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{{Short description|Star in the constellation Aquila}} |
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{{Starbox catalog |
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| names = [[Bonner Durchmusterung|BD]]–04 4684, [[Henry Draper Catalogue|HD]] 177463, [[Hipparcos catalogue|HIP]] |
| names = [[Bayer designation|h]] Aquilae, [[Bonner Durchmusterung|BD]]–04° 4684, [[Henry Draper Catalogue|HD]] 177463, [[Hipparcos catalogue|HIP]] 93717, [[Bright Star Catalogue|HR]] 7225, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 142996.<ref name=SIMBAD/> |
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| Simbad=15+Aql |
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'''15 Aquilae''' (abbreviated '''15 Aql''') is a |
'''15 Aquilae''' (abbreviated '''15 Aql''') is a star in the [[celestial equator|equatorial]] [[constellation]] of [[Aquila (constellation)|Aquila]]. ''15 Aquilae'' is the [[Flamsteed designation]]; it also bears the [[Bayer designation]] '''h Aquilae'''. The [[apparent visual magnitude]] is 5.41,<ref name=mnassa23_175/> so it is faintly visible to the naked eye. An [[optical companion]], HD 177442, is 39 arc seconds away from it<ref name=mnras389_2_869/> The distance to 15 Aquilae can be estimated from its annual [[parallax]] shift of 11.27 [[milliarcsecond|mas]],<ref name=aaa474_2_653/> yielding a range of approximately {{Convert|289|ly|pc|abbr=off|lk=on}} from Earth with a 9 light-year [[margin of error]]. |
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With a [[stellar classification]] of K1 III,<ref name=aaa508_3_1313/> the [[spectrum]] of 15 Aquilae matches a [[giant star]] with an |
With a [[stellar classification]] of K1 III,<ref name=aaa508_3_1313/> the [[stellar spectrum|spectrum]] of 15 Aquilae matches a [[giant star]] with an age of roughly four billion years.<ref name=aaa480_1_91/> At this stage of its [[stellar evolution|evolution]], the [[stellar atmosphere|outer atmosphere]] of the star has expanded to 14<ref name=aj135_1_209/> times the radius of the Sun. It is radiating 83<ref name=aj135_1_209/> times the Sun's luminosity into space at an [[effective temperature]] of 4,560 K.<ref name=aaa508_3_1313/> This heat gives it the orange-hued glow of a [[K-type star]].<ref name=csiro/> |
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This star is most likely a member of the [[thin disk population]] of the [[Milky Way]]. It is orbiting through the galaxy with an [[orbital eccentricity|eccentricity]] of 0.06, which carries it as close as {{Convert|24.30|kly|kpc|abbr=on|lk=on}} to the [[Galactic |
This star is most likely a member of the [[thin disk population]] of the [[Milky Way]]. It is orbiting through the galaxy with an [[orbital eccentricity|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]].<ref name=aaa480_1_91/> |
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==References== |
==References== |
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{{reflist|refs= |
{{reflist|refs= |
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<ref name=aaa474_2_653>{{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 }}</ref> |
<ref name=aaa474_2_653>{{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 }}</ref> |
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<ref name=mnras389_2_869>{{ |
<ref name=mnras389_2_869>{{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=. }}</ref> |
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<ref name=aaa508_3_1313>{{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 |
<ref name=aaa508_3_1313>{{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 }}</ref> |
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<ref name=aj135_1_209>{{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 |
<ref name=aj135_1_209>{{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 }}</ref> |
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<ref name=mnassa23_175>{{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=. }}</ref> |
<ref name=mnassa23_175>{{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=. }}</ref> |
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<ref name=aaa480_1_91>{{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 }}</ref> |
<ref name=aaa480_1_91>{{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 }}</ref> |
