Results 51 to 60 of about 1,106,314 (231)
An extensive photometric study of the recently discovered intermediate polar V647 Aur (1RXS J063631.9+353537) [PDF]
, 2014 We report the results of photometry of the intermediate polar V647 Aur. Observations were obtained over 42 nights in 2012 and 2013. The total duration of the observations was 246 h. We clearly detected three oscillations with periods of 932.9123+\-0.0011,
Kozhevnikov, V. P.
core +1 more source
Development of a pulsar-based timescale [PDF]
, 2012 Using observations of pulsars from the Parkes Pulsar Timing Array (PPTA) project we develop the first pulsar-based timescale that has a precision comparable to the uncertainties in international atomic timescales.
Bailes, M. +23 more
core +4 more sources
Comprehensive Analyses of PPP-B2b Performance in China and Surrounding Areas
Remote Sensing, 2022 BeiDou Global Navigation Satellite System (BDS-3) provides a regional Precise Point Positioning (PPP) service, called PPP-B2b, for users in China and surrounding areas through B2b signal transmitted from its three geostationary earth orbit (GEO ...
Yan Liu, Cheng Yang, Mengni Zhang
doaj +1 more source
La2010: A new orbital solution for the long term motion of the Earth
, 2011 We present here a new solution for the astronomical computation of the orbital motion of the Earth spanning from 0 to -250 Myr. The main improvement with respect to the previous numerical solution La2004 (Laskar et al.
A. Fienga +50 more
core +3 more sources
Extensive photometry of the intermediate polar MU Cam: detection of a spin period change [PDF]
, 2016 Intermediate polars with known rates of spin period changes are not numerous because such tasks require measurements performed for a long time. To measure a spin period change, MU Cam is a good candidate because it has a spin oscillation with a large ...
Kozhevnikov, V. P.
core +1 more source
Remote SensingThis study investigates and verifies the feasibility of the precise point positioning (PPP)-B2b enhanced real-time (RT) precise orbit determination (POD) of low Earth orbit (LEO) satellites.
Yali Shi +5 more
doaj +1 more source
Mathematical Modelling and a Numerical Solution for High Precision Satellite Ephemeris Determination
, 2023 In this paper, we develop a high-precision satellite orbit determination model for satellites orbiting the Earth. Solving this model entails numerically integrating the differential equation of motion governing a two-body system, employing Fehlberg's formulation and the Runge-Kutta class of embedded integrators with adaptive stepsize control.
Gundakaram, Aravind +7 more
openaire +2 more sources
Monthly Notices of the Royal Astronomical Society, 2023 ABSTRACTLow-mass X-ray binaries have long been theorized as potential sources of continuous gravitational-wave radiation, yet there is no observational evidence from recent LIGO/Virgo observing runs. Even for the theoretically ‘loudest’ source, Sco X-1, the upper limit on gravitational-wave strain has been pushed ever lower.
T L Killestein +5 more
openaire +2 more sources
Mercury's resonant rotation from secular orbital elements [PDF]
, 2015 We used recently produced Solar System ephemerides, which incorporate two years of ranging observations to the MESSENGER spacecraft, to extract the secular orbital elements for Mercury and associated uncertainties.
Hussmann, Hauke +2 more
core +2 more sources
Performance Assessment of Non-Integer-Hour Data Blocks in BDS Broadcast Ephemeris
IEEE AccessDue to system anomalies, BeiDou navigation satellite system (BDS) sometimes updates the broadcast ephemeris at non-integral hours. The gross errors contained in the non-integer-hour data blocks of broadcast ephemeris will lead to the signal-in-space (SIS)
Jingjing Wang, Chao Zhou
doaj +1 more source