Results 171 to 180 of about 501,201 (339)

Preliminary observations at 10-cm wavelength using the NRL 84-foot radio telescope [PDF]

, 1959
E. F. McClain, R. M. Sloanaker
openalex   +1 more source

The Slow‐Rotating Nucleus of Comet C/2013 R1 (Lovejoy)

Astronomische Nachrichten, EarlyView.
ABSTRACT The close approach of comet C/2013 R1 (Lovejoy) allowed us to conduct an in‐depth study of the morphology of the inner coma. From the measurement of the dust emission structures expanding near the cometary nucleus in November–December 2013, we derived a slow rotation period of 47.8±1.2$$ 47.8\pm 1.2 $$ h.
Federico Manzini, Virginio Oldani, Andrea Farina, Paolo Ochner, Andrea Reguitti, Luigi R. Bedin, Jean Gabriel Bosch, Erik Bryssinck, Roberto Crippa, Stéphan Gaumont‐Guay, Carl W. Hergenrother, Joel Nicolas, Ivo Scheggia   +12 more
wiley   +1 more source

Stellar Photography with Small Telescopes without Driving-Clocks [PDF]

, 1896
Joseph Lunt
openalex   +1 more source

Redshift‐Agnostic Machine Learning Classification: Unveiling Peak Performance in Galaxy, Star, and Quasar Classification (Using SDSS DR17)

Astronomische Nachrichten, EarlyView.
ABSTRACT Classification of galaxies, stars, and quasars using spectral data is fundamental to astronomy, but often relies heavily on redshift. This study evaluates the performance of 10 machine learning algorithms on SDSS data to classify these objects, with a particular focus on scenarios where redshift information is unavailable.
Debashis Chatterjee, Prithwish Ghosh
wiley   +1 more source

Note with respect to the Invention of the Achromatic Telescope [PDF]

, 1886
A. C. Ranyard
openalex   +1 more source

Gaia Search for Stellar Companions of TESS Objects of Interest V

Astronomische Nachrichten, EarlyView.
ABSTRACT In this paper, we present the latest results of our ongoing multiplicity survey of (Community) TESS Objects of Interest, using astrometry and photometry from the latest data release of the ESA Gaia mission to detect stellar companions of these stars and to characterize their properties.
Markus Mugrauer, Ann‐Kathrin Kollak, Lara Pietsch, Kai‐Uwe Michel   +3 more
wiley   +1 more source

Errata [On the worthlessness of a proposed form of telescope]

, 1898
J. M. Schæberle
openalex   +1 more source

Uncertainties in Ground‐Based Visual Double Star Measures—II Accuracy of Measures

Astronomische Nachrichten, EarlyView.
ABSTRACT Letchford and White 2025, Paper I, determined the uncertainties in ground‐based historic measures of double stars. In this paper, the accuracy of 26,205 ground‐based measures of 857 visual double stars, made since ∼$$ \sim $$1780, is determined relative to space‐based measures based on positions and proper motion from the HIPPARCOS (via ASCC ...
Graeme L. White, Roderick R. Letchford
wiley   +1 more source

The Turret Telescope

Scientific American, 1912
n ...
openaire   +3 more sources

Design and Analysis of Optical Telescope Subsystem

Havacılık ve Uzay Teknolojileri Dergisi
In the realm of space exploration, there is a notable upsurge in advanced remote imaging systems, particularly in CubeSats, owing to their efficiency and increasing payload capacities.
Alper Şanlı, Tuncay Yunus Erkeç
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