star’s spectrum offer about the star? What type of spectrum is associated with the radiation of most stars? ...
... What information does a star’s spectrum offer about the star? What type of spectrum is associated with the radiation of most stars? ...
Introduction to the Solar System
... What is a planet? • A planet is a large body of rock or gas in space that moves around a star. • A planet DOES NOT produce light of its own. That is why planets almost never twinkle as stars twinkle. • You can see planets in the night sky because of the sun’s light reflecting or bouncing off of the ...
... What is a planet? • A planet is a large body of rock or gas in space that moves around a star. • A planet DOES NOT produce light of its own. That is why planets almost never twinkle as stars twinkle. • You can see planets in the night sky because of the sun’s light reflecting or bouncing off of the ...
Light and Telescopes II
... To protect the sensitive electronic amplifiers from overheating by sunlight. To improve their poor resolving power. To improve their poor magnifying power. ...
... To protect the sensitive electronic amplifiers from overheating by sunlight. To improve their poor resolving power. To improve their poor magnifying power. ...
Lab 10: Refracting Telescopes
... for a lens-based, refractive telescope--an objective (positive power) forms a real image, which in turn is viewed through an eyepiece. The refractive version uses a single positive lens as the objective (or more likely an achromatic doublet to minimize chromatic aberrations). The reflective version ...
... for a lens-based, refractive telescope--an objective (positive power) forms a real image, which in turn is viewed through an eyepiece. The refractive version uses a single positive lens as the objective (or more likely an achromatic doublet to minimize chromatic aberrations). The reflective version ...
Slide 1
... is capable of nearly diffraction-limited resolution. At night, the pupil is larger (up to 7 mm) and the resolution is limited by rod-cell density. ...
... is capable of nearly diffraction-limited resolution. At night, the pupil is larger (up to 7 mm) and the resolution is limited by rod-cell density. ...
Lights, Mirrors, and Lenses
... • A plane mirror is a mirror with a flat reflecting surface. • In a plane mirror, your image looks much the same as it would in a photograph. • Images are the same size, just reversed, facing opposite directions. ...
... • A plane mirror is a mirror with a flat reflecting surface. • In a plane mirror, your image looks much the same as it would in a photograph. • Images are the same size, just reversed, facing opposite directions. ...
Cassegrain Focus Design
... ** “The magnified sky image on the microlens surface must be telecentric in order to avoid pupil image shift on the microlens, which may result in light loss that varies across the field.” ** “Magnification M is independent of the distance between the object (here it is telescope focal plane) and th ...
... ** “The magnified sky image on the microlens surface must be telecentric in order to avoid pupil image shift on the microlens, which may result in light loss that varies across the field.” ** “Magnification M is independent of the distance between the object (here it is telescope focal plane) and th ...
Radio Imaging
... – specialised transfer s/w using UDP – iGrid2002: Tape/Disk 500 Mb/s transfer Man-Ams 24/09/02 – First disk-disk test Jodrell Bank(UK)-Westerbork(NL) 24/10/02 data transferred via SJ4/Geant/SURFnet correlated at JIVE within hours ...
... – specialised transfer s/w using UDP – iGrid2002: Tape/Disk 500 Mb/s transfer Man-Ams 24/09/02 – First disk-disk test Jodrell Bank(UK)-Westerbork(NL) 24/10/02 data transferred via SJ4/Geant/SURFnet correlated at JIVE within hours ...
Observatory, Domes, and Telescopes
... 5. What was the telescope tube made of? What property of that material do you think is most important for the telescope to do its job? 6. Do astronomers “look” through modern research telescopes? Why or why not? 7. Describe tools that astronomers use to record light. Where are they mounted on the te ...
... 5. What was the telescope tube made of? What property of that material do you think is most important for the telescope to do its job? 6. Do astronomers “look” through modern research telescopes? Why or why not? 7. Describe tools that astronomers use to record light. Where are they mounted on the te ...
CHAPTER 3: Light and Telescopes
... Even though light rays from stars spread out in all directions, they must travel over huge interstellar distances to reach the Earth. Therefore, the rays which enter our telescopes are essentially traveling in the same direction, and thus they are considered parallel. If the object we are examining ...
... Even though light rays from stars spread out in all directions, they must travel over huge interstellar distances to reach the Earth. Therefore, the rays which enter our telescopes are essentially traveling in the same direction, and thus they are considered parallel. If the object we are examining ...
Observing
... • We’ll meet at the observatory even if it is cloudy – If the weather is really bad (a foot of snow or something) I’ll send an email changing the meeting place, but otherwise… ...
... • We’ll meet at the observatory even if it is cloudy – If the weather is really bad (a foot of snow or something) I’ll send an email changing the meeting place, but otherwise… ...
scientists can use a few smaller telescopes to take images
... 1. Using ___________, scientists can use a few smaller telescopes to take images with the same resolution as a much larger telescope. A. Satellite telescopes B. Charge-coupled devices (CCDs) C. Interferometry D. Adaptive optics 2. To double the resolving power of a telescope, you must _________. A. ...
... 1. Using ___________, scientists can use a few smaller telescopes to take images with the same resolution as a much larger telescope. A. Satellite telescopes B. Charge-coupled devices (CCDs) C. Interferometry D. Adaptive optics 2. To double the resolving power of a telescope, you must _________. A. ...
Chapter 24: Studying the Stars
... 2. Resolving power – allows for sharp images and fine detail larger lens or mirror = sharper image 3. Magnifying power – ability to make an image larger, depends on ...
... 2. Resolving power – allows for sharp images and fine detail larger lens or mirror = sharper image 3. Magnifying power – ability to make an image larger, depends on ...
Chapter 6 Telescopes: Portals of Discovery How does your eye form
... 1. Light-collecting area: Telescopes with a larger collecting area can gather a greater amount of light in a shorter time. 2. Angular resolution: Telescopes that are larger are capable of taking images with greater detail. ...
... 1. Light-collecting area: Telescopes with a larger collecting area can gather a greater amount of light in a shorter time. 2. Angular resolution: Telescopes that are larger are capable of taking images with greater detail. ...
Compact Telescope for Free Space Communications
... telescopes employ a concave secondary mirror located beyond the focus of the primary mirror. This results in longer tube lengths, as the distance between mirrors is slightly more than the sum of their focal lengths, which is the reason Cassegrain systems are the most common. In addition, Gregorian t ...
... telescopes employ a concave secondary mirror located beyond the focus of the primary mirror. This results in longer tube lengths, as the distance between mirrors is slightly more than the sum of their focal lengths, which is the reason Cassegrain systems are the most common. In addition, Gregorian t ...
Light and Telescopes - University of Redlands
... – Breed fruit flies, (and whatever else biologists do). ...
... – Breed fruit flies, (and whatever else biologists do). ...
Reflecting telescope
A reflecting telescope (also called a reflector) is an optical telescope which uses a single or combination of curved mirrors that reflect light and form an image. The reflecting telescope was invented in the 17th century as an alternative to the refracting telescope which, at that time, was a design that suffered from severe chromatic aberration. Although reflecting telescopes produce other types of optical aberrations, it is a design that allows for very large diameter objectives. Almost all of the major telescopes used in astronomy research are reflectors. Reflecting telescopes come in many design variations and may employ extra optical elements to improve image quality or place the image in a mechanically advantageous position. Since reflecting telescopes use mirrors, the design is sometimes referred to as a ""catoptric"" telescope.