{{Short description|Binary star in the constellation Coma Berenices}} {{Starbox begin | name = HD 115404 }} {{Starbox observe 2s | epoch = J2000 | constell = [[Coma Berenices]]<ref>{{cite constellation|HD 115404}}</ref> | component1 = HD 115404 A | ra1 = {{RA|13|16|51.05143}}<ref name="GaiaDR3A"/> | dec1 = {{DEC|+17|01|01.8409}}<ref name="GaiaDR3A"/> | appmag_v1 = 6.66<ref name=Fabricius>{{cite journal|title=The Tycho double star catalogue|author1=Fabricius, C.|author2=Høg, E.|author3=Makarov, V. V.|author4=Mason, B. D.|author5=Wycoff, G. L.|author6=Urban, S. E.|journal=Astronomy and Astrophysics|volume=384|pages=180–189|date=2002|bibcode=2002A&A...384..180F|doi=10.1051/0004-6361:20011822|doi-access=free}}</ref> | component2 = HD 115404 B | ra2 = {{RA|13|16|51.55401}}<ref name="GaiaDR3B"/> | dec2 = {{DEC|+17|00|59.8921}}<ref name="GaiaDR3B"/> | appmag_v2 = 9.50<ref name=Fabricius/> }} {{Starbox character | component1 = HD 115404 A | type = [[main sequence]]<ref name="GaiaDR3A"/> | class = K2 V<ref name=White>{{cite journal|bibcode=2007AJ....133.2524W|doi=10.1086/514336|arxiv=0706.0542|title=High-Dispersion Optical Spectra of Nearby Stars Younger Than the Sun|journal=The Astronomical Journal|volume=133|issue=6|pages=2524|year=2007|last1=White|first1=Russel J.|last2=Gabor|first2=Jared M.|last3=Hillenbrand|first3=Lynne A.|s2cid=122854}}</ref> | b-v = +0.917<ref name=ubv>{{cite journal | bibcode=2006yCat.2168....0M | title=VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991) | journal=VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie | volume=2168 | last1=Mermilliod | first1=J. C. | year=2006 }}</ref> | u-b = +0.623<ref name=ubv/> | component2 = HD 115404 B | type2 = [[main sequence]]<ref name="GaiaDR3B"/> | class2 = M0.5 V<ref name=AlonsoFloriano>{{cite journal |doi=10.1051/0004-6361/201525803 |title=CARMENES input catalogue of M dwarfs |journal=Astronomy & Astrophysics |volume=577 |pages=A128 |year=2015 |last1=Alonso-Floriano |first1=F. J. |last2=Morales |first2=J. C. |last3=Caballero |first3=J. A. |last4=Montes |first4=D. |last5=Klutsch |first5=A. |last6=Mundt |first6=R. |last7=Cortés-Contreras |first7=M. |last8=Ribas |first8=I. |last9=Reiners |first9=Ansgar |last10=Amado |first10=P. J. |last11=Quirrenbach |first11=A. |last12=Jeffers |first12=S. V. |arxiv=1502.07580 |bibcode=2015A&A...577A.128A |s2cid=53135130 }}</ref> | b-v2 = +1.232<ref name=herrero2012>{{cite journal | display-authors=1 | last1=Herrero | first1=E. | last2=Ribas | first2=I. | last3=Jordi | first3=C. | last4=Guinan | first4=E. F. | last5=Engle | first5=S. G. | title=Optimizing exoplanet transit searches around low-mass stars with inclination constraints | journal=Astronomy & Astrophysics | volume=537 | page=A147 |date=January 2012 | doi=10.1051/0004-6361/201117809 | bibcode=2012A&A...537A.147H | arxiv=1110.5840 | s2cid=119299265 }}</ref> }} {{Starbox astrometry | component1 = HD 115404 A | radial_v = 7.62 ± 0.09<ref name=Maldonaldo>{{cite journal|bibcode=2010A&A...521A..12M|doi=10.1051/0004-6361/201014948|arxiv=1007.1132|title=A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups|journal=Astronomy and Astrophysics|volume=521|pages=A12|year=2010|last1=Maldonado|first1=J.|last2=Martínez-Arnáiz|first2=R. M.|last3=Eiroa|first3=C.|last4=Montes|first4=D.|last5=Montesinos|first5=B.|s2cid=119209183}}</ref> | prop_mo_ra = {{val|636.285|(28)}} | prop_mo_dec = {{val|-264.678|(31)}} | pm_footnote = <ref name="GaiaDR3A"/> | parallax = 91.0176 | p_error = 0.0236 | parallax_footnote = <ref name="GaiaDR3A"/> | absmag_v = +6.3<ref name=allen2014>{{cite journal |last1=Allen |first1=Christine |last2=Monroy-Rodríguez |first2=Miguel A. |title=An Improved Catalog of Halo Wide Binary Candidates |journal=The Astrophysical Journal |date=2014 |volume=790 |issue=2 |page=158 |doi=10.1088/0004-637X/790/2/158 |arxiv=1406.5164 |bibcode=2014ApJ...790..158A }}</ref> | component2 = HD 115404 B | radial_v2 = {{val|5.95|0.13}}<ref name="GaiaDR3B"/> | prop_mo_ra2 = {{val|649.666|(31)}} | prop_mo_dec2 = {{val|-263.937|(26)}} | pm_footnote2 = <ref name="GaiaDR3B"/> | parallax2 = 90.9475 | p_error2 = 0.0232 | parallax_footnote2 = <ref name="GaiaDR3B"/> | absmag_v2 = 10.1<ref name=allen2014/> }} {{Starbox orbit | reference = <ref name=ORB6>{{cite web|url=http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|title=Sixth Catalog of Orbits of Visual Binary Stars|publisher=United States Naval Observatory|access-date=11 August 2017|archive-date=1 August 2017|archive-url=https://web.archive.org/web/20170801102553/http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|url-status=dead}}</ref> | period = 770.0 | axis = 8.06 | inclination = 93.41 | node = 104.66 | periastron = [[Besselian year|B]] 1875.0 | eccentricity = 0.12 | periarg = 276.99 }} {{Starbox detail | component1 = HD 115404 A | mass = {{val|0.70|0.09}}<ref name=Brewer/> | temperature = 4976<ref name=Brewer>{{cite journal|bibcode=2016ApJS..225...32B|doi=10.3847/0067-0049/225/2/32|arxiv=1606.07929|title=Spectral Properties of Cool Stars: Extended Abundance Analysis of 1,617 Planet-Search Stars|journal=The Astrophysical Journal Supplement Series|volume=225|issue=2|pages=32|year=2016|last1=Brewer|first1=John M.|last2=Fischer|first2=Debra A.|last3=Valenti|first3=Jeff A.|last4=Piskunov|first4=Nikolai|s2cid=118507965 |doi-access=free }}</ref> | gravity = {{val|4.58|0.03}}<!-- Isochrone derived --><ref name=Brewer/> | luminosity = 0.32<!-- 10^(-0.49 ± 0.02) --><ref name=Brewer/> | radius = {{val|0.76|0.02}}<ref name=Brewer/> | rotation = 18.2 days<ref name=fuhrmeister2022>{{cite journal |bibcode=2022A&A...661A..24F |title=The corona - chromosphere connection studied with simultaneous eROSITA and TIGRE observations |last1=Fuhrmeister |first1=B. |last2=Czesla |first2=S. |last3=Robrade |first3=J. |last4=González-Pérez |first4=J. N. |last5=Schneider |first5=C. |last6=Mittag |first6=M. |last7=Schmitt |first7=J. H. M. M. |journal=Astronomy and Astrophysics |date=2022 |volume=661 |pages=A24 |doi=10.1051/0004-6361/202141020 |arxiv=2106.14546 }}</ref> | rotational_velocity = 2.8<ref name=Brewer/> | metal_fe = −0.08<ref name=Brewer/> | age_gyr = 10.2 (5.4–13.5)<ref name=Brewer/> | component2 = HD 115404 B | mass2 = 0.542<ref name=Newton>{{cite journal|bibcode=2017ApJ...834...85N|doi=10.3847/1538-4357/834/1/85|arxiv=1611.03509|title=The Hα emission of nearby M dwarfs and its relation to stellar rotation|journal=The Astrophysical Journal|volume=834|pages=85|year=2017|last1=Newton|first1=Elisabeth R.