View source for Astronomy:OGLE-2006-BLG-109L

{{Starbox begin
| name = OGLE-2006-BLG-109L
}}
{{Starbox image
| image = [[Image:OGLE-2006-BLG-109L location.svg|250px]]
| caption = Location of OGLE-2006-BLG-109L (green) in the constellation of Scorpius.
}}
{{Starbox observe
| epoch = J2000.0
| constell = Scorpius
| ra =  {{RA|17|52|35.0}}<ref name="SIMBAD"/>
| dec = {{DEC|–30|05|16}}<ref name="SIMBAD"/>
| appmag_v = 17.17<!--Apparent magnitude (Johnson-Cousins V  system)-->
}}
{{Starbox character
| class = ''Unsure (probably M0V)''
| r-i = <!--R-I color-->
| v-r = <!--V-R color-->
| b-v = <!--B-V color-->
| u-b = <!--U-B color-->
| variable = <!--Variability type-->
}}
{{Starbox astrometry
| radial_v = <!--Radial velocity (in km/sec)-->
| prop_mo_ra = <!--Proper motion (RA), μα cos δ (in milliarcsec/yr)-->
| prop_mo_dec = <!--Proper motion (dec), μδ (in milliarcsec/yr)-->
| parallax = <!--Parallax (in milliarcsec)-->
| p_error = <!--Parallax error (in milliarcsec)-->
| parallax_footnote = <!--Parallax footnote-->
| dist_ly = 4,920 ± 390
| dist_pc = 1,510 ± 120
| space_v_u = <!--Space velocity (U), σu cos v w (in km/s)-->
| space_v_v = <!--Space velocity (V), σv cos w (in km/s)-->
| space_v_w = <!--Space velocity (W), σw (in km/s)-->
| absmag_v = <!--Absolute magnitude (Johnson-Cousins V system)-->
}}
{{Starbox detail
| source = <!--[source url]-->
| mass = 0.51 ± 0.04
| radius = <!--Radius (in solar radii)-->
| gravity = <!--Surface gravity (given as the base 10 logarithm expressed in cgs units)-->
| luminosity = <!--Luminosity (in solar luminosities)-->
| temperature = ~4,000
| metal = <!--Metallicity (no units provided by template)-->
| rotation = <!--Rotation (no units provided by template)-->
| age = <!--Age (in years)-->
}}
{{Starbox catalog
| names=EWS 2006-BUL-109 
}}
{{Starbox reference
| Simbad=EWS+2006-BUL-109
| EPE=OGLE-06-109L
}}
{{Starbox end}}

'''OGLE-2006-BLG-109L''' (where 'L' stands for lens) is a dim [[Astronomy:Apparent magnitude|magnitude]] 17 M0V [[Astronomy:Galactic bulge|galactic bulge]] [[Astronomy:Star|star]] approximately 4,920 [[Astronomy:Light-year|light-year]]s away in the [[Astronomy:Constellation|constellation]] of Scorpius.<ref name="SIMBAD">{{cite simbad
 | title= NAME OGLE 2006-BLG-109
 | access-date=2009-04-30 }}</ref>

== Planetary system ==
In 2008, two extrasolar planets were discovered around the star using [[Physics:Gravitational microlensing|gravitational microlensing]]. The two planets are at a distance from their star that make them suspected analogs of [[Astronomy:Jupiter|Jupiter]] and [[Astronomy:Saturn|Saturn]].<ref name="Gaudi2008"/> [[Image:OGLE-2006-BLG-109 scheme2.png|thumb|left|A scheme of the planetary system.]]
The star is surrounded by a [[Astronomy:Planetary system|planetary system]] consisting of at least two planets: b with a mass of 0.727 of [[Astronomy:Jupiter|Jupiter]] and c with the mass of approximately 0.271 of [[Astronomy:Jupiter|Jupiter]]. Their mass ratios, distance ratios, and equilibrium temperatures are similar to those of Jupiter and [[Astronomy:Saturn|Saturn]] in the [[Astronomy:Solar System|Solar System]] as well as the 47 UMa system.<ref name="Gaudi2008"/>

Both planets were discovered simultaneously by [[Physics:Gravitational microlensing|gravitational microlensing]] in a common effort by the [[Astronomy:Optical Gravitational Lensing Experiment|Optical Gravitational Lensing Experiment]], [http://www.astronomy.ohio-state.edu/~microfun/ microFUN], [[Physics:Microlensing Observations in Astrophysics|MOA]], [[Physics:Probing Lensing Anomalies Network|PLANET]] and [[Astronomy:RoboNet|RoboNet]] collaborations, as announced on 14 February 2008. This is the first planetary system where more than one planet was detected using gravitational microlensing.

