THE DEMOGRAPHICS OF LONG-PERIOD COMETS ABSTRACT
... Secondly, some comets might have been inactive at these large heliocentric distances, and hence classified as minor planets. The minor planet centre database was checked for non-cometary objects on long-period, highly eccentric orbits, but only one was found which reached perihelion within the period ...
... Secondly, some comets might have been inactive at these large heliocentric distances, and hence classified as minor planets. The minor planet centre database was checked for non-cometary objects on long-period, highly eccentric orbits, but only one was found which reached perihelion within the period ...
The CCD Photometric Calibration Cookbook
... and details are deliberately omitted for clarity and brevity. However, references to additional details are given throughout and the next section gives some useful general references. In summary, the cookbook will not turn you into an expert in astronomical photometry, but it does give recipes which ...
... and details are deliberately omitted for clarity and brevity. However, references to additional details are given throughout and the next section gives some useful general references. In summary, the cookbook will not turn you into an expert in astronomical photometry, but it does give recipes which ...
here
... 5/1 May Day or Beltane, a cross-quarter day; Mars (heliocentric longitude 83.1 degrees) and Saturn (heliocentric longitude 263.1 degrees) are at heliocentric opposition at 7:00; the Moon is 9.7 degrees south of the first-magnitude star Pollux (Beta Geminorum) at 18:00 5/2 Mercury is stationary in ri ...
... 5/1 May Day or Beltane, a cross-quarter day; Mars (heliocentric longitude 83.1 degrees) and Saturn (heliocentric longitude 263.1 degrees) are at heliocentric opposition at 7:00; the Moon is 9.7 degrees south of the first-magnitude star Pollux (Beta Geminorum) at 18:00 5/2 Mercury is stationary in ri ...
Modeling, Simulation, and Characterization of Space Debris in low
... radiometric, and thermal models for the study of space debris in low-Earth orbit have been developed. This modeled approach proposes analysis methods that provide increased Local Area Awareness for satellites in low-Earth and geostationary orbit. Local Area Awareness is defined as the ability to det ...
... radiometric, and thermal models for the study of space debris in low-Earth orbit have been developed. This modeled approach proposes analysis methods that provide increased Local Area Awareness for satellites in low-Earth and geostationary orbit. Local Area Awareness is defined as the ability to det ...
T3-Cosmic Star Formation History
... The origin and evolution of galaxies are among the most intriguing and complex chapters in the formation of cosmic structure, and observations in this field have accumulated at an astonishing pace. Multiwavelength imaging surveys with the Hubble (HST) and Spitzer space telescopes and ground-based fac ...
... The origin and evolution of galaxies are among the most intriguing and complex chapters in the formation of cosmic structure, and observations in this field have accumulated at an astonishing pace. Multiwavelength imaging surveys with the Hubble (HST) and Spitzer space telescopes and ground-based fac ...
Star Formation in the Milky Way and Nearby Galaxies Further
... reviews have covered various observational aspects of star formation within the MW (Evans 1999, Bergin & Tafalla 2007, Zinnecker & Yorke 2007), but the most comprehensive reviews have been theoretically based (Shu, Adams & Lizano 1987; McKee & Ostriker 2007). We here take an observational perspectiv ...
... reviews have covered various observational aspects of star formation within the MW (Evans 1999, Bergin & Tafalla 2007, Zinnecker & Yorke 2007), but the most comprehensive reviews have been theoretically based (Shu, Adams & Lizano 1987; McKee & Ostriker 2007). We here take an observational perspectiv ...
astronomical dating of edvard munch`s - Digital Collections
... southwest, exactly the direction where the Krakatoa twilights appeared when at their most spectacular during the winter following the eruption.1 On that same trip Dr. Olson’s group found the site of Munch’s Girls on the Pier in Åsgårdstrand. They determined the artist’s direction of view and showed ...
... southwest, exactly the direction where the Krakatoa twilights appeared when at their most spectacular during the winter following the eruption.1 On that same trip Dr. Olson’s group found the site of Munch’s Girls on the Pier in Åsgårdstrand. They determined the artist’s direction of view and showed ...
Giant star seismology
... between cycle 23 and 24 are still subject of discussion (Basu et al, 2012; Basu, 2013; Jiang et al, 2015). Furthermore, oscillations sensitive to the activity suggest the presence of a 2-yr cycle in addition to the 11-yr cycle (Broomhall et al, 2012) which is yet to be understood. The road to the de ...
... between cycle 23 and 24 are still subject of discussion (Basu et al, 2012; Basu, 2013; Jiang et al, 2015). Furthermore, oscillations sensitive to the activity suggest the presence of a 2-yr cycle in addition to the 11-yr cycle (Broomhall et al, 2012) which is yet to be understood. The road to the de ...
Brochure - Institut für Raumfahrtsysteme
... 1. Activities of the Cosmic Dust Group The Dust Research Group at the University of Stuttgart (formerly located at the Max-Planck-Institute for Nuclear Physics in Heidelberg) investigates cosmic dust phenomena via in situ measurements in space, by experiments in the laboratory and theoretical studi ...
... 1. Activities of the Cosmic Dust Group The Dust Research Group at the University of Stuttgart (formerly located at the Max-Planck-Institute for Nuclear Physics in Heidelberg) investigates cosmic dust phenomena via in situ measurements in space, by experiments in the laboratory and theoretical studi ...
Chemical composition of B-type supergiants in the OB8, OB10
... reduced spectra were always in excess of 200 for these bright comparison stars. The CCD frames were reduced to wavelength calibrated spectra using the IRAF reduction system1 . Standard procedures were used to bias correct and flat field the stellar images. As our targets are in young clusters, there ...
