“HD 177830”的意思、由来-开放百科全书

HD 177830 is a 7th magnitude binary star system located approximately 205 light-years away in the constellation of Lyra. The primary star is slightly more massive than our Sun, but cooler being a type K star. Therefore, it is a subgiant clearly more evolved than the Sun. In visual light it is four times brighter than the Sun, but because of its distance, about 205 light years, it is not visible to the unaided eye. With binoculars it should be easily visible.

Stellar system

The secondary star is a Red dwarf star orbiting at a distance of 100 to 200 AU with a likely period of roughly 800 years.^[4]

Planetary system

On November 1, 1999,^[18] the discovery of a planet HD 177830 b was announced by the California and Carnegie Planet Search team using the very successful radial velocity method and an analysis on data released by the team performed by amateur astronomer Peter Jalowiczor along with two other planets. This planet is nearly 50% more massive than Jupiter ({{Jupiter mass|link=y}}) and takes 407 days to orbit the star in an extremely circular orbit.^[3] In 2000 a group of scientists proposed, based on preliminary Hipparcos astrometrical satellite data, that the orbital inclination of HD 177830 b is as little as 1.3°. If that was the case, the planet would have a mass of {{Jupiter mass|67}}, making it a brown dwarf instead of a planet. However, it is very unlikely that the planet would have such orbit. Furthermore, brown dwarfs with short orbits around solar-mass ({{Solar mass|link=y}}) stars are exceedingly rare (the so-called "brown dwarf desert") making the claim even more unlikely.

On November 17, 2010, the discovery of a second planet HD 177830 c was announced along with four other planets. The planet has 50% the mass of Saturn and takes 111 days to orbit the star in a very eccentric orbit. This planet is in a near 4:1 resonance with the outer planet.^[14]

See also

References

1. ^{{cite journal|doi=10.1051/0004-6361/201424474|title=Stellar parameters and chemical abundances of 223 evolved stars with and without planets|journal=Astronomy & Astrophysics|volume=574|pages=A50|year=2015|last1=Jofré|first1=E.|last2=Petrucci|first2=R.|last3=Saffe|first3=C.|last4=Saker|first4=L.|last5=Artur de la Villarmois|first5=E.|last6=Chavero|first6=C.|last7=Gómez|first7=M.|last8=Mauas|first8=P. J. D.|arxiv = 1410.6422 |bibcode = 2015A&A...574A..50J }}
2. ^¹²³⁴{{cite journal|doi=10.1086/428383|title=The Planet‐Metallicity Correlation|journal=The Astrophysical Journal|volume=622|issue=2|pages=1102|year=2005|last1=Fischer|first1=Debra A.|last2=Valenti|first2=Jeff|bibcode = 2005ApJ...622.1102F }}
3. ^¹{{cite press release | title=Astronomers discover six new planets orbiting nearby stars | date=November 1, 1999 | publisher=W. M. Keck Observatory | location=Kamuela, Hawaii | url=http://www.keckobservatory.org/astronomers_discover_six_new_planets_orbiting_nearby_stars/ | accessdate=December 19, 2017 }}
4. ^¹²³⁴{{cite journal | title=The Lick-Carnegie Survey: Four New Exoplanet Candidates | url=http://iopscience.iop.org/0004-637X/727/2/117/article | last1=Meschiari | first1=Stefano | last2=Laughlin | first2=Gregory | last3=Vogt | first3=Steven S. | last4=Butler | first4=R. Paul | last5=Rivera | first5=Eugenio J. | last6=Haghighipour | first6=Nader | last7=Jalowiczor | first7=Peter | display-authors=1 | journal=The Astrophysical Journal | volume=727 | issue=2 | pages=117 | date=2011 | arxiv=1011.4068 | bibcode=2011ApJ...727..117M | doi=10.1088/0004-637X/727/2/117 }}
5. ^¹²{{cite journal | title=Know the Star, Know the Planet. V. Characterization of the Stellar Companion to the Exoplanet Host Star HD 177830 | url=http://iopscience.iop.org/article/10.1088/0004-6256/150/4/103 | last1=Roberts Jr. | first1=Lewis C. | last2=Oppenheimer | first2=Rebecca | last3=Crepp | first3=Justin R. | last4=Baranec | first4=Christoph | last5=Beichman | first5=Charles | last6=Brenner | first6=Douglas | last7=Burruss | first7=Rick | last8=Cady | first8=Eric | last9=Luszcz-Cook | first9=Statia | last10=Dekany | first10=Richard | last11=Hillenbrand | first11=Lynne | last12=Hinkley | first12=Sasha | last13=King | first13=David | last14=Lockhart | first14=Thomas G. | last15=Nilsson | first15=Ricky | last16=Parry | first16=Ian R. | last17=Pueyo | first17=Laurent | last18=Sivaramakrishnan | first18=Anand | last19=Soummer | first19=Rémi | last20=Rice | first20=Emily L. | last21=Veicht | first21=Aaron | last22=Vasisht | first22=Gautam | last23=Zhai | first23=Chengxing | last24=Zimmerman | first24=Neil T. | display-authors=1 | journal=The Astronomical Journal | volume=150 | issue=4 | pages=103 | date=2015 | arxiv=1507.07913 | bibcode=2015AJ....150..103R | doi=10.1088/0004-6256/150/4/103 }}
6. ^¹{{cite web | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+177830 | title=HD 177830 -- Double or multiple star | website=SIMBAD Astronomical Database | publisher=Centre de données astronomiques de Strasbourg | accessdate=2014-10-11}}
7. ^¹²{{cite journal | title=Six New Planets from the Keck Precision Velocity Survey | url=http://iopscience.iop.org/article/10.1086/308981/fulltext/ | last1=Vogt | first1=Steven S. | last2=Marcy | first2=Geoffrey W. | last3=Butler | first3=R. Paul | last4=Apps | first4=Kevin | display-authors=1 | journal=The Astrophysical Journal | volume=536 | issue=2 | pages=902–914 | year=2000 | arxiv=astro-ph/9911506 | bibcode=2000ApJ...536..902V | doi=10.1086/308981 }}

