Shantanu P. Naidu
A5018864042- Astro and Planetary Science
- Planetary Science and Exploration
- Gamma-ray bursts and supernovae
- Isotope Analysis in Ecology
- Geology and Paleoclimatology Research
- Stellar, planetary, and galactic studies
- Space Exploration and Technology
- Geological and Geochemical Analysis
- Geomagnetism and Paleomagnetism Studies
- Space Satellite Systems and Control
- Spacecraft and Cryogenic Technologies
- High-pressure geophysics and materials
- earthquake and tectonic studies
- Space Science and Extraterrestrial Life
- Nuclear Physics and Applications
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Radioactive contamination and transfer
- Spaceflight effects on biology
- Spacecraft Design and Technology
- Scientific Research and Discoveries
- Astronomical Observations and Instrumentation
- Space exploration and regulation
- Atmospheric Ozone and Climate
- Modular Robots and Swarm Intelligence
Jet Propulsion Laboratory
2016-2025
Auburn University
2022
California Institute of Technology
2019
Planetary Science Institute
2015
University of California, Los Angeles
2010-2015
Earth and Space Research
2010
University of Maryland, College Park
2010
Abstract The Double Asteroid Redirection Test (DART) is a Planetary Defense mission, designed to demonstrate the kinetic impactor technique on (65803) Didymos I Dimorphos, secondary of system. DART has four level 1 requirements meet in order declare mission success: (1) impact Dimorphos between 2022 September 25 and October 2, (2) cause at least 73 s change its binary orbit period via impact, (3) measure an uncertainty 7.3 or less, (4) momentum transfer efficiency ( β ) characterize...
Abstract Although no known asteroid poses a threat to Earth for at least the next century, catalogue of near-Earth asteroids is incomplete objects whose impacts would produce regional devastation 1,2 . Several approaches have been proposed potentially prevent an impact with by deflecting or disrupting 1–3 A test kinetic technology was identified as highest-priority space mission related mitigation 1 NASA’s Double Asteroid Redirection Test (DART) full-scale technology. The mission’s target...
Abstract The NASA Double Asteroid Redirection Test (DART) mission performed a kinetic impact on asteroid Dimorphos, the satellite of binary (65803) Didymos, at 23:14 UTC 26 September 2022 as planetary defence test 1 . DART was first hypervelocity experiment an size and velocity scales relevant to defence, intended validate means deflection. Here we report determination momentum transferred by impact. On basis change in orbit period 2 , find instantaneous reduction Dimorphos’s along-track...
Abstract The Double Asteroid Redirection Test (DART) spacecraft successfully performed the first test of a kinetic impactor for asteroid deflection by impacting Dimorphos, secondary near-Earth binary (65803) Didymos, and changing orbital period Dimorphos. A change in approximately 7 min was expected if incident momentum from DART directly transferred to target perfectly inelastic collision 1 , but studies probable impact conditions properties indicated that considerable enhancement ( β )...
Abstract NASA's Double Asteroid Redirection Test (DART) mission was the first to demonstrate asteroid deflection, and mission's Level 1 requirements guided its planetary defense investigations. Here, we summarize DART's achievement of those requirements. On 2022 September 26, DART spacecraft impacted Dimorphos, secondary member Didymos near-Earth binary system, demonstrating an autonomously navigated kinetic impact into with limited prior knowledge for defense. Months subsequent Earth-based...
Abstract The Double Asteroid Redirection Test (DART) mission impacted Dimorphos, the satellite of binary near-Earth asteroid (65803) Didymos, on 2022 September 26 UTC. We estimate changes in orbital and physical properties system due to impact using ground-based photometric radar observations, as well DART camera observations. Under assumption that Didymos is an oblate spheroid, we its equatorial polar radii are 394 ± 11 m 290 16 m, respectively. instantaneously changed along-track velocity...
Abstract Near-Earth Objects (NEOs) are a transient population of small bodies with orbits near or in the terrestrial planet region. They represent mid-stage dynamical cycle asteroids and comets, which starts their removal from respective source regions—the main belt trans-Neptunian scattered disk—and ends as impact planets, disintegrate Sun, ejected solar system. Here we develop new orbital model NEOs by numerically integrating asteroid main-belt sources calibrating results on observations...
