89 Herculis
| 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 | |
| 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
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "SIMBAD query result:V* V441 Her -- Semi-regular pulsating Star". Centre de Données astronomiques de Strasbourg. Retrieved 2010-09-29.
- ↑ 2.0 2.1 2.2 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.
- ↑ 3.0 3.1 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.
- ↑ 4.0 4.1 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
- ↑ 5.0 5.1 Professor James B. (Jim) Kaler. "89 HER (89 Herculis)". University of Illinois. Retrieved 2010-09-29.
- ↑ 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.
- ↑ "Bright Star Catalogue (Hoffleit+, 1991)". VizieR (5th Revised ed.). Centre de Données astronomiques de Strasbourg. Retrieved 2010-09-26.
External links
- Jim Kaler's Stars, University of Illinois: 89 HER (89 Herculis)
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