scholarly journals FIRST RESULTS OF PROCESSING DIGITIZED V-PLATES TAKEN WITH THE TAUTENBURG 2m SCHMIDT TELESCOPE

2021 ◽  
Vol 34 ◽  
pp. 100-105
Author(s):  
V. Andruk ◽  
L. Pakuliak ◽  
O. Yizhakievych ◽  
S. Shatokhina
Keyword(s):  
Image Processing ◽  
Minor Planets ◽  
Schmidt Telescope ◽  
Positional Accuracy ◽  
V Band ◽  
Linear Dimensions ◽  
Color System ◽  
First Results ◽  
Photometric Error ◽  
Gaia Dr2

The process of treatment of about 500 digitized plates has started in MAO NAS of Ukraine. Plates were taken with the Tautenburg 2m Schmidt telescope in 1963-1989. Linear dimensions of plates are 24x24 cm with a working field of 3.3x3.3 degrees and a scale of 51.4 "/ mm. Astronegatives were digitized on the Tautenburg Plate Scanner in five strips with linear dimensions of 5 400x23 800 px. The software developed in MAO NAS of Ukraine for the image processing of these scans takes into account the horizontal overlap and the vertical offset of strips. The photometric range of fixed objects is 12 magnitudes, around V = 7 m - 19 m , due to the separation of objects into faint and bright parts by their images’ diameters. Positions of stars and other fixed objects are obtained in the GAIA DR2 reference system. Magnitudes are defined in the V-band of the Johnson color system. The resulted positional accuracy defined from 180 plates’ processing is σ RA,DEC = 0.10"for both coordinates, photometric error on the whole range of magnitudes is σ V = 0.14 m . The convergence of resulted magnitudes with ones from photoelectric standards’ data is 0.19 m . In parallel with image processing and plate data reduction, the search for minor planets’ images was carried out. Nine positions and magnitudes of 4 asteroids registered on the plates obtained in 1963-1965 were defined and used for further analysis.

scholarly journals Filamentary Shell Structures from the AAO/UKST Hα Survey

2001 ◽  
Vol 18 (3) ◽  
pp. 259-266 ◽  
Author(s):  
A. J. Walker ◽  
W. J. Zealey ◽  
Q. A. Parker
Keyword(s):  
Supernova Remnant ◽  
Galactic Plane ◽  
Optical Emission ◽  
Shell Structures ◽  
Schmidt Telescope ◽  
First Results

AbstractHere we present the first results of a search for new optical supernova remnant candidates and other filamentary objects on films produced by the Anglo-Australian Observatory/UK Schmidt Telescope Há Survey. Sixty-one fields, or 26% of the Galactic plane survey fields, have been visually examined. This has resulted in the detection of four newlarge diameter filamentary structures, and the discovery of extensive new optical emission in two previously known optical supernova remnant candidates.

The Alphasat Aldo Paraboni experiment: Fade mitigation techniques in Q/V-band satellite channels, first results

2015 ◽  
Author(s):  
Johannes Ebert ◽  
Michael Schmidt ◽  
Harald Schlemmer ◽  
Eral Turkyilmaz ◽  
Sabine Kastner-Puschl ◽  
...  
Keyword(s):  
V Band ◽  
First Results ◽  
Satellite Channels ◽  
Mitigation Techniques

scholarly journals EARLY KYIV OBSERVATIONS OF ASTEROIDS: ANALYSIS AND NEW REDUCTION WITH TYCHO-2 AND GAIA CATALOGS

2021 ◽  
Vol 34 ◽  
pp. 114-118
Author(s):  
S.V. Shatokhina ◽  
L.V. Kazantseva
Keyword(s):  
High Accuracy ◽  
Astronomical Observatory ◽  
National Academy Of Sciences ◽  
Positional Accuracy ◽  
Comparison Results ◽  
National University ◽  
Random Components ◽  
Academy Of Sciences ◽  
Positional Data ◽  
Gaia Dr2

