Epoch J2000.0 Equinox J2000.0
|Right ascension||11h 24m 17.358s|
|Declination||-01° 31′ 44.674″|
|Apparent magnitude (V)||+9.10|
|B−V color index||+0.87|
|Proper motion (μ)||RA: -179.71 mas/yr
Dec.: -160.61 mas/yr
|Parallax (π)||16.54 ± 1.31 mas|
|Absolute magnitude (MV)||+5.19|
|Metallicity||2.07 × Sun|
HD 99109 is an orange dwarf star approximately 197 light-years away 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.
Planetary system 
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.
(in order from star)
|b||>0.502 ± 0.070 MJ||1.105 ± 0.065||439.3 ± 5.6||0.09 ± 0.16||—||—|
- Butler et al.; Wright, J. T.; Marcy, G. W.; Fischer, D. A.; Vogt, S. S.; Tinney, C. G.; Jones, H. R. A.; Carter, B. D. 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.
- 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
- "Notes for star HD 99109". The Extrasolar Planets Encyclopedia. Retrieved 2008-07-16.
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