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- Harju, JormaDepartment of Physics, University of Helsinki, Finland. Max-Planck-Institut für extraterrestrische Physik, Garching, Germany (author)
Radio Interferometric Observation of an Asteroid Occultation
- Article/chapterEnglish2018
Publisher, publication year, extent ...
- 2018-09-14
- University of Chicago Press,2018
- printrdacarrier
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- LIBRIS-ID:oai:DiVA.org:ltu-70978
- https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-70978URI
- https://doi.org/10.3847/1538-3881/aad45bDOI
Supplementary language notes
- Language:English
- Summary in:English
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Notes
- Validerad;2018;Nivå 2;2018-10-03 (marisr)
- The occultation of the radio galaxy 0141+268 by the asteroid(372)Palma on 2017 May 15 was observed using sixantennas of the Very Long Baseline Array(VLBA). The shadow of Palma crossed the VLBA station at Brewster,Washington. Owing to the wavelength used, and the size and the distance of the asteroid, a diffraction pattern in theFraunhofer regime was observed. The measurement retrieves both the amplitude and the phase of the diffractedelectromagnetic wave. This is thefirst astronomical measurement of the phase shift caused by diffraction. Themaximum phase shift is sensitive to the effective diameter of the asteroid. The bright spot at the shadow’s center,the so called Arago–Poisson spot, is clearly detected in the amplitude time-series, and its strength is a goodindicator of the closest angular distance between the center of the asteroid and the radio source. A sample ofrandom shapes constructed using a Markov chain Monte Carlo algorithm suggests that the silhouette of Palmadeviates from a perfect circle by 26±13%. The best-fitting random shapes resemble each other, and we suggesttheir average approximates the shape of the silhouette at the time of the occultation. The effective diameterobtained for Palma, 192.1±4.8 km, is in excellent agreement with recent estimates from thermal modeling ofmid-infrared photometry. Finally, our computations show that because of the high positional accuracy, a singleradio interferometric occultation measurement can reduce the long-term ephemeris uncertainty by an order ofmagnitude.
Subject headings and genre
- TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Annan elektroteknik och elektronik hsv//swe
- ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering hsv//eng
- minor planets
- asteroids: general
- minor planets
- asteroids: individual (372 Palma)
- techniques: interferometric
- Onboard space systems
- Rymdtekniska system
Added entries (persons, corporate bodies, meetings, titles ...)
- Lehtinen, KimmoFinnish Geospatial Research Institute FGI, Masala, Finland (author)
- Romney, JonathanLong Baseline Observatory, Socorro, USA (author)
- Petrov, LeonidAstrogeo Center, Falls Church, USA (author)
- Granvik, MikaelLuleå tekniska universitet,Rymdteknik,Department of Physics, University of Helsinki, Finland(Swepub:ltu)mikgra (author)
- Muinonen, KarriDepartment of Physics, University of Helsinki, Finland. Finnish Geospatial Research Institute FGI, Masala, Finland (author)
- Bach, UweMax-Planck-Institut für Radioastronomie, Bonn, Germany (author)
- Poutanen, MarkkuFinnish Geospatial Research Institute FGI, Masala, Finland (author)
- Department of Physics, University of Helsinki, Finland. Max-Planck-Institut für extraterrestrische Physik, Garching, GermanyFinnish Geospatial Research Institute FGI, Masala, Finland (creator_code:org_t)
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- In:Astronomical Journal: University of Chicago Press156:4, s. 1-100004-62561538-3881
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