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type I supernova
subject			fact

type I supernova	has frequency less common than type II supernova
	has absolute magnitude Mv = -14 to -17
	has spectra nonhydrogen lines
	has ejecta velocity 10000 km s-1
	has mass lower than type II supernova
	has location spiral and elliptical galaxies
	has definition A gigantic stellar explosion in which the star's luminosity suddenly increases by as much as a billion times. Most of the star's substance is blown off, leaving behind, at least in some cases, an extremely dense core which may be a neutron star.
	has definition A supernova which may be produced by the thermonuclear detonation of a highly degenerate core produced by mass transfer from a companion star.
	is a kind of supernova
supernova	has energy release 1049 to 1051 ergs
	has use supernova peak brightness distance determination
	has peak brightness 108 solar luminosity units
emission line star	has emission line
cataclysmic variable	has synonym eruptive variable
	has synonym explosive variable
	has recovery time
	has outburst start time
	has acronym CV
star	has star surface temperature
	has spectral type
	has V magnitude
	has B magnitude
	has U magnitude
	has position on celestial sphere from the point of view of Earth
	has parallax from the point of view of Earth's orbit
	has proper motion
	has radiation at surface which is diffused out from the hotter core
	has energy source gravitational contraction and or fusion
	has energy production which takes place primarily within the core
	has surface density which depends on luminosity class
	has surface temperature greater than 1000 Kelvin
	has apparent magnitude
	has age
	has catalog star catalog
	has material hydrogen, helium
	has velocity determined from proper motion and radial velocity
variable	has name designated with R, S, T, U, V, W, X, Y, or Z and the genitive of the latin constellation name RR, RS, RT, RU, RV, RW, RX, RY, or RZ and the genitive of the latin constellation name when the single letter designations are exhausted AA...AZ, BB...BZ, etc. (omitting J), which ends with QQ...QZ and the genitive of the latin constellation namewhen the RR...RZ designations are exhausted V 335, V 336, etc., when the double letter designations are exhausted
	has observational problem some difficulty in distinguishing between various kinds
	has observable variation time scale within a period of decades
	has light curve
	has optical brightness variation 0.2 magnitudes or greater
	has amplitude
physical object	has angular momentum
	has momentum
	has temperature
	has volume
	has extent

Kinds of type I supernova :

• Kepler's Supernova (2 facts) - A Type I supernova (SN Oph 1604) whose light reached Earth in 1604. If H₀ = 50, then Kepler's supernova is out in the galactic halo at a distance of 12.1 kpc and 1.4 kpc above the galactic plane, according to van den Bergh. Kepler's supernova is the prototype of Type I supernovae; at its brightest it reached an apparent magnitude of about -2.2. (3C 358)
• Tycho's star (2 facts) - Remnant of a Type I supernova (B Cas), 3-5 kpc distant, which Tycho observed and described in 1572. At its peak it was as bright as Venus and was visible in the daytime, reaching a magnitude of about -4. It is an X-ray source (2U 0022+63). (3C 10)

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