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Collection:
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NASA Hubble Space Telescope Collection
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NASA Hubble Space Telescope Collection
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Title:
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Astronomers Use Hubble to 'Weigh' Dog Star's Companion
Title
Astronomers Use Hubble to 'Weigh' Dog Star's Companion
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Acknowledgement:
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Acknowledgement
Acknowledgement
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Fast Facts:
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Technical facts about this news release: About the Object Object Name: Sirius A and Sirius B Object Description: Binary Star System Position (J2000): R.A. 06h 45m 08s.92 Dec. -16° 42' 58".0 Constellation: Canis Major Distance: 8.6 light-years away (2.6 parsecs) Dimensions: The projected separation of Sirius A and Sirius B in this image is 6".10, which at the distance of Sirius is 16.1 Astronomical Units (AU). The semimajor axis of the relative orbit is 7".48, or 19.7 AU. About the Data Data Description: The Hubble image was created from HST data from proposal 9964: H. Bond (STScI), M. Barstow and M. Burleigh (University of Leicester), J. Holberg (University of Arizona), and E. Nelan (STScI). I. Hubeny (University of Arizona) and D. Koester (University of Kiel, Germany) are also on the science team. Instruments: WFPC2 STIS Exposure Dates: October 2003 February 2004 Exposure Time: 11.2 min 15.8 min Filter/Gratings: F1042M G430L and G750M About the Image Image Credit: NASA, ESA, H. Bond (STScI) and M. Barstow (University of Leicester) Release Date: December 13, 2005 Orientation: The Dog Star, Sirius, and its Tiny Companion [ http://imgsrc.hubbl…]
Fast_Facts
Technical facts about this news release: About the Object Object Name: Sirius A and Sirius B Object Description: Binary Star System Position (J2000): R.A. 06h 45m 08s.92 Dec. -16° 42' 58".0 Constellation: Canis Major Distance: 8.6 light-years away (2.6 parsecs) Dimensions: The projected separation of Sirius A and Sirius B in this image is 6".10, which at the distance of Sirius is 16.1 Astronomical Units (AU). The semimajor axis of the relative orbit is 7".48, or 19.7 AU. About the Data Data Description: The Hubble image was created from HST data from proposal 9964: H. Bond (STScI), M. Barstow and M. Burleigh (University of Leicester), J. Holberg (University of Arizona), and E. Nelan (STScI). I. Hubeny (University of Arizona) and D. Koester (University of Kiel, Germany) are also on the science team. Instruments: WFPC2 STIS Exposure Dates: October 2003 February 2004 Exposure Time: 11.2 min 15.8 min Filter/Gratings: F1042M G430L and G750M About the Image Image Credit: NASA, ESA, H. Bond (STScI) and M. Barstow (University of Leicester) Release Date: December 13, 2005 Orientation: The Dog Star, Sirius, and its Tiny Companion [ http://imgsrc.hubbl…] Fast Facts
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*Image Type:*: Artwork
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*Image Type:*: Artwork
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*Release Date*:December 13, 2005 09:00 AM (EST)
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*Release Date*:December 13, 2005 09:00 AM (EST)
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*Title*:Astronomers Use Hubble to 'Weigh' Dog Star's Companion
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*Title*:Astronomers Use Hubble to 'Weigh' Dog Star's Companion
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*News Release Number:*: STScI-2005-36c
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*News Release Number:*: STScI-2005-36c
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*Description*:
This picture is an artist's impression showing how the binary star system of Sirius A and its diminutive blue companion, Sirius B, might appear to an interstellar visitor. The large, bluish-white star Sirius A dominates the scene, while Sirius B is the small but very hot and blue white-dwarf star on the right. The two stars revolve around each other every 50 years. White dwarfs are the leftover remnants of stars similar to our Sun. The Sirius system, only 8.6 light-years from Earth, is the fifth closest stellar system known. Sirius B is faint because of its tiny size. Its diameter is only 7,500 miles, slightly smaller than the size of our Earth. The Sirius system is so close to Earth that most of the familiar constellations would have nearly the same appearance as in our own sky. In this rendition, we see in the background the three bright stars that make up the Summer Triangle: Altair, Deneb, and Vega. Altair is the white dot above Sirius A; Deneb is the dot to the upper right; and Vega lies below Sirius B. But there is one unfamiliar addition to the constellations: our own Sun is the second-magnitude star, shown as a small dot just below and to the right of Sirius A.
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*Description*:
This picture is an artist's impression showing how the binary star system of Sirius A and its diminutive blue companion, Sirius B, might appear to an interstellar visitor. The large, bluish-white star Sirius A dominates the scene, while Sirius B is the small but very hot and blue white-dwarf star on the right. The two stars revolve around each other every 50 years. White dwarfs are the leftover remnants of stars similar to our Sun. The Sirius system, only 8.6 light-years from Earth, is the fifth closest stellar system known. Sirius B is faint because of its tiny size. Its diameter is only 7,500 miles, slightly smaller than the size of our Earth. The Sirius system is so close to Earth that most of the familiar constellations would have nearly the same appearance as in our own sky. In this rendition, we see in the background the three bright stars that make up the Summer Triangle: Altair, Deneb, and Vega. Altair is the white dot above Sirius A; Deneb is the dot to the upper right; and Vega lies below Sirius B. But there is one unfamiliar addition to the constellations: our own Sun is the second-magnitude star, shown as a small dot just below and to the right of Sirius A.
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facet_what:
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Sun
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Sun
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Earth
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Earth
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COMPASS
facet_what
COMPASS
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facet_what:
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Canis Major
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Canis Major
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facet_what:
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SIRIUS
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SIRIUS
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ALTAIR
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ALTAIR
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DENEB
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DENEB
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facet_what:
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VEGA
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VEGA
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facet_what:
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Hubble Space Telescope (HST)
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Hubble Space Telescope (HST)
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facet_where:
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Arizona
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Arizona
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Germany
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Germany
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Washington, D.C.
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Washington, D.C.
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February 2004
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February 2004
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October 2003
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October 2003
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December 13, 2005
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December 13, 2005
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2005
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2005
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2004
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2004
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facet_when_year:
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2003
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2003
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UID:
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SPD-HUBBLE-STScI-200 5-36c
UID
SPD-HUBBLE-STScI-200 5-36c
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original url:
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original_url
original url
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Release Date:
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December 13, 2005 09:00 AM (EST)
Release_Date
December 13, 2005 09:00 AM (EST)
Release Date
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