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Topic: Rho Coronae Borealis

	Rho Coronae Borealis
		It lies near the center (16:1:2.7+33:18:12.6, ICRS 2000.0) of Constellation Corona Borealis, the Northern Crown -- north of Iota Coronae Borealis and northeast of Theta Coronae Borealis and Alphecca (Alpha Coronae Borealis).
		Rho Coronae Borealis is a yellow-orange main sequence dwarf star of spectral and luminosity type G0-2 Va. The star has about 95 percent of Sol's mass (exoplanets.org), 1.31 times its diameter, and 1.61 to 1.77 times its luminosity (Noyes el al, 1997; and Extrasolar Planets Encyclopaedia).
		The orbit of an Earth-like rocky planet (with liquid water) around Rho Coronae Borealis may have to be between 0.94 and 1.85 AU (Jones and Sleep, 2003) -- from just inside the average orbital distance of Earth and beyond that of Mars -- with an orbital period around one to two Earth years.
	www.solstation.com /stars2/rho-crb.htm (1162 words)

	Rho Coronae Borealis (Site not responding. Last check: 2007-11-02)
		The planet orbits Rho Coronae Borealis in 39.6 days (45 percent that of Mercury's orbital period around the Sun) and is and is 0.23 astronomical units from the star (which equals 35 million kilometers, 21 million miles, or 59 percent Mercury's distance from the Sun).
		From the measured tilt of the disk, Rho Coronae Borealis's planet is found to have a mass 1.5 times that of Jupiter.
		Rho Coronae Borealis is a fifth magnitudfe (on the faint side, 5.41) class G (G2, some suggest G0) ordinary dwarf 57 light years away.
	www.astro.uiuc.edu /~kaler/sow/rhocrb.html (220 words)

	Rho Coronae Borealis - Wikipedia, la enciclopedia libre
		Rho Coronae Borealis (ρ CrB) es el nombre de una estrella enana amarilla en la constelación de Corona Boreal, situada el norte de ι Coronae Borealis y al noreste de Alphecca (α Coronae Borealis).
		Rho Coronae Borealis tiene un disco circumestelar de polvo que puede ser similar en composición al cinturón de Kuiper del sistema solar, pudiendo extenderse hasta 85 UA de la estrella.
		Datos planetarios de Rho Coronae Borealis (en inglés).
	es.wikipedia.org /wiki/Rho_Coronae_Borealis#V.C3.A9ase_tambi.C3.A9n (279 words)

	A Planet Orbiting the Star rho Coronae Borealis
		A Planet Orbiting the Star rho Coronae Borealis
		High precision radial velocity measurements of the star
		CrB is the star `rho' in the Corona Borealis constellation (i.e.
	cfa-www.harvard.edu /afoe/rhoCrB.html (520 words)

	eSky: Corona Borealis
		When Dionysus came upon her on the island of Naxos, it is said, he threw her jewelled band into the sky to prove his godhood, and then claimed her as his wife.
		Gemma is the brightest, while faint Iota Coronae Borealis has a magnitude of just +5.0.
		This is Rho Coronae Borealis, a binary star but otherwise very similar to our own Sun, and one of the few stars known to have a planet in orbit.
	www.glyphweb.com /esky/constellations/coronaborealis.html (196 words)

	[No title] (Site not responding. Last check: 2007-11-02)
		Such an orbital radius is too large for tidal circularization of an initially eccentric orbit during the lifetime of the star, and hence we suggest that the low eccentricity is primordial, as would be expected for a planet formed by the process of accretion in the circumstellar disk.
		Rho Coronae Borealis is a Solar-Type star (G0V), and is probably at least as old as the Sun, judging from its weak chromospheric activity.
		The Doppler periodicity for Rho Cor Bor is very convincing, having an amplitude of 67 meters/sec.
	cannon.sfsu.edu /~gmarcy/planetsearch/rhocrb/rhocrb.html (654 words)

	et
		Precise Doppler measurements of the star rho Coronae Borealis have been made during the past year by Robert W. Noyes, Saurabh Jha, Sylvain G. Korzennik, Martin Krockenberger, Peter Nisenson, Timothy Brown, Edward Kennelly, and Scott Horner using the "Advanced Fiber Optic Echelle" spectrometer.
		Rho Coronae Borealis (link to picture) is a solar-type star (G0V), and is probably at least as old as the sun, judging from its weak chromospheric activity.
		The research team concluded that the period is 39.6 days, the minimum mass is 1.1 Jupiter masses, the orbit has small eccentricity, and the orbital radius is 0.23 AU.
	ed.fnal.gov /help/97/et/etbaschl.html (712 words)

	ASP: Keep an Eye on Hypergiant Rho Cassiopeiae (Site not responding. Last check: 2007-11-02)
		She goes without a proper name, but recently the 17th brightest star of the northern constellation Cassiopeiae is drawing the attention of amateur and professional astronomers worldwide.
		In the spring of 2000 Rho Cassiopeiae, or r Cas, brightened up to magnitude 4.0, then dimmed to an astonishing 5.3 over the next half year, while changing its usual yellowish-white color to the red-orange glare of Betelgeuse (a Orionis).
		And the R Coronae Borealis stars can suddenly dim by several magnitudes; they are much fainter and less intrinsically luminous than r Cas, however.
	www.astrosociety.org /pubs/mercury/33_01/rho.html (282 words)

