Purpose: The residency interview is the most important factor for residency program directors when deciding on how to rank medical student applicants. With the residency match becoming increasingly ...competitive, it is more important than ever for students to perform well in this high-stakes interview. Video-stimulated recall (VSR) has been shown to be an effective tool for facilitating reflection on performance and behaviors. As such, we conducted mock interviews with and without video-stimulated recall to gauge its effect on student perceptions of preparedness and confidence for residency interviews. Methods: Students completed a pre-mock interview survey followed by a video recorded interview with faculty. All students received verbal feedback on their performance immediately after the interview. Students were randomized to receive their feedback from their faculty interviewer either while reviewing their video or without the video review. Post-mock interview and post-residency interview surveys were completed. Wilcoxon signed-rank was used to compare median aggregate scores between pre/post surveys. Wilcoxon rank-sum was used to compare pre/post aggregate scores between the video review vs. no-video review groups. Results: 33 of 70 students participated (47%). 14 students (42%) reviewed their video and 19 (58%) received feedback without video. Likert scores for pre- and post-mock interview and post-residency interview surveys revealed median aggregate scores of 10 (interquartile range, or IQR=8,11), 12 (IQR=12,13), and 13 (IQR=12,13) (p <0.001, p<0.001). The change in median aggregate score between pre/post-mock interview surveys in the video review group vs. no-video review group was 3 (IQR=3,5) and 1 (IQR=0,3) (p<0.01) and from pre-mock interview to post-residency interview in the video review vs. no-video review groups was 3 (IQR=3,5) and 2 (IQR=1,4) (p=0.04). Conclusions: The mock interview for residency application improved students' perceptions of preparedness and confidence. Reviewing the video of the interview while receiving verbal feedback increased students' confidence in their interview skills.
ABSTRACT We report the discovery, tracking, and detection circumstances for 85 trans-Neptunian objects (TNOs) from the first 42 deg2 of the Outer Solar System Origins Survey. This ongoing r-band ...solar system survey uses the 0.9 deg2 field of view MegaPrime camera on the 3.6 m Canada-France-Hawaii Telescope. Our orbital elements for these TNOs are precise to a fractional semimajor axis uncertainty <0.1%. We achieve this precision in just two oppositions, as compared to the normal three to five oppositions, via a dense observing cadence and innovative astrometric technique. These discoveries are free of ephemeris bias, a first for large trans-Neptunian surveys. We also provide the necessary information to enable models of TNO orbital distributions to be tested against our TNO sample. We confirm the existence of a cold "kernel" of objects within the main cold classical Kuiper Belt and infer the existence of an extension of the "stirred" cold classical Kuiper Belt to at least several au beyond the 2:1 mean motion resonance with Neptune. We find that the population model of Petit et al. remains a plausible representation of the Kuiper Belt. The full survey, to be completed in 2017, will provide an exquisitely characterized sample of important resonant TNO populations, ideal for testing models of giant planet migration during the early history of the solar system.
ABSTRACT We report the discovery and orbit of a new dwarf planet candidate, 2015 RR245, by the Outer Solar System Origins Survey (OSSOS). The orbit of 2015 RR245 is eccentric (e = 0.586), with a ...semimajor axis near 82 au, yielding a perihelion distance of 34 au. 2015 RR245 has and absolute magnitude for an assumed albedo of pV = 12%, the object has a diameter of ∼670 km. Based on astrometric measurements from OSSOS and Pan-STARRS1, we find that 2015 RR245 is securely trapped on ten-megayear timescales in the 9:2 mean-motion resonance with Neptune. It is the first trans-Neptunian object (TNO) identified in this resonance. On hundred-megayear timescales, particles in 2015 RR245-like orbits depart and sometimes return to the resonance, indicating that 2015 RR245 likely forms part of the long-lived metastable population of distant TNOs that drift between resonance sticking and actively scattering via gravitational encounters with Neptune. The discovery of a 9:2 TNO stresses the role of resonances in the long-term evolution of objects in the scattering disk and reinforces the view that distant resonances are heavily populated in the current solar system. This object further motivates detailed modeling of the transient sticking population.
The Outer Solar System Origins Survey Bannister, Michele T.; Kavelaars, J. J.; Petit, Jean-Marc ...
The Astronomical journal,
09/2016, Letnik:
152, Številka:
3
Journal Article
Recenzirano
We report the discovery, tracking, and detection circumstances for 85 trans-Neptunian objects (TNOs) from the first 42 square degrees of the Outer Solar System Origins Survey. This ongoing r-band ...solar system survey uses the 0.9 square degree field of view MegaPrime camera on the 3.6 meter Canada-France-Hawaii Telescope. Our orbital elements for these TNOs are precise to a fractional semimajor axis uncertainty of less than 0.1 percent. We achieve this precision in just two oppositions, as compared to the normal three to five oppositions, via a dense observing cadence and innovative astrometric technique. These discoveries are free of ephemeris bias, a first for large trans-Neptunian surveys. We also provide the necessary information to enable models of TNO orbital distributions to be tested against our TNO sample. We confirm the existence of a cold "kernel" of objects within the main cold classical Kuiper Belt and infer the existence of an extension of the "stirred" cold classical Kuiper Belt to at least several au beyond the 2:1 mean motion resonance with Neptune. We find that the population model of Petit et al. remains a plausible representation of the Kuiper Belt. The full survey, to be completed in 2017, will provide an exquisitely characterized sample of important resonant TNO populations, ideal for testing models of giant planet migration during the early history of the solar system.
