{{Short description|Star in the constellation Hercules}} {{Starbox begin | name = HD 152843 }} {{Starbox observe | epoch = J2000 | constell = Hercules<ref name=djm/> | ra = {{RA|16|55|08.35611}}<ref name="GaiaDR3"/> | dec = {{DEC|+20|29|28.7945}}<ref name="GaiaDR3"/> | appmag_v = {{val|8.85|0.01}}<ref name="tycho2"/> }} {{Starbox character | type = Main sequence<ref name="Eisner2021"/> | class = G0<ref name="Eisner2021"/> | appmag_1_passband = B | appmag_1 = {{val|9.38|0.02}}<ref name="tycho2"/> | appmag_2_passband = J | appmag_2 = {{val|7.896|0.018}}<ref name="2MASS"/> | appmag_3_passband = H | appmag_3 = {{val|7.655|0.016}}<ref name="2MASS"/> | appmag_4_passband = K | appmag_4 = {{val|7.629|0.020}}<ref name="2MASS"/> | variable = planetary transit }} {{Starbox astrometry | radial_v = {{val|10.06|0.15}}<ref name="GaiaDR3"/> | prop_mo_ra = {{val|14.838|0.010}} | prop_mo_dec = {{val|44.635|0.012}} | pm_footnote = <ref name="GaiaDR3"/> | parallax = 9.1607 | p_error = 0.0152 | parallax_footnote = <ref name="GaiaDR3"/> | absmag_v = }} {{Starbox detail | source = <ref name="Eisner2021"/> | mass = {{val|1.15|0.04}} | radius = {{val|1.43|0.02}} | luminosity = | gravity = {{val|4.19|0.03}} | temperature = {{val|6310|100}} | metal_fe = {{val|−0.16|0.05}} | rotation = {{val|5.0|0.9|ul=d}} | rotational_velocity = {{val|8.38|0.50}} | age_gyr = {{val|3.97|0.75}} }} {{Starbox catalog | names = {{odlist | BD = +20 3347 | HD = 152843 | PPM = 105343 | SAO = 84691 | TIC = 349488688 | TOI = 2319 | TYC = 1529-224-1 | AG = +20 1698 | GSC = 01529-00224 | 2MASS = J16550834+2029287 | Gaia DR1 = 4564566550698800000 | Gaia DR2 = 4564566554995619072 |Gaia DR3 = 4564566554995619072 }}, YZ&nbsp;20&nbsp;5767<ref name="SIMBAD"/> }} {{Starbox reference | Simbad = HD+152843 | NSTED = HD152843 }} {{Starbox end}}

'''HD 152843''' (also designated as '''TOI-2319''') is a single star with a pair of close-orbiting exoplanets,<ref name="Eisner2021"/> located in the northern constellation of Hercules. It is positioned at a distance of 356&nbsp;light years from the Sun based on parallax measurements,<ref name="GaiaDR3"/> and at that range is too faint to be viewed with the naked eye, having an apparent visual magnitude of 8.85.<ref name="Eisner2021"/> The system is receding further away with a radial velocity of 10&nbsp;km/s.<ref name="GaiaDR3"/>

This is a G-type main-sequence star with a stellar classification of G0.<ref name="Eisner2021"/> It has 1.15 times the mass and 1.43 times the girth of the Sun. Around four billion years of age,<ref name="Eisner2021"/> HD 152843 is a quiet star, showing very little magnetic activity in its chromosphere.<ref name="Nicholson2024"/> The abundance of iron, a measure of the star's metallicity, is somewhat lower than in the Sun. It is spinning with a projected rotational velocity of 8.4&nbsp;km/s.<ref name="Eisner2021"/>

==Planetary system== [[File:HD 152843 System.jpg|thumb|left|upright=1.2|This artist's conception shows a potential appearance of the planets around HD 152843, comparing their size and radius to that of Earth and Neptune.]] This star has two confirmed exoplanets orbiting it, being designated HD 152843 b and HD 152843 c. Both were discovered using NASA’s Transiting Exoplanet Survey Satellite (TESS) when they were observed transiting their host star.<ref name="Eisner2021"/>

