Results 61 to 70 of about 6,726 (227)

Constraining exotrojans in hot-Jupiter systems using transit timing variation observations from TESS

Astronomy & Astrophysics
Context. Co-orbital objects, also known as Trojans, are celestial bodies that share a 1:1 mean motion resonance orbit with a planet. Many planets in our Solar System hold Trojans, yet none has been confirmed in exoplanetary systems.
Zhang Zixin, Wang Wenqin, Ma Xinyue, Chen Zhangliang, Wang Yonghao, Yu Cong, Liu Shangfei, Gao Yang, Tang Baitian, Chen Dichang, Ma Bo   +10 more
doaj   +1 more source

Minor Planet Databases

Open Astronomy, 2015
We cast a retrospective look at the mankind’s acquaintance with minor bodies of the Solar System, at the explosive growth in their discoveries resulting from the technological progress, and at gradual understanding of the danger to our very existence ...
Rykhlova L., Bakanas E.
doaj   +1 more source

Updated Interior Structure of Callisto From a Reanalysis of Galileo Data

Geophysical Research Letters, Volume 53, Issue 15, 16 August 2026.
Abstract The internal structure of Callisto has been a long‐standing question since the Galileo mission. Previous analyses suggested a largely undifferentiated interior. We present an updated interior structure for Callisto derived from a reanalysis of Galileo's Doppler tracking data using new signal processing techniques.
G. Cascioli, F. Petricca, E. Mazarico, D. Buccino, C. Cochrane, J. Castillo‐Rogez   +5 more
wiley   +1 more source

Calculation of the Uncertainties in the Planetary Precessions with the Recent EPM2017 Ephemerides and their Use in Fundamental Physics and Beyond [PDF]

Astronomical Journal, 2018
I tentatively compile the formal uncertainties in the secular rates of change of the orbital elements a, e, I, Ω, and ϖ of the planets of the solar system from the recently released formal errors in a and the nonsingular elements h, k, p, and q estimated
L. Iorio
semanticscholar   +1 more source

Planetary Ephemerides [PDF]

Highlights of Astronomy, 1974
At the present time the planetary ephemerides in the Astronomical Ephemeris and in the American Ephemeris and Nautical Almanac (both hereinafter referred to as the AE), the Astronomical Ephemeris of the U.S.S.R. and most other national almanacs have the following basis: For Mercury, Venus, Earth, and Mars the general theories of Simon Newcomb (1898a ...
R. L. Duncombe, P. K. Seidelmann, P. M. Janiczek   +2 more
openaire   +1 more source

Detecting an Ocean Inside Callisto With Geodetic Measurements From Europa Clipper and Juice

Geophysical Research Letters, Volume 53, Issue 15, 16 August 2026.
Abstract Determining whether Callisto hosts a subsurface ocean, and the implications for material and energy transport through its hydrosphere, is of high interest to NASA's Europa Clipper and ESA's Juice missions. A recent reanalysis of Galileo magnetometer data strengthens the ocean hypothesis, but definitive confirmation awaits new measurements.
Flavio Petricca, Gael Cascioli, Erwan Mazarico   +2 more
wiley   +1 more source

A Discrete Set of Possible Transit Ephemerides for Two Long-period Gas Giants Orbiting HIP 41378 [PDF]

Astronomical Journal, 2018
In 2015, K2 observations of the bright (V = 8.9, K = 7.7) star HIP 41378 revealed a rich system of at least five transiting exoplanets, ranging in size from super-Earths to gas giants.
J. Becker, A. Vanderburg, Joseph E. Rodriguez, M. Omohundro, F. Adams, K. Stassun, X. Yao, J. Hartman, J. Pepper, G. Bakos, G. Barentsen, T. Beatty, W. Bhatti, A. Chontos, A. Cameron, C. Hellier, D. Huber, D. James, R. Kuhn, M. Lund, D. Pollacco, R. Siverd, D. Stevens, José Vinícius de Miranda Cardoso, R. West   +24 more
semanticscholar   +1 more source

4. Ephemerides [PDF]

Transactions of the International Astronomical Union, 1970
The appended reports of the directors of the national ephemeris offices provide a record of the current activity in the publication and preparation of astronomical ephemerides, including those published for use by navigators and surveyors and those prepared for astronomers whose special needs are not met in the printed almanacs.
G. A. Wilkins, J. Kovalevsky, G. M. Clemence, G. A. Chebotarev, R. L. Duncombe, W. Fricke   +5 more
openaire   +1 more source

The ORCA‐TWIN qCMOS Experiment I. Science Case and Commissioning at Calar Alto Observatory

Astronomische Nachrichten, Volume 347, Issue 7, August 2026.
ABSTRACT We describe a pilot study to explore a new generation of fast and low noise CMOS image sensors for time domain astronomy, using two remote telescopes with a baseline of 1635 km. The experiment involves direct imaging with novel qCMOS image sensor technology that combines fast readout with sub‐electron readout noise.
Martin M. Roth, Paško Roje, Stella Vješnica, Stefan Cikota, Alex J. Brown, Mike Kretlow, Marco Azzaro, Santiago Reinhart, Jesús Aceituno, Harry Dawson, Carsten Denker, Torsten Enßlin, Stephan Geier, Thomas Granzer, Thomas Kupfer, Gianluca Li Causi, Samaya Nissanke, José Luis Ortiz, Fernando Pedichini, Katja Poppenhäger, Axel Schwope   +20 more
wiley   +1 more source

Linking ephemeris-derived outgassing forces to surface activity on comet Churyumov/Gerasimenko 67P: A comparative analysis of three post-Rosetta ephemerides

Astronomy & Astrophysics
Context. The non-gravitational acceleration (NGA) of comet 67P/Churyumov-Gerasimenko, primarily driven by outgassing, exhibits pronounced anisotropy due to the nucleus’s highly irregular and strongly asymmetric shape.
Yang Wanling, Yan Jianguo, Chen Min, Barriot Jean-Pierre   +3 more
doaj   +1 more source