HD 219077
A G-type star with a massive, highly eccentric planet.
HD 219077 is a faint, yellow-hued star in the southern constellation of Tucana. With an apparent visual magnitude of +6.12, it lies near the limit of naked-eye visibility. The star is moving closer to the Sun and has a relatively high proper motion.
Quick Facts
- Apparent visual magnitude
- +6.12
- Distance from sun
- 95 light years
- Stellar classification
- G8 V
- Mass
- 1.05 times the Sun's mass
- Radius
- 1.91 times the Sun's radius
- Age
- 8.9 billion years
- Effective temperature
- 5,362 K
Facts from the source article.
Planetary system
The star was observed from 1998 to 2012 with the CORALIE echelle spectrograph at La Silla Observatory. In 2012, radial velocity variations revealed a long-period, wide-orbiting planet with a mass at least ten times that of Jupiter. The planet, HD 219077 b, is among the three most eccentric planets with a period longer than five years, alongside HD 98649 b and HD 166724 b. The cause of its high eccentricity is not known. The discoverers proposed it as a candidate for direct imaging, as it reaches 11.0 AU at apoastron with an angular separation of 375 milliarcseconds. In 2022, astrometry measured the planet's inclination and true mass.
More in Stars of Tucana
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