... reduced spectra were always in excess of 200 for these bright comparison stars. The CCD frames were reduced to wavelength calibrated spectra using the IRAF reduction system1 . Standard procedures were used to bias correct and flat field the stellar images. As our targets are in young clusters, there ...
Article PDF - IOPscience
... mag) with distinct light curves, which makes them easy to identify with time-domain imaging surveys, even to large distances (5–120 kpc for surveys with a 14 < V < 21 magnitude range; e.g., Sesar et al. 2010). These properties, and the fact that almost every Milky Way dwarf satellite galaxy has at l ...
... mag) with distinct light curves, which makes them easy to identify with time-domain imaging surveys, even to large distances (5–120 kpc for surveys with a 14 < V < 21 magnitude range; e.g., Sesar et al. 2010). These properties, and the fact that almost every Milky Way dwarf satellite galaxy has at l ...
Astronomy Astrophysics Excitation of solar-like oscillations across the HR diagram &
... Kjeldsen 2003). Theoretical calculations result in an overestimation of their amplitudes (see Kjeldsen & Bedding 2001; Houdek & Gough 2002). For instance, using Gough’s (1976, 1977) nonlocal and time dependent treatment of convection, Houdek et al. (1999) have calculated expected values of Vmax , th ...
... Kjeldsen 2003). Theoretical calculations result in an overestimation of their amplitudes (see Kjeldsen & Bedding 2001; Houdek & Gough 2002). For instance, using Gough’s (1976, 1977) nonlocal and time dependent treatment of convection, Houdek et al. (1999) have calculated expected values of Vmax , th ...
8th Grade Science
... At the center of an atom is the nucleus (plural, nuclei). The nucleus contains most of the atom’s mass. However, in size, it’s just a tiny part of the atom. The model in Figure above is not to scale. If an atom were the size of a football stadium, the nucleus would be only about the size of a pea. T ...
... At the center of an atom is the nucleus (plural, nuclei). The nucleus contains most of the atom’s mass. However, in size, it’s just a tiny part of the atom. The model in Figure above is not to scale. If an atom were the size of a football stadium, the nucleus would be only about the size of a pea. T ...
Preliminary Talk Abstract Book - MoCA
... Clusters of galaxies are the most massive virialised cosmic structures. The diversity of their environmental conditions, from the dense cores to the sparse outskirts, allows them to be used as observational laboratories for the study of the environmental drivers of galaxy evolution. Furthermore, the ...
... Clusters of galaxies are the most massive virialised cosmic structures. The diversity of their environmental conditions, from the dense cores to the sparse outskirts, allows them to be used as observational laboratories for the study of the environmental drivers of galaxy evolution. Furthermore, the ...
Chandra Characterization of X-ray Emission in the Young F
... The total program observing time was 39 ksec, and the total on-target observing time was 37.3 ksec, in which 1509 total raw photons were detected using a source extraction radius of 20ʺ and an energy filter in the range 0.3-2.0 keV. The extraction region was centered halfway between the two resolved ...
... The total program observing time was 39 ksec, and the total on-target observing time was 37.3 ksec, in which 1509 total raw photons were detected using a source extraction radius of 20ʺ and an energy filter in the range 0.3-2.0 keV. The extraction region was centered halfway between the two resolved ...
Open clusters and associations in the Gaia era
... and are most probably bound have an age that is larger than their crossing time tcr , they suggest to use the ratio π = age/tcr as a proxy to distinguish between clusters (π > 1) and associations (π < 1). However the π value is only indicative for regions younger than 10Myr and the distinction is no ...
... and are most probably bound have an age that is larger than their crossing time tcr , they suggest to use the ratio π = age/tcr as a proxy to distinguish between clusters (π > 1) and associations (π < 1). However the π value is only indicative for regions younger than 10Myr and the distinction is no ...
The old globular cluster system of the dIrr galaxy NGC 1427A in the
... of the bright, well-exposed stars were not affected. This was confirmed by the comparison between magnitudes of stars measured in the subtracted and non-subtracted images (see below). The filtered images in each pass-band were subtracted from the original ones, and the resulting images then were use ...
... of the bright, well-exposed stars were not affected. This was confirmed by the comparison between magnitudes of stars measured in the subtracted and non-subtracted images (see below). The filtered images in each pass-band were subtracted from the original ones, and the resulting images then were use ...
Evolution of the Milky Way with radial motions of stars and gas
... term “disk” for the region outside 2 kpc). The current virial mass of the DM halo of the MW is typically estimated to MDH = 1012 M , although variations by a factor greater than two around that value are found in the literature, e.g. Rashkov et al. (2013) and references therein. For the evolution o ...
... term “disk” for the region outside 2 kpc). The current virial mass of the DM halo of the MW is typically estimated to MDH = 1012 M , although variations by a factor greater than two around that value are found in the literature, e.g. Rashkov et al. (2013) and references therein. For the evolution o ...
Final Stages of Stellar Evolution - supernovae and the synthesis of
... extraordinarily stable rotation → astronomical clocks measurement of gravitational waves ...
... extraordinarily stable rotation → astronomical clocks measurement of gravitational waves ...
the mystery of the tunguska fireball
... was rung up by several people, who believed a big fire was raging in the north of London.’ At Edinburgh Observatory the night sky was noted as being very striking, ‘practically daylight’. This practical daylight, The Scotsman reported, caused shadows to be ...
... was rung up by several people, who believed a big fire was raging in the north of London.’ At Edinburgh Observatory the night sky was noted as being very striking, ‘practically daylight’. This practical daylight, The Scotsman reported, caused shadows to be ...