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Solar astrometry with planetary transits

Published online by Cambridge University Press:  24 September 2020

Marcelo Emilio Open the ORCID record for Marcelo Emilio [Opens in a new window] ,
Rock Bush ,
Jeff Kuhn  and
Isabelle Scholl
Marcelo Emilio
Affiliation:
Universidade Estadual de Ponta Grossa, 84030-900 Ponta Grossa, PR, Brazil Observatório Nacional, MCTIC, 20921-400 Rio de Janeiro, RJ, Brazil email: [email protected] Institute for Astronomy, University of Hawaii, Maui, HI 96768, USA emails: [email protected], [email protected]
Rock Bush
Affiliation:
Stanford University, Stanford, CA, 94305, USA email: [email protected]
Jeff Kuhn
Affiliation:
Institute for Astronomy, University of Hawaii, Maui, HI 96768, USA emails: [email protected], [email protected]
Isabelle Scholl
Affiliation:
Institute for Astronomy, University of Hawaii, Maui, HI 96768, USA emails: [email protected], [email protected]
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Abstract

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Planetary transits are used to measure the solar radius since the beginning of the 18th century and are the most accurate direct method to measure potentially long-term variation in the solar size. Historical measures present a range of values dominated by systematic errors from different instruments and observers. Atmospheric seeing and black drop effect contribute as error sources for the precise timing of the planetary transit ground observations. Both Solar and Heliospheric Observatory (SOHO) and Solar Dynamics Observatory (SDO) made observations of planetary transits from space to derive the solar radius. The International Astronomical Union approved the resolution B3 in 2015, defining a nominal solar radius of precisely 695,700 km. In this work, we show that this value is off by more than 300 km, which is one order of magnitude higher than the error of the most recent solar radius observations.

Keywords

Sun: fundamental parametersSun: photosphereSun: activity
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S354: Solar and Stellar Magnetic Fields: Origins and Manifestations , June 2019 , pp. 481 - 493
Copyright
© International Astronomical Union 2020

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