Temperature

• The temperature of specific stars can vary greatly, but all Class F stars fall within the temperature range of 6000 to 7500 Kelvin (5726.85 to 7226.85 C or 10340.33 to 13040.33 F.) The specific temperature will depend on how far into its life cycle the star is and how much mass it has, and will also determine the exact color that the star appears to be.
  
  

Mass

• The mass of a Class F star falls between 1.04 and 1.4 units of solar mass (2.0696000000000002^27 to 2.786^27 metric tons or 2.2813434890891134^27 to 3.071039312235345^27 tons). The mass of the star will determine how long the star will be able to continue burning, as well as how long it will be before the star moves to a different classification, because a good majority of the star's mass will be consumed as fuel while the star continues to burn.
  
  

Color

• The color of a Class F classification for a star is broken into two parts: the star's apparent color, and its conventional color. The apparent color of a Class F star is white and is the color that the star appears to be when viewed with binoculars or on a dark night when no other references can be seen. The conventional color of a Class F star is a more yellowed white, the color that the star appears to be when compared to the star Vega (which appears to be white when viewed with the naked eye.) Older astronomy texts make use of conventional colors, so both are taken into consideration when classifying stars to ensure that the stars haven't been identified already using a conventional method.
  
  

Radius

• Because Class F stars have different masses and burn at different temperatures, the radius of these stars can vary somewhat. The radius of a Class F star is between 1.15 and 1.4 solar radii (a solar radius is based upon the radius of the sun and is the equivalent of 6.960 by 10^8 m). As a star burns more of its fuel, the solar radius will actually begin to expand; this eventually can lead to the creation of red giant stars (though they are obviously not still considered to be Class F at that point).
  
  

Rarity

• Though a good number of stars in the sky at night might appear to fall within the color range of a Class F star, a very low percentage of the stars within viewing distance of the Earth are actually within that classification. Approximately 3 percent of stars are Class F stars, with the majority of stars being cooler and older than Class F stars (and less than 1 percent combined falling into the three classifications that are hotter than Class F).