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Precise Measurement of Orbital and Physical Parameters of Bright Detached Solar Analog Eclipsing Binaries

Abstract: We combined photometry from the All Sky Automated Survey (ASAS) and the Transiting Exoplanet Survey Satellite (TESS) with high-resolution spectroscopy from the ESO public archive to obtain, for the first time, absolute physical and orbital parameters for six

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A Study on Different Attitude Strategies and Mission Parameters Based on Lightsail-2

Abstract: The Planetary Society’s LightSail-2 mission successfully validated the orbital maneuvering capability of a solar radiation pressure (SRP) propelled spacecraft. This paper presents a study on two alternative attitude strategies for the orientation of a solar s

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Off-Axis Exact Ray Tracing Algorithm for Zero Coma Point Determination in Classical and Non-Classical Reflective Telescopes

Abstract: In this work we present a general algorithm to calculate the zero coma point for classical and non-classical reflecting telescopes with aspherical surfaces. We programmed a general ray tracing function applicable to conical surfaces with asphericity, displace

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New Photometry and Spectroscopy of DW Cancri

Abstract: We present new observations of the cataclysmic variable DW Cancri, after the system recovered from a low state. We performed a power spectrum analysis that reveals a clear signal of the 38 min spin period in our photometric data. Our spectroscopic power spect

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Morphological Study of a Sample of Dwarf Tidal Galaxies Using the C-A Plane
I. Vega-Acevedo A. M. Hidalgo-Gámez

Abstract: In this investigation, we determined the Concentration (C) and Asymmetry (A) parameters in a sample of tidal dwarf galaxies (TDG) or candidate galaxies. Most of the galaxies in the sample were found to be in a very precise region of the C-A plane, which clear

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First Light Curve Analysis of the Moderate Fill-Out Contact Binary Systems TYC 2402-643-1, TYC 2703-1235-1 and TYC 2913-2145-1

Abstract: We present the results of our study of the W Ursae Majoris eclipsing binary systems (EW) TYC 2402-643-1, TYC 2703-1235-1 and TYC 2913-2145-1 based on CCD observations obtained using Sloan g’ and i’ filters. The light curves were analysed using the latest vers

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The Properties of High Redshift Galaxies
Luz Ángela García

Abstract: This work studies the connection between the first galaxies and their hosting dark matter halos in the early Universe when reionization is concluding. Our numerical models (already presented in an earlier study) trace the star formation history at z = 4 - 8,

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Comprehensive Analysis of the Full Tess Orbital Phase Curve of Wasp-121b
M. Eftekhar

Abstract: We present the full phase curve analysis of the ultrahot Jupiter WASP-121b using observations from the Transiting Exoplanet Survey Satellite (TESS). Our comprehensive phase curve model includes primary transit, secondary eclipse, thermal emission, reflection,

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CCD Photometry and Evolutionary Status of the Hads Variable PT COM
K. B. Alton

Abstract: Multi-color (BV Ic) CCD-derived photometric data were acquired from PT Com, a pulsating variable classified as a high amplitude δ Scuti-type system. Analysis of precise time-series lightcurve data was accomplished using discrete Fourier transformation which r

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A New Visit to the Variable Stars in M56 and its Colour-Magnitude Diagram Structure

Abstract: We present a VI CCD photometric study and a membership analysis of the globular cluster M56 (NGC 6779). This produced a CMD decontaminated from field stars, which enabled a better confrontation with theoretical isochrones, zeroage horizontal branches (ZAHB) a

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Temperature Discrepancy with Photoionization Models of the Narrow-Line Region

Abstract: Using published work on the narrow-line region of active galactic nuclei, a comparison is carried out among the O III λ4363Å/λ5007Å (ROIII) ratio observed in quasars, Seyfert 2's and the spatially resolved ENLR plasma. Using the weak Ar IV λ4711Å/λ4740Å doubl

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Czev502 - An M Dwarf Near the Leo Triplet With Very Strong Flares

Abstract: Discovery of fares in the M dwarf CzeV502 and our follow-up results are presented. We classify it as a dMe eruptive variable of UV Ceti type due to the X-ray activity, measured B -V of 1.5 mag, Hα emission, and fares. Our monitoring revealed only one reliable

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