Chandra X-ray observations of young clusters. I. NGC 2264 data
We present results of a Chandra observation of a field in NGC 2264.
Chandra↗
Engineering topics
Pravdo, S.
Publications and source records attributed to Pravdo, S..
Recent discoveries and advances for the Near-Earth asteroid tracking program with MSSS 1.2-meter telescope
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NEO near earth objects NEAT Near-Earth Asteroid Tr↗
An Orbital Light Curve Model and Spectral Features in GX301-2
We present the results of X-ray observations of GX301-2 with instruments aboard the ASCA and RXTE spacecraft, as well as analysis of archival data from BATSE/CGRO and the All-Sky Monitor on RXTE.
stars GX301-2 X-rays↗
The Number of Kilometer-Sized Near-Earth Asteroids
In recent years, astronomers have focused their attention upon the near-Earth asteroids (NEAs), which are small (less than 10km), generally rocky solar-system bodies with orbits approaching Earth.
ateroids NEA NEO Near-Earth asteroid↗
SkyMorph: A Three Dimensional Sky Archive
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SkyMorph NEAT Near-Earth Asteroid Tracking RGB NAS↗
Astrometric and Photometric Observations of 1996 PW, a Very Eccentric Asteroid
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TMO Table Mountain Observatory NEAT Near Earth Ast↗
Detection of Extra-Solar Planets with Ground-Based Telescopes
The detection of extra-solar planets around stars like the Sun remains a unfulfilled goal of astronomy.
extra-solar planets photon noise differential chro↗
The Astrometric Imaging Telescope Optical System
This oral presentation describes the Astrometric Imaging Telescope as a space-based observatory designed to detect and study planetary systems and circumstellar material around hundreds of nearby stars.
N/A↗
Modelling of a space-based Ronchi ruling experiment for high-precision astrometry
An end-to-end modelling program for an astrometric telescope employing a Ronchi ruling has been developed. The program models the aberrated images formed anywhere in the field-of-view. It then determines apparent centroids by simulating the motion of a Ronchi ruling across the field. Photo-electron statistics are included. A 6-term plate-constant model is used to determine the apparent motion of a target star within a reference frame as the object is re-observed through both ideal and perturbed optics. The modelling code is accurate at the submicroarcsecond level. optics. The modelling code is accurate at the submicroarcsecond level.
Shaklan, S.↗
Emission-Line Pre-Main Sequence Stars and X-Ray Sources in Orion
we use low-resolution, broadband optical spectroscopy and high-resolution X-ray imaging to continue the study of X-ray sources in a portion of the Orion star-formation region about 1 degree south of the Trapezium.
stars: emission lines--stars: pre-main sequence-- ↗
Modelling of a Space-Based Ronchi Ruling Experiment for High-Precision Astrometry
An end-to-end modelling program for an astrometric telescope employing a Ronchi ruling has been developed. The program models the aberrated images formed anywhere in the field-of-view. It then determines apparent centroids by simulating the motion of a Ronchi ruling across the field. Photo-electon statistics are included.
Ronchi↗
A Space-Based CCD Experiment for High Precision Astrometry
The Astrometric Imaging Telescope, an orbiting 1.5 m low-distortion Ritchey-Chretien, will use a large format CCD to record star trails as the CCD is dragged across the image plane.
star-trail↗
Low energy X-ray emission from five galaxy cluster sources
We report the detection of soft (0.2-2.5 keV) X-ray emission from several known cluster X-ray sources using the low energy detectors of the HEAO 1 A-2 experiment. Soft X-ray emission was observed from five clusters - the Centaurus cluster, Abell 2147, SC 1329-314, Abell 2319, and Abell 133. Spectral parameters estimated from the soft X-ray fluxes are inconsistent with those reported at higher energies for the Centaurus cluster, Abell 2147, and SC 1329-314, indicating the presence of more than one spectral component in these clusters. No evidence for more than one component was found for either Abell 2319 or Abell 133. The temperature of Abell 133 is constrained to be less than 2 x 10 to the 7th K, making it the coolest X-ray cluster yet detected.
Reichert, G.↗