	New Planet Found
		The new, unnamed planet orbits about 23 million miles from Rho Coronae Borealis and completes one orbit every 40 days, making its year 40 days long.
		Rho Coronae Borealis can be seen without a telescope or binoculars from February through December in the Northern Hemisphere.
		"Rho Coronae Borealis appears to be about 10 billion years old, or twice as old as the sun," Brown says.
	www.news.harvard.edu /gazette/1997/05.01/NewPlanetFound.html (736 words)

	New Planet Is Ninth outside Solar System
		With the discovery of a new planet in the system of Rho Coronae Borealis, a Sun-like star about 50 light years from our solar system, the number of planets that have been discovered orbiting around other stars like ours now equals the number in our own solar system: nine.
		The variation of Rho Coronae Borealis is only 67 meters per second (about 150 miles per hour) in 40 days.
		The 40-day period of Rho Coronae Borealis is so long, however, that the team concludes that pulsations are unlikely to be the cause.
	www.ucar.edu /communications/quarterly/summer97/planet.html (840 words)

	exoplanets: Rho Coronae Borealis B (Site not responding. Last check: 2007-11-02)
		Coronae Borealis is another one of these, but it appears to
		Coronae Borealis is visible from February through September to
		Rho Coronae Borealis observed at the Smithsonian Institution's
	www-laog.obs.ujf-grenoble.fr /~listserv/exoplanets/0053.html (815 words)

	[No title]
		Using a special instrument known as the Advanced Fiber Optic Echelle (AFOE) spectrograph located at the 1.5-meter Tillinghast Reflector of the Whipple Observatory, the scientists detected extremely small variations in the recession velocity of Rho Coronae Borealis that are thought to be caused by the presence of an orbiting companion.
		This led the team to conclude that the star has a companion in a 40-day orbit and, from the size of the velocity variation and the mass of the star (almost identical to the Sun), they calculated that the companion must be slightly more massive than the planet Jupiter.
		The star Rho Coronae Borealis is another one of these, but it appears to be about 10 billion years old -- twice as old as the Sun." Scott Horner, of Penn State, designed and built the AFOE's iodine cell (a precise velocity-reference device).
	www.lyon.edu /projects/marsbugs/1997/19970511.txt (8325 words)

	news.html
		Rho Coronae Borealis is visible to the naked eye in the Northern Hemisphere from February through September and is located approximately 50 light-years from Earth.
		The star Rho Coronae Borealis is believed to be about 10 billion years old -- twice as old as the Sun.
		The irregularities in the star's velocity are thought to be caused by the presence of an orbiting companion.
	www.psu.edu /ur/archives/intercom_1997/May1/CURRENT/news.html (3956 words)

	Augusta Georgia: technology@ugusta: Astronomers add another planet to their collection 4/24/97
		The object orbiting Rho Coronae Borealis is hardly the first to be discovered circling another star - depending on how you count, it's somewhere in the ninth to 13th range.
		But it is still significant, astronomers say, because it fills in a gap in their planet collection and reinforces their belief that more exist.
		Because the planet is closer to its star than Mercury is to the sun, its surface temperature is estimated at 400 to 500 degrees Fahrenheit.
	chronicle.augusta.com /stories/042597/tech_newplanet.html (396 words)

	Amazon.com: "Rho Cassiopeiae": Key Phrase page (Site not responding. Last check: 2007-11-02)
		Rho Cassiopeiae (upper left arrow) and 6 Cassiopeiae (lower left arrow), on the other hand,...
		Rho Cassiopeiae is an unstable supergiant star, one of the brightest stars in our galaxy but several thousand light years distant from...
		return to the star Caph in the Cassiopeia W, then turn sharply toward the southwest, to Rho Cassiopeiae, which might be too faint to see by eye, but it should be easy to spot through finderscopes and binoculars...
	www.amazon.com /phrase/Rho-Cassiopeiae (517 words)

	Digital Skyline -- June 2003
		Corona Borealis is right at the zenith, the imaginary 'top of the sky', around midnight this month.
		In the picture, you will see two stars, in the region of Corona Borealis, but not in the curve itself, which are labeled.
		The Rho star of Corona Borealis is a star about the same size as our sun.
	www.ccm.edu /planetarium/ds/ds_200306.htm (1827 words)

	OSETI III: Can Terrestrial Planets Exist in the Habitable Zones of Known Exoplanetary Systems?
		It is therefore of interest to see whether such planets could exist in them, and in particular whether they could survive in the habitable zones for times long enough to allow the emergence of intelligent species.
		We have employed numerical integration to investigate this question for the Rho Coronae Borealis and 47 Ursae Majoris systems.
		We have found that, in both cases, over much of the parameter space defining the launch orbit of a terrestrial planet, the terrestrial planet remains in the habitable zone for billions of years.
	www.coseti.org /4273-04.htm (333 words)

