Active Research

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Measuring the Angular Size of the Sun

Sabatino Sofia, Terry Girard

The balloon-borne Solar Disk Sextant (SDS) experiment has measured the angular size of the Sun on seven occasions spanning the years 1992 to 2011. The solar half-diameter -- observed in a 100-nm wide passband centered at 615 nm -- is found to vary over that period by up to 200 mas, while the typical estimated uncertainty of each measure is 20 mas. The diameter variation appears as if it might be cyclic, although it is not in phase with the solar activity cycle; thus, the measured diameter variation is not an observational artifact of surface activity. Our SDS group is planning future, annual flights over the next three years.

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Image Credits: (header) Image of prominence, SOHO (ESA & NASA)

News

04.01.2014 Congratulations Jeremy Bradford on being awarded the NSF Graduate Research Fellowship!
2014 NSF GRFP Competition Results Announced!
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03.24.2014 Hoffleit Undergraduate Research Scholars
The Astronomy department at Yale is pleased to announce the inaugural Hoffleit Undergraduate Research Scholars have been announced.
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03.09.2014 ALMA study by Yale astronomer Hector Arce is featured in CBS show “60 minutes” report on ALMA.
The prestigious news program “60 Minutes” aired a segment on the Atacama Large Millimeter/sub-millimeter Array (ALMA). Data obtained by Yale astronomy professor Héctor Arce using this powerful new telescope was prominently featured in this report.
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Upcoming Events

Colloquia & Seminars | VIEW ALL

Informal Seminars04.21.2014, 2:00 PM - Gibbs 164
Seminar - Grigor Aslanyan
University of Auckland
Cosmology Seminar: Primordial Perturbations from the CMB

YCAA Seminars04.22.2014, 2:30pm BASS 305
Seminar - Lynne Hillenbrand
Caltech
“The Young and the Restless Stars”

Colloquia04.24.2014, 2:30PM BASS 305
Colloquium - Marc Postman
Space Telescope Science Institute
TBA -Colloquium April 24

YCAA Seminars04.29.2014, 2:30pm BASS 305
Seminar - Daniela Calzetti
UMass Amherst
“Nearby Galaxies: Star Formation in your Neighborhood”

Public Events | VIEW ALL

The Leitner Family Observatory and Planetarium is open every Tuesday night for a planetarium show. Weather permitting there will also be public viewing of planets, nebulae, star clusters and whatever happens to be interesting in the sky. Seats are available on a first come first serve basis. No reservations necessary.
Current updates are posted under the Newsblog and Calendar sections at leitnerobservatory.org

Yale University

© 2014 Yale University. All Rights Reserved.

Yale University

© 2014 Yale University. All Rights Reserved.