Results 31 to 40 of about 200,926 (234)

The three-body problem

, 2014
The three-body problem, which describes three masses interacting through Newtonian gravity without any restrictions imposed on the initial positions and velocities of these masses, has attracted the attention of many scientists for more than 300 years ...
Musielak, Z. E., Quarles, B.
core   +1 more source

Secondary Standards in the UKIRT Faint Standard Fields

The Astrophysical Journal Supplement Series
We present precise J - and K -band photometric measurements for 128 near-infrared (NIR) secondary standard stars, located in the 19 United Kingdom Infrared Telescope/Maunakea Observatories (UKIRT/MKO) primary faint standard fields.
Marek Górski, Grzegorz Pietrzyński, Paulina Karczmarek, Gergely Hajdu, Mirosław Kicia, Mikołaj Kałuszyński, Joseph R. Eimer, Stephen A. Smee, Bartłomiej Zgirski, Piotr Wielgórski, Weronika Narloch   +10 more
doaj   +1 more source

Mutual Impedance Properties in a Lossy Array Antenna

International Journal of Antennas and Propagation, 2019
The impedance matrix of an arbitrary multiport array antenna with Ohmic losses was studied. It was assumed that the partial current distributions in the array, corresponding to the alternate exciting one of its terminals while the other ones are open ...
Peter L. Tokarsky
doaj   +1 more source

Astronomical Characteristics of Cheonsang-yeolcha-bunyajido from the Perspective of Manufacturing Methods [PDF]

Journal of Astronomy and Space Sciences, 2015
I investigated a method for drawing the star chart in the planisphere Cheonsang-yeolcha-bunyajido. The outline of the star chart can be constructed by considering the astronomical information given in the planisphere alone and the drawing method ...
Sang-Hyeon Ahn
doaj   +1 more source

Significance Tests for Periodogram Peaks [PDF]

, 2007
We discuss methods currently in use for determining the significance of peaks in the periodograms of time series. We discuss some general methods for constructing significance tests, false alarm probability functions, and the role played in these by ...
A. Sánchez-Lavega, Apt, Baker, Belton, C.C.C. Tsang, D. Luz, D.L. Berry, Del Genio, Drossart, Egbert, Elson, Fels, Fels, Forbes, G. Piccioni, Gierasch, Grassi, Grassi, Hollingsworth, Holton, Hou, Houghton, Hueso, Ignatiev, Ingersoll, J. Peralta, Jenkins, Kliore, Lebonnois, Lee, Limaye, Limaye, Lindzen, Lindzen, Lindzen, Liu, Luz, Luz, Migliorini, Moissl, Moroz, Newman, Newman, P. Drossart, Pechmann, Peralta, Pollack, Press, Press, R. Hueso, Rossow, Scargle, Schofield, Schofield, Schubert, Seiff, Shen, Smith, Svedhem, Sánchez-Lavega, Sánchez-Lavega, Takagi, Takagi, Taylor, Tellmann, Toigo, Tsang, Volland, Xu, Xu, Yakovlev, Yamamoto, Zasova, Zasova, Zasova   +74 more
core   +3 more sources

Astronomical Research Using Virtual Observatories

Data Science Journal, 2010
The Virtual Observatory (VO) for Astronomy is a framework that empowers astronomical research by providing standard methods to find, access, and utilize astronomical data archives distributed around the world.
M Tanaka, Y Shirasaki, M Ohishi, Y Mizumoto, S Kawanomoto, N Yasuda, S Honda   +6 more
doaj   +1 more source

The astronomical significance of the clockwise misalignment from cardinal directions in the Maya lowlands [PDF]

Archaeoastronomy and Ancient Technologies, 2014
In this paper we outline the results of our archaeoastronomical study dealing with a number of Mayan settlements located in the lowlands of Campeche, Yucatan and Quintana Roo (Mexico), in order to try to explain the well- known clockwise misalignments ...
Motta, S., Gaspani, A.
doaj   +1 more source

GRRIS: A Real-time Intrasite Observation Scheduling Scheme for Distributed Survey Telescope Arrays

The Astronomical Journal
The distributed telescope array offers promise for conducting large-sky-area, high-frequency time-domain surveys. Multiple telescopes can be deployed at each observation site, so intrasite observation task scheduling is crucial for enhancing observation ...
Yajie Zhang, Ce Yu, Chao Sun, Yi Hu, Zhaohui Shang, Jizeng Wei, Xu Yang   +6 more
doaj   +1 more source

Some statistical and computational challenges, and opportunities in astronomy [PDF]

, 2004
The data complexity and volume of astronomical findings have increased in recent decades due to major technological improvements in instrumentation and data collection methods.
Babu, G. Jogesh, Djorgovski, S. George
core   +1 more source

Simulations for Planning Next-generation Exoplanet Radial Velocity Surveys

The Astronomical Journal, 2023
Future direct imaging missions similar to the HabEx and LUVOIR mission concepts aim to catalog and characterize Earth-mass analogs around nearby stars.
Patrick D Newman, Peter Plavchan, Jennifer A. Burt, Johanna Teske, Eric E. Mamajek, Stephanie Leifer, B. Scott Gaudi, Gary Blackwood, Rhonda Morgan   +8 more
doaj   +1 more source