North polar sequence

The North polar sequence is a group of 96 stars that was used to define stellar magnitudes and colors.[1] The cluster of stars lies within two degrees of the Northern Celestial pole.[1] That fact makes them visible to everyone in the northern hemisphere.[2]

Originally proposed by Edward Charles Pickering, the system was used between 1900 and 1950. Today it has been replaced by the UBV photometric system.

See also

References

"North Polar Sequence - Oxford Reference".
"eSky: North Polar Sequence". www.glyphweb.com.

Further reading

C.R. Kitchin (2003). Astrophysical Techniques, Fourth Edition. Taylor & Francis. p. 446. ISBN 978-1-4200-5702-7.

External links

Schematic images

List

Early Late Main sequence O B A F G K M Subdwarf O B WR OB Subgiant Giant Blue Red Yellow Bright giant Supergiant Blue Red Yellow Hypergiant Yellow Carbon S CN CH White dwarf Chemically peculiar Am Ap/Bp CEMP HgMn He-weak Barium Lambda Boötis Lead Technetium Be Shell B[e] Helium Extreme Blue straggler
Remnants	Compact star Parker's star White dwarf Helium planet Neutron Radio-quiet Pulsar Binary X-ray Magnetar Stellar black hole X-ray binary Burster SGR
Hypothetical	Blue dwarf Green Black dwarf Exotic Boson Electroweak Strange Preon Planck Dark Dark-energy Quark Q Black Gravastar Quasi-star Thorne–Żytkow object Iron Blitzar White hole

Nucleosynthesis

Properties

Earth-centric
observations

Related

Category:Stars
Stars portal
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