Astronomy
... Early Faint Sun • Sun is 4.6 Gyr old • Should have been much fainter when life arose – Solar evolution models predict this – Roughly 25% less solar energy flux on Earth – Would have caused a 7% temperature drop • Corresponds to ~20 degrees celsius colder ...
... Early Faint Sun • Sun is 4.6 Gyr old • Should have been much fainter when life arose – Solar evolution models predict this – Roughly 25% less solar energy flux on Earth – Would have caused a 7% temperature drop • Corresponds to ~20 degrees celsius colder ...
Observational properties of stars
... detectors are limited in this way, and you also have the problems caused by the atmosphere of the Earth blocking some light, as well as stuff out in space blocking other types of light. So any apparent magnitude that you measure will not give you the full energy output of a star. Of course you could ...
... detectors are limited in this way, and you also have the problems caused by the atmosphere of the Earth blocking some light, as well as stuff out in space blocking other types of light. So any apparent magnitude that you measure will not give you the full energy output of a star. Of course you could ...
LT telescope proposal (2011a)
... as ‘seen’ by CoRoT; the wide span will amplify differences between these colors both form activity features as well as from the significantly different limb-darkening of the star; and z’ on its own should provide a light-curve with a diminished signal of the activity signatures. For the interpretati ...
... as ‘seen’ by CoRoT; the wide span will amplify differences between these colors both form activity features as well as from the significantly different limb-darkening of the star; and z’ on its own should provide a light-curve with a diminished signal of the activity signatures. For the interpretati ...
Spectroscopy (Powerpoint)
... imaging, where we integrate over some finite wavelength range) – Note: In practice, when using CCDs for spectroscopy, one also integrates over finite wavelength ranges – they are just very narrow compared to the wavelength itself: Pixel width Δν << ν ...
... imaging, where we integrate over some finite wavelength range) – Note: In practice, when using CCDs for spectroscopy, one also integrates over finite wavelength ranges – they are just very narrow compared to the wavelength itself: Pixel width Δν << ν ...
Spectroscopy
... imaging, where we integrate over some finite wavelength range) – Note: In practice, when using CCDs for spectroscopy, one also integrates over finite wavelength ranges – they are just very narrow compared to the wavelength itself: Pixel width Δν << ν ...
... imaging, where we integrate over some finite wavelength range) – Note: In practice, when using CCDs for spectroscopy, one also integrates over finite wavelength ranges – they are just very narrow compared to the wavelength itself: Pixel width Δν << ν ...
Laser Ranging
... - when it becomes available- can give us produces an ultrashort pulse with a pulse insight into the many sources of systematic width between 30 and 200 picoseconds (fullerrors in the radiometric (canier phase and width-at-half-maximum) and a single pulse pseudorange) data. The nature of these mea- e ...
... - when it becomes available- can give us produces an ultrashort pulse with a pulse insight into the many sources of systematic width between 30 and 200 picoseconds (fullerrors in the radiometric (canier phase and width-at-half-maximum) and a single pulse pseudorange) data. The nature of these mea- e ...
Mirror Development for the Cherenkov Telescope Array
... focal distance f away from a pointlike light-source and the return image is recorded using CCDs or photodiodes. Using waveband filters or narrowband LEDs, measurements at different wavelengths are possible. Normalizing for the intensity of the light-source, the total directed reflectance into the fo ...
... focal distance f away from a pointlike light-source and the return image is recorded using CCDs or photodiodes. Using waveband filters or narrowband LEDs, measurements at different wavelengths are possible. Normalizing for the intensity of the light-source, the total directed reflectance into the fo ...
Planetary Nebula
... What resemble dainty butterfly wings are actually roiling cauldrons of gas heated to more than 36,000 degrees Fahrenheit. The gas is tearing across space at more than 600,000 miles an hour -- fast enough to travel from Earth to the moon in 24 minutes! A dying star that was once about five times the ...
... What resemble dainty butterfly wings are actually roiling cauldrons of gas heated to more than 36,000 degrees Fahrenheit. The gas is tearing across space at more than 600,000 miles an hour -- fast enough to travel from Earth to the moon in 24 minutes! A dying star that was once about five times the ...
Stars, Galaxies, and the Universe Section 1
... stars. The sun has a diameter of 1,390,000 km. • Most of the stars you can see in the night sky are medium-sized stars. • Many stars also have about the same mass as the sun, however some stars may be more or less massive. ...