HD 152843 b is the closest planet to HD 152843, orbiting its host star in just 11.62 days. The planet has 9.8 Earth masses and 3.1 Earth radii. The planet orbits the star at a distance of 0.105 astronomical units (au), has an orbital eccentricity of 0.05, and has an orbital inclination of 89.3°.<ref name=exoplanetarchive/><ref name="Nicholson2024"/>

HD 152843 c is the second planet in the star system and farthest planet from its star. It has 9.7 Earth masses and 5.9 Earth radii. It orbits its host star at a speed of 7.1 kilometers a second, with its orbital eccentricity being 0.07 and an orbital inclination of 89.2°.<ref name=exoplanetarchive/> Its low density of {{val|0.253|0.059|0.057|u=g.cm-3}} makes it a super-puff planet.<ref name="Nicholson2024"/>

{{Orbitbox planet begin | table_ref = <ref name="Nicholson2024"/> }} {{Orbitbox planet | exoplanet = b | mass_earth = {{val|9.82|1.71|1.61}} | radius_earth = {{val|3.05|0.11}} | semimajor = {{val|0.1049|0.0029|0.003}} | period = {{val|11.62071|0.000096|0.000106}} | eccentricity = {{val|0.046|0.058|0.033}} | inclination = {{val|89.26|0.51|0.58}} }} {{Orbitbox planet | exoplanet = c | mass_earth = {{val|9.67|1.97|1.92}} | radius_earth = {{val|5.94|0.18|0.16}} | semimajor = {{val|0.1482|0.0041|0.0042}} | period = {{val|19.502104|0.000074|0.000085}} | eccentricity = {{val|0.074|0.072|0.05}} | inclination = {{val|89.21|0.53|0.4}} }} {{Orbitbox end}}

==References== {{Reflist|refs=

<ref name="SIMBAD">{{cite simbad | title=HD 152843 | access-date=1 November 2023 }}</ref>

<ref name="GaiaDR3">{{Cite Gaia DR3|4564566554995619072}}</ref>

<ref name="2MASS">{{cite journal |title=VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) |journal=CDS/ADC Collection of Electronic Catalogues |pages=II/246 |volume=2246 |last1=Cutri |first1=Roc M. |last2=Skrutskie |first2=Michael F. |last3=Van Dyk |first3=Schuyler D. |last4=Beichman |first4=Charles A. |last5=Carpenter |first5=John M. |last6=Chester |first6=Thomas |last7=Cambresy |first7=Laurent |last8=Evans |first8=Tracey E. |last9=Fowler |first9=John W. |last10=Gizis |first10=John E. |last11=Howard |first11=Elizabeth V. |last12=Huchra |first12=John P. |last13=Jarrett |first13=Thomas H. |last14=Kopan |first14=Eugene L. |last15=Kirkpatrick |first15=J. Davy |last16=Light |first16=Robert M. |last17=Marsh |first17=Kenneth A. |last18=McCallon |first18=Howard L. |last19=Schneider |first19=Stephen E. |last20=Stiening |first20=Rae |last21=Sykes |first21=Matthew J. |last22=Weinberg |first22=Martin D. |last23=Wheaton |first23=William A. |last24=Wheelock |first24=Sherry L. |last25=Zacarias |first25=N. |year=2003 |bibcode=2003yCat.2246....0C |url=http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=II/246 }}</ref>

<ref name="tycho2">{{cite journal |last1=Høg |first1=E. |last2=Fabricius |first2=C. |last3=Makarov |first3=V. V. |last4=Urban |first4=S. |last5=Corbin |first5=T. |last6=Wycoff |first6=G. |last7=Bastian |first7=U. |last8=Schwekendiek |first8=P. |last9=Wicenec |first9=A. |title=The Tycho-2 catalogue of the 2.5 million brightest stars |journal=Astronomy and Astrophysics |date=March 2000 |volume=355 |pages=L27–L30 |issn=0004-6361 |bibcode=2000A&A...355L..27H}}</ref>

<ref name=djm>{{cite web | title=Finding the constellation which contains given sky coordinates | url=http://djm.cc/constellation.html | access-date=2024-01-10 | date=2 August 2008 | website=djm.cc }}</ref>