词条	HD 177830
释义	Stellar system Planetary system See also References {{Starbox begin \| name = HD 177830 }}{{Starbox observe \| epoch = J2000.0 \| constell = Lyra \| ra = {{RA\|19\|05\|20.7732}} \| dec = {{DEC\|+25\|55\|14.372}} \| appmag_v = 7.175 }}{{Starbox character \| class = K0IV^[3]/M4V^[4] \| variable = }}{{Starbox astrometry \| radial_v = −71.86 ± 0.06^[1] \| prop_mo_ra = {{val\|−41.228\|0.024}} \| prop_mo_dec = {{val\|−52.587\|0.032}} \| parallax = 15.94 \| p_error = 0.37 \| parallax_footnote = \| absmag_v = }}{{Starbox detail \| temperature = 4948^[2] \| gravity = 4.03^[2] \| rotational_velocity = 2.54^[2] \| mass = 1.48^[2] \| radius = 2.99^[2] \| metal_fe = 0.55 ± 0.03^[14] \| age_gyr = 4.4 ± 2.2^[14] \|bibcode = 2005ApJ...622.1102F }}{{Starbox catalog \| names = BD+25°3719, Gliese 743.2, HIP 93746, GSC 02126-01196, SAO 86791.^[16] }}{{Starbox reference \| Simbad = HD+177830 }}{{Starbox end}} HD 177830 is a 7th magnitude binary star system located approximately 205 light-years away in the constellation of Lyra. The primary star is slightly more massive than our Sun, but cooler being a type K star. Therefore, it is a subgiant clearly more evolved than the Sun. In visual light it is four times brighter than the Sun, but because of its distance, about 205 light years, it is not visible to the unaided eye. With binoculars it should be easily visible. The primary star is known to have two extrasolar planets orbiting around it. Stellar system The secondary star is a Red dwarf star orbiting at a distance of 100 to 200 AU with a likely period of roughly 800 years.^[4] Planetary system On November 1, 1999,^[18] the discovery of a planet HD 177830 b was announced by the California and Carnegie Planet Search team using the very successful radial velocity method and an analysis on data released by the team performed by amateur astronomer Peter Jalowiczor along with two other planets. This planet is nearly 50% more massive than Jupiter ({{Jupiter mass\|link=y}}) and takes 407 days to orbit the star in an extremely circular orbit.^[3] In 2000 a group of scientists proposed, based on preliminary Hipparcos astrometrical satellite data, that the orbital inclination of HD 177830 b is as little as 1.3°. If that was the case, the planet would have a mass of {{Jupiter mass\|67}}, making it a brown dwarf instead of a planet. However, it is very unlikely that the planet would have such orbit. Furthermore, brown dwarfs with short orbits around solar-mass ({{Solar mass\|link=y}}) stars are exceedingly rare (the so-called "brown dwarf desert") making the claim even more unlikely. On November 17, 2010, the discovery of a second planet HD 177830 c was announced along with four other planets. The planet has 50% the mass of Saturn and takes 111 days to orbit the star in a very eccentric orbit. This planet is in a near 4:1 resonance with the outer planet.^[14] {{OrbitboxPlanet begin \| table_ref = ^[14] }}{{OrbitboxPlanet \| exoplanet = c \| mass = ≥0.15 ± 0.03 \| period = 110.9 ± 0.3 \| semimajor = 0.5137 ± 0.0006 \| eccentricity = 0.3495 ± 0.0002 }}{{OrbitboxPlanet \| exoplanet = b \| mass = ≥1.49 ± 0.03 \| period = 406.6 ± 0.4 \| semimajor = 1.2218 ± 0.0008 \| eccentricity = 0.009 ± 0.004 }}{{Orbitbox end}} See also List of extrasolar planets References 1. ^{{cite journal\|doi=10.1051/0004-6361/201424474\|title=Stellar parameters and chemical abundances of 223 evolved stars with and without planets\|journal=Astronomy & Astrophysics\|volume=574\|pages=A50\|year=2015\|last1=Jofré\|first1=E.\|last2=Petrucci\|first2=R.\|last3=Saffe\|first3=C.\|last4=Saker\|first4=L.\|last5=Artur de la Villarmois\|first5=E.\|last6=Chavero\|first6=C.