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Topic: Gliese 876

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	Universe Today - Just How Earthlike is this New Planet?
		Gliese 876 is thought to be about 11 billion years old, making it more than twice as old as our sun.
		Gliese 876 is thought to be metal-poor (to an astronomer, any element heavier than hydrogen and helium is classified as a "metal").
		Two gas giant planets are known to orbit Gliese 876: the outermost planet is nearly twice the mass of Jupiter, and orbits at 0.21 AU; the middle planet is about half the mass of Jupiter, orbiting at 0.13 AU.
	www.universetoday.com /am/publish/how_earthlike_rocky_planet.html (1749 words)

	Gliese 876 - Wikipedia, the free encyclopedia
		Gliese 876 is a red dwarf star located approximately 15 light-years away in the constellation Aquarius.
		The planet was designated Gliese 876 b and was detected by making measurements of the star's radial velocity as the planet's gravity pulled it around.
		The planet, designated Gliese 876 d, has a minimum mass only 5.88 times that of the Earth and may be a terrestrial planet.
	en.wikipedia.org /wiki/Gliese_876 (975 words)

	Gliese 876
		This is the closest known extrasolar planet to the Sun and the first to be detected and confirmed in orbit around a dwarf star.
		Although Gliese 876b is considerably closer to its primary than Mercury is to the Sun, it has an estimated surface temperature of only -75°C due to the red dwarf's low luminosity.
		The high mass of Gliese 876b suggests that it is a gas giant and therefore probably unsuitable, in any case, to terrestrial-type life.
	www.daviddarling.info /encyclopedia/G/Gliese876.html (304 words)

	06.13.2005 - Astronomers discover most Earth-like extrasolar planet yet
		The team measures a minimum mass of 5.9 Earth masses for the new planet, which is orbiting Gliese 876 with a period of 1.94 days at a distance of 0.021 astronomical units (AU), or 2 million miles.
		Gliese 876 (or GJ 876) is a small, red star known as an M dwarf - the most common type of star in the galaxy.
		Data on the Gliese 876 system, gathered from research the astronomers conducted at the Keck Observatory in Hawaii, were analyzed by Lissauer and Rivera in order to model the unusual motions of the two known planets.
	www.berkeley.edu /news/media/releases/2005/06/13_planet.shtml (1332 words)

	SkyTonight.com - News from SkyTonight - Exoplanet's Mass Pinned Down
		The astronomers found that the reflex motion of Gliese 876 amounts to only 1/2,000 of an arcsecond on the sky, the equivalent of an ellipse 3 feet (1 meter) long on the surface of the Moon.
		Gliese 876 was an excellent target for the study because of its nearness and its low mass as a type M4 red dwarf (estimated at about 0.32 of the Sun's mass).
		The Gliese 876 system is especially interesting because its two planets seem to be locked in a 2:1 orbital resonance; the outer one orbits in 60 days, the inner one in 30 days.
	skytonight.com /news/3306961.html?page=1&c=y (751 words)

	BBC NEWS \| Science/Nature \| Scientists 'weigh' distant world
		The planet is one of a pair that orbit Gliese 876, one of the closest stars to our Sun, and the closest star around which a planet has been found.
		The planet, called simply Gliese 876b, has been found to be about twice as heavy as Jupiter and orbits its star at a distance of about one-fifth of the Earth's distance from our Sun.
		Gliese 876b is now known to weigh between 1.89 and 2.4 times as much as Jupiter.
	news.bbc.co.uk /2/hi/science/nature/2542919.stm (393 words)

	exoplanets: new exoplanet (Site not responding. Last check: 2007-10-20)
		Gliese 876 (or Gl 876) is a red dwarf star, 5 times less massive than the Sun (its mass is also 200 times the mass of Jupiter).
		Gl 876 is much less luminous and much cooler than the Sun: about 3000 degrees, compared with 6000 degrees for the solar surface.
		At this conference, Geoffrey Marcy separately reported his team's independent discovery of this companion to Gliese 876, using the Lick and Keck observatories.
	www.obs-hp.fr /www/nouvelles/gl876.html (664 words)

