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{{Starbox begin
| name = HD 187923
}}{{Starbox observe
| epoch = J2000
| constell = Aquila
| ra = {{RA|19|52|03.43853}}[1]
| dec = {{DEC|+11|37|41.9725}}[1]
| appmag_v = 6.148[3]
}}{{Starbox character
| class = G0 V[4]
| b-v = +0.65[5]
| u-b = +0.12[5]
| variable = suspected[7]
}}{{Starbox astrometry
| radial_v = {{val|−20.7|0.2}}[3]
| prop_mo_ra = −344.185[1]
| prop_mo_dec = -334.608[1]
| parallax = 37.0427
| p_error = 0.0529
| parallax_footnote = [1]
| absmag_v = 3.94[3]
}}{{Starbox detail
| source = [13]
| mass = {{Val|1.28|0.17}} or 1.02[14]
| radius = {{Val|1.44|0.04}}
| luminosity = {{Val|2.09|0.10|0.09}}
| temperature = 5,774
| metal_fe = −0.11
| gravity = 4.23
| rotational_velocity = 0.1
| age_gyr = {{Val|8.8|0.7}} or 10.2[14]
}}{{Starbox catalog
| names={{odlist | BD=+11° 4019 | GJ=4126 | HD=187923 | HIP=97767 | HR=7569 | SAO=105348 | LTT=15805 | WDS=J19521+1138A | NSV=12490 }}
}}{{Starbox reference
| Simbad=HD+187923
}}{{Starbox end}}HD 187923 is a suspected variable star[7] in the equatorial constellation of Aquila. It is a dim star that is just visible to the naked eye, having an apparent visual magnitude of 6.148.[3] Based upon an annual parallax shift of {{Val|37.04|ul=mas}},[1] it is located 88 light years away. The star is moving closer to the Earth with a heliocentric radial velocity of −20.7 km/s.[3] It has a relatively high proper motion, traversing the celestial sphere at the rate of {{Val|0.480|ul=arcsecond}} per year.[21]This is an ordinary G-type main-sequence star with a stellar classification of G0 V.[4] It has some similarities to the Sun, and thus is considered a solar analog.[23] Brewer et al. (2016) estimate the star has 1.3 times the mass of the Sun and 1.44 times the Sun's radius. It is thought to be around 9 billion years old and is spinning slowly with a projected rotational velocity of 0.1 km/s. The star is radiating double the Sun's luminosity from its photosphere at an effective temperature of 5,774 K.[13] Casagrande et al. (2011) gave a much lower mass estimate of 1.02 times the Sun's mass with an age of around 10.2 billion years.[14] References1. ^1 2 3 4 5 6 {{cite DR2}}
2. ^1 2 {{citation | last1=Samus | first1=N. N. | last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V. | last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N. | display-authors=1 | title=General Catalogue of Variable Stars | version=GCVS 5.1 | journal=Astronomy Reports | year=2017 | volume=61 | issue=1 | pages=80–88 | bibcode=2017ARep...61...80S | postscript=. }}
3. ^1 2 {{citation | display-authors=1 | last1=Cenarro | first1=A. J. | last2=Cardiel | first2=N. | last3=Vazdekis | first3=A. | last4=Gorgas | first4=J. | title=Mg and TiO spectral features at the near-IR: spectrophotometric index definitions and empirical calibrations | journal=Monthly Notices of the Royal Astronomical Society | volume=396 | issue=4 | pages=1895–1914 | date=July 2009 | doi=10.1111/j.1365-2966.2009.14839.x | postscript=. | bibcode=2009MNRAS.396.1895C | arxiv=0903.4835 }}
4. ^1 2 3 4 5 {{citation | display-authors=1 | last1=Nordström | first1=B. | last2=Mayor | first2=M. | last3=Andersen | first3=J. | last4=Holmberg | first4=J. | last5=Pont | first5=F. | last6=Jørgensen | first6=B. R. | last7=Olsen | first7=E. H. | last8=Udry | first8=S. | last9=Mowlavi | first9=N. | title=The Geneva-Copenhagen survey of the Solar neighbourhood: Ages, metallicities, and kinematic properties of 14,000 F and G dwarfs | journal=Astronomy and Astrophysics | volume=418 | pages=989–1019 | date=May 2004 | arxiv=astro-ph/0405198 | bibcode=2004A&A...418..989N | doi=10.1051/0004-6361:20035959 | postscript=. }}
5. ^1 2 {{citation | last1=Mermilliod | first1=J.-C. | postscript=. | title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) | journal=Catalogue of Eggen's UBV data. SIMBAD | date=1986 | bibcode=1986EgUBV........0M }}
6. ^1 2 {{citation | display-authors=1 | last1=Brewer | first1=John M. | last2=Fischer | first2=Debra A. | last3=Valenti | first3=Jeff A. | last4=Piskunov | first4=Nikolai | title=Spectral Properties of Cool Stars: Extended Abundance Analysis of 1,617 Planet-Search Stars | journal=The Astrophysical Journal Supplement Series | volume=225 | issue=2 | pages=32 | year=2016 | bibcode=2016ApJS..225...32B | arxiv=1606.07929 | doi=10.3847/0067-0049/225/2/32 | postscript=. }}
7. ^1 {{citation | last1=Lépine | first1=Sébastien | last2=Shara | first2=Michael M. | title=A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog) | journal=The Astronomical Journal | volume=129 | issue=3 | pages=1483–1522 | date=March 2005 | doi=10.1086/427854 | bibcode=2005AJ....129.1483L | arxiv=astro-ph/0412070 | postscript=. }}
8. ^1 {{citation | title=Chemical Composition of 15 Photometric Analogues of the Sun | last1=Galeev | first1=A. I. | last2=Bikmaev | first2=I. F. | last3=Musaev | first3=F. A. | last4=Galazutdinov | first4=G. A. | journal=Astronomy Reports | display-authors=1 | postscript=. | volume=48 | issue=6 | pages=492–510 | date=June 2004 | doi=10.1134/1.1767216 | bibcode=2004ARep...48..492G }}
9. ^1 2 3 {{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 | postscript=. | bibcode=2011A&A...530A.138C | arxiv=1103.4651 }}
}}External links{{Stars of Aquila}} 8 : G-type main-sequence stars|Suspected variables|Aquila (constellation)|Durchmusterung objects|Gliese and GJ objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |