Robert A. Jacobson
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View article: Revised Ephemerides of the Martian Satellites, Phobos and Deimos
Revised Ephemerides of the Martian Satellites, Phobos and Deimos Open
We report on the new ephemerides (MAR099) for the satellites of Mars derived from a large set of ground-based and spacecraft astrometric measurements. Our integrated orbit fit yielded latest estimates for the Martian tidal parameter τ = k …
View article: New Moons of Uranus and Neptune from Ultradeep Pencil-beam Surveys
New Moons of Uranus and Neptune from Ultradeep Pencil-beam Surveys Open
We have conducted extremely ultradeep pencil-beam observations for new satellites around both Uranus and Neptune. Tens of images on several different nights in 2021, 2022, and 2023 were obtained, shifted, and added together to reach as fai…
View article: Post-new-horizons Orbits and Masses for the Satellites of Pluto
Post-new-horizons Orbits and Masses for the Satellites of Pluto Open
We report on ephemerides for the satellites of Pluto based on the large set of astrometric measurements. Our orbit fit yielded the following masses with 1 σ uncertainties: GM Pluto = 869.3 ± 0.4 km 3 s −2 , GM Charon = 106.1 ± 0.3 km 3 s −…
View article: Orbit of the Patroclus–Menoetius Binary System and Predictions for the 2024/2025 Mutual Events Season
Orbit of the Patroclus–Menoetius Binary System and Predictions for the 2024/2025 Mutual Events Season Open
We report on the ephemeris development for Menoetius, the satellite of Patroclus. Our data set consisted of ground–based and Hubble Space Telescope relative astrometry, as well as 42 lightcurves from the mutual events seasons in 2007, 2012…
View article: Evaluation of Parent Reminder-Recall Letters to Promote Human Papillomavirus Vaccination
Evaluation of Parent Reminder-Recall Letters to Promote Human Papillomavirus Vaccination Open
View article: Supplemental Data for Bennu Particle Photometry Analysis
Supplemental Data for Bennu Particle Photometry Analysis Open
This dataset supports the journal article titles "Photometry of particles ejected from active asteroid (101955) Bennu".
View article: The Global Shape, Gravity Field, and Libration of Enceladus
The Global Shape, Gravity Field, and Libration of Enceladus Open
In order to improve our understanding of the interior structure of Saturn's small moon Enceladus, we reanalyze radiometric tracking and onboard imaging data acquired by the Cassini spacecraft during close encounters with the moon. We compu…
View article: Awareness and Acceptance of Primary HPV Testing by Clinician vs Self-Sampling Among Cervical Cancer Screening-Eligible Women
Awareness and Acceptance of Primary HPV Testing by Clinician vs Self-Sampling Among Cervical Cancer Screening-Eligible Women Open
CONTEXT: In 2019, only 73.5% of women were up to date with cervical cancer screening (National Health Interview Survey); lower rates are expected with COVID-related delays. Primary human papillomavirus (HPV) screening is endorsed by the US…
View article: Ephemerides of the Irregular Saturnian Satellites from Earth-based Astrometry and Cassini Imaging*
Ephemerides of the Irregular Saturnian Satellites from Earth-based Astrometry and Cassini Imaging* Open
We report a new determination of the orbits of the irregular Saturnian satellites. We fit their numerically integrated orbits to a data set containing Earth-based observations and imaging data from the Cassini spacecraft. We include the st…
View article: The Orbits of the Main Saturnian Satellites, the Saturnian System Gravity Field, and the Orientation of Saturn’s Pole*
The Orbits of the Main Saturnian Satellites, the Saturnian System Gravity Field, and the Orientation of Saturn’s Pole* Open
Four spacecraft have been sent to investigate the Saturnian system: Pioneer 11, Voyager 1, Voyager 2, and Cassini. By analyzing data acquired with these spacecraft together with Earth-based and Hubble Space Telescope satellite astrometry a…
View article: Tides in the Jovian System
Tides in the Jovian System Open
<p>Tidal interaction is presumed to play a crucial role in the long term evolution<br />of the orbits of the Galilean satellites. Io's active volcanism and associated<br />heat flow are probably driven by tidal dissipatio…
View article: Orbits of the Irregular Satellites of Uranus and Neptune
Orbits of the Irregular Satellites of Uranus and Neptune Open
We report on an ephemerides update for the irregular satellites of Uranus and Neptune, including Nereid. Our data set contains ground-based and Voyager 2 position measurements of the satellites. Some of the new observations were reduced wi…
View article: Photometry of Particles Ejected From Active Asteroid (101955) Bennu
Photometry of Particles Ejected From Active Asteroid (101955) Bennu Open
Near‐Earth asteroid (101955) Bennu is an active asteroid experiencing mass loss in the form of ejection events emitting up to hundreds of millimeter‐ to centimeter‐scale particles. The close proximity of the Origins, Spectral Interpretatio…
View article: Trajectory Estimation for Particles Observed in the Vicinity of (101955) Bennu
Trajectory Estimation for Particles Observed in the Vicinity of (101955) Bennu Open
We analyze the trajectories of 313 particles seen in the near‐Bennu environment between December 2018 and September 2019. Of these, 65% follow suborbital trajectories, 20% undergo more than one orbital revolution around the asteroid, and 1…
View article: Arecibo Radar Astrometry of the Galilean Satellites from 1999 to 2016
Arecibo Radar Astrometry of the Galilean Satellites from 1999 to 2016 Open
Harmon et al. Arecibo radar observations from 1992 provided some of the most precise line-of-sight distance (ranging) measurements of Ganymede and Callisto to date. We report 18 new ranges obtained at Arecibo from 1999 to 2016, among which…
View article: Very Long Baseline Array Astrometry of Cassini: The Final Epochs and an Improved Orbit of Saturn
Very Long Baseline Array Astrometry of Cassini: The Final Epochs and an Improved Orbit of Saturn Open
We report results from multi-epoch radio astrometry of the Cassini spacecraft with the Very Long Baseline Array (VLBA). These observations are part of a program to determine a series of accurate positions for the Saturn system barycenter i…
View article: Episodes of particle ejection from the surface of the active asteroid (101955) Bennu
Episodes of particle ejection from the surface of the active asteroid (101955) Bennu Open
Bennu ejects material from its surface Most asteroids appear inert, but remote observations show that a small number experience mass loss from their surfaces. Lauretta and Hergenrother et al. describe close-range observations of mass loss …
View article: Orbits and resonances of the regular moons of Neptune
Orbits and resonances of the regular moons of Neptune Open
View article: Orbits and resonances of the regular moons of Neptune
Orbits and resonances of the regular moons of Neptune Open
No abstract available.
View article: New Jupiter Satellites and Moon-Moon Collisions
New Jupiter Satellites and Moon-Moon Collisions Open
We report the discovery of 12 new satellites of Jupiter, giving Jupiter 79 known satellites. The new finds are between 23rd-24th mag in the r-band and 1-3 km in diameter assuming dark albedos. Nine of the discoveries are in the distant ret…
View article: The Orbits of Jupiter’s Irregular Satellites
The Orbits of Jupiter’s Irregular Satellites Open
We report on the improved ephemerides for the irregular Jovian satellites. We used a combination of numerically integrated equations of motion and a weighted least-squares algorithm to fit the astrometric measurements. The orbital fits for…
View article: Noncircular features in Saturn’s rings IV: Absolute radius scale and Saturn’s pole direction
Noncircular features in Saturn’s rings IV: Absolute radius scale and Saturn’s pole direction Open
We present a comprehensive solution for the geometry of Saturn's ring system, based on orbital fits to an extensive set of occultation observations of 122 individual ring edges and gaps. We begin with a restricted set of very high quality …
View article: Jupiter spin-pole precession rate and moment of inertia from Juno radio-science observations
Jupiter spin-pole precession rate and moment of inertia from Juno radio-science observations Open
View article: Pluto’s interaction with its space environment: Solar wind, energetic particles, and dust
Pluto’s interaction with its space environment: Solar wind, energetic particles, and dust Open
New Horizons unveils the Pluto system In July 2015, the New Horizons spacecraft flew through the Pluto system at high speed, humanity's first close look at this enigmatic system on the outskirts of our solar system. In a series of papers, …
View article: The geology of Pluto and Charon through the eyes of New Horizons
The geology of Pluto and Charon through the eyes of New Horizons Open
New Horizons unveils the Pluto system In July 2015, the New Horizons spacecraft flew through the Pluto system at high speed, humanity's first close look at this enigmatic system on the outskirts of our solar system. In a series of papers, …
View article: The atmosphere of Pluto as observed by New Horizons
The atmosphere of Pluto as observed by New Horizons Open
New Horizons unveils the Pluto system In July 2015, the New Horizons spacecraft flew through the Pluto system at high speed, humanity's first close look at this enigmatic system on the outskirts of our solar system. In a series of papers, …
View article: The Pluto system: Initial results from its exploration by New Horizons
The Pluto system: Initial results from its exploration by New Horizons Open
New Horizons' views of Pluto The flyby of Pluto and its moon Charon by the New Horizons spacecraft generated news coverage around the world. Now Stern et al. report the first scientific results from the high-speed encounter. The surface of…
View article: Rhea gravity field and interior modeling from Cassini data analysis
Rhea gravity field and interior modeling from Cassini data analysis Open
View article: 3-D Bioprinting: Not Allowed or NOTA Allowed?
3-D Bioprinting: Not Allowed or NOTA Allowed? Open
In 1984, Congress passed the National Organ Transplantation Act (NOTA) to improve the supply of vital human organs. A key provision of NOTA was the prohibition of acquiring, receiving, or otherwise transferring human organs. In effect, thi…