	Wired News: Planet Hunters Seek Amateurs
		Over the next few months, amateur astronomers who keep a watchful eye on Gliese 876 may be able to detect one of the two planets that orbit the star.
		The planets orbiting Gliese 876 were first detected in 1998 by Geoffrey Marcy and his team of extrasolar planet hunters at the University of California at Berkeley.
		The two planets orbiting Gliese 876 were detected the way most extrasolar planets are detected, using the Doppler effect.
	www.wired.com /news/technology/1,43865-0.html (741 words)

	APOD: June 26, 1998 - A Planet For Gliese 876 (Site not responding. Last check: 2007-10-20)
		APOD: June 26, 1998 - A Planet For Gliese 876
		Gliese 876 is smaller than the Sun, only about 1/3 as massive, and too faint to be seen without a telescope.
		of Gliese 876 indicates that its planet orbits once every 61 days at an average distance of about 1/5 the radius of the Earth's orbit.
	antwrp.gsfc.nasa.gov /apod/ap980626.html (165 words)

	Re: On Gliese, isn't it possible to live with these kind of conditions?
		The star is Gliese 876, an M class dwarf about 1/3 the mass of our Sun, and about 1/40 as luminous as our Sun at a comparable distance.
		The planet is Gliese 876b, discovered just a couple months ago through careful measurement of the Doppler shifts in the star's light.
		Gliese 876 appears 4 times as bright when the planet is at perihelion compared to aphelion.
	www.madsci.org /posts/archives/aug98/904082684.As.r.html (562 words)

	SIGHTINGS
		Located in the direction of the constellation Aquarius, Gliese 876 is about a third of the distance to the next nearest star known to have a planet, or about 87 trillion miles away.
		Gliese 876 is a red dwarf, the first such dim, low-mass star ever found to have a planet.
		The planet travels an egg-shaped path around Gliese 876, at an average distance about one-fifth that between sun and Earth, or half that of Mercury, the innermost planet to the sun.
	www.rense.com /ufo/hugeplanet.htm (1004 words)

	Astronomy Online - Gliese 876
		Gliese 876 is a class M4 star with a visual magnitude of 10.1.
		While the simulations of the Gliese 876 system are sensitive to the initial setup parameters of the Cartesian coordinates, this was not the case in simulating the above Solar System.
		In the case of Gliese 876, the large bodies exhibit a 2/1 resonance – that is the middle planet – GJ876c - orbits at 30.3 days while the outer planet - GJ876b - rotates at 61 days.
	astronomyonline.org /Exoplanets/Gliese876.asp?Cate=Exoplanets&SubCate=Gliese876 (5108 words)

	Gliese 876 / Ross 780
		Gliese 876 is a variable star with the designation "IL Aquarii." Some other useful star catalogue designations include: IL Aqr, Gl 876, Hip 113020, BD-15 6290, G 156-57, LHS 530, LTT 9244, LPM 841, LFT 1745, Vys 337, and Ross 780.
		Despite its close orbital distance, Gliese 876 is so dim that the presumed gaseous surface of the planet has a temperature around -75° C (-103° F) -- far below the freezing point of water -- according to calculations by Didier Saumon of Vanderbilt University.
		Designated Gliese 876 "d", the object has a probable mass around 7.53 +/- 0.70 Earth-masses (0.024 Jupiter-masses) at an orbital inclination of 50° and a diameter less than twice (1.73) that of Earth's (NSF press release and images and videos).
	www.solstation.com /stars/gl876.htm (1712 words)

	Universe Today - Large Rocky Planet Discovered
		The team measures a minimum mass for the planet of 5.9 Earth masses, orbiting Gliese 876 with a period of 1.94 days at a distance of 0.021 astronomical units (AU), or 2 million miles.
		Gliese 876 (or GJ 876) is a small, red star known as an M dwarf — the most common type of star in the galaxy.
		Lissauer and Rivera have been analyzing Keck data on the Gliese 876 system in order to model the unusual motions of the two known planets, and three years ago got an inkling that there might be a smaller, third planet orbiting the star.
	www.universetoday.com /am/publish/large_rocky_planet.html (1552 words)

