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Constraints on the Density and Internal Strength of 1I/'Oumuamua
- Publication Year :
- 2018
-
Abstract
- 1I/'Oumuamua was discovered by the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS 1) on 19 October 2017. Unlike all previously discovered minor planets this object was determined to have eccentricity $e > 1.0$, suggesting an interstellar origin. Since this discovery and within the limited window of opportunity, several photometric and spectroscopic studies of the object have been made. Using the measured light curve amplitudes and rotation periods we find that, under the assumption of a triaxial ellipsoid, a density range $1500 < ��< 2800$ kg m$^{-3}$ matches the observations and no significant cohesive strength is required. We also determine that an aspect ratio of $6\pm 1:1$ is most likely after accounting for phase-angle effects and considering the potential effect of surface properties. This elongation is still remarkable but less than some other estimates.<br />8 pages; accepted for publication in ApJL
- Subjects :
- Physics
Earth and Planetary Astrophysics (astro-ph.EP)
010504 meteorology & atmospheric sciences
Aspect ratio
media_common.quotation_subject
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics
Light curve
Rotation
01 natural sciences
law.invention
Telescope
Amplitude
Space and Planetary Science
Asteroid
law
0103 physical sciences
Range (statistics)
Eccentricity (behavior)
010303 astronomy & astrophysics
0105 earth and related environmental sciences
media_common
Astrophysics - Earth and Planetary Astrophysics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....0b201848cd31bf0b6c9d9ddb54615b07