For more than 50 years, the continuous photographic observations of asteroids have been carried outwith telescopes of the Astronomical Observatory of the Taras Shevchenko National University of Kyiv and the Main Astronomical Observatory of the National Academy of Sciences of Ukraine. About 3,000 photographic plates were obtained, some of which were exposed in 1908. We collected the data on more than 5,500 positions and magnitudes of asteroids on these astroplates taking into account all results of the processing of observations available in various publications and in the Minor Planet Center database. All positional data were compared with JPL ephemeris and analyzed. From different series of asteroid observations the values of positional accuracy were obtained, depending on the methods of measuring and processing the plates and reference catalogs of stars. In order to systematically improve the obtained asteroid positions, we evaluated the possibilities of reprocessing some of the earliest asteroid observations applying the modern star high accuracy catalogs. Using the Tycho-2, Gaia DR2, and Gaia EDR3 as the reference catalogs, the 590 astroplates exposed on the MAO NASU Double Long-Focus Astrograph (DLA) in 1952-1986 were reprocessed based on old plate measurements. All newly determined and previous original asteroid positions were compared with the JPL ephemeris. The comparison results show an improvement in the systematic and random components of the accuracy of coordinates for new positions of asteroids. When comparing the new positions of the asteroids  determined in the Tycho-2 and Gaia catalog systems, no significant changes in accuracy were found.

Investigation of the nearby open clusters with Gaia DR2 data

2019 ◽  
Vol 14 (S351) ◽  
pp. 502-506
Author(s):  
Anton F. Seleznev ◽  
Vladimir M. Danilov ◽  
Giovanni Carraro
Keyword(s):  
Three Dimensional ◽  
Open Clusters ◽  
Dimensional Structure ◽  
Proper Motions ◽  
Membership Probability ◽  
First Results ◽  
Alpha Persei ◽  
Mass Functions ◽  
Tidal Tails ◽  
Gaia Dr2

AbstractGaia DR2 catalog provides a unique possibility to study the three-dimensional structure and the three-dimensional velocity field of the nearby open clusters. We can either select stars with a maximum membership probability and the most accurate values for the proper motions, parallaxes, and the radial velocities, or study these clusters statistically using overwhelmingly large areas of sky of tens by tens degrees. The second approach allows us to reveal the extensive outer parts of the clusters - a corona and the tidal tails and to study the luminosity and mass functions of these clusters. We present the first results of the investigation of several nearby open clusters, including Pleiades, Alpha Persei, Ruprecht 147.

scholarly journals The Dust Cavity Around the Exciting Star of Small H II Regions

1987 ◽  
Vol 115 ◽  
pp. 189-190 ◽  
Author(s):  
S. Yoshida ◽  
S. Mizuno ◽  
M. Nakano ◽  
T. Kogure ◽  
T. Sasaki ◽  
...  
Keyword(s):  
Image Processing ◽  
Angular Size ◽  
H Ii Regions ◽  
Surface Photometry ◽  
Continuum Intensity ◽  
V Band ◽  
Exciting Star

In a series of observations (Mizuno et al. 1981; Mizuno 1982; Nakano et al. 1983), we have carried out the surface photometry of small H II regions which were selected from Sharpless catalogue (1959) by the following properties: (1) small angular size (≦ 10 arcmin), (2) round and simple appearance, and (3) a single BO V star as the exciting star. Properties (1) and (2) are for the convenience of image processing, and property (3) is to avoid the contamination of [O III] emission in the V-band so as to get pure continuum intensity.

Accurate Near-Earth-Object Astrometry using Synthetic Tracking and Applications

2020 ◽  
Author(s):  
Chengxing Zhai ◽  
Michael Shao ◽  
Navtej Saini ◽  
Russell Trahan ◽  
Philip Choi ◽  
...  
Keyword(s):  
Moving Objects ◽  
Time Windows ◽  
Observation Time ◽  
Detection Sensitivity ◽  
Short Exposure ◽  
Minor Planets ◽  
Gravitational Acceleration ◽  
Tracking Technique ◽  
Earth Object ◽  
Gaia Dr2

<p>Synthetic tracking technique uses multiple short exposure images to observe moving objects to prevent the objects from streaking in an individual frame. It integrates frames in post-processing, where the tracking of telescope at any desired rate can be simulated by shifting frames accordingly. Such an approach avoids trailing loss, thus improves detection sensitivity, especially for fast moving objects. It also yields accurate astrometry for moving objects independent of rate of motion with precision comparable to stellar astrometry. Using the Gaia DR2 catalog, we are able to demonstrate 10 mas level near-Earth-object (NEO) astrometry with the synthetic tracking technique. Accurate NEO astrometry allows us to determine NEO orbit more precisely. We discuss applications such as cataloging newly discovered NEOs with less measurements and/or from observation time windows covering shorter orbit arcs, better predicting the chance for a potentially hazardous asteroid to impact the Earth, measuring non-gravitational acceleration to infer physical properties of minor planets, and optical navigation for future spacecraft carrying optical communication lasers.</p>

