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70 Virginis b

Jovian planet orbiting 70 Virginis

Field	Value
name	70 Virginis b
image	70 virginis b (Celestia).jpg
caption	The exoplanet 70 Virginis b (min mass ~7.5 MJ) as rendered by Celestia
discoverer	Geoffrey Marcy
R. Paul Butler
discovery_site	United States
discovered	17 January 1996
discovery_method	Doppler Spectroscopy
orbit_ref
apsis	astron
semimajor	0.481 ±
eccentricity
period	d
time_periastron
arg_peri
semi-amplitude
star	[70 Virginis](70-virginis)
physical_ref
mean_radius	~1
mass

R. Paul Butler | semi-amplitude = 70 Virginis b (abbreviated 70 Vir b) is an extrasolar planet approximately 60 light-years away in the constellation of Virgo. Announced in 1996 by Geoffrey Marcy and R. Paul Butler, 70 Virginis was one of the first stars confirmed to have planets orbiting it. When first announced, 70 Virginis b was considered to be within its star's habitable zone (preferably in the "Goldilocks zone"), but it was later confirmed that the planet has an eccentric orbit, closer to its parent.

Characteristics

Radial velocity changes over time of 70 Virginis caused by the orbit of 70 Virginis b.

70 Virginis b is a gas giant extrasolar planet that is 7.4 times the mass of Jupiter and is in an eccentric 116-day orbit about its host. Its surface gravity is expected to be about six to eight times that of Jupiter, while its radius is about the same as Jupiter's. At the time of discovery in January 1996, it was believed that the star was only 29 ly away resulting in the star being less luminous based on its apparent magnitude. As a result, the planet's orbit was thought to be in the habitable zone and the planet was nicknamed Goldilocks (not too cold or too hot).

The Hipparcos satellite later showed that the star was more distant from Earth and therefore brighter resulting in the planet being too hot to be in the habitable zone.

References

Powell, Corey. (1996-05-27). "A Parade of New Planets". [[Scientific American]].
Perryman, M. A. C.. (1996). "Hipparcos distances and mass limits for the planetary candidates: 47 Ursae Majoris, 70 Virginis, 51 Pegasi". Astron. Astrophys..
Sanders, Robert. (January 17, 1996). "Discovery of two new planets -- the second and third within the last three months -- proves they aren't rare in our galaxy". University of California, Berkeley.
(1996). "A Planetary Companion to 70 Virginis". The Astrophysical Journal Letters.
(2015). "A Comprehensive Characterization of the 70 Virginis Planetary System". The Astrophysical Journal.

Info: Wikipedia Source

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virgo-(constellation) giant-planets exoplanets-discovered-in-1996 exoplanets-detected-by-radial-velocity

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