Results 31 to 40 of about 228,090 (281)
The stability of the optical flux variation gradient for 3C120
, 2015 New $B$- and $V$-band monitoring in 2014 $-$ 2015 reveals that the Seyfert 1 Galaxy, 3C120, has brightened by a magnitude of $1.4$, compared to our campaign that took place in 2009 $-$ 2010.
Chini, Rolf +4 more
core +1 more source
Ionospheric measurements of relative coronal brightness during the total solar eclipses of 11 August, 1999 and 9 July, 1945 [PDF]
Annales Geophysicae, 2000 Swept-frequency (1-10 MHz) ionosonde measurements were made at Helston, Cornwall (50°06'N, 5°18'W) during the total solar eclipse on August 11, 1999. Soundings were made every three minutes.
C. J. Davis +9 more
doaj +1 more source
UniverseIn terms of the variable nature of normal active galaxy nuclei (AGN) and luminous quasars, a so-called flux variation gradient (FVG) method has been widely utilized to estimate the underlying non-variable host galaxy fluxes.
Minxuan Cai +4 more
doaj +1 more source
TOI-199 b: A Well-characterized 100 day Transiting Warm Giant Planet with TTVs Seen from Antarctica
The Astronomical Journal, 2023 We present the spectroscopic confirmation and precise mass measurement of the warm giant planet TOI-199 b. This planet was first identified in TESS photometry and confirmed using ground-based photometry from ASTEP in Antarctica including a full 6.5 hr ...
Melissa J. Hobson +51 more
doaj +1 more source
Intranight optical variability of radio-quiet BL Lacertae objects
, 2015 Aims: Intranight variation (or microvariation) is a common phenomenon of radio-loud BL Lac objects. However, it is not clear whether the recently found radio-quiet BL Lac objects have the same properties.
Liu, Yuan, Zhang, Jin, Zhang, Shuang Nan
core +1 more source
Remote SensingRobotic Astronomical Observatories (RAOs) have provided very good results in different research projects in astrophysics/astronomy. Their applications in the detection, tracking, and identification of near-Earth objects have contributed to the ...
Francisco Espartero +3 more
doaj +1 more source
An Analysis of the Effect on the Data Processing of Korea GPS Network by the Absolute Phase Center Variations of GPS Antenna [PDF]
Journal of Astronomy and Space Sciences, 2006 The International GNSS Service (IGS) has prepared for a transition from the relative phase center variation (PCV) to the absolute PCV, because the terrestrial scale problem of the absolute PCV was resolved by estimating the PCV of the GPS satellites ...
Jeongho Baek +4 more
doaj +1 more source
A planetary companion around the K giant eps Corona Borealis
, 2012 Aims. Our aim is to search for and study the origin of the low-amplitude and long-periodic radial velocity (RV) variations in K giants. Methods. We present high-resolution RV measurements of K2 giant epsilon CrB from February 2005 to January 2012 using ...
B.-C. Lee +57 more
core +1 more source
Mass-radius relation for magnetized strange quark stars [PDF]
, 2010 We review the stability of magnetized strange quark matter (MSQM) within the phenomenological MIT bag model, taking into account the variation of the relevant input parameters, namely, the strange quark mass, baryon density, magnetic field and bag ...
A. P. MARTÍNEZ +4 more
core +2 more sources
Determining the Rotation Periods of an Inactive LEO Satellite and the First Korean Space Debris on GEO, KOREASAT 1 [PDF]
Journal of Astronomy and Space Sciences, 2016 Inactive space objects are usually rotating and tumbling as a result of internal or external forces. KOREASAT 1 has been inactive since 2005, and its drift trajectory has been monitored with the optical wide-field patrol network (OWL-Net).
Jin Choi +15 more
doaj +1 more source