News Release Archive:

News Release 123 of 250

December 13, 2005 09:00 AM (EST)

News Release Number: STScI-2005-36

Astronomers Use Hubble to 'Weigh' Dog Star's Companion

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