|last2=Irwin|first2=Jonathan|last3=Charbonneau|first3=David|last4=Berlind|first4=Perry|last5=Calkins|first5=Michael L.|last6=Mink|first6=Jessica|issue=1|s2cid=55000202 |doi-access=free }}</ref> | temperature2 = 3,709<ref name=mann2015>{{cite journal|bibcode=2015ApJ...804...64M|arxiv=1501.01635|title=How to Constrain Your M Dwarf: Measuring Effective Temperature, Bolometric Luminosity, Mass, and Radius|journal=The Astrophysical Journal|volume=804|pages=64|last1=Mann|first1=Andrew W.|last2=Feiden|first2=Gregory A.|last3=Gaidos|first3=Eric|last4=Boyajian|first4=Tabetha|last5=von Braun|first5=Kaspar|year=2015|issue=1|doi=10.1088/0004-637X/804/1/64|s2cid=19269312}}</ref> | luminosity2 = 0.043<ref name=luck2017>{{cite journal |bibcode=2017AJ....153...21L |title=Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants |last1=Luck |first1=R. Earle |journal=The Astronomical Journal |date=2017 |volume=153 |issue=1 |page=21 |doi=10.3847/1538-3881/153/1/21 |doi-access=free |arxiv=1611.02897 }}</ref> | radius2 = 0.550<ref name=Newton/> | gravity2 = 4.90<ref name=luck2017/> | rotational_velocity2 = 9.6<ref name=luck2017/> | age_gyr2 = 3.0<ref name=mann2015/> }} {{Starbox catalog | names = {{odlist|GJ=505|BD=+17°2611|HD=115404|HIP=64797|LHS=2713|SAO=100491}}<ref name=SIMBAD>{{cite simbad|title=HD 115404|access-date=11 August 2017}}</ref> }} {{Starbox reference | Simbad = HD+115404 | sn=A | Simbad2 = HD+115404B | sn2=B | ARICNS = 01032 | an=A | ARICNS2 = 01033 | an2 = B | NSTED = HD-115404 }} {{Starbox end}}
'''HD 115404''' is a [[binary star]] system located in the constellation [[Coma Berenices]]. [[Stellar parallax|Parallax]] measurements made by [[Hipparcos]] put the system at 36 light-years, or 11 parsecs, away.<ref name="van Leeuwen2007"/> The combined [[apparent magnitude]] of the system is 6.52,<ref name=SIMBAD/> with the magnitudes of the components being 6.66 and 9.50.<ref name=Fabricius/>
The primary component, designated A, is a [[K-type main sequence star]].<ref name=White/> It is about 70% as massive as the [[Sun]], and is 0.76 times as wide.<ref name=Brewer/> Its companion is a [[red dwarf]] (M0.5 V).<ref name=AlonsoFloriano/> It has 54.2% the mass of the Sun, and is 0.55 times as wide.<ref name=Newton/> The two stars orbit each other every 770 years, and are separated by about 8{{pprime}}.<ref name=ORB6/> The system is thought to be fairly old, at 5.4 to 13.5 billion years old.<ref name=Brewer/>
In 2022, two [[exoplanet]]s, [[ice giant|Neptunian]] and [[Super-Jupiter|super-Jovian]] in mass, were reported in orbit around the primary star using a combination of [[Doppler spectroscopy|radial velocity]] and [[astrometry]].<ref name="Feng2022"/> However, a 2025 study using radial velocity observations failed to detect these planets.<ref name=Harada2025/>
