Results 41 to 50 of about 441,685 (256)

Astrometry with Hubble Space Telescope Fine Guidance Sensors - A Review [PDF]

, 2016
Over the last 20 years Hubble Space Telescope Fine Guidance Sensor interferometric astrometry has produced precise and accurate parallaxes of astrophysical interesting stars and mass estimates for stellar companions. We review parallax results, and binary star and exoplanet mass determinations, and compare a subset of these parallaxes with preliminary ...
arxiv   +1 more source

A Small Pathbreaking Spacecraft: Giants of Space Research (Bernard Blake, Dieter Hovestadt, and Edward Stone)

Perspectives of Earth and Space Scientists, Volume 6, Issue 1, December 2025.
Abstract The Solar, Anomalous, and Magnetospheric Explorer (SAMPEX) mission launched in July 1992 was the first NASA “Small Explorer” project. It had the goal to show how space missions could be developed much more rapidly than had become the situation in the 1980s and 1990s.
D. N. Baker, G. M. Mason
wiley   +1 more source

Massive Star Formation in the Ultraviolet Observed with the Hubble Space Telescope

Galaxies, 2020
Spectroscopic observations of a massive star formation in the ultraviolet and their interpretation are reviewed. After a brief historical retrospective, two well-studied resolved star clusters and the surrounding H II regions are introduced: NGC 2070 in ...
Claus Leitherer
doaj   +1 more source

Auroral and Non‐Auroral H3+ Ion Winds at Uranus With Keck‐NIRSPEC and IRTF‐iSHELL

Geophysical Research Letters, Volume 52, Issue 7, 16 April 2025.
Abstract To date, no investigation has documented ionospheric flows at Uranus. Previous investigations of Jupiter and Saturn have demonstrated that mapping ion winds can be used to understand ionospheric currents and how these connect to magnetosphere‐ionosphere coupling.
Emma M. Thomas, Tom S. Stallard, Henrik Melin, Mohammad N. Chowdhury, Luke Moore, James O’Donoghue, Rosie E. Johnson, Ruoyan Wang, Katie L. Knowles, Paola I. Tiranti, Neil Dello Russo, Ron J. Vervack Jr., Hideyo Kawakita   +12 more
wiley   +1 more source

Resolving Red Giant Winds with the Hubble Space Telescope

The Astrophysical Journal
We describe recent spectroscopic observations of red giant stars made by the Space Telescope Imaging Spectrograph (STIS) instrument on board the Hubble Space Telescope, which has provided spatially resolved observations of the warm chromospheric winds ...
Brian E. Wood, Graham M. Harper, Hans-Reinhard Müller   +2 more
doaj   +1 more source

Mirror Coating Research and Developments for Current and Future Gravitational‐Wave Detectors

Advanced Photonics Research, Volume 6, Issue 4, April 2025.
In gravitational‐wave detectors, research on mirror coatings is needed to mitigate thermal noise and enhance the detectors’ sensitivity. In this review, an overview of the latest worldwide research activities on coatings with low mechanical loss and low optical absorption is presented, including new coating designs such as multimaterial coatings and ...
Alex Amato, Michele Magnozzi, Janis Wöhler   +2 more
wiley   +1 more source

An Efficient Strategy to Select Targets for Gas-Dynamical Measurements of Black Hole Masses Using the Hubble Space Telescope [PDF]

, 2001
Gas-dynamical studies using the Hubble Space Telescope are an integral component for future progress in the search for massive black holes in galactic nuclei. Here we present an extensive set of gas rotation curves obtained with the Space Telescope Imaging Spectrograph for the central regions of 23 disk galaxies.
arxiv   +1 more source

M Dwarfs from Hubble Space Telescope Star Counts. V. The I-band Luminosity Function [PDF]

Astrophys.J.601:500-501,2004, 2003
We derive the disk I-band luminosity function from the Zheng et al. sample of \~1400 disk M dwarfs observed with the Hubble Space Telescope. We adopt a Galactic-height-dependent color-magnitude relation to account for the metallicity gradient above the Galactic plane.
arxiv   +1 more source

Diagnosing the Atmosphere of Jupiter's Volcanic Moon Io Using Energetic Neutral Atoms (ENAs)

Geophysical Research Letters, Volume 52, Issue 5, 16 March 2025.
Abstract During a Juno spacecraft encounter with Jupiter's volcanic moon Io (30 December 2023), the Jupiter Energetic Particle Detector Instrument (JEDI) observed Energetic Neutral Atoms (ENAs) of >150 keV oxygen and sulfur (O + S) coming from Io's mostly nightside atmosphere. JEDI lines‐of‐sight approached closest to Io between 1.31 and 1.49 Io radii (
B. H. Mauk, H. T. Smith, R. E. Johnson, V. Dols, F. Bagenal, J. E. P. Connerney, S. J. Bolton, G. Clark, D. K. Haggerty, P. Kollmann, C. P. Paranicas   +10 more
wiley   +1 more source

Faint White Dwarf Flux Standards: Data and Models

The Astronomical Journal
Fainter standard stars are essential for the calibration of larger telescopes. This work adds to the calibration spectra (CALSPEC) database of 19 faint white dwarfs (WDs) with all-sky coverage and V magnitudes between 16.5 and 18.7.
Ralph C. Bohlin, Susana Deustua, Gautham Narayan, Abhijit Saha, Annalisa Calamida, Karl D. Gordon, Jay B. Holberg, Ivan Hubeny, Thomas Matheson, Armin Rest   +9 more
doaj   +1 more source