HD 221525

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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
Cercle rouge 100%.svg

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
Distance 330 ± 10 ly
(102 ± 4 pc)
Absolute magnitude (MV) 0.61[3]
Details
Mass 2.25?[2] M
Radius 3.5[2] R
Luminosity 44[2] L
Temperature 8000[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[edit]

References[edit]

  1. ^ a b c d e f g h "HR 8938". SIMBAD Astronomical Database. Retrieved 2012-03-02. 
  2. ^ a b c d e f g 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[edit]

See also[edit]