Mon Apr 23, 2012 CRESCENT MOON ABOVE JUPITER The moon
... astronomers such as Heber Curtis thought we were at the center of our galaxy, for when you looked along the milky band of stars that defines the galactic disc, you saw roughly the same number of stars throughout. Curtis also thought that spiral nebulae were distant galaxies, like our Milky Way, but ...
... astronomers such as Heber Curtis thought we were at the center of our galaxy, for when you looked along the milky band of stars that defines the galactic disc, you saw roughly the same number of stars throughout. Curtis also thought that spiral nebulae were distant galaxies, like our Milky Way, but ...
What Channel is That?
... and __________ monitored the incoming radio waves. Astronomers then ___________ the data. 11. Today, computers store the same data and false color it to produce ___________ of the radio waves. ...
... and __________ monitored the incoming radio waves. Astronomers then ___________ the data. 11. Today, computers store the same data and false color it to produce ___________ of the radio waves. ...
Modern observing and imaging techniques, with automated goto mounts and... (charge-coupled device) cameras, Introduction
... Dark frames http://en.wikipedia.org/wiki/Dark-frame_subtraction are images taken with the camera’s shutter closed, at the same exposure, temperature, and binning as the light frames. These images record the same noise in the CCD, as the light frames. This noise is then subtracted from each frame for ...
... Dark frames http://en.wikipedia.org/wiki/Dark-frame_subtraction are images taken with the camera’s shutter closed, at the same exposure, temperature, and binning as the light frames. These images record the same noise in the CCD, as the light frames. This noise is then subtracted from each frame for ...
Paper Title - Mees Solar Observatory
... currently proposed systems GREGOR and ATST intend to work at small f-numbers for primary imaging and are based on the Gregorian telescope design. In the interim 2 designs have been built that are bridging the gap to the larger aperture, fast primary systems. The Dutch Open Telescope (DOT) and the SO ...
... currently proposed systems GREGOR and ATST intend to work at small f-numbers for primary imaging and are based on the Gregorian telescope design. In the interim 2 designs have been built that are bridging the gap to the larger aperture, fast primary systems. The Dutch Open Telescope (DOT) and the SO ...
Let`s Observe the Andromeda Nebula (M31)!
... * The power of the telescope can be determined by dividing the focal length of the telescope with the focal length of the eyepiece. * The field of view depends on the telescope and eyepiece, so check the telescope’s manual or the vendor’s web page. ...
... * The power of the telescope can be determined by dividing the focal length of the telescope with the focal length of the eyepiece. * The field of view depends on the telescope and eyepiece, so check the telescope’s manual or the vendor’s web page. ...
Wave: a disturbance which carries energy through a material or
... Brightness of an image depends upon: •Light-gathering power of objective (area A) •Size of image (focal length f ) ~(Diameter/f)2 f-number is the “speed” of a lens or mirror = f/D smaller f-number → more light → shorter exposure ...
... Brightness of an image depends upon: •Light-gathering power of objective (area A) •Size of image (focal length f ) ~(Diameter/f)2 f-number is the “speed” of a lens or mirror = f/D smaller f-number → more light → shorter exposure ...
Unit 28 - Optical Devices
... Remember our spider that was 15cm to the left of a converging lens with a focal length of 20cm? A virtual image was formed 60cm upstream of the lens. (m=4) What if I put a second similar lens 10cm downstream of the first one. ...
... Remember our spider that was 15cm to the left of a converging lens with a focal length of 20cm? A virtual image was formed 60cm upstream of the lens. (m=4) What if I put a second similar lens 10cm downstream of the first one. ...
Optical and infrared astronomical telescopes and instruments (L16)
... Astronomy is an observational science. Our understanding of the universe beyond the Earth comes mostly from interpreting the electromagnetic radiation we see coming from the sky. This course is about the equipment and techniques that we use to collect and measure the optical and near infra-red compo ...
... Astronomy is an observational science. Our understanding of the universe beyond the Earth comes mostly from interpreting the electromagnetic radiation we see coming from the sky. This course is about the equipment and techniques that we use to collect and measure the optical and near infra-red compo ...
Document
... • Focusing of X-rays requires special mirrors • Mirrors are arranged to focus X-ray photons through grazing bounces off the surface ...
... • Focusing of X-rays requires special mirrors • Mirrors are arranged to focus X-ray photons through grazing bounces off the surface ...
ML 5037-40
... this information, we can control the deformable mirror to compensate the system deformation as a closed loop system. We confirmed that the absolute precision of the wave front sensor was less than 3 nm rms. deformable mirror was roughly 5 nm rms. effective diameter of 80mm. ...
... this information, we can control the deformable mirror to compensate the system deformation as a closed loop system. We confirmed that the absolute precision of the wave front sensor was less than 3 nm rms. deformable mirror was roughly 5 nm rms. effective diameter of 80mm. ...
Observing the Solar Spectrum
... get an idea of the proportional breakdown of elements that are present in burning solar masses. Each element is related to a specific wavelength according to its energy. The Sun’s spectrum ranges from 350 nanometers to 950 nanometers. Using this process we can confirm which elements make up the Sun ...
... get an idea of the proportional breakdown of elements that are present in burning solar masses. Each element is related to a specific wavelength according to its energy. The Sun’s spectrum ranges from 350 nanometers to 950 nanometers. Using this process we can confirm which elements make up the Sun ...
Telescopes
... observer is using a telescope to resolve a binary star system where two stars are a separated by 0.4 arcsec. Ignoring the seeing effect of the atmosphere, what is the minimum size of the telescope needed to resolve the binary? Use 0.5 μm for the wavelength. If the seeing is 2 arcsec, what is the sma ...
