26 Draconis

{{Short description|Star in the constellation Draco}}

{{Starbox begin

| name=26 Draconis

}}

{{Starbox observe 2s

| epoch=J2000

| constell=Draco

| component1=AB

| ra1={{RA|17|34|59.62474}}

| dec1={{DEC|+61|52|28.2418}}

| appmag_v1=5.236

| component2=C

| ra2={{RA|17|35|34.47852}}

| dec2={{DEC|+61|40|53.6281}}

| appmag_v2=9.97

}}

{{Starbox character

| component1=AB

| class=G0Va (F9V + K3V)

| b-v=+0.595

| u-b=+0.100

| variable=

| component2=C

| class2=M0.5V

| b-v2=+1.48

}}

{{Starbox astrometry

| component1=AB

| radial_v={{val|-15.72|0.33}}

| prop_mo_ra=236.247

| prop_mo_dec=-466.111

| pm_footnote=

| parallax=69.2832

| p_error=0.2004

| parallax_footnote=

| absmag_v={{Val|4.58|0.011}}

| component2=C

| radial_v2={{val|-15.53|0.16}}

| prop_mo_ra2=261.923

| prop_mo_dec2=-514.499

| pm_footnote2=

| parallax2=69.8921

| p_error2=0.0153

| parallax_footnote2=

}}

{{Starbox orbit

| reference = {{cite web|url=http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|title=Sixth Catalog of Orbits of Visual Binary Stars|work=United States Naval Observatory|accessdate=25 March 2017|archive-date=30 April 2017|archive-url=https://web.archive.org/web/20170430161106/http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6|url-status=dead}}

| primary = 26 Dra A

| name = 26 Dra B

| period = 76.1

| axis = 1.53

| inclination = 104

| node = 151

| periastron = 1947

| eccentricity = 0.18

| periarg = 307

}}

{{Starbox detail

| component1=AB

| mass=1.30/0.83

| radius=

| luminosity=

| temperature=6,000

| metal_fe=-0.18

| rotation=

| rotational_velocity=10

| gravity=4.50

| age_gyr=8.4–11.5

| component2=C

| mass2={{val|0.55|0.06}}

| radius2={{val|0.54|0.05}}

| gravity2={{val|4.72|0.05}}

| temperature2={{val|3816|69}}

| metal_fe2={{val|−0.15|0.09}}

| rotation2={{val|18.15|0.15|0.16|ul=d}}

| rotational_velocity2={{val|1.33|0.42}}

}}

{{Starbox catalog

| names={{odlist | ADS=10660 | CCDM=J17351+6152 | WDS=J17350+6153}}

| component1=AB

| names1={{odlist | F=26 Dra | BD=+61 1678 | GJ=684 | HD=160269 | HIP=86036 | HR=6573 | LHS=3305 | LTT=15223 | SAO=17546}}

| component2=C

| names2={{odlist | G=226-66 | GJ=685 | HIP=86087 | LHS=3306 | LTT=15224}}

}}

{{Starbox reference

| Simbad = 26+Dra|sn=A

| Simbad2 = 26+Dra+B|sn2=B

| Simbad3 = GJ+685|sn3=C

}}

{{Starbox end}}

26 Draconis is a triple star system{{cite journal

| author=Greaves, J. S.

| author2=Wyatt, M. C. |date=November 2003

| title=Some anomalies in the occurrence of debris discs around main-sequence A and G stars

| journal=Monthly Notices of the Royal Astronomical Society | volume=345 | issue=4 | pages=1212–1222

| doi=10.1046/j.1365-2966.2003.07037.x

| bibcode=2003MNRAS.345.1212G | doi-access=free}} in the constellation Draco, located 47 light-years from the Sun. Two of the system components, A and B, form a spectroscopic binary that completes an orbit every 76 years. The composite spectral classification of the AB pair is G0V, which decomposes to individual spectral types F9V and K3V. A 1962 study estimated the masses of these two stars as 1.30 and 0.83 times the mass of the Sun, respectively. The stars are considered moderately metal-poor compared to the Sun, which means they have a lower proportion of elements other than hydrogen or helium.{{cite journal

| last1=Makarov

| first1=V. V.

| last2=Zacharias

| first2=N.

| last3=Hennessy

| first3=G. S.

| title=Common Proper Motion Companions to Nearby Stars: Ages and Evolution

| journal=The Astrophysical Journal | volume=687

| issue=1 | pages=566–578 |date=November 2008

| doi=10.1086/591638 | bibcode=2008ApJ...687..566M |arxiv = 0808.3414 | s2cid=17811620

}}

The space velocity components of 26 Draconis are U = +36.5, V = −4.3 and W = −21.8 km/s.{{cite journal

| author=Soderblom, David R.

| author2=Mayor, Michel |date=January 1993

| title=Stellar kinematic groups. I - The Ursa Major group

| journal=Astronomical Journal | volume=105| issue=1

| pages=226–249

| doi=10.1086/116422 | bibcode=1993AJ....105..226S | doi-access=free}} This system is on an orbit through the Milky Way galaxy that has an eccentricity of 0.14, taking it as close as {{Convert|23.1|kly|kpc|abbr=on|sigfig=3}} and as far as {{Convert|30.4|kly|kpc|abbr=on|sigfig=3}} from the galactic core. The inclination of this orbit carries the star system as much as {{Convert|0.75|kly|kpc|abbr=on|sigfig=2}} above the plane of the galactic disk.{{cite journal

| author=Holmberg, J.

| author2=Nordström, B.

| author3=Andersen, J.

| title=The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics

| journal=Astronomy and Astrophysics

| volume=501 | issue=3 |date=July 2009

| pages=941–947 | doi=10.1051/0004-6361/200811191 | bibcode=2009A&A...501..941H|arxiv = 0811.3982 | s2cid=118577511

}} This system may be a member of the Ursa Major moving group.{{cite journal

| author=Greaves, J. S.

| author2=Wyatt, M. C.

| author3=Bryden, G.

| title=Debris discs around nearby solar analogues

| journal=Monthly Notices of the Royal Astronomical Society | volume=397 | issue=2 |date=August 2009

| pages=757–762(6) | doi=10.1111/j.1365-2966.2009.15048.x | doi-access=free

| bibcode=2009MNRAS.397..757G|arxiv = 0907.3677 | s2cid=17758971

}}