IMCCE - Observer pages
... surface, if there is an atmosphere or not. A planet as Jupiter has a strong limb-centre effect due to its atmosphere: the object seems to be spherical. Contrarily, the Moon has a very small limb-centre effect: its seems to be flat. If this effect remains symmetrical it may not affect the position of ...
... surface, if there is an atmosphere or not. A planet as Jupiter has a strong limb-centre effect due to its atmosphere: the object seems to be spherical. Contrarily, the Moon has a very small limb-centre effect: its seems to be flat. If this effect remains symmetrical it may not affect the position of ...
Orbital and Physical Characteristics of Extrasolar Planets Systems
... • The distribution of exoplanet masses increases for decreasing planet masses (Figure 5). It is ascertained relatively large number of planets with very low masses (M sin i≤0,2Mj ) (Figure 6). The same conclusion has been made also by the authors of [6–10]; • The previous analyses established that t ...
... • The distribution of exoplanet masses increases for decreasing planet masses (Figure 5). It is ascertained relatively large number of planets with very low masses (M sin i≤0,2Mj ) (Figure 6). The same conclusion has been made also by the authors of [6–10]; • The previous analyses established that t ...
Laboratory for AO at UCSC
... constellation at a science wavelength of 900 nm.20 The LGS constellation had 5 stars in a “quincunx” (box-five) pattern and the Hartmann sensors had 36 subapertures across a 10 meter pupil. We assembled a complete error budget with terms measured independently via interferometric methods. This error ...
... constellation at a science wavelength of 900 nm.20 The LGS constellation had 5 stars in a “quincunx” (box-five) pattern and the Hartmann sensors had 36 subapertures across a 10 meter pupil. We assembled a complete error budget with terms measured independently via interferometric methods. This error ...
a changing cosmos - Whittier Union High School District
... is found to be on a collision course with Earth, so that an effort could be made to divert it. Currently, NASA carries out the “Spaceguard Survey” to find NEOs greater than 140 meters in diameter, and this program was budgeted at $4.1 million per year for FY 2006 through FY 2012. In chapter 7, we'll ...
... is found to be on a collision course with Earth, so that an effort could be made to divert it. Currently, NASA carries out the “Spaceguard Survey” to find NEOs greater than 140 meters in diameter, and this program was budgeted at $4.1 million per year for FY 2006 through FY 2012. In chapter 7, we'll ...
The local ISM in three dimensions: kinematics
... ionized warm clouds is a contentious topic. Since this gas is not observed as absorption in neutral hydrogen or singly ionized C, Si, Mg, or Fe, it must be very low density or be more highly ionized. The basic question is whether this gas is close to collisional ionization equilibrium and thus hot, ...
... ionized warm clouds is a contentious topic. Since this gas is not observed as absorption in neutral hydrogen or singly ionized C, Si, Mg, or Fe, it must be very low density or be more highly ionized. The basic question is whether this gas is close to collisional ionization equilibrium and thus hot, ...
2013 - Society for Astronomical Sciences
... If you do not want your presentation to be recorded (video/audio) and/or not posted on the ...
... If you do not want your presentation to be recorded (video/audio) and/or not posted on the ...
Telluric Line Removal in Astrophysical Spectroscopy
... not affected by the motion of the Earth around the Sun. The object’s lines will shift according to the Doppler Effect, being blue shifted slightly when the Earth moves toward the object, and red shifted when the Earth moves away. Since the telluric lines do not shift wavelengths, this motion around ...
... not affected by the motion of the Earth around the Sun. The object’s lines will shift according to the Doppler Effect, being blue shifted slightly when the Earth moves toward the object, and red shifted when the Earth moves away. Since the telluric lines do not shift wavelengths, this motion around ...
BSA Astronomy Merit Badge
... Be gentle. When you are helping a person with hypothermia, handle him or her gently. Limit movements to only those that are necessary. Don't massage or rub the person. Excessive, vigorous or jarring movements may trigger cardiac arrest. Move the person out of the cold. Move the person to a warm, dry ...
... Be gentle. When you are helping a person with hypothermia, handle him or her gently. Limit movements to only those that are necessary. Don't massage or rub the person. Excessive, vigorous or jarring movements may trigger cardiac arrest. Move the person out of the cold. Move the person to a warm, dry ...