\|last7=Gómez\|first7=M.\|last8=Mauas\|first8=P. J. D.\|arxiv = 1410.6422 \|bibcode = 2015A&A...574A..50J }} 2. ^¹²³⁴{{cite journal\|doi=10.1086/428383\|title=The Planet‐Metallicity Correlation\|journal=The Astrophysical Journal\|volume=622\|issue=2\|pages=1102\|year=2005\|last1=Fischer\|first1=Debra A.\|last2=Valenti\|first2=Jeff\|bibcode = 2005ApJ...622.1102F }} 3. ^¹{{cite press release \| title=Astronomers discover six new planets orbiting nearby stars \| date=November 1, 1999 \| publisher=W. M. Keck Observatory \| location=Kamuela, Hawaii \| url=http://www.keckobservatory.org/astronomers_discover_six_new_planets_orbiting_nearby_stars/ \| accessdate=December 19, 2017 }} 4. ^¹²³⁴{{cite journal \| title=The Lick-Carnegie Survey: Four New Exoplanet Candidates \| url=http://iopscience.iop.org/0004-637X/727/2/117/article \| last1=Meschiari \| first1=Stefano \| last2=Laughlin \| first2=Gregory \| last3=Vogt \| first3=Steven S. \| last4=Butler \| first4=R. Paul \| last5=Rivera \| first5=Eugenio J. \| last6=Haghighipour \| first6=Nader \| last7=Jalowiczor \| first7=Peter \| display-authors=1 \| journal=The Astrophysical Journal \| volume=727 \| issue=2 \| pages=117 \| date=2011 \| arxiv=1011.4068 \| bibcode=2011ApJ...727..117M \| doi=10.1088/0004-637X/727/2/117 }} 5. ^¹²{{cite journal \| title=Know the Star, Know the Planet. V. Characterization of the Stellar Companion to the Exoplanet Host Star HD 177830 \| url=http://iopscience.iop.org/article/10.1088/0004-6256/150/4/103 \| last1=Roberts Jr. \| first1=Lewis C. \| last2=Oppenheimer \| first2=Rebecca \| last3=Crepp \| first3=Justin R. \| last4=Baranec \| first4=Christoph \| last5=Beichman \| first5=Charles \| last6=Brenner \| first6=Douglas \| last7=Burruss \| first7=Rick \| last8=Cady \| first8=Eric \| last9=Luszcz-Cook \| first9=Statia \| last10=Dekany \| first10=Richard \| last11=Hillenbrand \| first11=Lynne \| last12=Hinkley \| first12=Sasha \| last13=King \| first13=David \| last14=Lockhart \| first14=Thomas G. \| last15=Nilsson \| first15=Ricky \| last16=Parry \| first16=Ian R. \| last17=Pueyo \| first17=Laurent \| last18=Sivaramakrishnan \| first18=Anand \| last19=Soummer \| first19=Rémi \| last20=Rice \| first20=Emily L. \| last21=Veicht \| first21=Aaron \| last22=Vasisht \| first22=Gautam \| last23=Zhai \| first23=Chengxing \| last24=Zimmerman \| first24=Neil T. \| display-authors=1 \| journal=The Astronomical Journal \| volume=150 \| issue=4 \| pages=103 \| date=2015 \| arxiv=1507.07913 \| bibcode=2015AJ....150..103R \| doi=10.1088/0004-6256/150/4/103 }} 6. ^¹{{cite web \| url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD+177830 \| title=HD 177830 -- Double or multiple star \| website=SIMBAD Astronomical Database \| publisher=Centre de données astronomiques de Strasbourg \| accessdate=2014-10-11}} 7. ^¹²{{cite journal \| title=Six New Planets from the Keck Precision Velocity Survey \| url=http://iopscience.iop.org/article/10.1086/308981/fulltext/ \| last1=Vogt \| first1=Steven S. \| last2=Marcy \| first2=Geoffrey W. \| last3=Butler \| first3=R. Paul \| last4=Apps \| first4=Kevin \| display-authors=1 \| journal=The Astrophysical Journal \| volume=536 \| issue=2 \| pages=902–914 \| year=2000 \| arxiv=astro-ph/9911506 \| bibcode=2000ApJ...536..902V \| doi=10.1086/308981 }} Gaia Data Release 1 catalog entry^[3]^[4]^[5]^[6]^[7] }}{{Sky\|19\|05\|20.7735\|+\|25\|55\|14.379\|192.54}}{{Stars of Lyra}}{{main-star-stub}} 6 : Henry Draper Catalogue objects\|Hipparcos objects\|Lyra (constellation)\|K-type subgiants\|Planetary systems with two confirmed planets\|Durchmusterung objects
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