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GJ 1245

{{short description|Triple star system in the constellation Cygnus}}

{{Sky|19|53|54.492|+|44|24|53.41|15.200}}

{{Starbox begin|name=V1581 Cygni}}

{{Starbox image

|image=

{{Location map|100x100|AlternativeMap=Cygnus_constellation_map.svg

|float=center

|alt=GJ 1245 is located in the constellation Cygnus.

|caption=Location of GJ 1245 in the constellation Cygnus|border=infobox|mark=Red_pog.png|width=300

|label=GJ 1245

|lat=59.6

|long=51.2

}}|caption=

}}

{{Starbox observe 2s

| epoch=J2000

| constell=Cygnus

| component1=GJ 1245 AC

| ra1={{RA|19|53|55.142}}

| dec1={{DEC|+44|24|44.39}}

| appmag_v1=13.46 / 16.75

| component2=GJ 1245 B

| ra2={{RA|19|53|55.141}}

| dec2={{DEC|+44|24|54.15}}

| appmag_v2=14.01

}}

{{Starbox character

| class=M6V / M8V / M6V

| b-v=

| u-b=

| variable=UV Cet

}}

{{Starbox astrometry

| radial_v={{val|3.93|0.38}}

| prop_mo_ra={{val|349.363|(56)}}

| prop_mo_dec={{val|-480.322|(54)}}

| pm_footnote=

| parallax=214.5745

| p_error=0.0476

| parallax_footnote=

| absmag_v=15.12 / 18.41 / 15.72

}}

{{Starbox orbit

| reference =

| primary = GJ 1245 A

| name = GJ 1245 C

| period_unitless = {{val|6147|17|fmt=commas}} days

| axis = {{val|0.8267|0.0008}}

| eccentricity = {{val|0.334|0.002}}

| inclination = {{val|135.7|0.1}}

| node = {{val|261.2|0.2}}

| periastron = {{val|51506.8|2.1}}

| periarg = {{val|36.1|0.2}}

}}

{{Starbox detail

| component1=GJ 1245 A

| mass={{val|0.120|0.001}}

| radius={{val|0.146|0.007}}

| luminosity=0.0014

| temperature={{val|2927|fmt=commas}}

| metal_fe=−0.07

| gravity=

| rotation=

| age_myr=~300{{cn|date=August 2016}}

| component2=GJ 1245 C

| mass2={{val|0.081|0.001}}

| radius2={{val|0.087|0.004}}

| luminosity2=0.0003

| temperature2={{val|2611|fmt=commas}}

| metal_fe2=−0.08

}}

{{Starbox detail|no_heading=y

| component1 = GJ 1245 B

| mass=0.115

| temperature=2.865

| luminosity=0.00123

| radius=0.142

| gravity=5.20

| metal_fe=−0.05

| rotation=0.71 days

| rotational_velocity=7

| age_gyr=3.1

}}

{{Starbox catalog

| names = {{odlist | V=V1581 Cyg | GJ=1245 | WDS=J19539+4425}}

| component1 = GJ 1245 AC

| names1 = {{odlist | 2MASS=J19535443+4424541 | G=208-44 | KIC=8451868 | LHS=3494 | NLTT=48414}}

| component2 = GJ 1245 B

| names2 = {{odlist | 2MASS=J19535508+4424550 | G=208-45 | KIC=8451881 | LHS=3495 | NLTT=48415}}

}}

{{Starbox reference

|Simbad2=GJ+1245+A|sn2=AC

|Simbad4=GJ+1245+B|sn4=B

}}

{{Starbox end}}

__NOTOC__

Image:V1581CygLightCurve.png light curve for a flare of V1581 Cygni. The left-most point shows a 1 sigma error bar. Adapted from Cristaldi and Rodonò (1976)]]

GJ 1245 (Gliese 1245) is a double star with components G 208-44 and G 208-45, located {{convert|15.2|ly|pc|lk=on|abbr=off}} away in the constellation Cygnus. G 208-44 is itself a closer double star made up of two red dwarfs, while G 208-45 is also a red dwarf. GJ 1245 is the 43rd closest stellar system to the Solar System. GJ 1245 A and B are both active flare stars, and the pair are collectively designated V1581 Cygni.

The largest of the three stars, GJ 1245 A (G 208-44 A) is only 12% the Sun's mass. Of the other two stars, GJ 1245 C (G 208-44 B), is closest to star A at 2 AU away; it is 8% of the Sun's mass. The third star, GJ 1245 B (G 208-45), is 27 AU away from star A, and is estimated to complete an orbit every 279 years. It is slightly smaller and less luminous than GJ 1245 A.

See also

References

{{reflist|refs=

{{cite simbad |title=G 208-44 |access-date=11 June 2024}}

{{cite simbad |title=G 208-45 |access-date=11 June 2024}}

{{Cite Gaia DR3|2079074130463898624}}

{{Cite Gaia DR3|2079073928612821760}}

{{cite constellation|GJ 1245}}

{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}

{{cite journal |last1=Cristaldi |first1=S. |last2=Rodonò |first2=M. |title=Discovery of Flare Activity in the Visual Binary G 208-44/45 |journal=Astronomy and Astrophysics |date=April 1976 |volume=48 |page=165 |bibcode=1976A&A....48..165C }}

{{cite journal |bibcode=2010MNRAS.407.2269M |title=Large-scale magnetic topologies of late M dwarfs |last1=Morin |first1=J. |last2=Donati |first2=J. -F. |last3=Petit |first3=P. |last4=Delfosse |first4=X. |last5=Forveille |first5=T. |last6=Jardine |first6=M. M. |journal=Monthly Notices of the Royal Astronomical Society |date=2010 |volume=407 |issue=4 |page=2269 |doi=10.1111/j.1365-2966.2010.17101.x |doi-access=free |arxiv=1005.5552 }}

{{cite journal |bibcode=2015ApJ...804...64M |title=How to Constrain Your M Dwarf: Measuring Effective Temperature, Bolometric Luminosity, Mass, and Radius |last1=Mann |first1=Andrew W. |last2=Feiden |first2=Gregory A. |last3=Gaidos |first3=Eric |last4=Boyajian |first4=Tabetha |last5=von Braun |first5=Kaspar |journal=The Astrophysical Journal |date=2015 |volume=804 |issue=1 |page=64 |doi=10.1088/0004-637X/804/1/64 |arxiv=1501.01635 }}

{{cite journal |bibcode=2019AJ....158..138S |title=The Revised TESS Input Catalog and Candidate Target List |last1=Stassun |first1=Keivan G. |last2=Oelkers |first2=Ryan J. |last3=Paegert |first3=Martin |last4=Torres |first4=Guillermo |last5=Pepper |first5=Joshua |last6=De Lee |first6=Nathan |last7=Collins |first7=Kevin |last8=Latham |first8=David W. |last9=Muirhead |first9=Philip S. |last10=Chittidi |first10=Jay |last11=Rojas-Ayala |first11=Bárbara |last12=Fleming |first12=Scott W. |last13=Rose |first13=Mark E. |last14=Tenenbaum |first14=Peter |last15=Ting |first15=Eric B. |last16=Kane |first16=Stephen R. |last17=Barclay |first17=Thomas |last18=Bean |first18=Jacob L. |last19=Brassuer |first19=C. E. |last20=Charbonneau |first20=David |last21=Ge |first21=Jian |last22=Lissauer |first22=Jack J. |last23=Mann |first23=Andrew W. |last24=McLean |first24=Brian |last25=Mullally |first25=Susan |last26=Narita |first26=Norio |last27=Plavchan |first27=Peter |last28=Ricker |first28=George R. |last29=Sasselov |first29=Dimitar |last30=Seager |first30=S. |journal=The Astronomical Journal |date=2019 |volume=158 |issue=4 |page=138 |doi=10.3847/1538-3881/ab3467 |doi-access=free |arxiv=1905.10694 |display-authors=1 }}

{{cite journal|bibcode=1978IBVS.1414....1K|title=63rd Name-List of Variable Stars|journal=Information Bulletin on Variable Stars|volume=1414|pages=1|last1=Kholopov|first1=P. N.|last2=Kukarkina|first2=N. P.|last3=Perova|first3=N. B.|year=1978}}

{{cite web

| title=The One Hundred Nearest Star Systems | work=RECONS

| url=http://www.recons.org/TOP100.posted.htm

| access-date=2016-08-21

}}

{{cite journal|bibcode=2015ApJ...800...95L|arxiv=1412.6109|title=Kepler Flares III: Stellar Activity on GJ 1245A and B|journal=The Astrophysical Journal|volume=800|issue=2|pages=95|last1=Lurie|first1=John C.|last2=Davenport|first2=James R. A.|last3=Hawley|first3=Suzanne L.|last4=Wilkinson|first4=Tessa D.|last5=Wisniewski|first5=John P.|last6=Kowalski|first6=Adam F.|last7=Hebb|first7=Leslie|year=2015|doi=10.1088/0004-637X/800/2/95|s2cid=51773906}}

{{cite journal |last1=Benedict |first1=G. F. |last2=Henry |first2=T. J. |display-authors=etal |date=November 2016 |title=The Solar Neighborhood. XXXVII: The Mass-Luminosity Relation for Main-sequence M Dwarfs |journal=The Astronomical Journal |volume=152 |issue=5 |pages=141 |doi=10.3847/0004-6256/152/5/141 |doi-access=free |arxiv=1608.04775 |bibcode=2016AJ....152..141B}}

{{cite journal |last1=Dieterich |first1=Serge B. |last2=Simler |first2=Andrew |last3=Henry |first3=Todd J. |last4=Jao |first4=Wei-Chun |date=April 2021 |title=The Solar Neighborhood. XLVII. Comparing M-dwarf Models with Hubble Space Telescope Dynamical Masses and Spectroscopy |journal=The Astronomical Journal |volume=161 |issue=4 |pages=172 |doi=10.3847/1538-3881/abd2c2 |doi-access=free |arxiv=2012.00915 |bibcode=2021AJ....161..172D}}

