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5 Persei

5 Persei
Location of 5 Persei (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Perseus
Right ascension 02h 11m 29.19322s[1]
Declination +57° 38′ 43.9634″[1]
Apparent magnitude (V) +6.35[2]
Characteristics
Spectral type B5 Ia[3]
U−B color index −0.45[2]
B−V color index +0.33[2]
Variable type suspected[4]
Astrometry
Radial velocity (Rv)−34.1±0.9[5] km/s
Proper motion (μ) RA: −0.540[1] mas/yr
Dec.: −0.675[1] mas/yr
Parallax (π)0.4174 ± 0.0397 mas[1]
Distance2950+388
−340[6] pc
Absolute magnitude (MV)−6.7[7]
Details
Radius79.93+5.89
−5.38[1] R☉
Luminosity83,000[8] L☉
Surface gravity (log g)2.00[8] cgs
Temperature15,000[8] K
Rotational velocity (v sin i)30[8] km/s
Other designations
5 Per, NSV 15451, BD+56°438, FK5 1054, HD 13267, HIP 10227, HR 627, SAO 23011, WDS J02115+5739[9]
Database references
SIMBADdata

5 Persei is a star in the northern constellation of Perseus located around 2,950 parsecs (9,600 ly) away from the Sun.[6] It is part of the Perseus OB1 stellar association and lies near the Double Cluster. This object is near the lower limit of visibility to the naked eye with an apparent visual magnitude of +6.35.[2] It is moving closer to the Earth with a heliocentric radial velocity of −34 km/s.[5]

A light curve for 5 Persei, plotted from Hipparcos data[10]

This is a blue supergiant of spectral type B5 Ia; a massive star that has used up its core hydrogen and expanded into a very luminous star. It has an effective temperature around 15,000 K and is radiating 83,000 times the Sun's luminosity.[8] Several studies of 5 Persei have detected possible small amplitude variations. In 1983, an amplitude of 0.045 magnitudes was measured with a possible period of eight days.[7] An analysis of Hipparcos photometry showed an amplitude of 0.0168 magnitudes and a period of 2.65 days. The statistical signal was strong enough for the variability to be very likely, but 5 Persei has not formally been catalogued as a variable star.[11]

5 Persei has two nearby companions, a 12th magnitude star 5.7 arc-seconds away and a 13th magnitude star one arc-minute away.[12]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference ducati was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference grenier was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference dist was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference percy was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference mcerlean was invoked but never defined (see the help page).
  9. ^ "5 Per". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-27.
  10. ^ Cite error: The named reference HIPCurve was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference koen was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference wds was invoked but never defined (see the help page).
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