Upsilon Herculis

Upsilon Herculis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Hercules
Right ascension 16h 02m 47.89764s[1]
Declination +46° 02′ 12.1371″[1]
Apparent magnitude (V) 4.74[2]
Characteristics
Spectral type B9 III[3]
U−B color index −0.32[2]
B−V color index −0.11[2]
Astrometry
Radial velocity (Rv)+4.1±0.5[4] km/s
Proper motion (μ) RA: +55.42[1] mas/yr
Dec.: −61.29[1] mas/yr
Parallax (π)8.78 ± 0.18 mas[1]
Distance371 ± 8 ly
(114 ± 2 pc)
Absolute magnitude (MV)0.32[5]
Details
Radius4.0[6] R☉
Luminosity173[7] L☉
Surface gravity (log g)3.80[8] cgs
Temperature10,152[7] K
Metallicity [Fe/H]−0.30[8] dex
Rotational velocity (v sin i)7.5[4] km/s
Age254[5] Myr
Other designations
υ Her, 6 Her, BD+46° 2142, HD 144206, HIP 78592, HR 5982, SAO 45865.[9]
Database references
SIMBADdata

Upsilon Herculis (υ Her) is a solitary[10] star in the constellation Hercules. It is visible to the naked eye with an apparent visual magnitude of 4.74.[2] Based upon an annual parallax shift of 8.78 mas as seen from Earth, it is located around 371 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.09 due to interstellar dust.[5]

At an estimated age of 254 million years,[5] this appears to be an evolved B-type giant star with a stellar classification of B9 III.[3] It is a mercury-manganese chemically peculiar star, indicating the spectrum shows abnormal abundances of these elements.[4] The star has about four times the radius of the Sun and it radiates 173[7] times the Sun's luminosity from its photosphere at an effective temperature of 10,152 K.[7]

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Adelman2006 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference PasinettiFracassini2001 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Smith1993 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).