... observer is using a telescope to resolve a binary star system where two stars are a separated by 0.4 arcsec. Ignoring the seeing effect of the atmosphere, what is the minimum size of the telescope needed to resolve the binary? Use 0.5 μm for the wavelength. If the seeing is 2 arcsec, what is the sma ...
ES11_Ch23_Lecture
... • Refracting telescope • Uses a lens (called the objective) to bend (refract) the light to produce an image • Light converges at an area called the focus • Distance between the lens and the focus is called the focal length • The eyepiece is a second lens used to examine the image directly • Have an ...
... • Refracting telescope • Uses a lens (called the objective) to bend (refract) the light to produce an image • Light converges at an area called the focus • Distance between the lens and the focus is called the focal length • The eyepiece is a second lens used to examine the image directly • Have an ...
Starshade Field Testing
... – Aperture stops (2 cm, 4 cm, and 6 cm) were added after the first test to provide a better match of telescope resolution to starshade angular size • The camera is an electrically cooled CCD with a selectable filter wheel – Included neutral density (ND) filters to allow large dynamic range betwee ...
... – Aperture stops (2 cm, 4 cm, and 6 cm) were added after the first test to provide a better match of telescope resolution to starshade angular size • The camera is an electrically cooled CCD with a selectable filter wheel – Included neutral density (ND) filters to allow large dynamic range betwee ...
Telescopes of the Future
... New telescopes, new detectors and new regions of the electromagnetic spectrum have often revealed totally unsuspected aspects of the universe. Consider the careful spectroscopic observations of nebulae started around 1912 by Vesto Slipher, using the modest 24 in (61 cm) telescope of Lowell observato ...
... New telescopes, new detectors and new regions of the electromagnetic spectrum have often revealed totally unsuspected aspects of the universe. Consider the careful spectroscopic observations of nebulae started around 1912 by Vesto Slipher, using the modest 24 in (61 cm) telescope of Lowell observato ...
11._light__small_telescopes_student
... More efficient, but requires a more complex secondary mirror. (hyperbolic rather than flat) ...
... More efficient, but requires a more complex secondary mirror. (hyperbolic rather than flat) ...
Station #3: Make a Refracting Telescope
... 23 ½ degrees. It takes the Earth 24 hours to make one complete revolution. The Earth is also revolving around the sun. At different times of the year different parts of the Earth’s surface face the sun for longer or for shorter periods of time. Most parts of the world have four such periods or seaso ...
... 23 ½ degrees. It takes the Earth 24 hours to make one complete revolution. The Earth is also revolving around the sun. At different times of the year different parts of the Earth’s surface face the sun for longer or for shorter periods of time. Most parts of the world have four such periods or seaso ...
Astronomy and Space articles by Martin George of the Launceston
... received rather reluctant permission from the Observatory's director, Johann Encke, to spend time on the search. On that Wednesday night, Galle commenced the search with student Heinrich d'Arrest, using a fine refractor telescope. They were looking for an object that was expected to show a small dis ...
... received rather reluctant permission from the Observatory's director, Johann Encke, to spend time on the search. On that Wednesday night, Galle commenced the search with student Heinrich d'Arrest, using a fine refractor telescope. They were looking for an object that was expected to show a small dis ...
Optical Variability of BL Lac Object OJ 287
... A subset of AGNs; Rapid and strong variation without evident period; High polarization, highly variable; Power-law optical continuum; Radio-loud, flat-spectrum; Superluminal motion. ...
... A subset of AGNs; Rapid and strong variation without evident period; High polarization, highly variable; Power-law optical continuum; Radio-loud, flat-spectrum; Superluminal motion. ...
New Developments of Scintillating Crystal
... precision and offer additional improvements in performance over standard large photomultiplier tubes. Improved overall detection efficiency is possible through the more efficient electrostatic collection of photoelectrons emitted from the photocathode, which also makes X-HPDs insensitive to the Eart ...
... precision and offer additional improvements in performance over standard large photomultiplier tubes. Improved overall detection efficiency is possible through the more efficient electrostatic collection of photoelectrons emitted from the photocathode, which also makes X-HPDs insensitive to the Eart ...
Document
... Typical values of r0 • Usually r0 is given at a 0.5 micron wavelength for reference purposes. It’s up to you to scale it by l-1.2 to evaluate r0 at your favorite wavelength. • At excellent sites such as Paranal, r0 at 0.5 micron is 10 - 30 cm. But there is a big range from night to night, and at ti ...
... Typical values of r0 • Usually r0 is given at a 0.5 micron wavelength for reference purposes. It’s up to you to scale it by l-1.2 to evaluate r0 at your favorite wavelength. • At excellent sites such as Paranal, r0 at 0.5 micron is 10 - 30 cm. But there is a big range from night to night, and at ti ...
The 1.5 meter solar telescope GREGOR
... 2007). Swirling motions were recently found in the photosphere and also in the chromosphere. They may be another mechanism to transport energy from the solar surface to higher layers of the solar atmosphere (Wedemeyer-Böhm et al. 2012). The time scales of chromospheric dynamics are short, the magne ...
... 2007). Swirling motions were recently found in the photosphere and also in the chromosphere. They may be another mechanism to transport energy from the solar surface to higher layers of the solar atmosphere (Wedemeyer-Böhm et al. 2012). The time scales of chromospheric dynamics are short, the magne ...
Measuring the size of small things Stellar Diameters Atmospheric Cherenkov Telescopes
... 32 stars measured from Narrabri magnitudes < 2.5 0.41mas < diameters < 3.24mas 10 of them in the main sequence ...
... 32 stars measured from Narrabri magnitudes < 2.5 0.41mas < diameters < 3.24mas 10 of them in the main sequence ...