42 Aquilae

{{Starbox begin

| name = 42 Aquilae

}}

{{Starbox observe

| epoch = J2000

| constell = Aquila

| ra = {{RA|19|37|47.31770}}

| dec = {{DEC|−04|38|51.5072}}

| appmag_v = 5.45

}}

{{Starbox character

| class = F3 IV/V

| b-v = {{Val|0.429|0.003}}

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|−37.6|1.8}}

| prop_mo_ra = +105.381

| prop_mo_dec = –53.557

| parallax = 31.1671

| p_error = 0.1422

| parallax_footnote =

| absmag_v = 2.98

}}

{{Starbox detail

| source =

| mass = 1.26

| radius =

| luminosity = 5.76

| temperature = {{Val|6749|80|fmt=commas}}

| metal_fe = 0.17

| gravity = 4.00

| rotational_velocity = {{Val|87.0|4.4}}

| age_gyr = 1.283

}}

{{Starbox catalog

| names = {{odlist | F=42 Aql | BD=−04°4861 | FK5= | HD=185124 | HIP=96556 | HR=7460 | SAO=143621 }}

}}

{{Starbox reference

| Simbad = 42+Aql

}}

42 Aquilae, abbreviated 42 Aql, is a single star in the equatorial constellation of Aquila. 42 Aquilae is its Flamsteed designation. It is a dim star but visible to the naked eye under suitable viewing conditions, having an apparent visual magnitude of 5.45. 42 Aql is located some 104.6 light years away, as determined from its annual parallax shift of {{Val|31.2|ul=mas}}. it is moving closer to the Earth with a heliocentric radial velocity of −38 km/s, and is predicted to come to within {{Convert|16.04|pc|ly|0|abbr=off|disp=out}} of the Sun in around 752,000 years.

The stellar classification of this star is F3 IV/V, which matches an F-type star with blended spectral traits of a main sequence star and a subgiant star. It is around 1.3 billion years old with a relatively high rate of rotation, having a projected rotational velocity of 87 km/s. The star has 1.26 times the mass of the Sun and is radiating 5.76 times the Sun's luminosity from its photosphere at an effective temperature of 6,749 K. These coordinates are a source of X-ray emission, which is most likely (99.3% chance) coming from the star.

References

{{reflist|refs=

{{citation

| last1=Houk | first1=N. | last2=Swift | first2=C.

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

| journal=Michigan Spectral Survey

| volume=5 | year=1999 | postscript=.

| bibcode=1999MSS...C05....0H }}

{{citation

| last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A.

| title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets

| journal=The Astrophysical Journal

| volume=804 | issue=2 | pages=146 | year=2015

| bibcode=2015ApJ...804..146D | doi=10.1088/0004-637X/804/2/146

| arxiv=1501.03154 | s2cid=33401607 | postscript=. }}

{{citation

| last1=Ammler-von Eiff | first1=Matthias | last2=Reiners | first2=Ansgar

| title=New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?

| journal=Astronomy & Astrophysics | arxiv=1204.2459

| volume=542 | page=A116 | date=June 2012 | postscript=.

| doi=10.1051/0004-6361/201118724 | bibcode=2012A&A...542A.116A | s2cid=53666672 }}

{{citation | display-authors=1

| last1=Casagrande | first1=L. | last2=Schönrich | first2=R.

| last3=Asplund | first3=M. | last4=Cassisi | first4=S.

| last5=Ramírez | first5=I. | last6=Meléndez | first6=J.

| last7=Bensby | first7=T. | last8=Feltzing | first8=S.

| title=New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey

| journal=Astronomy and Astrophysics

| volume=530 | page=A138 | date=June 2011

| doi=10.1051/0004-6361/201016276 | arxiv=1103.4651

| bibcode=2011A&A...530A.138C | s2cid=56118016 | postscript=. }}

{{citation

| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.

| title=A catalogue of multiplicity among bright stellar systems

| journal=Monthly Notices of the Royal Astronomical Society

| volume=389 | issue=2 | pages=869–879 | date=September 2008

| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | arxiv=0806.2878

| bibcode=2008MNRAS.389..869E | s2cid=14878976 | postscript=. }}

{{citation