89 Herculis

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89 Herculis
Hercules constellation map visualization.PNG
89 Herculis is located just below υ Herculis in Hercules constellation map.
Observation data
Epoch J2000      Equinox J2000
Constellation Hercules
Right ascension 17h 55m 25.1889s[1]
Declination 26° 02′ 59.966″[1]
Apparent magnitude (V) 5.5550[2]
Characteristics
Spectral type F2Ibe[1]
U−B color index +0.27[3]
B−V color index +0.34[3]
Astrometry
Radial velocity (Rv) -28.5[1] km/s
Proper motion (μ) RA: 4.39[1] mas/yr
Dec.: 4.97[1] mas/yr
Parallax (π) .76 ± 0.23[2] mas
Distance approx. 4,000 ly
(approx. 1,300 pc)
Absolute magnitude (MV) -4.49[4]
Details
Radius ~65[5] R
Luminosity 82,00±1100[4] L
Temperature 6800 ± 150[6] K
Metallicity −0.41 Fe/H
Rotational velocity (v sin i) 23[7] km/s
Age ? years
Other designations
89 Her, HR 6685, BD +26° 3120, HD 163506, FK5 1468, HIP 87747, SAO 85545, GC 24382, AAVSO 1751+26
Database references
SIMBAD data
Exoplanet Archive data

89 Herculis is a sixth-magnitude star in the constellation Hercules. Located about 4,000 light years away,[2] it is among a rare class of stars known as yellow supergiants. Although the star's parallax measurement still has a large error factor of ± 1,300ly making the calculation of other stellar parameters difficult, the star is believed to have a radius of 60 R yielding a bolometric luminosity of 7000-9000 L.[5]

See also[edit]

References[edit]

  1. ^ a b c d e f "SIMBAD query result:V* V441 Her -- Semi-regular pulsating Star". Centre de Données astronomiques de Strasbourg. Retrieved 2010-09-29. 
  2. ^ a b c van Leeuwen, F (November 2007). "Hipparcos, the New Reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Retrieved 2010-09-29. 
  3. ^ a b Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewski, W. Z. (1966). "UBVRIJKL photometry of the bright stars.". Comm. Lunar Plan. Lab., 4 (PDF) (SIMBAD). Bibcode:1966CoLPL...4...99J. 
  4. ^ a b Arellano Ferro, A.; Giridhar, S.; Rojo Arellano, E. (April 2003), "A Revised Calibration of the MV-W(O I 7774) Relationship using Hipparcos Data: Its Application to Cepheids and Evolved Stars", Revista Mexicana de Astronomía y Astrofísica 39: 3–15, arXiv:astro-ph/0210695, Bibcode:2003RMxAA..39....3A 
  5. ^ a b Professor James B. (Jim) Kaler. "89 HER (89 Herculis)". University of Illinois. Retrieved 2010-09-29. 
  6. ^ Khalilov, A. M.; Samedov, Z. A.; Hasanova, A. R. (November 2008). "A study of the supergiant 89 Her". Astronomy Reports (PDF) (A&A) 52 (10): 847–851. Bibcode:2008ARep...52..847K. doi:10.1134/S1063772908100077. 
  7. ^ "Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR. Centre de Données astronomiques de Strasbourg. Retrieved 2010-09-26. 

External links[edit]