HD 99109

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HD 99109
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Leo
Right ascension 11h 24m 17.359s[1]
Declination –01° 31′ 44.66″[1]
Apparent magnitude (V) +9.10
Characteristics
Spectral type K0V
B−V color index +0.87
Variable type Suspected
Astrometry
Proper motion (μ) RA: –178.07 ± 1.18[1] mas/yr
Dec.: –159.26 ± 1.11[1] mas/yr
Parallax (π) 20.03 ± 1.38[1] mas
Distance 160 ± 10 ly
(50 ± 3 pc)
Absolute magnitude (MV) +5.19
Details
Mass 0.93 M
Luminosity 0.724 L
Temperature 5272 K
Metallicity 2.07 × Sun
Age >12.2 Gyr
Other designations
BD–00°2437, HIP 55664, SAO 138182
Database references
SIMBAD data

HD 99109 is an orange dwarf star approximately 160 light-years away[1] in the constellation of Leo. The star is though to have about 93% as massive, probably smaller, and 72.4% the luminosity of the Sun. It is over twice the abundance of iron relative to hydrogen than the Sun. The star is one and half degree away from the celestial equator to the south. As of 2006, one extrasolar planet has been confirmed to be orbiting the star.[2]

Planetary system[edit]

The planet HD 99109 b has an orbit comparable in eccentricity to the planet Mars in our solar system but has a mass at least half that of Jupiter. Stability analysis reveals that Earth-size planets could have stable orbits in the planet's Trojan points, located 60 degrees ahead and behind the planet's position in its orbit.[3]

The HD 99109 system[2]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b >0.502 ± 0.070 MJ 1.105 ± 0.065 439.3 ± 5.6 0.09 ± 0.16

References[edit]

  1. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ a b Butler, R. P. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701. 
  3. ^ R. Schwarz, R. Dvorak, Á. Süli, and B. Érdi (November 2007). "Survey of the stability region of hypothetical habitable Trojan planets". Astronomy & Astrophysics 474 (3): 1023–1029. Bibcode:2007A&A...474.1023S. doi:10.1051/0004-6361:20077994. : HD 93083, HD 17051, HD 28185, HD 27442, HD 188015, HD 99109, HD 221287

External links[edit]


Coordinates: Sky map 11h 24m 17.358s, −01° 31′ 44.674″