{{OrbitboxPlanet begin}}
{{OrbitboxPlanet
| exoplanet = [[Astronomy:OGLE-2006-BLG-109Lb|b]]
| mass = 0.727 ± 0.06
| semimajor = 2.3 ± 0.5
| period = 1790 ± 548
| eccentricity = ?<!--Eccentricity of the planet-->
}}
{{OrbitboxPlanet
| exoplanet = [[Astronomy:OGLE-2006-BLG-109Lc|c]]
| mass = 0.271 ± 0.022
| semimajor = 4.5 ± 1
| period = 4931 ± 1750
| eccentricity = 0.15 ± 0.1
}}
{{Orbitbox end}}

== See also ==
* [[Astronomy:Optical Gravitational Lensing Experiment|Optical Gravitational Lensing Experiment]] or ''OGLE''
* [[Astronomy:OGLE-2005-BLG-390L|OGLE-2005-BLG-390L]]

==References==
{{Reflist|colwidth=30em|refs=

<ref name="Gaudi2008">{{cite journal | title=Discovery of a Jupiter/Saturn Analog with Gravitational Microlensing | journal=Science | volume=319 | issue=5865 | year=2008 |  pages=927–930 | last1=Gaudi | first1=B. S. | first2=B.S. | last2=Bennett | first3=DP | last3=Udalski | last4=Gould | first4=A | last5=Christie | first5=GW | last6=Maoz | first6=D | last7=Dong | first7=S | last8=McCormick | first8=J | last9=Szymanski | first9=MK | display-authors=1 | doi=10.1126/science.1151947 | pmid=18276883 | bibcode=2008Sci...319..927G | arxiv=0802.1920 | s2cid=119281787 }}</ref>

}}

== External links ==
* {{cite web |url=http://www.space.com/scienceastronomy/080214-planets-found.html |title=Solar System Like Ours Found |access-date=2008-06-27 |work=Space.com |date=2008-02-14 |first=Robert Roy |last=Britt }}
* {{cite web |url=http://www.astronomy.ohio-state.edu/~microfun/ob06109/ |title=Discovery of a Jupiter/Saturn Analog in OGLE-2006-BLG-109 |access-date=2008-06-27 |work=MicroFUN }}
* {{cite web |url=http://www.artemis-uk.org/highlights/unlonely_planets/ |title=The unlonely planets — Discovery of a Jupiter/Saturn analogue |access-date=2008-06-27 |work=ARTEMiS |date=2006-02-11 |first=Martin |last=Dominik |archive-date=2012-02-10 |archive-url=https://web.archive.org/web/20120210162320/http://www.artemis-uk.org/highlights/unlonely_planets/ |url-status=dead }}
* {{cite web |url=https://www.nytimes.com/2008/02/14/science/space/14cnd-planet.html?_r=1&oref=slogin |title=Scientists Find Solar System Like Ours |access-date=2008-06-27 |work={{wipe|The New York Times}} |date=2008-02-14 |first=Dennis |last=Overbye }}
* {{cite web |url=http://news.bbc.co.uk/2/hi/science/nature/7333155.stm |title= Solar System's 'look-alike' found |access-date=2008-06-27 |work=BBC News |date=2008-04-06 |first=Paul |last=Rincon }}
* {{cite web
| url=http://media4.obspm.fr/exoplanets/base/etoile.php?nom=OGLE-06-109L
| title=OGLE-06-109L
| work=Exoplanets
| access-date=2009-04-30
| archive-url=https://web.archive.org/web/20160303224410/http://media4.obspm.fr/exoplanets/base/etoile.php?nom=OGLE-06-109L
| archive-date=2016-03-03
| url-status=dead
}}

{{Sky|17|52|35|-|30|05|16|4900}}

{{Stars of Scorpius}}

[[Category:M-type main-sequence stars]]
[[Category:Gravitational lensing]]

{{Sourceattribution|OGLE-2006-BLG-109L}}