Logo
Unionpedia
Communication
Get it on Google Play
New! Download Unionpedia on your Android™ device!
Free
Faster access than browser!
And Ads-free!

9 Boötis

9 Boötis is a variable star in the constellation Boötes. [1]

13 relations: Apparent magnitude, Boötes, Bright Star Catalogue, Constellation, Durchmusterung, Giant star, Henry Draper Catalogue, Hipparcos, Irregular variable, Light-year, Smithsonian Astrophysical Observatory Star Catalog, Stellar classification, Variable star.

Apparent magnitude

The apparent magnitude (m) of a celestial object is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere.

New!!: 9 Boötis and Apparent magnitude · See more »

Boötes

Boötes is a constellation in the northern sky, located between 0° and +60° declination, and 13 and 16 hours of right ascension on the celestial sphere.

New!!: 9 Boötis and Boötes · See more »

Bright Star Catalogue

The Bright Star Catalogue, also known as the Yale Catalogue of Bright Stars or Yale Bright Star Catalogue, is a star catalogue that lists all stars of stellar magnitude 6.5 or brighter, which is roughly every star visible to the naked eye from Earth.

New!!: 9 Boötis and Bright Star Catalogue · See more »

Constellation

In modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union (IAU).

New!!: 9 Boötis and Constellation · See more »

Durchmusterung

In astronomy, Durchmusterung or Bonner Durchmusterung (BD), is the comprehensive astrometric star catalogue of the whole sky, compiled by the Bonn Observatory (Germany) from 1859 to 1903.

New!!: 9 Boötis and Durchmusterung · See more »

Giant star

A giant star is a star with substantially larger radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature.

New!!: 9 Boötis and Giant star · See more »

Henry Draper Catalogue

The Henry Draper Catalogue (HD) is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension (HDE), published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the Henry Draper Extension Charts (HDEC), published from 1937 to 1949 in the form of charts, which gave classifications for 86,933 more stars.

New!!: 9 Boötis and Henry Draper Catalogue · See more »

Hipparcos

Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.

New!!: 9 Boötis and Hipparcos · See more »

Irregular variable

An irregular variable is a type of variable star in which variations in brightness show no regular periodicity.

New!!: 9 Boötis and Irregular variable · See more »

Light-year

A light-year (abbreviation: ly), sometimes written light year, is a unit of length used informally to express astronomical distances.

New!!: 9 Boötis and Light-year · See more »

Smithsonian Astrophysical Observatory Star Catalog

The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue.

New!!: 9 Boötis and Smithsonian Astrophysical Observatory Star Catalog · See more »

Stellar classification

In astronomy, stellar classification is the classification of stars based on their spectral characteristics.

New!!: 9 Boötis and Stellar classification · See more »

Variable star

A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.

New!!: 9 Boötis and Variable star · See more »

Redirects here:

9 Booetis, 9 Bootis.

References

[1] https://en.wikipedia.org/wiki/9_Boötis

OutgoingIncoming
Hey! We are on Facebook now! »