![Elements of astronomy](http://s1.studyres.com/store/data/015978227_1-a8a295b24aa339046d48577262a5c0e3-300x300.png)
Elements of astronomy
... the centre of the field of view, and let the clock-work be connected with it so as to give it a perfectly uniform motion of rotation from east to west. The star will follow the telescope, and the velocity of motion may be so adjusted that the star shall remain in the centre of the field of view from ...
... the centre of the field of view, and let the clock-work be connected with it so as to give it a perfectly uniform motion of rotation from east to west. The star will follow the telescope, and the velocity of motion may be so adjusted that the star shall remain in the centre of the field of view from ...
Keck Adaptive Optics Note - Caltech Optical Observatories
... A list of all the NGAO-related KAON’s produced through the system design phase can be found in Appendix A or at http://www.oir.caltech.edu/twiki_oir/bin/view/Keck/NGAO/NewKAONs. This web page is located within a TWiki shared website (http://www.oir.caltech.edu/twiki_oir/bin/view.cgi/Keck/NGAO/WebHom ...
... A list of all the NGAO-related KAON’s produced through the system design phase can be found in Appendix A or at http://www.oir.caltech.edu/twiki_oir/bin/view/Keck/NGAO/NewKAONs. This web page is located within a TWiki shared website (http://www.oir.caltech.edu/twiki_oir/bin/view.cgi/Keck/NGAO/WebHom ...
83-98
... the colour excesses using UBV photometry showed large systematic differences between various estimates that depended on the periods and also on the amount of reddening. We now know that the broadband photometric systems like UBV are not suitable for the colour-excess determination because the derive ...
... the colour excesses using UBV photometry showed large systematic differences between various estimates that depended on the periods and also on the amount of reddening. We now know that the broadband photometric systems like UBV are not suitable for the colour-excess determination because the derive ...
as PDF - Minnesota Academy of Science
... the right, with ten streamel'8, is a naked-eye view of the same comet, made also by Professor Bond, October 10, following. The drawing below on the right (3) represents the comet as seen five days earlier, while its head W88 passing the bright star, Arcturus, which we, have chosen al! the reference ...
... the right, with ten streamel'8, is a naked-eye view of the same comet, made also by Professor Bond, October 10, following. The drawing below on the right (3) represents the comet as seen five days earlier, while its head W88 passing the bright star, Arcturus, which we, have chosen al! the reference ...
2 Statistical properties of a sample of periodically variable B-type supergiants
... One of the most successful space missions of the European Space Agency (ESA) was HIPPARCOS, launched in 1989. Its prime goal was to measure the distances of 120 000 stars in the solar neighbourhood with unprecedented precision of 2 milli-arcsecond for the parallax. This was achieved by measuring eac ...
... One of the most successful space missions of the European Space Agency (ESA) was HIPPARCOS, launched in 1989. Its prime goal was to measure the distances of 120 000 stars in the solar neighbourhood with unprecedented precision of 2 milli-arcsecond for the parallax. This was achieved by measuring eac ...
– 1 – 1. Emission Lines in Nearby Galaxies 1.1.
... all forbidden lines, which means they have low transition probabilities. When the 4363 Å line is too weak to be detected, one can use strong-line ratios as first laid out by Pagel et al (1979). R23 = ([OII]3727 + [OIII]4959, 5007)/Hβ is the most common such ratio. The problem is that R23 is not mon ...
... all forbidden lines, which means they have low transition probabilities. When the 4363 Å line is too weak to be detected, one can use strong-line ratios as first laid out by Pagel et al (1979). R23 = ([OII]3727 + [OIII]4959, 5007)/Hβ is the most common such ratio. The problem is that R23 is not mon ...
PhD thesis - Hamburger Sternwarte
... period is changing. One explanation for this change is the differential rotation and spot migration as observed for the Sun in form of the butterfly diagrams. In order to measure a rotation period or an activity cycle, it is necessary to monitor a star about a long time. The Hamburg Robotic Telescop ...
... period is changing. One explanation for this change is the differential rotation and spot migration as observed for the Sun in form of the butterfly diagrams. In order to measure a rotation period or an activity cycle, it is necessary to monitor a star about a long time. The Hamburg Robotic Telescop ...
Untitled - NMSU Astronomy
... from the Earth to the Moon is 384,000,000 meters or 384,000 kilometers (km). The distances found in astronomy are usually so large that we have to switch to a unit of measurement that is much larger than the meter, or even the kilometer. In and around the solar system, astronomers use “Astronomical ...
