|System:||Eta Aquarii - All bodies|
|Distance to Sol:||167.90 ly|
|Spectral Class:||B - Scoopable|
|Luminosity Class:||V - Main-sequence star (dwarf)|
|Age:||336 Million years|
|Surface Temperature:||13,101 K|
Class B stars are very luminous blue-white stars. They range in mass from 2 to 16 solar masses and have a surface temperature reaching 30,000 K. Their lifetimes are shorter than most main sequence stars.
The term dwarf star refers to a variety of distinct classes of stars. The term was originally coined in 1906 when the Danish astronomer Ejnar Hertzsprung noticed that the reddest stars - classified as K and M in the Harvard scheme - could be divided into two distinct groups. They are either much brighter than the Sun, or much fainter. To distinguish these groups, he called them "giant" and "dwarf" stars, the dwarf stars being fainter and the giants being brighter than the sun.