Ludwig O. Struve (1858-1920): The beginning of positional astronomy in the Kharkiv Astronomical Observatory

2021 ◽  
Vol 37 (5) ◽  
pp. 74-82
Author(s):  
М. Balyshev
Keyword(s):  
Astronomical Observatory ◽  
Positional Astronomy

scholarly journals Life and scientific activity of Dusan Saletic (1927-1999)

2000 ◽  
pp. 97-100
Author(s):  
S. Sadzakov ◽  
M. Dacic ◽  
Z. Cvetkovic
Keyword(s):  
Scientific Activity ◽  
Astronomical Observatory ◽  
Positional Astronomy

Dusan Saletic, engineer-geodesist and colonel of the Yugoslav army, for many years an external collaborator of the Belgrade Astronomical Observatory had a prominent share in the accomplishment of some task concerning the problems of the positional astronomy. Presentation is here given of his activity and achievements in that field, along with the list of his published works.

Radar positional astronomy: status and prospects

1983 ◽  
Vol 139 (2) ◽  
pp. 359
Author(s):  
V.A. Alekseev ◽  
V.N. Nikonov ◽  
V.S. Troitskii
Keyword(s):  
Positional Astronomy

scholarly journals Activity of the first interstellar comet 2I/Borisov around perihelion: results from Indian observatories

2021 ◽  
Vol 502 (3) ◽  
pp. 3491-3499
Author(s):  
K Aravind ◽  
Shashikiran Ganesh ◽  
Kumar Venkataramani ◽  
Devendra Sahu ◽  
Dorje Angchuk ◽  
...  
Keyword(s):  
Solar System ◽  
Production Rate ◽  
Rate Ratio ◽  
Carbon Chain ◽  
Astronomical Observatory ◽  
Nucleus Size ◽  
Chain Molecules ◽  
Molecular Emission ◽  
Imaging And Spectroscopy ◽  
Gas Ratio

ABSTRACT Comet 2I/Borisov is the first true interstellar comet discovered. Here, we present results from observational programs at two Indian observatories, 2 m Himalayan Chandra Telescope at the Indian Astronomical Observatory, Hanle (HCT) and 1.2 m telescope at the Mount Abu Infrared Observatory (MIRO). Two epochs of imaging and spectroscopy were carried out at the HCT and three epochs of imaging at MIRO. We found CN to be the dominant molecular emission on both epochs, 2019 November 30 and December 22, at distances of rH = 2.013 and 2.031 au, respectively. The comet was inferred to be relatively depleted in Carbon bearing molecules on the basis of low C2 and C3 abundances. We find the production rate ratio, Q(C2)/Q(CN) = 0.54 ± 0.18, pre-perihelion and Q(C2)/Q(CN) = 0.34 ± 0.12 post-perihelion. This classifies the comet as being moderately depleted in carbon chain molecules. Using the results from spectroscopic observations, we believe the comet to have a chemically heterogeneous surface having variation in abundance of carbon chain molecules. From imaging observations, we infer a dust-to-gas ratio similar to carbon chain depleted comets of the Solar system. We also compute the nucleus size to be in the range 0.18 km ≤ r ≤ 3.1 km. Our observations show that 2I/Borisov’s behaviour is analogous to that of the Solar system comets.

scholarly journals Ground operation equipment for the orbiting astronomical observatory

1963 ◽  
Author(s):  
E. J. Habib ◽  
A. G. Ferris ◽  
H. W. Cooper ◽  
R. L. McConaughy
Keyword(s):  
Astronomical Observatory

Solar physics at the astronomical Observatory of Rome

Solar Physics ◽  
1967 ◽  
Vol 2 (3) ◽  
pp. 375-380 ◽  
Author(s):  
M. Cimino
Keyword(s):  
Solar Physics ◽  
Astronomical Observatory
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