38 citations · 108 across the 11 of their papers we have counts for
11 papers
The U.S. Naval Observatory VLBI Spectroscopic Catalog
Remington O. Sexton, Nathan J. Secrest, Megan C. Johnson +1
Despite their importance for astrometry and navigation, the active galactic nuclei (AGNs) that comprise the International Celestial Reference Frame (ICRF) are relatively poorly und…
Substellar Hyades Candidates from the UKIRT Hemisphere Survey
Adam C. Schneider, Frederick J. Vrba, Jeffrey A. Munn +14
We have used data from the UKIRT Hemisphere Survey (UHS) to search for substellar members of the Hyades cluster. Our search recovered several known substellar Hyades members, and t…
FRAMEx II: Simultaneous X-ray and Radio Variability in Active Galactic Nuclei The Case of NGC 2992
Luis C. Fernandez, Nathan J. Secrest, Megan C. Johnson +4
Using simultaneous Very Long Baseline Array and Neil Gehrels Swift Observatory X-ray Telescope observations of the active galactic nucleus (AGN) in NGC 2992 over a six-month observ…
Fundamental Reference AGN Monitoring Experiment (FRAMEx) I: Jumping Out of the Plane with the VLBA
Travis C. Fischer, Nathan J. Secrest, Megan C. Johnson +7
We present the first results from the Fundamental Reference AGN Monitoring Experiment (FRAMEx), an observational campaign dedicated to understanding the physical processes that aff…
The Fundamental Reference AGN Monitoring Experiment (FRAMEx)
B. Dorland, N. Secrest, M. Johnson +6
The U.S. Naval Observatory (USNO), in collaboration with Paris Observatory (OP), is conducting the Fundamental Reference AGN Monitoring Experiment, or FRAMEx. FRAMEx will use USNO'…
The Next Generation Celestial Reference Frame
Megan Johnson, Frank Schinzel, Jeremy Darling +10
Astrometry, the measurement of positions and motions of the stars, is one of the oldest disciplines in Astronomy, extending back at least as far as Hipparchus' discovery of the pre…