... from the Earth to the Moon is 384,000,000 meters or 384,000 kilometers (km). The distances found in astronomy are usually so large that we have to switch to a unit of measurement that is much larger than the meter, or even the kilometer. In and around the solar system, astronomers use “Astronomical ...
Document
... • Relatively young 394-ms pulsar in 4.7-h binary orbit (Kaspi et al. 2000) • From timing, companion mass 0.99 +/- 0.02 Msun: white dwarf (Bailes et al. 2003) • Relativistic precession of periastron observed • Expected rate of geodetic precession 1.36 deg/yr - precession period 265 yr • Dramatic evol ...
... • Relatively young 394-ms pulsar in 4.7-h binary orbit (Kaspi et al. 2000) • From timing, companion mass 0.99 +/- 0.02 Msun: white dwarf (Bailes et al. 2003) • Relativistic precession of periastron observed • Expected rate of geodetic precession 1.36 deg/yr - precession period 265 yr • Dramatic evol ...
STELLAR AGE VERSUS MASS OF EARLY
... performed visually by allowing age steps of 0.05 dex. The age range was then kept fixed for the other colors (middle and bottom panel). We see from the top panel of Fig. 2 that the SSP of HPL07 exceeds the observed color range at intermediate ages. This is no surprise, though: since the reddest colo ...
... performed visually by allowing age steps of 0.05 dex. The age range was then kept fixed for the other colors (middle and bottom panel). We see from the top panel of Fig. 2 that the SSP of HPL07 exceeds the observed color range at intermediate ages. This is no surprise, though: since the reddest colo ...
ALMA How does it work and how to use it
... databases for molecular and atomic lines. Many spectral lines are listed in it, so it is a very useful tool in planning observations for ALMA. • http://www.splatalogue.net ...
... databases for molecular and atomic lines. Many spectral lines are listed in it, so it is a very useful tool in planning observations for ALMA. • http://www.splatalogue.net ...
Jupiter Press Kit - New Horizons - The Johns Hopkins University
... Just a year after it was dispatched on the first mission to Pluto and the Kuiper Belt, NASA’s New Horizons spacecraft is on the doorstep of the solar system’s largest planet — about to swing past Jupiter and pick up even more speed on its voyage toward the unexplored regions of the planetary fronti ...
... Just a year after it was dispatched on the first mission to Pluto and the Kuiper Belt, NASA’s New Horizons spacecraft is on the doorstep of the solar system’s largest planet — about to swing past Jupiter and pick up even more speed on its voyage toward the unexplored regions of the planetary fronti ...
PDF
... The first announcement was of six new extrasolar planets, five of which were the first discovered via transit observations from the Kepler space telescope and then verified and studied in depth with precision radial velocities from the Keck I telescope and its High Resolution Echelle Spectrometer (H ...
... The first announcement was of six new extrasolar planets, five of which were the first discovered via transit observations from the Kepler space telescope and then verified and studied in depth with precision radial velocities from the Keck I telescope and its High Resolution Echelle Spectrometer (H ...
Period analysis of variable stars by robust smoothing
... SuperSmoother and cosine method, the middle panel illustrates the fits using a smoothing spline and robust smoothing spline regression, and the bottom panel shows the fits based on two other robust smoothing methods described in Section 3 for comparison. All fitting methods have been used with optim ...
... SuperSmoother and cosine method, the middle panel illustrates the fits using a smoothing spline and robust smoothing spline regression, and the bottom panel shows the fits based on two other robust smoothing methods described in Section 3 for comparison. All fitting methods have been used with optim ...
The low-mass dispersed population around the Lupus clouds
... Hα. It also includes the LiI line at 6708 Å, but unfortunately the combination of resolution and signal-to-noise ratio of our spectra provide only upper limits of no practical significance given the typical equivalent width of this line as measured in similar objects (e.g. Neuhäuser & Comerón 1999 ...
... Hα. It also includes the LiI line at 6708 Å, but unfortunately the combination of resolution and signal-to-noise ratio of our spectra provide only upper limits of no practical significance given the typical equivalent width of this line as measured in similar objects (e.g. Neuhäuser & Comerón 1999 ...
Super-solar Metal Abundances in Two Galaxies at ζ ∼ 3.57
... can only infer an upper limit for Al ii, the expected value can be estimated from other ions with similar ionization potential, from which we conclude that NAl II /NAl III > 10. Some heavy elements (e.g., iron or nickel) can be partly locked up in dust grains, and measured column densities (which ar ...
... can only infer an upper limit for Al ii, the expected value can be estimated from other ions with similar ionization potential, from which we conclude that NAl II /NAl III > 10. Some heavy elements (e.g., iron or nickel) can be partly locked up in dust grains, and measured column densities (which ar ...