... stars. The sun has a diameter of 1,390,000 km. • Most of the stars you can see in the night sky are medium-sized stars. • Many stars also have about the same mass as the sun, however some stars may be more or less massive. ...
The Search for Extrasolar Planets
... iodine-cell spectrographs6, and the Geneva group, using fibre-fed spectrographs7. Those two methods were the major independent technological breakthroughs that enabled precise radial velocities to be measured. Currently, the two techniques of radial-velocity and photometric-transit measurements (see ...
... iodine-cell spectrographs6, and the Geneva group, using fibre-fed spectrographs7. Those two methods were the major independent technological breakthroughs that enabled precise radial velocities to be measured. Currently, the two techniques of radial-velocity and photometric-transit measurements (see ...
Abstracts - Physics of Evolved Stars 2015
... and planetary-nebula stages. AGB stars lose most of their stellar envelope in the form of a gaseous and dusty stellar wind. This wind eventually grows to such high mass-loss rates that the central star becomes entirely enshrouded by a dense, dusty superwind. Before reaching such high massloss rates, ...
... and planetary-nebula stages. AGB stars lose most of their stellar envelope in the form of a gaseous and dusty stellar wind. This wind eventually grows to such high mass-loss rates that the central star becomes entirely enshrouded by a dense, dusty superwind. Before reaching such high massloss rates, ...
PH607lec11-4gal2
... Often low surface brightness, so they are hard to find! Why are dwarf galaxies important?? Majority of galaxies are dwarfs!! There are probably lots of these, in the Local Group there are >30! Dwarf galaxies may be remnants of galaxy formation process: “proto-dwarf” gas clouds came together to form ...
... Often low surface brightness, so they are hard to find! Why are dwarf galaxies important?? Majority of galaxies are dwarfs!! There are probably lots of these, in the Local Group there are >30! Dwarf galaxies may be remnants of galaxy formation process: “proto-dwarf” gas clouds came together to form ...
Bayesian mass and age estimates for transiting exoplanet host stars⋆
... measurements based on the analysis of a planetary transit are usually more precise than surface gravity estimates based on the analysis of a stellar spectrum or the luminosity derived from parallax and flux measurements. The mean stellar density is also more sensitive to the change in radius of a st ...
... measurements based on the analysis of a planetary transit are usually more precise than surface gravity estimates based on the analysis of a stellar spectrum or the luminosity derived from parallax and flux measurements. The mean stellar density is also more sensitive to the change in radius of a st ...
New Almagest - University of Notre Dame
... How could someone ascend into Hell? Riccioli says that the answer to this argument is that Hell is a place defined by comparison to this world on which men13 live and to God’s Heaven; the relationship between Heaven, Hell, and the world of men is not affected by whether Earth moves.14 Riccioli did, h ...
... How could someone ascend into Hell? Riccioli says that the answer to this argument is that Hell is a place defined by comparison to this world on which men13 live and to God’s Heaven; the relationship between Heaven, Hell, and the world of men is not affected by whether Earth moves.14 Riccioli did, h ...
Description of Pictures In the Dome
... The Crab Nebula (catalogue designations M1, NGC 1952, Taurus A) is a supernova remnant and pulsar wind nebula in the constellation of Taurus. The nebula was first observed by John Bevis in 1731, and corresponds to a bright supernova recorded by Chinese and Arab astronomers in 1054. At X-ray and gamm ...
... The Crab Nebula (catalogue designations M1, NGC 1952, Taurus A) is a supernova remnant and pulsar wind nebula in the constellation of Taurus. The nebula was first observed by John Bevis in 1731, and corresponds to a bright supernova recorded by Chinese and Arab astronomers in 1054. At X-ray and gamm ...
VV Cephei Eclipse Campaign 2017/19
... The binary star system VV Cephei is a cool red supergiant star (M2 Iab) with a smaller hot blue companion star (B02V). The primary star of VV Cephei is a massive red supergiant star, with an estimated mass of about 20 solar masses. The two stars in this binary are well-separated and significant mass ...
... The binary star system VV Cephei is a cool red supergiant star (M2 Iab) with a smaller hot blue companion star (B02V). The primary star of VV Cephei is a massive red supergiant star, with an estimated mass of about 20 solar masses. The two stars in this binary are well-separated and significant mass ...
