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47 Ursae Majoris b

Gas giant orbiting the star 47 Ursae Majoris

Field	Value
name	47 Ursae Majoris b / Taphao Thong
image	47 Ursae Majoris b v4.jpg
caption	An artist's impression of 47 Ursae Majoris b, depicting it as a Jovian-like planet
label_width
discoverer	Marcy and
Butler et al.
discovery_site	United States
discovered	17 January 1996
discovery_method	Doppler spectroscopy
discovery_ref
minorplanet	no
adjectives
apsis	astron
aphelion	2.17 ±
perihelion	2.03 ±
semimajor	2.10 ±
eccentricity	0.032 ± 0.014
period	1,078 ± 2 d
~2.95 y
avg_speed	21.3 ± 0.3 km/s
time_periastron	2,451,917
arg_peri	334 ± 23
semi-amplitude	49.00 ± 0.87 m/s
title	Planets Table
url	http://exoplanets.org/planets.shtml
work	Catalog of Nearby Exoplanets
access-date	2008-10-04
archive-url	https://web.archive.org/web/20080921002236/http://exoplanets.org/planets.shtml	archive-date= 21 September 2008	url-status= live}}
star	47 Ursae Majoris
tisserand
single_temperature	200 K
family
atmosphere_composition

Butler et al. ~2.95 y | semi-amplitude = 49.00 ± 0.87 m/s |access-date=2008-10-04 | archive-url= https://web.archive.org/web/20080921002236/http://exoplanets.org/planets.shtml| archive-date= 21 September 2008 | url-status= live}}

47 Ursae Majoris b (abbreviated 47 UMa b), formally named Taphao Thong , is a gas planet and an extrasolar planet approximately 46 light-years from Earth in the constellation of Ursa Major. The planet was discovered located in a long-period orbit around the star 47 Ursae Majoris in January 1996 and as of 2011 it is the innermost of three known planets in its planetary system. It has a mass at least 2.53 times that of Jupiter.

Name

In July 2014 the International Astronomical Union launched NameExoWorlds, a process for giving proper names to certain exoplanets and their host stars. The process involved public nomination and voting for the new names. In December 2015, the IAU announced the winning name was Taphao Thong ( ) for this planet. The winning name was submitted by the Thai Astronomical Society of Thailand. Taphaothong was one of two sisters associated with a Thai folk tale.

Discovery

Taphao Thong was discovered by detecting the changes in its star's radial velocity as the planet's gravity pulls the star around. This was achieved by observing the Doppler shift of the spectrum of Chalawan. After the discovery of the first extrasolar planet around a Sun-like star, Dimidium, astronomers Geoffrey Marcy and R. Paul Butler searched through their observational data for signs of extrasolar planets and soon discovered two: Taphao Thong and 70 Virginis b. The discovery of Taphao Thong was announced in 1996. | name-list-style=vanc | display-authors=1 | doi-access=free

Orbit and mass

Orbits of the 47 Ursae Majoris system planets. 47 UMa b is the innermost planet.

47 Ursae Majoris b orbits at a distance of 2.10 AU from its star, taking 1,078 days or 2.95 years to complete a revolution. It was the first long-period planet around a main sequence star to be discovered. Unlike the majority of known long-period extrasolar planets, the eccentricity of the orbit of 47 Ursae Majoris b is low.

A limitation of the radial velocity method used to detect 47 Ursae Majoris b is that only a lower limit on the planet's mass can be obtained. Preliminary astrometric measurements made by the Hipparcos satellite suggest the planet's orbit is inclined at an angle of 63.1° to the plane of the sky, which would imply a true mass 12% greater than the lower limit determined by radial velocity measurements. | doi-access=free

Physical characteristics

|name-list-style=vanc |display-authors=1

Although 47 Ursae Majoris b is outside its star's habitable zone, its gravitational influence would disrupt the orbit of planets in the outer part of the habitable zone. |name-list-style=vanc |display-authors=1

It has been theorized that light reflections and infrared emissions from 47 UMa b, along with tidal influence, could warm any moons in orbit around it to be habitable, despite the planet being outside the normally accepted habitable zone. | access-date=2009-05-05

References

Thai Astronomical Society, [http://thaiastro.nectec.or.th/library/article/191/ Chalawan, Taphao Thong, Taphao Kaew – First Thai Exoworld Names]
"Exoplanet-catalog".
[http://www.iau.org/news/pressreleases/detail/iau1404/ NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars] {{Webarchive. link. (2017-09-04 . IAU.org. 9 July 2014)
"NameExoWorlds The Process".
[http://www.iau.org/news/pressreleases/detail/iau1514/ Final Results of NameExoWorlds Public Vote Released] {{Webarchive. link. (2017-12-02 , International Astronomical Union, 15 December 2015.)
"NameExoWorlds The Approved Names".
"Stellar Data for 47 Ursa Majoris".
(2010). "A Bayesian periodogram finds evidence for three planets in 47 Ursae Majoris". Monthly Notices of the Royal Astronomical Society.

Info: Wikipedia Source

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