SN 1987A | 1049 to 1051 ergs | | Large Magellanic Cloud | | | greater than 1000 Kelvin | determined from proper motion and radial velocity | type II supernova | 0.01 to 0.05 per year (in our Galaxy) | which depends on luminosity class | 0.2 magnitudes or greater | | | from the point of view of Earth's orbit | | some difficulty in distinguishing between various kinds | from the point of view of Earth | young, massive stars near the edge of spiral arms | | 167000 light years | which is diffused out from the hotter core | CV | | | | hydrogen lines | | | gravitational contraction and or fusion | which takes place primarily within the core | star catalog | | Mv = - 12 to - 13.5 | | | | 108 solar luminosity units | | hydrogen, helium | higher than type II supernova | 5000 km s-1 | | - 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
| within a period of decades | | supernova peak brightness distance determination | explosive variable |