{{cite journal |first1=Céline |last1=Reylé |first2=Kevin |last2=Jardine |first3=Pascal |last3=Fouqué |first4=Jose A. |last4=Caballero |first5=Richard L. |last5=Smart |first6=Alessandro |last6=Sozzetti |date=30 April 2021 |title=The 10 parsec sample in the Gaia era |journal=Astronomy & Astrophysics |volume=650 |issue= |pages=A201 |doi=10.1051/0004-6361/202140985 |arxiv=2104.14972 |bibcode=2021A&A...650A.201R|s2cid=233476431 }} Data available at https://gruze.org/10pc/ {{Webarchive|url=https://web.archive.org/web/20230312171927/http://gruze.org/10pc/ |date=12 March 2023 }}

{{cite journal |last1=Salama |first1=Maïssa |last2=Ou |first2=James |display-authors=etal |date=September 2021 |title=Large Adaptive Optics Survey for Substellar Objects around Young, Nearby, Low-mass Stars with Robo-AO |journal=The Astronomical Journal |volume=162 |issue=3 |pages=102 |doi=10.3847/1538-3881/ac0445 |doi-access=free |arxiv=2105.13364 |bibcode=2021AJ....162..102S}}

{{cite journal |bibcode=2018ApJS..235....6T |title=The Updated Multiple Star Catalog |last1=Tokovinin |first1=Andrei |journal=The Astrophysical Journal Supplement Series |date=2018 |volume=235 |issue=1 |page=6 |doi=10.3847/1538-4365/aaa1a5 |doi-access=free |arxiv=1712.04750 }}

}}

Further reading

  • {{cite journal |last1=Harrington |first1=R. S. |last2=Dahn |first2=C. C. |last3=Kallarakal |first3=V. V. |last4=Guetter |first4=H. H. |last5=Riepe |first5=B. Y. |last6=Walker |first6=R. L. |last7=Pier |first7=J. R. |last8=Vrba |first8=F. J. |last9=Luginbuhl |first9=C. B. |last10=Harris |first10=H. C. |last11=Ables |first11=H. D. |title=U.S. Naval Observatory photographic parallaxes - List IX |year=1993 |journal=Astronomical Journal |volume=105 | issue=4 | pages=1571–1580 |doi=10.1086/116537 |bibcode=1993AJ....105.1571H}}
  • {{cite journal |last1=Henry |first1=Todd J. |title=The Solar Neighborhood. X. New Nearby Stars in the Southern Sky and Accurate Photometric Distance Estimates for Red Dwarfs |year=2004 |journal=The Astronomical Journal |volume=128 | issue=5 | pages=2460–2473 |arxiv=astro-ph/0408240 |doi=10.1086/425052 |bibcode=2004AJ....128.2460H|last2=Subasavage |first2=John P. |last3=Brown |first3=Misty A. |last4=Beaulieu |first4=Thomas D. |last5=Jao |first5=Wei-Chun |last6=Hambly |first6=Nigel C. |s2cid=15759789 }}
  • {{cite journal |last1=Smart |first1=R. L. |last2=Ioannidis |first2=G. |last3=Jones |first3=H. R. A. |last4=Bucciarelli |first4=B. |last5=Lattanzi |first5=M. G. |title=Cool dwarfs stars from the Torino Observatory Parallax Program |year=2010 |journal=Astronomy and Astrophysics |volume=514 | pages=A84 |arxiv=1003.1465 |doi=10.1051/0004-6361/200913424 |bibcode=2010A&A...514A..84S|s2cid=17961025 }}
  • {{cite journal |last1=Dittmann |first1=Jason A. |title=Trigonometric Parallaxes for 1507 Nearby Mid-to-late M Dwarfs |year=2014 |journal=The Astrophysical Journal |volume=784 | issue=2 | pages=156 |arxiv=1312.3241 |doi=10.1088/0004-637X/784/2/156 |bibcode=2014ApJ...784..156D|last2=Irwin |first2=Jonathan M. |last3=Charbonneau |first3=David |last4=Berta-Thompson |first4=Zachory K. |s2cid=18789867 }} [https://www.cfa.harvard.edu/MEarth/MEarth_Parallaxes.txt Table with parallaxes].

External links

  • http://jumk.de/astronomie/near-stars/v1581-cygni.shtml
  • http://www.answers.com/topic/list-of-nearest-stars?cat=travel
  • http://www.richweb.f9.co.uk/astro/nearby_stars.htm

{{nearest systems|3}}

{{Stars of Cygnus}}

Category:Local Bubble

Category:Triple star systems

Category:Cygnus (constellation)

1245

Cygni, V1581

Category:M-type main-sequence stars

Category:Ursa Major moving group