<ref name="Eisner2021">{{cite journal | title=Planet Hunters TESS III: two transiting planets around the bright G dwarf HD 152843 | last1=Eisner | first1=N. L. | last2=Nicholson | first2=B. A. | last3=Barragán | first3=O. | last4=Aigrain | first4=S. | last5=Lintott | first5=C. | last6=Kaye | first6=L. | last7=Klein | first7=B. | last8=Miller | first8=G. | last9=Taylor | first9=J. | last10=Zicher | first10=N. | last11=Buchhave | first11=L. A. | last12=Caldwell | first12=D. A. | last13=Horner | first13=J. | last14=Llama | first14=J. | last15=Mortier | first15=A. | last16=Rajpaul | first16=V. M. | last17=Stassun | first17=K. | last18=Sporer | first18=A. | last19=Tkachenko | first19=A. | last20=Jenkins | first20=J. M. | last21=Latham | first21=D. | last22=Ricker | first22=G. | last23=Seager | first23=S. | last24=Winn | first24=J. | last25=Alhassan | first25=S. | last26=Baeten | first26=E. M. L. | last27=Bean | first27=S. J. | last28=Bundy | first28=D. M. | last29=Efremov | first29=V. | last30=Ferstenou | first30=R. | last31=Goodwin | first31=B. L. | last32=Hof | first32=M. | last33=Hoffman | first33=T. | last34=Hubert | first34=A. | last35=Lau | first35=L. | last36=Lee | first36=S. | last37=Maetschke | first37=D. | last38=Peltsch | first38=K. | last39=Rubio-Alfaro | first39=C. | last40=Wilson | first40=G. M. | display-authors=1 | journal=Monthly Notices of the Royal Astronomical Society | volume=505 | issue=2 | pages=1827–1840 | date=August 2021 | doi=10.1093/mnras/stab1253 | doi-access=free | arxiv=2106.04603 | bibcode=2021MNRAS.505.1827E | s2cid=235377108 }}</ref>

<ref name="Nicholson2024">{{cite journal | title=HD152843 b & c: the masses and orbital periods of a sub-Neptune and a superpuff Neptune | last1=Nicholson | first1=B. A. | last2=Aigrain | first2=S. | last3=Eisner | first3=N. L. | last4=Cretignier | first4=M. | last5=Barragán | first5=O. | last6=Kaye | first6=L. | last7=Taylor | first7=J. | last8=Owen | first8=J. | last9=Mortier | first9=A. | last10=Affer | first10=L. | last11=Boschin | first11=W. | last12=Buchhave | first12=L. A. | last13=Cameron | first13=A. Collier | last14=Damasso | first14=M. | last15=Fabrizio | first15=L. Di | last16=DiTomasso | first16=V. | last17=Dumusque | first17=X. | last18=Ghedina | first18=A. | last19=Latham | first19=D. W. | last20=López-Morales | first20=M. | last21=Lorenzi | first21=V. | last22=Fiorenzano | first22=A. F. Martínez | last23=Molinari | first23=E. | last24=Pedani | first24=M. | last25=Pinamonti | first25=M. | last26=Rice | first26=K. | last27=Sozzetti | first27=A. | display-authors=1 | journal=Monthly Notices of the Royal Astronomical Society | volume=532 | issue=4 | pages=4632–4644 | date=August 2024 | doi=10.1093/mnras/stae1821 | doi-access=free | arxiv=2310.15068 | bibcode=2024MNRAS.532.4632N | s2cid=264436430 }}</ref>

<ref name=exoplanetarchive>{{Cite web | title=HD 152843 {{!}} NASA Exoplanet Archive | url=https://exoplanetarchive.ipac.caltech.edu/overview/HD%20152843 | access-date=2023-10-22 | website=exoplanetarchive.ipac.caltech.edu }}</ref>

}}

{{Sky|16|55|08.35611|+|20|29|28.7945|356.0}}

{{Hercules (constellation)}}

<!-- Properties --> Category:G-type main-sequence stars Category:Planetary systems with two confirmed planets <!-- Location/catalogues --> Category:Hercules (constellation) BD+20 3347 152843 2319