The NASA Double Asteroid Redirection Test (DART) spacecraft successfully impacted the Didymos-Dimorphos binary asteroid system on 2022 September 26 UTC. We provide an update to its pre-impact mutual orbit and estimate post-impact physical orbital parameters, derived using ground-based photometric observations taken from July February 2023. found that total change of period was $-33.240 \pm 0.072$ min. (all uncertainties are 3$\sigma$). obtained eccentricity be $0.028 0.016$ apsidal...
Abstract NASA’s Double Asteroid Redirection Test (DART) spacecraft impacted Dimorphos, the natural satellite of (65803) Didymos, on 2022 September 26, as a first successful test kinetic impactor technology for deflecting potentially hazardous object in space. The experiment resulted small change to dynamical state Didymos system consistent with expectations and Level 1 mission requirements. In preencounter paper, predictions were put forward regarding pre- postimpact system. Here we assess...
Abstract With the successful impact of NASA Double Asteroid Redirection Test (DART) spacecraft in Didymos–Dimorphos binary asteroid system, we provide an initial analysis post-impact perturbed dynamics. To compare our simulation results with observations, introduce a set “observable elements” calculated using only physical separation asteroid, rather than traditional Keplerian elements. Using numerical methods that treat fully spin–orbit-coupled dynamics, estimate system’s mass and...
Abstract On 2022 September 26, the Double Asteroid Redirection Test (DART) spacecraft impacted Dimorphos, satellite of binary near-Earth asteroid (65803) Didymos. This demonstrated efficacy a kinetic impactor for planetary defense by changing orbital period Dimorphos 33 minutes. Measuring change relied heavily on coordinated campaign lightcurve photometry designed to detect mutual events (occultations and eclipses) as direct probe satellite’s period. A total 28 telescopes contributed 224...
Abstract On 2022 September 26 (UTC), NASA's Double Asteroid Redirection Test (DART) mission achieved a successful impact on Dimorphos, the secondary component of near-Earth binary asteroid system (65803) Didymos. Subsequent ground-based observations suggest significant reshaping with its equatorial axis ratio changing from 1.06 to ∼1.3. Here we report effects this event Dimorphos's orbit and attitude. Given reported magnitude, our mutual dynamics simulations show that approximately 125 s...
The potentially hazardous asteroid (185851) 2000 DP107 was the first binary near-Earth to be imaged. Radar observations in provided images at 75 m resolution that revealed shape, orbit, and spin-up formation mechanism of binary. made a more favorable flyby Earth 2008, yielding 30 resolution. We used these data obtain shape models for two components improve estimates mutual component masses, spin periods. primary has sidereal period 2.7745 ± 0.0007 hr is roughly spheroidal with an equivalent...
Abstract The NASA Double Asteroid Redirection Test (DART) has demonstrated the capability of successfully conducting kinetic impact-based asteroid deflection missions. changes in Didymos–Dimorphos mutual orbit as a result DART impact have already been measured. To fully assess heliocentric outcome missions, momentum enhancement parameter, β ⊙ , needs to be determined and disentangled from other nongravitational phenomena such Yarkovsky effect. Here we explore measurability resulting DART,...
Abstract The Gaia mission has provided astrometric observations of unprecedented accuracy for more than 156,000 asteroids. reported uncertainties are the order milliarcseconds, about 2 orders magnitude smaller that traditional ground-based observations. data requires a high-fidelity orbit determination process, especially in observation modeling. We present statistical analysis Focused Product Release to test positions and associated uncertainties. find center-of-light offsets due phase...
Abstract We present the results of a fourth planetary defense exercise, focused this time on small near-Earth asteroid (NEA) 2023 DZ2 and conducted during its close approach to Earth in March. The International Asteroid Warning Network (IAWN), with support from NASA's Planetary Defense Coordination Office (PDCO), has been coordinating observational campaigns since 2017 test operational readiness global capabilities. last campaign NEA Apophis, an outcome that exercise was need for short burst...
We develop a fourth-order numerical integrator to simulate the coupled spin and orbital motions of two rigid bodies having arbitrary mass distributions under influence their mutual gravitational potential. dynamics components in well-characterized binary triple near-Earth asteroid systems use surface section plots map possible configurations satellites. For asynchronous satellites, analysis reveals large regions phase space where state satellite is chaotic. synchronous we show that libration...