{{Orbitbox planet begin | name = HD 115404 A | table_ref = <ref name="Feng2022"/> }} {{Orbitbox planet hypothetical | status = disputed<ref name=Harada2025/> | exoplanet = b | mass = {{val|0.097|0.020|0.022|p=≥}} | radius = | semimajor = {{val|0.088|0.003|0.004}} | period = {{val|10.5|0.001|0.002}} | eccentricity = {{val|0.232|0.197|0.138}} | inclination = }} {{Orbitbox planet hypothetical | status = disputed<ref name=Harada2025/> | exoplanet = c | mass = {{val|10.319|1.473|1.209}} | radius = | semimajor = {{val|11.364|3.301|1.905}} | period = {{val|15319.2|7240.3|3526.2}} | eccentricity = {{val|0.211|0.173|0.102}} | inclination = {{val|25.791|1.842|2.157}} }} {{Orbitbox end}}
== References == <references> <ref name="van Leeuwen2007">{{cite journal | title=Validation of the new Hipparcos reduction | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | year=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 |s2cid = 18759600}} [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=64577 Vizier catalog entry ]</ref>
<ref name="GaiaDR3A">{{Cite Gaia DR3|3936909723803146368}}</ref> <ref name="GaiaDR3B">{{Cite Gaia DR3|3936909723803146496}}</ref>
<ref name="Feng2022">{{cite journal |last1=Feng |first1=Fabo |last2=Butler |first2=R. Paul |display-authors=etal |date=August 2022 |title=3D Selection of 167 Substellar Companions to Nearby Stars |journal=[[The Astrophysical Journal Supplement Series]] |volume=262 |issue=21 |page=21 |doi=10.3847/1538-4365/ac7e57 |arxiv=2208.12720 |bibcode=2022ApJS..262...21F|s2cid=251864022 |doi-access=free }}</ref>
<ref name=Harada2025> {{cite journal | last1=Harada | first1=Caleb K. | last2=Dressing | first2=Courtney D. | last3=Turtelboom | first3=Emma V. | last4=Kane | first4=Stephen R. | last5=Blunt | first5=Sarah | last6=Dietrich | first6=Jamie | last7=Hinkel | first7=Natalie R. | last8=Li | first8=Zhexing | last9=Mamajek | first9=Eric | last10=Rice | first10=Malena | last11=Tuchow | first11=Noah W. | last12=Wittenmyer | first12=Robert A. | last13=Chin | first13=Christopher | last14=Fernandez | first14=Aidan | last15=Kulkarni | first15=Shivani | last16=Lin | first16=Emerald | last17=Liu | first17=Nykole | last18=Liu | first18=Remy | last19=Nathan | first19=Abhi | last20=Zbriger | first20=Adam | display-authors=3 | title=SPORES-HWO. II. Companion Mass Limits and Updated Planet Properties for 120 Future Exoplanet Imaging Targets from 35 yr of Precise Doppler Monitoring | journal=[[The Astronomical Journal]] | volume=170 | issue=6 | page=343 | date=2025-12-01 | arxiv=2409.10679 | bibcode=2025AJ....170..343H | doi=10.3847/1538-3881/ae0b62 | doi-access=free | issn=0004-6256 }}</ref>
</references>
{{Stars of Coma Berenices}}
[[Category:Coma Berenices]] [[Category:Durchmusterung objects|BD+17 2611]] [[Category:Gliese and GJ objects|0505]] [[Category:Henry Draper Catalogue objects|115404]] [[Category:Hipparcos objects|064797]] [[Category:K-type main-sequence stars]] [[Category:M-type main-sequence stars]] [[Category:Hypothetical planetary systems]] [[Category:Solar-type stars]] [[Category:Binary stars]]