STELLA MARIS: Stellar Marine Refractive Imaging Sensor
... need passive sensing of the WAI. Passive recovery of the WAI for a virtual periscope1 was theorized, by possible analysis of the radiance near the edge of Snell’s window [22], or sky polarization [40]. We, however, take a different approach, that yields a practical implementation. We observe an anal ...
... need passive sensing of the WAI. Passive recovery of the WAI for a virtual periscope1 was theorized, by possible analysis of the radiance near the edge of Snell’s window [22], or sky polarization [40]. We, however, take a different approach, that yields a practical implementation. We observe an anal ...
observations of white dwarfs in the solar neighborhood
... observed nearly every clear night, generally two per twilight, and a calibration for each observing run (typically of four to six nights) was derived from these. In addition, we observed bright B stars to derive approximate corrections for atmospheric absorption bands. Prior to flux calibration all ...
... observed nearly every clear night, generally two per twilight, and a calibration for each observing run (typically of four to six nights) was derived from these. In addition, we observed bright B stars to derive approximate corrections for atmospheric absorption bands. Prior to flux calibration all ...
Getting an image of Sirius B
... Observing this star is not an easy task. Resolving it in a picture was not easy either, until recent years. Sirius B is these days about 10 arc seconds apart from Sirius A [1,2]. Both stars have apparent magnitudes of 8.3 and -1.47 respectively [3]. During visual observations, Sirius B gets confused ...
... Observing this star is not an easy task. Resolving it in a picture was not easy either, until recent years. Sirius B is these days about 10 arc seconds apart from Sirius A [1,2]. Both stars have apparent magnitudes of 8.3 and -1.47 respectively [3]. During visual observations, Sirius B gets confused ...
low-res - Communicating Astronomy with the Public Journal
... At a distance of nearly four thousand kilometres Saturn’s moon Iapetus looms into view in this incredible new image from the NASA/ESA Cassini-Huygens mission. Bright regions show areas where ice has been uncovered by impacts on the sides of these colossal mountains which rise up a staggering ten kil ...
... At a distance of nearly four thousand kilometres Saturn’s moon Iapetus looms into view in this incredible new image from the NASA/ESA Cassini-Huygens mission. Bright regions show areas where ice has been uncovered by impacts on the sides of these colossal mountains which rise up a staggering ten kil ...
OBSERVATIONS OF DISINTEGRATING, EVAPORATING AND HOT
... Hot Jupiters have been a big boon for exoplanet science because they enabled the early detection of planets outside the Solar System and the early detection of detailed atmospheric and orbital parameters to model and study comparatively. Our giant planets all take more than 11 years to orbit the Sun ...
... Hot Jupiters have been a big boon for exoplanet science because they enabled the early detection of planets outside the Solar System and the early detection of detailed atmospheric and orbital parameters to model and study comparatively. Our giant planets all take more than 11 years to orbit the Sun ...
SPIRAL STRUCTURE IN THE OUTER GALACTIC
... [TCDs] and different CMDs). This method works well for stars with spectral types earlier than A0 while becoming almost impractical to segregate late faint cluster members from field stars in crowded fields. It has been criticized by Abt (1979), but as stated by Turner et al. (1980) and later emphasi ...
... [TCDs] and different CMDs). This method works well for stars with spectral types earlier than A0 while becoming almost impractical to segregate late faint cluster members from field stars in crowded fields. It has been criticized by Abt (1979), but as stated by Turner et al. (1980) and later emphasi ...
UNIT 2—THE BIG BANG
... of this, his ideas were accepted by Byzantine, Islamic and Europe scholars for more than 1,400 years. Ptolemy accepted Aristotle’s idea that the Sun and the planets revolve around a spherical Earth, a geocentric view. Ptolemy developed this idea through observation and in mathematical detail. In doi ...
... of this, his ideas were accepted by Byzantine, Islamic and Europe scholars for more than 1,400 years. Ptolemy accepted Aristotle’s idea that the Sun and the planets revolve around a spherical Earth, a geocentric view. Ptolemy developed this idea through observation and in mathematical detail. In doi ...
Article PDF - IOPscience
... value, −100 ADU, and are ignored afterward. Next, cosmic rays and hot pixels are flagged automatically and sky images are created in order to provide an initial guess of the background. At the same time, the X, Y offsets between each image and a reference image (for G11 the image u9x6f001m_c0f in th ...
