HD 221525

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, SAO 3916
Database references
SIMBADdata

HD 221525 is a subgiant star near the north celestial pole in the constellation Cepheus.[2] At an apparent magnitude of 5.6, 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:

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.

See also

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