68 Aquilae

{{Starbox begin

| name = 68 Aquilae

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|20|28|24.904}}

| dec = {{DEC|-03|21|28.05}}

| appmag_v = 6.12

| constell = Aquila

}}

{{Starbox character

| type = main sequence

| class = B9 V:

| b-v = −0.06

| u-b = −0.20

| variable =

}}

{{Starbox astrometry

| radial_v = −9

| prop_mo_ra = +27.242

| prop_mo_dec = −19.118

| pm_footnote =

| parallax = 5.9286

| p_error = 0.052

| parallax_footnote =

| absmag_v =

}}

{{Starbox detail

| mass = {{Val|3.16|0.12}}

| radius = 3.361{{±|0.168}}

| luminosity = {{Val|159.8|29.9|25.2}}

| temperature = {{Val|10641|50|49|fmt=commas}}

| metal_fe =

| rotational_velocity = 138

| age_myr =

}}

{{Starbox catalog

| names = {{odlist | F=68 Aql | BD=−03°4906 | FK5= | HD=194939 | HIP=100977 | HR=7821 | SAO=144468 | WDS=J20284-0321A }}

}}

{{Starbox reference

| Simbad=68+Aql

}}

68 Aquilae (abbreviated 68 Aql) is a double star in the equatorial constellation of Aquila. 68 Aquilae is its Flamsteed designation. It has an apparent visual magnitude of 6.12, which is dimly visible to the naked eye under favorable viewing conditions. The distance to the brighter component is approximately 550 light years based on parallax measurements, and it is drifting further away with a heliocentric radial velocity of –9 km/s.

The stellar classification of the brighter component is B9 V:, matching a B-type main-sequence star. However, the ':' suffix indicates some uncertainty in the classification. It has an estimated 3.2 times the mass of the Sun and 3.4 times the Sun's radius. 68 Aquilae is radiating 160 times the Sun's luminosity from its photosphere at an effective temperature of 10,641 K. The star is spinning rapidly with a projected rotational velocity of 138 km/s.

There is a companion star at a projected separation of {{val|9.00|ul=arcsecond}} as of 2013. It was first reported in 1939 by R. A. Rossiter when the separation was measured at {{val|9.8|u=arcsecond}}. This star has a visual magnitude of 13.70.

References

{{reflist|refs=

{{citation | display-authors=1 | last1=Cowley | first1=A. | last2=Cowley | first2=C. | last3=Jaschek | first3=M. | last4=Jaschek | first4=C. | title=A study of the bright A stars. I. A catalogue of spectral classifications | journal=Astronomical Journal | volume=74 | pages=375–406 |date=April 1969 | doi=10.1086/110819 | bibcode=1969AJ.....74..375C | postscript=. }}

{{citation | last=Evans | first=D. S. | date=June 20–24, 1966 | editor1-last=Batten | editor1-first=Alan Henry | editor2-last=Heard | editor2-first=John Frederick | contribution=The Revision of the General Catalogue of Radial Velocities | title=Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 | volume=30 | page=57 | location=University of Toronto | publisher=International Astronomical Union | bibcode=1967IAUS...30...57E | postscript=. }}

{{citation

| title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities

| journal=Astronomy & Astrophysics

| last1=Zorec | first1=J. | last2=Royer | first2=F.

| volume=537 | pages=A120 | year=2012

| doi=10.1051/0004-6361/201117691 | arxiv=1201.2052

| bibcode=2012A&A...537A.120Z | s2cid=55586789

| postscript=. }}

{{citation | last1=Royer | first1=F. | last2=Zorec | first2=J. | last3=Gómez | first3=A. E. | title=Rotational velocities of A-type stars. III. Velocity distributions | journal=Astronomy and Astrophysics | volume=463 | issue=2 | pages=671–682 |date=February 2007 | doi=10.1051/0004-6361:20065224 | bibcode=2007A&A...463..671R | arxiv=astro-ph/0610785 | s2cid=18475298 | postscript=. }}

{{citation | title=68 Aql -- Star in double system | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=68+Aquilae | access-date=2012-07-26 | postscript=. }}

{{citation

| title=The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog

| display-authors=1 | last1=Mason | first1=Brian D.

| last2=Wycoff | first2=Gary L. | last3=Hartkopf | first3=William I.

| last4=Douglass | first4=Geoffrey G. | last5=Worley | first5=Charles E.

| journal=The Astronomical Journal

| volume=122 | issue=6 | pages=3466 | year=2001

| doi=10.1086/323920 | doi-access=free

| bibcode=2001AJ....122.3466M }}

{{citation

| title=Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly

| last1=Kervella | first1=Pierre | last2=Arenou | first2=Frédéric

| last3=Mignard | first3=François | last4=Thévenin | first4=Frédéric

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

| volume=623 | id=A72 | pages=23 | date=March 2019

| arxiv=1811.08902 | bibcode=2019A&A...623A..72K

| doi=10.1051/0004-6361/201834371 | s2cid=119491061 | postscript=. }}

}}

External links

[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%207821 HR 7821]
[http://aladin.u-strasbg.fr/AladinPreview?-c=20+28+24.9053-03+21+28.058&ident=*++68+Aql&submit=Aladin+previewer Image 68 Aquilae]

Category:B-type main-sequence stars

Category:Double stars

Category:Aquila (constellation)

Category:Durchmusterung objects