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<ref name=SIMBAD>{{ |
<ref name=SIMBAD>{{cite simbad | title=15 Aql | access-date=2012-07-22 | postscript=. | mode=cs2 }}</ref> |
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<ref name=csiro>{{citation |
<ref name=csiro>{{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 }}</ref> |
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{{Stars of Aquila}} |
{{Stars of Aquila}} |
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{{DEFAULTSORT:15 Aquilae}} |
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[[Category:Bayer objects|Aquilae, h]] |
[[Category:Bayer objects|Aquilae, h]] |
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[[Category:Henry Draper Catalogue objects|177442 and 177463]] |
[[Category:Henry Draper Catalogue objects|177442 and 177463]] |
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[[Category:Hipparcos objects|093717]] |
[[Category:Hipparcos objects|093717]] |
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[[Category:K-type giants]] |
[[Category:K-type giants]] |
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[[Category:Flamsteed objects|Aquilae, 15]] |
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[[Category:Bright Star Catalogue objects|7225]] |
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[[Category:Durchmusterung objects|BD-04 4684]] |
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Latest revision as of 11:11, 22 August 2024
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 04m 57.67233s[1] |
| Declination | –04° 01′ 53.1059″[1] |
| Apparent magnitude (V) | 5.41[2] |
| Characteristics | |
| Spectral type | K1 III[3] |
| U−B color index | +1.01[2] |
| B−V color index | +1.12[2] |
| Astrometry | |
| Radial velocity (Rv) | –23.17 ± 0.61[4] km/s |
| Proper motion (μ) | RA: +21.90[1] mas/yr Dec.: -26.05[1] mas/yr |
| Parallax (π) | 11.27 ± 0.36 mas[1] |
| Distance | 289 ± 9 ly (89 ± 3 pc) |
| Absolute magnitude (MV) | 0.414[5] |
| Details | |
| Radius | 14[4] R☉ |
| Luminosity | 83[4] L☉ |
| Surface gravity (log g) | 2.65[3] cgs |
| Temperature | 4,560[3] K |
| Metallicity [Fe/H] | –0.25[3] dex |
| Rotational velocity (v sin i) | 3.4[4] km/s |
| Age | 4.09 ± 2.07[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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,[2] so it is faintly visible to the naked eye. An optical companion, HD 177442, is 39 arc seconds away from it[7] The distance to 15 Aquilae can be estimated from its annual parallax shift of 11.27 mas,[1] yielding a range of approximately 289 light-years (89 parsecs) from Earth with a 9 light-year margin of error.
With a stellar classification of K1 III,[3] the spectrum of 15 Aquilae matches a giant star with an age of roughly four billion years.[5] At this stage of its evolution, the outer atmosphere of the star has expanded to 14[4] times the radius of the Sun. It is radiating 83[4] times the Sun's luminosity into space at an effective temperature of 4,560 K.[3] This heat gives it the orange-hued glow of a K-type star.[8]
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 24.30 kly (7.45 kpc) to the Galactic Center, and as far away as 27.60 kly (8.46 kpc). The orbital inclination carries it no more than 196 ly (60 pc) from the galactic plane.[5]
References
[edit]- ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d Cousins, A. W. J. (1964), "Photometric Data for Stars in the Equatorial Zone (Seventh List)", Monthly Notes of the Astronomical Society of Southern Africa, 23: 175, Bibcode:1964MNSSA..23..175C.
- ^ a b c d e f Frasca, A.; et al. (December 2009), "REM near-IR and optical photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters", Astronomy and Astrophysics, 508 (3): 1313–1330, arXiv:0911.0760, Bibcode:2009A&A...508.1313F, doi:10.1051/0004-6361/200913327, S2CID 118361131.
- ^ a b c d e f Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397.
- ^ a b c d Soubiran, C.; et al. (2008), "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants", Astronomy and Astrophysics, 480 (1): 91–101, arXiv:0712.1370, Bibcode:2008A&A...480...91S, doi:10.1051/0004-6361:20078788, S2CID 16602121.
- ^ "15 Aql", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2012-07-22.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on February 22, 2012, retrieved 2012-07-21.
