Jan Walery Jędrzejewicz (1835–1887) and his Observations of Comets

Jan Walery Jędrzejewicz was a medical doctor with active practice in Płońsk and an astronomer by passion. In fact, astronomy was a second profession for ‘Dr. Jedrzejewicz’, as he signed his astronomical publications. He built his own observatory in Płońsk, small village situated about 70 km from Warsaw, which he equipped with professional instruments. Thanks to that, he could perform precise astronomical observations. In the astronomical community, he was known and esteemed for his precise measurements of double stars. He also measured the position of many comets discovered at that times, including long-period ones. This study is devoted to the analysis of precision of Jędrzejewicz measurements on the examples of three long-period comets, today known as C/1885 X1 Fabry, C/1885 X2 Barnard and C/1886 T1 Barnard-Hartwig.

SPECKLE INTERFEROMETRY AT THE OBSERVATORIO ASTRONÓMICO NACIONAL. VII

The results of speckle interferometric measurements of binary stars performed during June, 2016 with the 2.1 m telescope at the Observatorio Astronómico Nacional at SPM (México) are given. We report 480 astrometric measurements of 468 double stars systems. The measured angular separations ρ range from 0’’.091 to 5’’.93. Most of the observed pairs (414 out of 468) are close double stars having separations of ρ ≤ 1’’. We confirm as double stars 59 targets and we found 3 new pairs with separation of less than 1’’. Finally, we show that the high resolution autocorrelation function in polar coordinates allows to easily recover astrometric parameters even in the presence of strong telescope aberrations.

Some features of an interaction of electromagnetic radiation quantums with a gravitational field and a problem of graviton

The problems connected to propagation of a gravitational field are considered. The law of electromagnetic radiation frequency change in gravitational field is shown. The problem of a gravitational field quantization is investigated. Energy of a graviton is found by two ways. First, on the basis of use quantum gravitational eikonal and Lagrangian of a gravitational field the energy of a solitary graviton is found. It is shown that graviton has the mass proportional to its frequency. Second, due to refusal from symmetric stresses tensor in structure of an energy-impulse tensor the quantum form of the energy-impulse tensor in Einstein's equation is found. It has allowed found the energy of a solitary graviton. Both ways of an energy graviton finding has given the identical result. It is shown that the solution of the Einsteins equation with use of the quantum form of an energy-impulse tensor for the certain direction represents the sum of a gravitational wave and a graviton. It is found out that at approach of a graviton to the massive bodies (double stars) radiating gravitational waves there is a resonant pumping of the gravitational field energy of these bodies to the gravitons with increase in their mass and frequency. It enables registration of the gravitons with the help of the detector located near to massive bodies. The assumption is made that dark energy of a gravitational field is all set of the graviton energies of a space.

On the (Consecutively) Super Edge-Magic Deficiency of Subdivision of Double Stars

Let G be a finite, simple, and undirected graph with vertex set V G and edge set E G . A super edge-magic labeling of G is a bijection f : V G ∪ E G ⟶ 1,2 , … , V G + E G such that f V G = 1,2 , … , V G and f u + f u v + f v is a constant for every edge u v ∈ E G . The super edge-magic labeling f of G is called consecutively super edge-magic if G is a bipartite graph with partite sets A and B such that f A = 1,2 , … , A and f B = A + 1 , A + 2 , … , V G . A graph that admits (consecutively) super edge-magic labeling is called a (consecutively) super edge-magic graph. The super edge-magic deficiency of G , denoted by μ s G , is either the minimum nonnegative integer n such that G ∪ n K 1 is super edge-magic or + ∞ if there exists no such n . The consecutively super edge-magic deficiency of a graph G is defined by a similar way. In this paper, we investigate the (consecutively) super edge-magic deficiency of subdivision of double stars. We show that, some of them have zero (consecutively) super edge-magic deficiency.

Seen, not measured: Relocating drawing within astronomical observations

This paper presents a practice-based research project that explores archival material documenting data collection in nineteenth-century astronomy and locates drawing as a point of access into the shift from human- to technology-dominated methods of observation and representation. I focus on two works that use drawing in contrasting ways. First, by adopting marks from handwritten logbooks as a form of drawing that is laser-etched onto mirrors to highlight the under-acknowledged work of women ‘star measurers’. This technique of remediating drawn lines references both the scientific discourse and the social framework that structured the women’s work, and I use a technique of light reflection to illuminate the absence of their identity in previous narratives of this history. The second line of inquiry is based on written descriptions of double stars. Using hand-drawn animation, I have forged a connection between human and machine interpretation and description of astronomical phenomena, to investigate the involvement of multiple authors in this process. These works provide material explorations into the shift between manual labour and machine automation to illuminate the human traces of expression that are embedded into technological processes. I propose that drawing in combination with other media can offer insight into this increasingly entangled and complex relationship for both artistic and scientific discourses.