Also called: Hematoma, Hemorrhage. Bleeding is the loss of blood. It can happen inside or outside the body. Bleeding can be a reaction to a cut or other wound. It can also result from an injury to internal organs.
Altair or Alpha Aquilae (Alp Aql) is the brightest naked eye star in the constellation Aquila. With an apparent magnitude of 0.76v, Altair is the 12th brightest star in the entire sky (see: 50 Brightest Stars). Its absolute magnitude is 2.2 and its distance is 16.8 light years. The Equinox J2000 equatorial coordinates are RA = 19h 50m 47.0s, Dec = +08Â° 52' 06. Altair has a spectral type of A7V, a surface temperature of 7500Â° Kelvin and a luminosity 10.6 times the Sun.
Absolute magnitude measures the intrinsic brightness of a celestial object rather than how bright it appears on Earth, using the same logarithmic scale as for apparent magnitude. Sirius has an absolute magnitude of 1.5, considerably dimmer than Rigel which, though its apparent magnitude is 0.12, has an absolute magnitude of -8.1. Stars that appear dim in the night sky but have bright absolute magnitudes are much farther from Earth than stars that shine brightly at night but have relatively dim absolute magnitudes.