HD 156768

{{Starbox begin

| name=HD 156768

}}

{{Starbox observe 2s

| constell=Ara

| epoch=J2000

| component1 = A

| ra1={{RA|17|22|55.22140}}

| dec1={{DEC|-58|00|37.1789}}

| appmag_v1=6.1

| component2 = B

| ra2={{RA|17|22|55.20446}}

| dec2={{DEC|-58|00|38.9718}}

| appmag_v2=9.6

}}

{{Starbox character

| component1 = A

| class=G8Ib/II

| r-i =

| v-r =

| b-v = +1.07

| u-b = +0.86

| variable=

| component2 = B

| class2 =

| r-i2 =

| v-r2 =

| b-v2 = +0.39

| u-b2 =

| variable2 =

}}

{{Starbox astrometry

| absmag_v=−1.69

}}

{{Starbox astrometry|no_heading=y

| component1 = A

| radial_v={{val|−9.42|0.13}}

| prop_mo_ra=−5.959

| prop_mo_dec=−15.651

| parallax=3.1386

| p_error=0.0412

| parallax_footnote=

| component2 = B

| radial_v2={{val|-9.80|0.20}}

| prop_mo_ra2=−6.006

| prop_mo_dec2=−14.316

| parallax2=2.9305

| p_error2=0.0404

| parallax_footnote2=

| absmag_v2=

}}

{{Starbox detail

| component1 = HD 156768 A

| mass=4.5

| radius=37

| luminosity=527

| temperature=4,580

| gravity=1.76

| metal_fe=

| rotational_velocity={{val|2.6|1.0}}

| age_myr=

| component2 = HD 156768 B

| mass2=1.6

| radius2=

| luminosity2=

| temperature2=6,592

| gravity2=3.79

| metal_fe2=−0.11

| rotational_velocity2=

| age_myr2=

}}

{{Starbox catalog

| names=CPD−57°8478, HD 156768, HIP 85049, HR 6438, SAO 244678

}}

{{Starbox reference

| Simbad=HD+156768

}}

HD 156768 is a double star in the southern constellation of Ara, with a combined apparent magnitude of 5.86. The brighter component is a sixth magnitude bright giant or supergiant star with a stellar classification of G8Ib/II. The magnitude 9.6 companion lies at an angular separation of 1.81″ along a position angle of 184°.

References

{{reflist|refs=

{{cite journal

| title=The Tycho double star catalogue

| last1=Fabricius | first1=C. | last2=Høg | first2=E.

| last3=Makarov | first3=V. V. | last4=Mason | first4=B. D.

| last5=Wycoff | first5=G. L. | last6=Urban | first6=S. E.

| display-authors=1 | journal=Astronomy and Astrophysics

| volume=384 | pages=180–189 | date=2002

| doi=10.1051/0004-6361:20011822|doi-access=free

| bibcode=2002A&A...384..180F }}

{{Cite journal| doi = 10.1134/S1063773706110065| bibcode=2006AstL...32..759G| title = Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system| journal = Astronomy Letters| volume = 32| issue = 11| pages = 759–771| date = November 2006| last1 = Gontcharov | first1 = G. A.|arxiv = 1606.08053 | s2cid=119231169}}

{{citation

| last1=Houk | first1=Nancy

| last2=Cowley | first2=A. P.

| title=Michigan catalogue of two-dimensional spectral types for the HD stars

| journal=Ann Arbor: Dept. Of Astronomy

| publication-place=Ann Arbor, Michigan

| publisher=Dept. of Astronomy, University of Michigan

| year=1979 | volume=1

| bibcode=1978mcts.book.....H

| postscript=.

}}

{{cite journal|bibcode=2007AN....328..889K|title=Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations|journal=Astronomische Nachrichten|volume=328|issue=9|pages=889|last1=Kharchenko|first1=N. V.|last2=Scholz|first2=R.-D.|last3=Piskunov|first3=A. E.|last4=Röser|first4=S.|last5=Schilbach|first5=E.|year=2007|doi=10.1002/asna.200710776|arxiv = 0705.0878 |s2cid=119323941}}

{{citation

| last1=Nicolet | first1=B.

| title=Photoelectric photometric Catalogue of homogeneous measurements in the UBV System

| journal=Astronomy and Astrophysics Supplement Series

| volume=34 | pages=1–49 | date=1978

| bibcode=1978A&AS...34....1N

}}

{{cite journal |bibcode=2022yCat.1354....0A |title=VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022) |last1=Anders |first1=F. |last2=Khalatyan |first2=A. |last3=Queiroz |first3=A. B. A. |last4=Chiappini |first4=C. |last5=Ardevol |first5=J. |last6=Casamiquela |first6=L. |last7=Figueras |first7=F. |last8=Jimenez-Arranz |first8=O. |last9=Jordi |first9=C. |last10=Monguio |first10=M. |last11=Romero-Gomez |first11=M. |last12=Altamirano |first12=D. |last13=Antoja |first13=T. |last14=Assaad |first14=R. |last15=Cantat-Gaudin |first15=T. |last16=Castro-Ginard |first16=A. |last17=Enke |first17=H. |last18=Girardi |first18=L. |last19=Guiglion |first19=G. |last20=Khan |first20=S. |last21=Luri |first21=X. |last22=Miglio |first22=A. |last23=Minchev |first23=I. |last24=Ramos |first24=P. |last25=Santiago |first25=B. X. |last26=Steinmetz |first26=M. |journal=Vizier Online Data Catalog |year=2022 }}

{{citation

| display-authors=1

| last1=De Medeiros | first1=J. R.

| last2=Udry | first2=S.

| last3=Burki | first3=G.

| last4=Mayor | first4=M.

| title=A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars

| journal=Astronomy and Astrophysics

| volume=395 | pages=97–98 | date=November 2002

| doi=10.1051/0004-6361:20021214

| bibcode=2002A&A...395...97D

| arxiv=1312.3474

}}

{{citation

| last1=Fabricius | first1=C.

| last2=Makarov | first2=V. V.

| title=Two-colour photometry for 9473 components of close Hipparcos double and multiple stars

| journal=Astronomy and Astrophysics | volume=356 | pages=141–145

|date=April 2000

| bibcode=2000A&A...356..141F

| postscript=.

}}

External links

[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%206438 HR 6438]
[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?CCDM%20J17229-5801AB CCDM J17229-5801]
[http://aladin.u-strasbg.fr/AladinPreview?-c=17+22+55.2219-58+00+37.178&ident=CCDM+J17229-5801AB&submit=Aladin+previewer Image HD 156768]

Category:Ara (constellation)

Category:Double stars

Category:G-type supergiants

Category:Durchmusterung objects

156768

6438

085049