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Bibliographic References compiled from NED, SIMBAD (US Mirror), and ADS This service sends queries to NED and SIMBAD using the object information entered in the form below. It then combines the results and sorts by the number of references held by each service. Links are also provided to the ADS reference holdings for each object. Target name:  RA / L:  Dec / B:  Coordinate System:  J2000 B1950 Galactic View Example Inputs Here: Target name: Cygnus X-1 Equatorial (decimal degrees): 101.295 -16.699 Equatorial (sexagesimal): 6 45 10.8 -16 41 58 Equatorial (sexagesimal): 6 45.18 -16 41.97 Galactic (decimal degrees): 227.22 -8.88 Search Radius('):  HEASARC Home | Observatories | Archive | Calibration | Software | Tools | Students/Teachers/Public

Science Mission Directorate Universe Division Beyond Einstein | Origins FAQ/Comments/Feedback Education Resources Find helper applications like Adobe Acrobat A service of the Astrophysics Science Division at NASA/ GSFC and the High Energy Astrophysics Division of the Smithsonian Astrophysical Observatory (SAO) HEASARC Director: Dr. Alan P. Smale HEASARC Associate Director: Dr. Roger Brissenden Responsible NASA Official: Phil Newman Web Curator: Meredith Gibb Privacy Policy and Important Notices.