15 Aquilae

{{Starbox begin

| name = 15 Aquilae

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|19|04|57.67233}}

| dec = {{DEC|-04|01|53.1059}}

| appmag_v = 5.41

| constell = Aquila

}}

{{Starbox character

| class = K1 III

| b-v = +1.12

| u-b = +1.01

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|-23.17|0.61}}

| prop_mo_ra = +21.90

| prop_mo_dec = −26.05

| parallax = 11.27

| p_error = 0.36

| parallax_footnote =

| absmag_v = 0.414

}}

{{Starbox detail

| mass =

| radius = 14

| luminosity = 83

| temperature = 4,560

| metal_fe = −0.25

| gravity = 2.65

| rotational_velocity = 3.4

| age_gyr = {{nowrap|4.09 ± 2.07}}

}}

{{Starbox catalog

| names = {{odlist | B=h Aquilae | AAVSO=1859-04 | BD=-04°4684 | HD=177463 | HIP=93717 | HR=7225 | SAO=142996 }}

}}

{{Starbox reference

| Simbad=15+Aql

}}

15 Aquilae (abbreviated 15 Aql) is a star in the equatorial constellation of Aquila. 15 Aquilae is the Flamsteed designation; it also bears the Bayer designation h Aquilae. The apparent visual magnitude is 5.41, so it is faintly visible to the naked eye. An optical companion, HD 177442, is 39 arc seconds away from it The distance to 15 Aquilae can be estimated from its annual parallax shift of 11.27 mas, yielding a range of approximately {{Convert|289|ly|pc|abbr=off|lk=on}} from Earth with a 9 light-year margin of error.

With a stellar classification of K1 III, the spectrum of 15 Aquilae matches a giant star with an age of roughly four billion years. At this stage of its evolution, the outer atmosphere of the star has expanded to 14 times the radius of the Sun. It is radiating 83 times the Sun's luminosity into space at an effective temperature of 4,560 K. This heat gives it the orange-hued glow of a K-type star.

This star is most likely a member of the thin disk population of the Milky Way. It is orbiting through the galaxy with an eccentricity of 0.06, which carries it as close as {{Convert|24.30|kly|kpc|abbr=on|lk=on}} to the Galactic Center, and as far away as {{Convert|27.60|kly|kpc|abbr=on}}. The orbital inclination carries it no more than {{Convert|196|ly|pc|abbr=on|lk=off}} from the galactic plane.

References

{{reflist|refs=

{{citation | first=F. | last=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | postscript=. |arxiv = 0708.1752 | s2cid=18759600 }}

{{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 | doi=10.1111/j.1365-2966.2008.13596.x | bibcode=2008MNRAS.389..869E |arxiv = 0806.2878 |date=September 2008| doi-access=free | s2cid=14878976 | postscript=. }}

{{citation | display-authors=1 | last1=Frasca | first1=A. | last2=Covino | first2=E. | last3=Spezzi | first3=L. | last4=Alcalá | first4=J. M. | last5=Marilli | first5=E. | last6=Fżrész | first6=G. | last7=Gandolfi | first7=D. | title=REM near-IR and optical photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters | journal=Astronomy and Astrophysics | volume=508 | issue=3 | pages=1313–1330 | doi=10.1051/0004-6361/200913327 | bibcode=2009A&A...508.1313F | postscript=. |date=December 2009| arxiv=0911.0760 | s2cid=118361131 }}

{{citation | display-authors=1 | last1=Massarotti | first1=Alessandro | last2=Latham | first2=David W. | last3=Stefanik | first3=Robert P. | last4=Fogel | first4=Jeffrey | title=Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity | journal=The Astronomical Journal | volume=135 | issue=1 | pages=209–231 | doi=10.1088/0004-6256/135/1/209 | bibcode=2008AJ....135..209M | postscript=. |date=January 2008| s2cid=121883397 | doi-access=free }}

{{citation | last1=Cousins | first1=A. W. J. | title=Photometric Data for Stars in the Equatorial Zone (Seventh List) | journal=Monthly Notes of the Astronomical Society of Southern Africa | volume=23 | page=175 | year=1964 | bibcode=1964MNSSA..23..175C | postscript=. }}

{{citation | display-authors=1 | last1=Soubiran | first1=C. | last2=Bienaymé | first2=O. | last3=Mishenina | first3=T. V. | last4=Kovtyukh | first4=V. V. | title=Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants | journal=Astronomy and Astrophysics | year=2008 | volume=480 | issue=1 | pages=91–101 | bibcode=2008A&A...480...91S | doi=10.1051/0004-6361:20078788 | postscript=. |arxiv = 0712.1370 | s2cid=16602121 }}

{{cite simbad | title=15 Aql | access-date=2012-07-22 | postscript=. | mode=cs2 }}

{{citation|title=The Colour of Stars |date=December 21, 2004 |work=Australia Telescope, Outreach and Education |publisher=Commonwealth Scientific and Industrial Research Organisation |url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |access-date=2012-07-21 |postscript=. |url-status=dead |archive-url=https://web.archive.org/web/20120222183238/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |archive-date=February 22, 2012 }}

}}

External links

[http://aladin.u-strasbg.fr/AladinPreview?-c=*+h+Aql&ident=*+h+Aql&submit=Aladin+previewer Image 15 Aquilae]

Aquilae, h

177442 and 177463

Category:Aquila (constellation)

093717

Category:K-type giants

Aquilae, 15

7225

BD-04 4684