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Jesse L. Greenstein
 
 
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Jesse Leonard Greenstein (October 15 1909 – October 21 2002) was an American astronomer
Astronomer

An astronomer is a scientist who studies Celestial body such as planets, stars, and Galaxy.Historically, astronomy was more concerned with the classification and description of phenomena in the sky, while astrophysics attempted to explain these phenomena and the differences between them using physical laws....
.

He began his career at Yerkes Observatory
Yerkes Observatory

Yerkes Observatory, which calls itself "the birthplace of modern astrophysics,", is an Observatory#Astronomical_observatories operated by the University of Chicago in Williams Bay, Wisconsin....
 under Otto Struve
Otto Struve

----Otto Struve was a Ukraine - Russian-United States astronomer. In Russian, his name is sometimes given as Otto Lyudvigovich Struve ; however, he spent most of his life and his entire scientific career in the United States....
 and later went to Caltech
California Institute of Technology

The California Institute of Technology is a private university research university located in Pasadena, California, United States. Caltech maintains a strong emphasis on the natural sciences and engineering....
. With Louis G. Henyey
Louis G. Henyey

Louis George Henyey was an American astronomer.His parents, Albert and Mary Henyey, were immigrants from Hungary. Louis George Henyey married Elizabeth Rose Belak, born in Budapest, on April 28, 1934; they had three children: Thomas Louis, Francis Stephen, and Elizabeth Maryrose....
 he invented a new spectrograph and a wide-field camera. He directed the Caltech astronomy program until 1972 and later did classified work on military reconnaissance satellites.

With Leverett Davis, Jr, he demonstrated in 1949 that the magnetic field in our galaxy is aligned with the spiral arms. His theoretical work, with Davis, was based the conclusion just reached by William A.






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Jesse Leonard Greenstein (October 15 1909 – October 21 2002) was an American astronomer
Astronomer

An astronomer is a scientist who studies Celestial body such as planets, stars, and Galaxy.Historically, astronomy was more concerned with the classification and description of phenomena in the sky, while astrophysics attempted to explain these phenomena and the differences between them using physical laws....
.

He began his career at Yerkes Observatory
Yerkes Observatory

Yerkes Observatory, which calls itself "the birthplace of modern astrophysics,", is an Observatory#Astronomical_observatories operated by the University of Chicago in Williams Bay, Wisconsin....
 under Otto Struve
Otto Struve

----Otto Struve was a Ukraine - Russian-United States astronomer. In Russian, his name is sometimes given as Otto Lyudvigovich Struve ; however, he spent most of his life and his entire scientific career in the United States....
 and later went to Caltech
California Institute of Technology

The California Institute of Technology is a private university research university located in Pasadena, California, United States. Caltech maintains a strong emphasis on the natural sciences and engineering....
. With Louis G. Henyey
Louis G. Henyey

Louis George Henyey was an American astronomer.His parents, Albert and Mary Henyey, were immigrants from Hungary. Louis George Henyey married Elizabeth Rose Belak, born in Budapest, on April 28, 1934; they had three children: Thomas Louis, Francis Stephen, and Elizabeth Maryrose....
 he invented a new spectrograph and a wide-field camera. He directed the Caltech astronomy program until 1972 and later did classified work on military reconnaissance satellites.

With Leverett Davis, Jr, he demonstrated in 1949 that the magnetic field in our galaxy is aligned with the spiral arms. His theoretical work, with Davis, was based the conclusion just reached by William A. Hiltner that the recently detected polarization of starlight was due to scattering off interstellar dust grains aligned by a magnetic field.

Greenstein did important work in determining the abundances of the elements
Chemical element

A chemical element is a type of atom that is distinguished by its atomic number; that is, by the number of protons in its atomic nucleus. The term is also used to refer to a pure chemical Chemical substance composed of atoms with the same number of protons....
 in stars, and was, with Maarten Schmidt
Maarten Schmidt

Maarten Schmidt is a Netherlands astronomer who measured the distances of astronomical objects called quasars.Schmidt was born in Groningen , and studied with Jan Hendrik Oort....
, the first to recognize quasar
Quasar

A Quasi-stellar radio source is a powerfully energetic and distant active galactic nucleus. Quasars were first identified as being high redshift sources of electromagnetic energy, including radio frequency and visible spectrum, that were point-like, similar to stars, rather than extended sources similar to galaxy....
s as compact, very distant sources as bright as a galaxy. The spectra of the first quasars discovered, radio sources 3C 48 and 3C 273, were displaced so far to the red due to their redshifts as to be almost unrecognizable, but Greenstein deciphered 3C 48 shortly before Schmidt, his colleague at the Hale Observatories
Hale Observatories

The Hale Observatories refers to observatories set up by George Ellery Hale, including:* Yerkes Observatory* Mount Wilson Observatory* Palomar Observatory...
 worked out the spectrum of 3C 273.

Honors

Awards
  • Henry Norris Russell Lectureship
    Henry Norris Russell Lectureship

    The Henry Norris Russell Lectureship is awarded each year by the American Astronomical Society in recognition of a lifetime of excellence in astronomical research....
     of the American Astronomical Society
    American Astronomical Society

    The American Astronomical Society is a United States society of professional astronomy and other interested individuals, headquartered in Washington, DC....
     (1970)
  • Bruce Medal
    Bruce Medal

    The Catherine Wolfe Bruce Gold Medal is awarded every year by the Astronomical Society of the Pacific for outstanding lifetime contributions to astronomy....
     (1971)
  • Gold Medal of the Royal Astronomical Society
    Gold Medal of the Royal Astronomical Society

    The Gold Medal is the highest award of the Royal Astronomical Society....
     (1975)
Named after him
  • Asteroid
    Asteroid

    Asteroids, sometimes called minor planets or planetoids, are small Solar System bodies in orbit around the Sun, smaller than planets but larger than meteoroids....
     4612 Greenstein
    4612 Greenstein

    4612 Greenstein is a Main-belt Asteroid discovered on May 2, 1989 by E. F. Helin at Palomar Observatory.External links ...


External links