Results 81 to 90 of about 19,555 (207)

The Solar Lense-Thirring effect: perspectives for a future measurement

, 2016
The predicted Lense-Thirring perihelion precession of Mercury induced by the Sun's angular momentum through its general relativistic gravitomagnetic field amounts to 2 milliarcseconds per century.
Iorio, Lorenzo
core   +1 more source

Reconstructing Historical Solar Indices for Predicting Past Space Weather Events

Space Weather, Volume 24, Issue 4, April 2026.
Abstract Modeling and forecasting the near‐Earth space environment, specifically the thermosphere, is particularly important because it affects the motion of low‐Earth orbit objects through atmospheric drag. Solar indices such as F10.7, S10.7, M10.7, and Y10.7 are commonly used as inputs to ionospheric and thermospheric density models.
Poshan Belbase, Denny M. Oliveira, Theodosios Chatzistergos, Gangkai Poh, Eftyhia Zesta   +4 more
wiley   +1 more source

Boosting decision trees for the selection of main belt asteroids in planetary ephemerides: An alternative model

Astronomy & Astrophysics
Context. One of the main bottlenecks in assessing the accuracy of the Mars orbit is the unknown value of the asteroids in the main asteroid belt. A modeling with 343 asteroids as point masses is used today, with the relative masses fit to observational ...
Mariani Vincenzo, Fienga Agnès, Murray Zachary, Gastineau Mickaël, Laskar Jacques   +4 more
doaj   +1 more source

GSI‐UNet: Extracting Geomagnetic and Solar Indices Features for Real‐Time Global Ionospheric Map Enhancement

Space Weather, Volume 24, Issue 4, April 2026.
Abstract Real‐time Global Ionospheric Map (RT‐GIM) products, provided by the International GNSS Service (IGS), are designed to support time‐sensitive applications by offering ionospheric information with only a few minutes of latency. However, their accuracy falls far short of the high‐precision Final GIM, particularly during periods of intense solar ...
Yonggai Zhuang, Meiling Wang, Haixin Wu
wiley   +1 more source

Lunar reference systems and their realisations using INPOP ephemerides

Astronomy & Astrophysics
Context. The definition of a reference system plays a crucial role in quantifying geodetic effects and in surface body cartography. Today, the development and specification of the lunar reference system is stimulated by future space missions, some of ...
Rambaux N., Fienga A., Seyffert Y., Sośnica K., Kaitheri A., Laskar J., Gastineau M., Baguet D.   +7 more
doaj   +1 more source

Gravitational solution to the Pioneer 10/11 anomaly

, 2005
A fully relativistic modified gravitational theory including a fifth force skew symmetric field is fitted to the Pioneer 10/11 anomalous acceleration. The theory allows for a variation with distance scales of the gravitational constant G, the fifth force
Fischbach E, Fischbach E, J R Brownstein, J W Moffat, Moffat J W, Moffat J W, Nieto M M, Page G L Dixon D S Wallin J F, Reuter M, Turyshev S G Nieto M M Anderson J D, Will C W   +10 more
core   +5 more sources

The Sunspot Catalogues of Carrington, Peters, and de la Rue: Quality Control and Machine-readable Versions

, 2013
In the 19th century, several astronomers made observations of sunspots, recording their positions and sometimes their areas. These observations were published in the form of extensive tables, but have been unhelpful until now.
Casas, R., Vaquero, J. M.
core   +1 more source

On the possibility of measuring the solar oblateness and some relativistic effects from planetary ranging

, 2004
In this paper we first calculate the post-Newtonian gravitoelectric secular rate of the mean anomaly of a test particle freely orbiting a spherically symmetric central mass.
Anderson, Armstrong, Bertotti, Ciufolini, Ciufolini, Ciufolini, Ciufolini, De Sitter, Einstein, Elsworth, Iess, Iorio, Iorio, Iorio, Iorio, Iorio, L. Iorio, Lense, Lucchesi, Mashhoon, Milani, Ni, Nordtvedt, Nordtvedt, Paternó, Pettengill, Pijpers, Pireaux, Pitjeva, Pitjeva, Schiff, Shapiro, Shapiro, Stairs, Turyshev, Vecchiato   +35 more
core   +1 more source

PERIOD CHANGE IN THE CONTACT SYSTEM AW UMA

Odessa Astronomical Publications, 2017
Nine new minima were determined from the UBV photoelectric observations obtained in 1992 and 1995-6. They were used to derive the new ephemerides of AW UMa. The mid-eclipse brightening best visible in U colour was detected.
T. Pribulla, D. Chochol
doaj   +1 more source

A 16-parameter GEO Broadcast Ephemeris [PDF]

Journal of Geodesy and Geoinformation Science, 2018
Currently, the broadcast ephemerides used in GEOs are same as those of the MEOs and IGSOs in the BeiDou navigation constellation. However, a trade-off strategy, i.e.
Zhongkai ZHANG,Lan DU,Li LIU,Feng HE,Yu LU,Peiyuan ZHOU
doaj