	NAI News Article: The Dance of the Giant Planets (Site not responding. Last check: 2007-10-20)
		Lissauer and State University of New York at Stony Brook graduate student Eugenio Rivera used a numerical model to demonstrate the stability of the nearly twin orbits around the star known as Gliese 876, a dim red dwarf 15 light years from Earth in the constellation Aquarius.
		Two Planets Orbiting Gliese 876: Announcement and data from the team of scientists who detected the planets.
		Gliese 876 is located in the constellation Aquarius.
	nai.arc.nasa.gov /news_stories/news_print.cfm?ID=214 (728 words)

	Current Spacecraft Missions - Hubble Weighs a Planet (Site not responding. Last check: 2007-10-20)
		Gliese 876 is a star that has been known to wobble from another observing trick called Doppler spectroscopy.
		Starlight from Gliese 876 shifts color slightly back and forth from redder to bluer on a regular basis.
		Gliese 876b is only the second extrasolar planet whose mass is so well known.
	www.mos.org /cst-archive/article/4694/5.html (274 words)

	Extrasolar Visions - Gliese 876 d
		Superearth Gliese 876 d is only 7.5 Earth masses, making it as of mid 2005 the smallest extrasolar planet known around a normal star.
		If, on the other hand, most of the planet's volatiles have been lost to early bombardment or were never present in large quantities, the rocky surface of Gliese 876 d may be visible from space.
		Baked both internally by the heat of radioactive decay and externally by its close proximity to its star, such a massive terrestrial world have a thin crust riddled with tectonic rifts and possibly even oceans of magma exposed on the surface.
	www.extrasolar.net /planettour.asp?StarCatId=normal&PlanetId=296 (242 words)

	NASA - Team Discovers Smallest Extra-solar Planet Yet
		The team studied irregularities in the motion of two known giant extra-solar planets circling the star Gliese 876 and its motion to deduce the presence of a third planet in that system, according to a scientific paper submitted for publication in the Astrophysical Journal.
		One of the two giant planets orbiting Gliese 876 has a mass half that of Jupiter.
		According to the team, their data indicate the planet very closely orbits the star, as close as 10 stellar radii, which is less than a tenth of Mercury's orbit about the sun.
	www.nasa.gov /centers/ames/research/exploringtheuniverse/gliese.html (748 words)

	SPACE.com -- First Accurate Measurement of an Extrasolar Planet's Mass
		Researchers used the Hubble Space Telescope to watch the wiggle a star traced upon the sky as it was tugged back and forth by the gravity of the orbiting planet.
		The star, called Gliese 876, is 15 light-years away.
		Its planet, named Gliese 876b, was previously discovered using an indirect method that measures a shift in light waves indicating the star is moving toward or away from Earth.
	www.space.com /scienceastronomy/wobble_seen_021203.html (1090 words)

	Discover Extraterrestrial Life at Nearby Star Gliese 876
		The book follows Roger Krebs, a postdoctoral fellow in exobiology, who believes he discovers intelligent life when a robotic probe approaches the fourth planet from Gliese 876 in the year 2057.
		Plans for a revitalized manned space program to visit the planet -- shortened in name to Gliese 4 -- begin almost immediately, but face an uphill battle due to a host of adverse conditions, not only on the engineering and scientific fronts, but also on the political one.
		Although the spacecraft arrives at its destination, unanticipated strains on its resources force the captain to call everyone to Gliese 4's surface, where conditions are almost too ideal for human habitation.
	www.emediawire.com /releases/2006/9/emw442306.htm (494 words)

	Preventing Fake Check Scams - Fraudulent/Counterfeit (Site not responding. Last check: 2007-10-20)
		Superearth Gliese 876 d is only 7.5 Earth masses, making it as of mid 2005...
		Gliese 876 d is a low-mass extrasolar planet orbiting the star Gliese 876 with a period of 1.94 days...
		Gliese 876 is smaller than the Sun, only about 1...
	www.webnetpresence.com /information/876.html (623 words)

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