We report the discovery and orbit of a new dwarf planet candidate, 2015 RR\(_{245}\), by the Outer Solar System Origins Survey (OSSOS). 2015 RR\(_{245}\)'s orbit is eccentric (\(e=0.586\)), with a ...semi-major axis near 82 au, yielding a perihelion distance of 34 au. 2015 RR\(_{245}\) has \(g-r = 0.59 \pm 0.11\) and absolute magnitude \(H_{r} = 3.6 \pm 0.1\); for an assumed albedo of \(p_V = 12\)% the object has a diameter of \(\sim670\) km. Based on astrometric measurements from OSSOS and Pan-STARRS1, we find that 2015 RR\(_{245}\) is securely trapped on ten-Myr timescales in the 9:2 mean-motion resonance with Neptune. It is the first TNO identified in this resonance. On hundred-Myr timescales, particles in 2015 RR\(_{245}\)-like orbits depart and sometimes return to the resonance, indicating that 2015 RR\(_{245}\) likely forms part of the long-lived metastable population of distant TNOs that drift between resonance sticking and actively scattering via gravitational encounters with Neptune. The discovery of a 9:2 TNO stresses the role of resonances in the long-term evolution of objects in the scattering disk, and reinforces the view that distant resonances are heavily populated in the current Solar System. This object further motivates detailed modelling of the transient sticking population.
We report the discovery, tracking and detection circumstances for 85 trans-Neptunian objects (TNOs) from the first 42 deg\(^{2}\) of the Outer Solar System Origins Survey (OSSOS). This ongoing ...\(r\)-band Solar System survey uses the 0.9 deg\(^{2}\) field-of-view MegaPrime camera on the 3.6 m Canada-France-Hawaii Telescope. Our orbital elements for these TNOs are precise to a fractional semi-major axis uncertainty \(<0.1\%\). We achieve this precision in just two oppositions, as compared to the normal 3-5 oppositions, via a dense observing cadence and innovative astrometric technique. These discoveries are free of ephemeris bias, a first for large trans-Neptunian surveys. We also provide the necessary information to enable models of TNO orbital distributions to be tested against our TNO sample. We confirm the existence of a cold "kernel" of objects within the main cold classical Kuiper belt, and infer the existence of an extension of the "stirred" cold classical Kuiper belt to at least several AU beyond the 2:1 mean motion resonance with Neptune. We find that the population model of Petit et al. (2011) remains a plausible representation of the Kuiper belt. The full survey, to be completed in 2017, will provide an exquisitely characterized sample of important resonant TNO populations, ideal for testing models of giant planet migration during the early history of the Solar System.
We report the discovery, tracking, and detection circumstances for 85 trans-Neptunian objects (TNOs) from the first 42 deg(2) of the Outer Solar System Origins Survey. This ongoing r-band solar ...system survey uses the 0.9 deg(2) field of view MegaPrime camera on the 3.6m Canada-France-Hawaii Telescope. Our orbital elements for these TNOs are precise to a fractional semimajor axis uncertainty <0.1%. We achieve this precision in just two oppositions, as compared to the normal three to five oppositions, via a dense observing cadence and innovative astrometric technique. These discoveries are free of ephemeris bias, a first for large trans-Neptunian surveys. We also provide the necessary information to enable models of TNO orbital distributions to be tested against our TNO sample. We confirm the existence of a cold "kernel" of objects within the main cold classical Kuiper Belt and infer the existence of an extension of the "stirred" cold classical Kuiper Belt to at least several au beyond the 2:1 mean motion resonance with Neptune. We find that the population model of Petit et al. remains a plausible representation of the Kuiper Belt. The full survey, to be completed in 2017, will provide an exquisitely characterized sample of important resonant TNO populations, ideal for testing models of giant planet migration during the early history of the solar system.
We report the discovery and orbit of a new dwarf planet candidate, 2015 RR245, by the Outer Solar System Origins Survey (OSSOS). The orbit of 2015 RR245 is eccentric (e = 0.586), with a semimajor ...axis near 82 au, yielding a perihelion distance of 34 au. 2015 RR245 has g - r = 0.59 +/- 0.11 and absolute magnitude H-r = 3.6 +/- 0.1; for an assumed albedo of p(V) = 12%, the object has a diameter of similar to 670. km. Based on astrometric measurements from OSSOS and Pan-STARRS1, we find that 2015 RR245 is securely trapped on ten-megayear timescales in the 9: 2 mean-motion resonance with Neptune. It is the first trans-Neptunian object (TNO) identified in this resonance. On hundred-megayear. timescales, particles in 2015 RR245-like orbits depart and sometimes return to the resonance, indicating that 2015 RR245 likely forms part of the long-lived metastable population of distant TNOs that drift between resonance sticking and actively scattering via gravitational encounters with Neptune. The discovery of a 9: 2 TNO stresses the role of resonances in the long-term evolution of objects in the scattering disk. and reinforces the view that distant resonances are heavily populated in the current solar system. This object further motivates detailed modeling of the transient sticking population.
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