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physical object > natural object > celestial body > star > double star |
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double star | ||||
subject | fact |
double star | has definition A "system" of two stars that appear - because of coincidental alignment when viewed from Earth - to be close together; it is, however, an optical effect only, and therefore not the same as a binary star system (although until the twentieth century there were few means of distinguishing double and binary stars). | ![]() |
is a kind of star | ![]() | |
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 absolute magnitude | ![]() | |
has age | ![]() | |
has catalog star catalog | ![]() | |
has material hydrogen, helium | ![]() | |
has velocity determined from proper motion and radial velocity | ![]() | |
has mass greater than 0.08 the sun's mass | ![]() | |
celestial body | has spectra | ![]() |
physical object | has location or center of gravity | ![]() |
has angular momentum | ![]() | |
has momentum | ![]() | |
has temperature | ![]() | |
has volume | ![]() | |
has extent | ![]() |
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