... value, −100 ADU, and are ignored afterward. Next, cosmic rays and hot pixels are flagged automatically and sky images are created in order to provide an initial guess of the background. At the same time, the X, Y offsets between each image and a reference image (for G11 the image u9x6f001m_c0f in th ...
Polarimetry: a powerful diagnostic tool in astronomy
... 0.811, the very bright nucleus (a hidden quasar) illuminates the galaxy, which then appears as a giant reflection nebula with polarizations as high as 10%, despite dilution by stars in the galaxy (figure 5). The polarization pattern can be used to determine the location of the obscured source (where ...
... 0.811, the very bright nucleus (a hidden quasar) illuminates the galaxy, which then appears as a giant reflection nebula with polarizations as high as 10%, despite dilution by stars in the galaxy (figure 5). The polarization pattern can be used to determine the location of the obscured source (where ...
German LOFAR - LOFAR at MPA
... LOFAR constitutes a conceptional change with respect to earlier radio telescopes resulting in a significant reduction in cost. This has been achieved by going from steel to silicon: classical large dishes which focus the radiation are replaced by a multitude of small and cheep antennas that sample r ...
... LOFAR constitutes a conceptional change with respect to earlier radio telescopes resulting in a significant reduction in cost. This has been achieved by going from steel to silicon: classical large dishes which focus the radiation are replaced by a multitude of small and cheep antennas that sample r ...
Jul y 10-12,
... A handful of Galactic High Mass X-ray Binaries have been observed to emit radiation at very high energies (MeV-TeV), dubbed gamma-ray binaries. This poster will review the importance of multiwavelength observations for understanding two of these systems, HD 259440 and LS 5039. For HD 259440, detecti ...
... A handful of Galactic High Mass X-ray Binaries have been observed to emit radiation at very high energies (MeV-TeV), dubbed gamma-ray binaries. This poster will review the importance of multiwavelength observations for understanding two of these systems, HD 259440 and LS 5039. For HD 259440, detecti ...
interstellar dust - Ira-Inaf
... graphite (carbon) and/or silicates (rock-like minerals) often coated with water ice. ...
... graphite (carbon) and/or silicates (rock-like minerals) often coated with water ice. ...
The Sun as a star: observations of white-light flares - HAL-Insu
... 2009) identified WL emission in relatively small flares, which supports the view that WL emission could be a peculiar feature of a flare and not associated to the largest flares only. Knowing how much energy is radiated as a whole and at each wavelength is important both to understand the physical p ...
... 2009) identified WL emission in relatively small flares, which supports the view that WL emission could be a peculiar feature of a flare and not associated to the largest flares only. Knowing how much energy is radiated as a whole and at each wavelength is important both to understand the physical p ...
Hubble Deep Field
The Hubble Deep Field (HDF) is an image of a small region in the constellation Ursa Major, constructed from a series of observations by the Hubble Space Telescope. It covers an area 2.5 arcminutes across, about one 24-millionth of the whole sky, which is equivalent in angular size to a 65 mm tennis ball at a distance of 100 metres. The image was assembled from 342 separate exposures taken with the Space Telescope's Wide Field and Planetary Camera 2 over ten consecutive days between December 18 and December 28, 1995.The field is so small that only a few foreground stars in the Milky Way lie within it; thus, almost all of the 3,000 objects in the image are galaxies, some of which are among the youngest and most distant known. By revealing such large numbers of very young galaxies, the HDF has become a landmark image in the study of the early universe, with the associated scientific paper having received over 900 citations by the end of 2014.Three years after the HDF observations were taken, a region in the south celestial hemisphere was imaged in a similar way and named the Hubble Deep Field South. The similarities between the two regions strengthened the belief that the universe is uniform over large scales and that the Earth occupies a typical region in the Universe (the cosmological principle). A wider but shallower survey was also made as part of the Great Observatories Origins Deep Survey. In 2004 a deeper image, known as the Hubble Ultra-Deep Field (HUDF), was constructed from a few months of light exposure. The HUDF image was at the time the most sensitive astronomical image ever made at visible wavelengths, and it remained so until the Hubble Extreme Deep Field (XDF) was released in 2012.