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9 Results Found

  • Article
  • Open Access
12 Citations
3,889 Views
16 Pages

On-Orbit Geometric Calibration from the Relative Motion of Stars for Geostationary Cameras

  • Linyi Jiang,
  • Xiaoyan Li,
  • Liyuan Li,
  • Lin Yang,
  • Lan Yang,
  • Zhuoyue Hu and
  • Fansheng Chen

7 October 2021

Affected by the vibrations and thermal shocks during launch and the orbit penetration process, the geometric positioning model of the remote sensing cameras measured on the ground will generate a displacement, affecting the geometric accuracy of imag...

  • Article
  • Open Access
13 Citations
3,701 Views
43 Pages

Multi-Component MHD Model of Hot Jupiter Envelopes

  • Andrey Zhilkin and
  • Dmitri Bisikalo

5 November 2021

A numerical model description of a hot Jupiter extended envelope based on the approximation of multi-component magnetic hydrodynamics is presented. The main attention is focused on the problem of implementing the completed MHD stellar wind model. As...

  • Article
  • Open Access
8 Citations
3,205 Views
29 Pages

Formation of Transitional cE/UCD Galaxies through Massive/Dwarf Disc Galaxy Mergers

  • Alexander V. Khoperskov,
  • Sergey S. Khrapov and
  • Danila S. Sirotin

25 December 2023

The dynamics of the merger of a dwarf disc galaxy with a massive spiral galaxy of the Milky Way type were studied in detail. The remnant of such interaction after numerous crossings of the satellite through the disc of the main galaxy was a compact s...

  • Article
  • Open Access
3 Citations
2,820 Views
22 Pages

An Improved Multi-Target Tracking Method for Space-Based Optoelectronic Systems

  • Rui Zhu,
  • Qiang Fu,
  • Guanyu Wen,
  • Xiaoyi Wang,
  • Nan Liu,
  • Liyong Wang,
  • Yingchao Li and
  • Huilin Jiang

2 August 2024

Under space-based observation conditions, targets are subject to a large number of stars, clutter, false alarms, and other interferences, which can significantly impact the traditional Gaussian mixture probability hypothesis density (GM-PHD) filterin...

  • Article
  • Open Access
1,048 Views
14 Pages

Black Holes as Gravitational Mirrors

  • Luis C. N. Santos,
  • Franciele M. da Silva,
  • Celio R. Muniz and
  • Valdir B. Bezerra

Retrolensing is a gravitational lensing effect in which light emitted by a background source is deflected by a black hole and redirected toward the observer after undergoing nearly complete loops around the black hole. In this context, we explore the...

  • Article
  • Open Access
3,129 Views
16 Pages

4 December 2018

Stellar point image coordinates are one of the important observations needed for high-precision space attitude measurement with a star sensor. High-coupling imaging errors occur under dynamic imaging conditions. Using the results of preliminary star...

  • Article
  • Open Access
29 Citations
3,248 Views
18 Pages

Estimating the Parameters of Extended Gravity Theories with the Schwarzschild Precession of S2 Star

  • Duško Borka,
  • Vesna Borka Jovanović,
  • Salvatore Capozziello,
  • Alexander F. Zakharov and
  • Predrag Jovanović

28 October 2021

After giving a short overview of previous results on constraining of Extended Gravity by stellar orbits, we discuss the Schwarzschild orbital precession of S2 star assuming the congruence with predictions of General Relativity (GR). At the moment, th...

  • Article
  • Open Access
239 Views
24 Pages

13 March 2026

This study presents a quantitative, scenario-based framework for analyzing humanity’s potential progression along the Kardashev scale, with emphasis on the transition to Type I (planetary-scale) and Type II (stellar-scale) civilization status....