CHARACTER SEGMENTATION METHOD FOR DIGITAL BACK-LIGHT CONSOLE UNDER DIFFERENT LIGHTING CONDITIONS

2016 ◽  
Vol 78 (5-9) ◽  
Author(s):  
Siriwuttichai Niruttisai ◽  
Settha Tangkawanit ◽  
Surachet Kanprachar
Keyword(s):  
Image Processing ◽  
Adaptive Threshold ◽  
Character Segmentation ◽  
Segmentation Method ◽  
The Real ◽  
Image Processing Techniques ◽  
Lighting Conditions ◽  
Color System ◽  
Image Capturing ◽  
Processing Techniques

Nowadays, the amount of electronics data has been significantly increased especially for the case of capturing images. One particular application regarding this is the image capturing of the monitoring console. The real information in such console image capturing is the characters on the console. To transfer or store the captured images, a large amount of data is required. Instead of storing the whole image, some image processing techniques could be applied in order to reduce the amount of data required.  In this paper, an image processing is done to the captured image by considering the value (V) parameter of the HSV (Hue, Saturation, and Value) color system. An adaptive threshold algorithm on V parameter is adopted for segmenting the console area and then the character areas from the whole image. Under different lighting conditions from 0 to 450 lux, the console area can be correctly selected. And, the characters appearing on the console area can be retrieved with 98 percent of accuracy.

scholarly journals First results in the development of a mobile robot with trajectory planning and object recognition capabilities

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Talgat Islamgozhayev ◽  
Maksat Kalimoldayev ◽  
Arman Eleusinov ◽  
Shokan Mazhitov ◽  
Orken Mamyrbayev
Keyword(s):  
Image Processing ◽  
Object Recognition ◽  
Mobile Robot ◽  
Mobile Robots ◽  
Educational Research ◽  
Trajectory Planning ◽  
Template Matching ◽  
Processing Unit ◽  
First Results ◽  
Recognition Systems

Abstract The use of mobile robots is becoming popular in many areas of service because they ensure safety and good performance while working in dangerous or unreachable locations. Areas of application of mobile robots differ from educational research to detection of bombs and their disposal. Based on the mission of the robot they have different configurations and abilities – some of them have additional arms, cranes and other tools, others use sensors and built-in image processing and object recognition systems to perform their missions. The robot that is described in this paper is mobile robot with a turret mounted on top of it. Different approaches have been tested while searching for best method suitable for image processing and template matching goals. Based on the information from image processing unit the system executes appropriate actions for planning motions and trajectory of the mobile robot.

scholarly journals MOCCA Survey Database: Extra Galactic Globular Clusters. I. Method and first results

2021 ◽  
Author(s):  
A Leveque ◽  
M Giersz ◽  
M Paolillo
Keyword(s):  
Globular Clusters ◽  
Surface Brightness ◽  
Velocity Dispersion ◽  
Structural Parameters ◽  
Dynamical Evolution ◽  
Central Surface ◽  
First Results ◽  
Preliminary Study ◽  
Galactic Globular Clusters ◽  
Gaia Dr2

Abstract Over the last few decades, exhaustive surveys of extra Galactic globular clusters (EGGCs) have become feasible. Only recently, limited kinematical information of globular clusters (GCs) were available through Gaia DR2 spectroscopy and also proper motions. On the other hand, simulations of GCs can provide detailed information about the dynamical evolution of the system. We present a preliminary study of EGGCs- properties for different dynamical evolutionary stages. We apply this study to 12 Gyr-old GCs simulated as part of the MOCCA Survey Database. Mimicking observational limits, we consider only a subssample of the models in the database, showing that it is possible to represent observed Milky Way GCs. In order to distinguish between different dynamical states of EGGCs, at least three structural parameters are necessary. The best distinction is achieved by considering the central parameters, those being observational core radius, central surface brightness, ratio between central and half-mass velocity dispersion, or similarly considering the central color, the central V magnitude and the ratio between central and half-mass radius velocity dispersion, although such properties could be prohibitive with current technologies. A similar but less solid result is obtained considering the average properties at the half-light radius, perhaps accessible presently in the Local Group. Additionally, we mention that the color spread in EGGCs due to internal dynamical models, at fixed metallcity, could be just as important due to the spread in metallicity.

Sign in / Sign up

Export Citation Format

Share Document