	Extrasolar Planets
		In fact, they extend their premise beyond Peg 51 to further suggest that stars such as Rho 1 Canceri, 47 Ursae Majoris, and 70 Virginis (to some degree) are also strong candidates to have at least one Earth-like planet as part of their solar system family.
		By measuring the doppler shifts in the spectrum of Rho 1 Canceri, a star similiar to our sun; spectral type G8, Marcy and Butler (1) announced that a planetary companion is indeed revolving about the star.
		radial velocity measurements for Rho Coronae Borealis were taken with the Advanced Fiber Optic Echelle spectrograph located at the 1.5-meter Tillinghast Reflector of the Fred Lawrence Whipple Observatory on Mt. Hopkins, Arizona.
	www.public.asu.edu /~sciref/exoplnt.htm (15809 words)

	Are most extrasolar planets hefty imposters?: Science News Online, Oct. 28, 2000 (Site not responding. Last check: 2007-11-02)
		In January, Mazeh plans to hunt for further evidence that rho Coronae Borealis has a companion that's a star, not a planet.
		Further analysis of the HIPPARCOS measurements of p coronae borealis—confirmation of a massive secondary.
		Analysis of the Hipparcos measurements of HD 10697: A mass determination of a brown dwarf secondary.
	www.sciencenews.org /20001028/fob3.asp (808 words)

	NCAR Scientists Help Find New Planet
		To an observer on Earth, this means that the star's speed through the universe relative to that of our own solar system appears to change with a regular pattern, detected in the starlight.
		The instrument is attached to the 1.5-meter telescope operated by the SAO at Mt. Hopkins.
		This had recently been suggested by David Gray of the University of Western Ontario to explain wobbles seen in the motion of 51 Pegasi, the star that the first exoplanet in the recent chain of discoveries was believed to orbit.
	www.ucar.edu /communications/newsreleases/1997/planet.html (847 words)

	NIEUWE PLANETEN
		The star Rho Coronae Borealis is another one of these, but it appears to be about 10 billion years old -- twice as old as the Sun."
		As one of the stars forming the "crown" of the constellation, Rho Coronae Borealis is visible from February through September to naked-eye observers in the Northern Hemisphere.
		Graphic representation of variations in the velocity of the star Rho Coronae Borealis observed at the Smithsonian Institution's Whipple Observatory in Arizona, showing a 40-day period indicative of a Jupiter-sized companion.
	www.xs4all.nl /~carlkop/extrapl.html (2347 words)

	Amazon.com: "Rho Oph": Key Phrase page (Site not responding. Last check: 2007-11-02)
		Acrux consists of a B0.5 subgiant set 4.4 seconds of arc from a BI dwarf, while Rho Oph is made of a pair of B2 stars 3.2 seconds of an arc apart.
		If, as it seems to me, the young cluster/ young association IMF is deficient (by a factor of...
		Ophiuchi and Sigma (6) Scorpii: Antares is a ruddy-orange star embedded in a dust cloud reflecting its ruddy-orange light, Rho Oph is a blue-white star embedded in a dust cloud reflecting its blue light, but Sigma Sco is a very hot...
	www.amazon.com /phrase/Rho-Oph (568 words)

	Extra-Solar System Planets (Site not responding. Last check: 2007-11-02)
		Knowing that he and Marcy still had mountains of data to sift through, and that several other research teams were in the hunt as well, Butler predicted that "Within one year, more extrasolar planets will be known than there are in our solar system." This statement, far from boastful, turned out to be prophetic.
		Detection of an eighth planet was reported in April of 1997, when a nine-member team led by Robert W. Noyes of Harvard University detected a planet orbiting the star Rho Coronae Borealis.
		Because no one has been able to image or take spectra of these hot Jupiters - they were discovered indirectly through their gravitational pull on their host stars - nobody knows exactly what these planets are like.
	sciastro.net /portia/articles/extra-planets.htm (4202 words)

	ASP: More Than Just a Planet, It's a Meal (Site not responding. Last check: 2007-11-02)
		In contrast, the eccentricities of these five extrasolar planets range between 0.35 and 0.63.
		Another subset - composed of the planets orbiting 51 Pegasi, Rho Cancri, Tau Bootis, Upsilon Andromedae, and Rho Coronae Borealis - have low eccentricity orbits that are considerably smaller than that of Mercury.
		These five planets all have masses greater than that of Saturn, and have managed to survive very close to their host stars.
	www.astrosociety.org /pubs/mercury/9901/sandquist.html (3132 words)

	Astro news.
		Big planets have also been found at Rho Cancri and Tau Bootis, the later planet orbits very close to it's sun which makes it similar to the 51 Pegasi system shown in the illustration.
		The latest planet that was added to the list in 1997 is one of at least Jupiters mass, orbiting the star Rho Coronae Borealis.
		In addition to these Lalande 21185, at a distance of 8.25 lightyears might be orbited by two planets the size of Jupiter and Saturn making it the closest known planetary system to date.
	boreale.konto.itv.se /zoneastr.htm (986 words)

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