HR 8938
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 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 | |
HR 8938 is a subgiant star near the north celestial pole in the constellation Cepheus.[2] At an apparent magnitude of 5.6, it is near the naked eye limit even under very 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
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 "HR 8938". SIMBAD Astronomical Database. Retrieved 2012-03-02.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Jim Kaler. "HR 306 and HR 8938". Stars.astro.illinois.edu. Retrieved 2012-02-29.
- ↑ Jim Kaler. "The Polar Project". University of Illinois. Retrieved 2012-05-02.
- ↑ Calculation:
![({\sqrt[ {5}]{100}})^{{5.56-1.97}}\approx 27.2](/2014-wikipedia_en_all_02_2014/I/media/d/9/4/3/d943dbf2bdf6a82210be614d272a133d.png)
External links
- Labelled image of the region around HR 8938.
- HR 8938 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
See also
- HR 8938 Cephei, Deadmau5 song named after the star
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