| absmag_v = +0.46[12]
}}{{Starbox detail
| mass =
| radius =
| luminosity = 54.20[12]
| temperature = 7,250[3]
| metal_fe = –0.16[3]
| gravity = 3.41[16]
| rotational_velocity = 57[17]
| age_gyr =
}}{{Starbox catalog
| names = {{odlist | V=V1208 Aql | F=28 Aql | BD=+12° 3879 | HD=181333 | HIP=94982 | HR=7331 | SAO=104722 }}[18]
}}{{Starbox reference
|Simbad=28+Aql
}}{{Starbox end}}28 Aquilae, abbreviated 28 Aql, is a star in the equatorial constellation of Aquila. 28 Aquilae is its Flamsteed designation though it also bears the Bayer designation A Aquilae. It has an apparent visual magnitude is 5.5,[3] making this a faint star that requires dark suburban skies to view (according to the Bortle Dark-Sky Scale). The annual parallax shift of 9.67 mas[1] means this star is located at a distance of approximately {{Convert|340|ly|pc|abbr=off|lk=on}} from Earth.
The spectrum of this star matches a stellar classification of F0 III,[3] with the luminosity class of III indicating this is most likely an evolved giant star. The variability of this star was discovered by Michel Breger in 1969. It was revealed to be a Delta Scuti-type pulsating variable star with at least two periods of pulsation. The known periods have frequencies of 6.68 and 7.12 cycles per day.[7] The outer atmosphere has an effective temperature of 7,250 K,[3] which lies in the range of a yellow-white hued F-type star.[24]
References
1. ^1 2 {{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | postscript=. }}
2. ^1 2 3 4 5 {{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 }}
3. ^1 2 3 4 5 6 7 8 {{citation | last1=Luck | first1=R. Earle | last2=Heiter | first2=Ulrike | title=Giants in the Local Region | journal=The Astronomical Journal | volume=133 | issue=6 | pages=2464–2486 | doi=10.1086/513194 | bibcode=2007AJ....133.2464L | postscript=. |date=June 2007}}
4. ^1 {{citation | display-authors=1 | last1=Royer | first1=F. | last2=Grenier | first2=S. | last3=Baylac | first3=M.-O. | last4=Gómez | first4=A. E. | last5=Zorec | first5=J. | title=Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i | journal=Astronomy and Astrophysics | volume=393 | pages=897–911 | doi=10.1051/0004-6361:20020943 | bibcode=2002A&A...393..897R | arxiv=astro-ph/0205255 | postscript=. |date=October 2002}}
5. ^1 2 {{citation | last1=Breger | first1=M. | title=UBV and narrow-band UVBY photometry of bright stars | journal=Astronomical Journal | volume=73 | pages=84–85 | doi=10.1086/110602 | bibcode=1968AJ.....73...84B | postscript=. |date=March 1968}}
6. ^1 {{citation | display-authors=1 | last1=Soubiran | first1=C. | last2=Le Campion | first2=J.-F. | last3=Cayrel de Strobel | first3=G. | last4=Caillo | first4=A. | title=The PASTEL catalogue of stellar parameters | journal=Astronomy and Astrophysics | volume=515 | page=A111 | doi=10.1051/0004-6361/201014247 | bibcode=2010A&A...515A.111S | postscript=. |arxiv = 1004.1069 |date=June 2010}}
7. ^1 {{cite simbad | title=* 28 Aql | accessdate=2012-07-22 | postscript=. }}
8. ^1 2 {{citation | last1=Dall | first1=T. H. | last2=Frandsen | first2=S. | title=Mode characterisation in delta Scuti stars. I. rho Pup, GN And, V1208 Aql and AV Cet | journal=Astronomy and Astrophysics | volume=386 | pages=964–970 | doi=10.1051/0004-6361:20020357 | bibcode=2002A&A...386..964D | postscript=. |date=May 2002}}
9. ^1 {{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 |accessdate=2012-01-16 |postscript=. |deadurl=yes |archiveurl=https://www.webcitation.org/6630AbtJZ?url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |archivedate=March 10, 2012 }}