Wide-field CCD imager for the 6.5m MMT telescope
... to guide at the wavelength of observation. With no lter, guide stars can be as faint as R=20.5. At the galactic pole the density of stars is still high enough to give more than a 99.8% chance of nding a guide star in each chip ...
... to guide at the wavelength of observation. With no lter, guide stars can be as faint as R=20.5. At the galactic pole the density of stars is still high enough to give more than a 99.8% chance of nding a guide star in each chip ...
New Worlds Ahead: The Discovery of Exoplanets
... gas giant planets like Jupiter (318 Earth masses, or M⊕ ) and Saturn (95 M⊕ ) are located further away (5 and 10 AU), and finally the icy giants Uranus and Neptune, located even further (20 and 30 AU), are much less massive (14 M⊕ and 17 M⊕ ). Pluto does not fit well in this picture, but in fact it ...
... gas giant planets like Jupiter (318 Earth masses, or M⊕ ) and Saturn (95 M⊕ ) are located further away (5 and 10 AU), and finally the icy giants Uranus and Neptune, located even further (20 and 30 AU), are much less massive (14 M⊕ and 17 M⊕ ). Pluto does not fit well in this picture, but in fact it ...
Kepler Telescope Spots Smallest Exoplanet Yet The Night Sky
... · Look to the right of the gibbous Moon this evening for Procyon, and above the Moon for Pollux and (higher) Castor. The Moon is 1.3 light-seconds from Earth; Procyon, Pollux, and Castor are 11, 34, and 52 light-years in the background, respectively. Saturday, February 23 · At this time of year, the ...
... · Look to the right of the gibbous Moon this evening for Procyon, and above the Moon for Pollux and (higher) Castor. The Moon is 1.3 light-seconds from Earth; Procyon, Pollux, and Castor are 11, 34, and 52 light-years in the background, respectively. Saturday, February 23 · At this time of year, the ...
2013 - Society for Astronomical Sciences
... moon are un-observable from ground-based telescopes at Earth, yet these are expected to occur much more frequently than observed impact flashes. As such, these small impacts are likely to have a significant influence on the flux of lunar dust and other elements (and the changes thereof) observed by ...
... moon are un-observable from ground-based telescopes at Earth, yet these are expected to occur much more frequently than observed impact flashes. As such, these small impacts are likely to have a significant influence on the flux of lunar dust and other elements (and the changes thereof) observed by ...
Level 2 Meteorites, Shooting Stars, and Comets
... There are millions of such particles colliding with the atmosphere every day (I mean day and night). But since you can only see them at night, and you can only look at a small part of the sky at once, when stargazing you can expect to see a shooting star every 10 to 15 minutes. This is on a regular ...
... There are millions of such particles colliding with the atmosphere every day (I mean day and night). But since you can only see them at night, and you can only look at a small part of the sky at once, when stargazing you can expect to see a shooting star every 10 to 15 minutes. This is on a regular ...
the first european asteroid `flyby`
... and the first payload activities. The flyby week was by far the most complicated from a planning point of view, with the final four navigation slots and final three manoeuvre slots. The high accuracy achieved in the navigation and the excellent performance of the spacecraft meant the ground team onl ...
... and the first payload activities. The flyby week was by far the most complicated from a planning point of view, with the final four navigation slots and final three manoeuvre slots. The high accuracy achieved in the navigation and the excellent performance of the spacecraft meant the ground team onl ...
International Ultraviolet Explorer
The International Ultraviolet Explorer (IUE) was an astronomical observatory satellite primarily designed to take ultraviolet spectra. The satellite was a collaborative project between NASA, the UK Science Research Council and the European Space Agency (ESA). The mission was first proposed in early 1964, by a group of scientists in the United Kingdom, and was launched on January 26, 1978 aboard a NASA Delta rocket. The mission lifetime was initially set for 3 years, but in the end it lasted almost 18 years, with the satellite being shut down in 1996. The switch-off occurred for financial reasons, while the telescope was still functioning at near original efficiency.It was the first space observatory to be operated in real time by astronomers who visited the groundstations in the United States and Europe. Astronomers made over 104,000 observations using the IUE, of objects ranging from solar system bodies to distant quasars. Among the significant scientific results from IUE data were the first large scale studies of stellar winds, accurate measurements of the way interstellar dust absorbs light, and measurements of the supernova SN1987A which showed that it defied stellar evolution theories as they then stood. When the mission ended, it was considered the most successful astronomical satellite ever.