148 Jun - British Astronomical Association
... will be at a favourable time in July / August. It seems that it got on the observing list due to star spot features and because its period may be changing. Z Herculis is very near Rasalhague in Ophiuchus. RX Herculis This system is a good binocular object varying from magnitude 7.28 to 7.87 with a p ...
... will be at a favourable time in July / August. It seems that it got on the observing list due to star spot features and because its period may be changing. Z Herculis is very near Rasalhague in Ophiuchus. RX Herculis This system is a good binocular object varying from magnitude 7.28 to 7.87 with a p ...
tut35 Magnitudes
... versus daylight sky’s 6.5 magnitude/arcsecond2 has sufficient contrast to be visible just before sunset or just after sunrise. The full Moon’s size and 3.6 magnitude/arcsecond2 makes for an easy daylight sighting. At greatest elongation, Venus’ magnitude/arcsecond2 is 1.9. The large contrast with th ...
... versus daylight sky’s 6.5 magnitude/arcsecond2 has sufficient contrast to be visible just before sunset or just after sunrise. The full Moon’s size and 3.6 magnitude/arcsecond2 makes for an easy daylight sighting. At greatest elongation, Venus’ magnitude/arcsecond2 is 1.9. The large contrast with th ...
OASI News - the Orwell Astronomical Society, Ipswich
... We are organising a solar eclipse event by kind permission of Isaacs on the Quay, Ipswich on 20th March for the best eclipse visible locally for many years. It will be 85%. As it is a Friday morning, members are advised to get it in their diaries now, especially those who have to book leave from wor ...
... We are organising a solar eclipse event by kind permission of Isaacs on the Quay, Ipswich on 20th March for the best eclipse visible locally for many years. It will be 85%. As it is a Friday morning, members are advised to get it in their diaries now, especially those who have to book leave from wor ...
Module 11.1.1: Galaxies: Morphology and the Hubble Sequence
... basic constituents of the universe, obviously distinct units when you look at the sky. And the reason for that is that they are over-‐dense by a factor of 1,000 relative to the extrapolation of ...
... basic constituents of the universe, obviously distinct units when you look at the sky. And the reason for that is that they are over-‐dense by a factor of 1,000 relative to the extrapolation of ...
Astronomy 10
... Here's a tougher question - how are an astronomical unit and a light-year related to each other? (Hint: How are they both related to the Earth?) What's a galaxy? What do we call the one we live in? Make sure you understand the difference between a galaxy, the solar system, and the universe. (Seeds a ...
... Here's a tougher question - how are an astronomical unit and a light-year related to each other? (Hint: How are they both related to the Earth?) What's a galaxy? What do we call the one we live in? Make sure you understand the difference between a galaxy, the solar system, and the universe. (Seeds a ...
Digital Universe Guide - American Museum of Natural History
... http://www.haydenplanetarium.org/universe/. The User is free to download and/or duplicate verbatim copies of the Atlas provided this license and copyright information accompany the Atlas. Modifying the Atlas The user is free to modify the Atlas by either adding data or altering existing data, provid ...
... http://www.haydenplanetarium.org/universe/. The User is free to download and/or duplicate verbatim copies of the Atlas provided this license and copyright information accompany the Atlas. Modifying the Atlas The user is free to modify the Atlas by either adding data or altering existing data, provid ...
Measuring the Distance to the Sun: Final Report
... weather was very bad in Europe not allowing any astronomical observations (but some nice small talks via e-mail about this nerve-shattering fact and the related bad moods!). For this reason, it was very exciting for us to get images from La Silla - taken especially for us! In the second night the we ...
... weather was very bad in Europe not allowing any astronomical observations (but some nice small talks via e-mail about this nerve-shattering fact and the related bad moods!). For this reason, it was very exciting for us to get images from La Silla - taken especially for us! In the second night the we ...
The ages of pre-main-sequence stars
... the hydrostatic inner regions using the methods normally employed in stellar evolution and so, with appropriate boundary conditions, approximate a forming star. Indeed, this kind of premain-sequence theory can be said to have begun alongside stellar evolution itself with the work of Henyey, Lelevier ...
... the hydrostatic inner regions using the methods normally employed in stellar evolution and so, with appropriate boundary conditions, approximate a forming star. Indeed, this kind of premain-sequence theory can be said to have begun alongside stellar evolution itself with the work of Henyey, Lelevier ...
International Ultraviolet Explorer
![](https://en.wikipedia.org/wiki/Special:FilePath/International_Ultraviolet_Explorer.gif?width=300)
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.