Results 41 to 50 of about 700 (166)

DETERMINATION OF THE EPHEMERIS ACCURACY FOR AJISAI, LAGEOS AND ETALON SATELLITES, OBTAINED WITH A SIMPLIFIED NUMERICAL MOTION MODEL USING THE ILRS COORDINATES

open access: yesOdessa Astronomical Publications, 2013
This paper describes a simplified numerical model of passive artificial Earth satellite (AES) motion. The model accuracy is determined using the International Laser Ranging Service (ILRS) highprecision coordinates. Those data are freely available on http:
I. V. Kara
doaj   +1 more source

Widespread Higher Soil Respiration Rates at Nighttime Than Daytime Across Global Forest Ecosystems

open access: yesGlobal Change Biology, Volume 32, Issue 3, March 2026.
Soil respiration is the second largest carbon flux between terrestrial ecosystems and the atmosphere, yet its diel dynamics remain poorly understood. By synthesizing continuous, in situ soil respiration measurements from forests worldwide, we reveal widespread higher soil respiration rates at night than during the day.
Heng Huang   +8 more
wiley   +1 more source

Orbits of four double stars [PDF]

open access: yesSerbian Astronomical Journal, 2006
We present orbits of four double stars. Orbits of stars WDS 23516+4205 = ADS 17050 and WDS 18239+5848 = ADS 11336 were calculated for the first time. Orbits of double stars WDS 02022+3643 = ADS 1613 and WDS 18443+3940 = ADS 11635 were revised.
Novaković B., Todorović N.
doaj   +1 more source

A Neural Network Model of Equatorial Electric Field Structures in the Inner Magnetosphere

open access: yesGeophysical Research Letters, Volume 53, Issue 3, 16 February 2026.
Abstract Enabled by state‐of‐the‐art electric field measurements from the Van Allen Probes and careful calibration of the high‐quality data, we developed the first machine‐learning based inner‐magnetosphere electric field model, which covers L = 2.5–6.0 within 20° ${}^{\circ}$ around the magnetic equator.
M. Hua   +6 more
wiley   +1 more source

OBSERVATIONS OF THE MUTUAL PHENOMENA OF THE GALILEAN MOONS IN 2009

open access: yesOdessa Astronomical Publications, 2009
The instrumental and ephemeris preparation for the photometric observations of the mutual phenomena in the system of planetary satellites was conducted within the PHEMU09 project.
N. Koshkin   +10 more
doaj   +1 more source

Confirmation of a Non‐Transiting Planet in the Habitable Zone of the Nearby M Dwarf L 98‐59

open access: yesAstronomische Nachrichten, Volume 347, Issue 2, February 2026.
ABSTRACT Only 40 exoplanetary systems with five or more planets are currently known. These systems are crucial for our understanding of planet formation and planet‐planet interaction. The M dwarf L 98‐59 has previously been found to show evidence of five planets, three of which are transiting.
Paul I. Schwarz   +2 more
wiley   +1 more source

Consistent tidal and rotational models for satellites in synchronous rotation

open access: yesAstronomy & Astrophysics
Tidal dissipation in natural satellites plays a crucial role in shaping their thermal state, internal structure, and evolution; for example, sustaining subsurface oceans in Europa and Enceladus and driving Io’s volcanic activity.
Magnanini Andrea   +2 more
doaj   +1 more source

S/W Development of High Precesion EPHEMERIS(I) [PDF]

open access: yesJournal of Astronomy and Space Sciences, 1993
We developed the S/W which calculate the Planetary and the Moon ephemerides. The ephemeris of the Solar system objects was obtained from a simultaneous numerical integration of the equations of motion for the nine planets and the Moon.
Young-Shoek Ahn   +4 more
doaj  

Les éphémérides nautiques et astronomiques de l’observatoire naval de Lisbonne et de l’observatoire astronomique de l’université de Coimbra, à la fin du XVIIIe siècle

open access: yesCahiers François Viète, 2016
The establishment of scientific education at the University of Coimbra was one of the most important features of the Pombal reform of the university (1772).
Fernando B. Figueiredo
doaj   +1 more source

Hatching Success of Olive Ridley Sea Turtles in Semi‐Natural Nests: A Pilot Assessment of Microclimate Conditions at Batu Hiu Beach

open access: yesEcology and Evolution, Volume 16, Issue 2, February 2026.
Our study investigates the environmental and astronomical drivers of olive ridley (Lepidochelys olivacea) hatching success at Batu Hiu Beach, Indonesia. We demonstrate that air temperature is the dominant predictor of hatching outcomes, while Earth–Moon distance exerts an additional, significant influence independent of humidity and tidal effects ...
Titin Herawati   +3 more
wiley   +1 more source

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