LS I +61 303

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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.

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Coordinates: Sky map 02h 40m 31.6657s, +61° 13′ 45.604″