HD 221525

This article is about the star. For the deadmau5 song named after the star, see HR 8938 Cephei.
HD 221525
Diagram showing star positions and boundaries of the Ursa Minor constellation and its surroundings


Location of HR 8938 (circled)

Observation data
Epoch J2000.0 [1]      Equinox J2000.0 [1]
Constellation Cepheus[2]
Right ascension 23h 27m 00.85s [1]
Declination 87° 18′ 27.02″ [1]
Apparent magnitude (V) 5.56 [1]
Characteristics
Spectral type A7IV[1]
Astrometry
Radial velocity (Rv)-10.9[1] km/s
Parallax (π)9.79 ± 0.35[1] mas
Distance330 ± 10 ly
(102 ± 4 pc)
Absolute magnitude (MV)0.61[3]
Details
Mass2.25?[2] M☉
Radius3.5[2] R☉
Luminosity44[2] L☉
Temperature8000[2] K
Age~900 million[2] years
Other designations
HD 221525, HIP 115746, HR 8938

HD 221525 is a subgiant star near the north celestial pole in the constellation Cepheus.[2] At an apparent magnitude of 5.6, so that it can be seen with the naked eye under dark skies.[1] It is about 30 times fainter than the star Polaris.[NB 1]

HR 8938 is located directly below Polaris on this chart.

Notes

  1. ↑ Calculation: (\sqrt[5]{100})^{5.56-1.97}\approx 27.2

References

  1. 1 2 3 4 5 6 7 8 9 "HR 8938". SIMBAD Astronomical Database. Retrieved 2012-03-02.
  2. 1 2 3 4 5 6 7 Jim Kaler. "HR 306 and HR 8938". Stars.astro.illinois.edu. Retrieved 2012-02-29.
  3. ↑ Jim Kaler. "The Polar Project". University of Illinois. Retrieved 2012-05-02.

External links

See also

This article is issued from Wikipedia - version of the Monday, December 29, 2014. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.