22 Years of a Pulsar
... • Method: model timing noise down to 1.5 year period (can’t use solution to model orbital variations). • Significant proper motion • PMα: -12±2 mas/yr • PMδ: -7±2 mas/yr • Consistent with Hipparcos constraints for LS 2883 |PMα|, |PMδ| < 22 mas/yr No proper motion ...
... • Method: model timing noise down to 1.5 year period (can’t use solution to model orbital variations). • Significant proper motion • PMα: -12±2 mas/yr • PMδ: -7±2 mas/yr • Consistent with Hipparcos constraints for LS 2883 |PMα|, |PMδ| < 22 mas/yr No proper motion ...
A spectroscopic investigation of the O
... variable if standard deviations of at least 15 km s−1 are determined. We stress that the threshold value for the rapid rotators has been increased relative to Mahy et al. (2009) because the present data are slightly noisier. As a consequence, we consider, in the present paper, that a star is an SB1 ...
... variable if standard deviations of at least 15 km s−1 are determined. We stress that the threshold value for the rapid rotators has been increased relative to Mahy et al. (2009) because the present data are slightly noisier. As a consequence, we consider, in the present paper, that a star is an SB1 ...
2008-03 LAAS Bulletin I - Los Angeles Astronomical Society
... & B which imply the presence of a second companion, Sirius C. But deep searches with the Hubble Space Telescope, which can easily see Sirius B, reveal (Continued on page 9) ...
... & B which imply the presence of a second companion, Sirius C. But deep searches with the Hubble Space Telescope, which can easily see Sirius B, reveal (Continued on page 9) ...
The Nature of the Stars
... The closer the object you are You measure distances viewing, the greater the parallax shift. To see this, repeat the experiment around you by comparing with your hand held closer to your the images from your face. Your brain analyzes such paral- left and right eyes—we lax shifts constantly as it com ...
... The closer the object you are You measure distances viewing, the greater the parallax shift. To see this, repeat the experiment around you by comparing with your hand held closer to your the images from your face. Your brain analyzes such paral- left and right eyes—we lax shifts constantly as it com ...
PDF - ASSA
... the orbital period must be at least 20 000 years. But there is more! Located just 5' south-east is the fainter, wider, more-equal pair HJ 4252, which shares the field with upsilon in a 150-mm f/8 refractor at 136x. This second set consists of 8.7 and 9.1 magnitude stars separated by 12.2''. Both doub ...
... the orbital period must be at least 20 000 years. But there is more! Located just 5' south-east is the fainter, wider, more-equal pair HJ 4252, which shares the field with upsilon in a 150-mm f/8 refractor at 136x. This second set consists of 8.7 and 9.1 magnitude stars separated by 12.2''. Both doub ...
THE PRIMORDIAL HELIUM ABUNDANCE Manuel Peimbert
... the Standard Big Bang Nucleosynthesis (SBBN), (b) the models of stellar evolution require an accurate initial Y value; this is given by YP plus the additional Y produced by galactic chemical evolution, which can be estimated based on the observationally determined ∆Y/∆O ratio, (c) the combination of ...
... the Standard Big Bang Nucleosynthesis (SBBN), (b) the models of stellar evolution require an accurate initial Y value; this is given by YP plus the additional Y produced by galactic chemical evolution, which can be estimated based on the observationally determined ∆Y/∆O ratio, (c) the combination of ...
Can we account for the dust
... Dust mass : as a function of metallicity of galaxies It has been suggested that it is difficult to form dust grains in stars in low metallicity (Z<0.1 Z) galaxies ...
... Dust mass : as a function of metallicity of galaxies It has been suggested that it is difficult to form dust grains in stars in low metallicity (Z<0.1 Z) galaxies ...
Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993. It was the first space experiment devoted to precision astrometry, the accurate measurement of the positions of celestial objects on the sky. This permitted the accurate determination of proper motions and parallaxes of stars, allowing a determination of their distance and tangential velocity. When combined with radial-velocity measurements from spectroscopy, this pinpointed all six quantities needed to determine the motion of stars. The resulting Hipparcos Catalogue, a high-precision catalogue of more than 118,200 stars, was published in 1997. The lower-precision Tycho Catalogue of more than a million stars was published at the same time, while the enhanced Tycho-2 Catalogue of 2.5 million stars was published in 2000. Hipparcos ' follow-up mission, Gaia, was launched in 2013.The word ""Hipparcos"" is an acronym for High precision parallax collecting satellite and also a reference to the ancient Greek astronomer Hipparchus of Nicaea, who is noted for applications of trigonometry to astronomy and his discovery of the precession of the equinoxes.