LS I +61 303

LS I +61 303

Observation data Epoch J2000      Equinox J2000
Constellation	Cassiopeia
Right ascension	02h 40m 31.6657s
Declination	+61° 13' 45.604"'
Apparent magnitude (V)	10.8
Characteristics
Spectral type	B0Ve
Variable type	None
Astrometry
Proper motion (μ)	RA: 0.62 mas/yr Dec.: 1.63 mas/yr
Parallax (π)	5.65 ± 2.28 mas
Distance	approx. 600 ly (approx. 180 pc)
Absolute magnitude (MV)	11.4
Other designations
V* V615 Cas, GSC 04047-01917, 1RXS J024033.5+611358, HIC 12469, TYC 4047-1917-1, HIP 12469.

LS I +61 303 is a binary system harboring a compact object and a massive star (possibly a microquasar) that emits HE and VHE (High Energy and Very High Energy) gamma rays. It is only one of three known star systems that produce such energetic rays. The other two systems are PSR B1259-63 and LS 5039.

References

• Paredes et al.; Ribó, Marc; Bosch-Ramon, Valentí; West, Jennifer R.; Butt, Yousaf M.; Torres, Diego F.; Martí, Josep (2007). "Chandra Observations of the Gamma-Ray Binary LS I +61 303: Extended X-Ray Structure?". The Astrophysical Journal Letters 664 (1): L39–L42. Bibcode 2007ApJ...664L..39P. doi:10.1086/520674. http://www.iop.org/EJ/article/1538-4357/664/1/L39/21455.html. 
• Variable Very High Energy Gamma-ray Emission from the Microquasar LS I +61 303
• SCIENCE Journal - Submitted on March 31, 2006 - Accepted on May 8, 2006
  • Variable Very High Energy Gamma-Ray Emission from the Microquasar LS I +61 303 ABSTRACT
• PDF Published online May 18, 2006; 10.1126/science.1128177 (Science Express Reports)
• Variable Very-High-Energy Gamma-Ray Emission from the Microquasar LS I +61 303 SUPPORT

External links

• Astronomers Discovery Very High Energy Gamma-ray Emission From Microquasar (ScienceDaily) May 19, 2006
• MAGIC - Major Atmospheric Gamma Imaging Cerenkov Telescope web site
• MAGIC Telescope home page
• Simbad