Results 1 to 10 of about 2,560,429 (374)
An Extreme-precision Radial-velocity Pipeline: First Radial Velocities from EXPRES [PDF]
The Astronomical Journal, 2020 Abstract The EXtreme-PREcision Spectrograph (EXPRES) is an environmentally stabilized, fiber-fed, R = 137,500, optical spectrograph. It was recently commissioned at the 4.3 m Lowell Discovery Telescope near Flagstaff, Arizona. The spectrograph was designed with a target radial-velocity (RV) precision of 30 cm s−1.
Ryan R. Petersburg +15 more
semanticscholar +6 more sources
Automatic Recognition Algorithm of Convergence Region Based on Relative Storm Radial Velocity Field
应用气象学报, 2021 An algorithm for automatically identifying the mid-altitude radial convergence from the storm-relative radial velocity field is proposed. The algorithm first identifies the positive-negative velocity segments in each radial direction on the single ...
Zhu Li, Kang Lan
doaj +1 more source
Precise Radial Velocities and Radial Velocity Standards [PDF]
Symposium - International Astronomical Union, 1985 By imposing absorption lines of HF in stellar spectra we can measure changes in r.v. with a precision of ~10m/s from a single spectrum, provided stellar line profiles are not distorted by atmospheric motions. The precision of absolute radial velocities is currently limited to ~100m/s by knowledge of rest wavelengths.
G. A. H. Walker +3 more
openaire +1 more source
TOI 560: Two Transiting Planets Orbiting a K Dwarf Validated with iSHELL, PFS, and HIRES RVs
The Astronomical Journal, 2022 We validate the presence of a two-planet system orbiting the 0.15–1.4 Gyr K4 dwarf TOI 560 (HD 73583). The system consists of an inner moderately eccentric transiting mini-Neptune (TOI 560 b, $P={6.3980661}_{-0.0000097}^{+0.0000095}$ days, $e={0.294}_{-0.
Mohammed El Mufti +95 more
doaj +1 more source
Correction of Dual-PRF Velocity for Operational S-Band Doppler Weather Radar
Remote Sensing, 2023 The Weather Radar Center (WRC) of the Korea Meteorological Administration (KMA) has been providing three-dimensional radar wind fields based on the “WInd Synthesis System using Doppler Measurements (WISSDOM)” in real time since February 2019.
So-Yeon Park +2 more
doaj +1 more source
Automated Recognition of Macro Downburst Using Doppler Weather Radar
Atmosphere, 2022 In light of the macro downburst’s ground divergent flow field characteristics and high reflectivity, this paper proposes an algorithm for identifying the downburst area using a Doppler weather radar low-level radial velocity and reflectivity factor ...
Xu Wang +4 more
doaj +1 more source
A Study of the Radial Velocity of BX Andromedae [PDF]
Journal of Astronomy and Space Sciences, 2004 High resolution spectroscopic observations of BX And using the BOES (Bohyunsan Optical Echelle Spectrograph) of Bohyunsan Optical Astronomical Observatory (BOAO) were performed during 26-27, Feb. 2003.
Chung-Uk Lee +3 more
doaj +1 more source
Hydrodynamic flow between rotating stretchable disks in an orthotropic porous medium [PDF]
Songklanakarin Journal of Science and Technology (SJST), 2020 A mathematical model of convective steady flow over rotating disks in an orthotropic porous medium has been developed and solved the non-dimentional governing equations for flow by the shooting method that uses fourth order Runge- Kutta integration ...
K. Gowthami +3 more
doaj +1 more source
Research on Tangential Velocity Solution and Accuracy Analysis of Radar Target [PDF]
MATEC Web of Conferences, 2023 In this paper, a calculation method for the tangential velocity solution of radar target based on linear vector method is proposed. It makes full use of the advantage of high precision radial velocity measurement of radar, and realizes the accurate ...
Yin Qi +3 more
doaj +1 more source
Overfitting Affects the Reliability of Radial Velocity Mass Estimates of the V1298 Tau Planets
The Astronomical Journal, 2023 Mass, radius, and age measurements of young (≲100 Myr) planets have the power to shape our understanding of planet formation. However, young stars tend to be extremely variable in both photometry and radial velocity (RV) measurements, which makes ...
Sarah Blunt +25 more
doaj +1 more source