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{{Short description|Star in the constellation Telescopium}}
{{Short description|Star in the constellation Telescopium}}
{{Starbox begin}}
{{Starbox begin}}
<!--
{{Starbox image
⚫
| image =
| caption =
| credit =
⚫
}}
-->
{{Starbox observe
{{Starbox observe
| epoch = J2000
| epoch = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
| equinox = <!--Equinox of coordinates (defaults to epoch)-->
| constell = [[Telescopium]]
| constell = [[Telescopium]]
| ra = {{RA|18|49|27.3433}}<ref name = EDR3/>
| pronounce = <!--Pronunciation guide-->
| ra = {{RA|18|49|27.34329}}<ref name=aaa474_2_653/>
| dec = {{DEC|–45|48|36.3601}}<ref name = EDR3/>
| dec = {{DEC|–45|48|36.3665}}<ref name=aaa474_2_653/>
| appmag_v = 5.80 ± 0.01<ref name = Tycho2000/>
| appmag_v = 5.802
}}
}}
{{Starbox character
{{Starbox character
| type = [[Horizontal branch]]<ref name = Jones2011/>
| type = Giant
| class = G8&nbsp;III<ref name=houk1978/>
| class = G8 III<ref name = Houk1978/>
⚫
| b-v = +0.9<ref name = Johnson1966/>
| appmag_1_passband = <!-- Passband for first apparent magnitude (e.g., H, J, K, etc.) -->
| appmag_1 = <!-- Value of first apparent magnitude -->
| appmag_2_passband = <!-- Passband for second apparent magnitude (e.g., H, J, K, etc.) -->
| appmag_2 = <!-- Value of second apparent magnitude -->
| appmag_3_passband = <!-- Passband for third apparent magnitude (e.g., H, J, K, etc.) -->
| appmag_3 = <!-- Value of third apparent magnitude -->
| appmag_4_passband = <!-- Passband for fourth apparent magnitude (e.g., H, J, K, etc.) -->
| appmag_4 = <!-- Value of fourth apparent magnitude -->
| appmag_5_passband = <!-- Passband for fifth apparent magnitude (e.g., H, J, K, etc.) -->
| appmag_5 = <!-- Value of fifth apparent magnitude -->
| appmag_6_passband = <!-- Passband for sixth apparent magnitude (e.g., H, J, K, etc.) -->
| appmag_6 = <!-- Value of sixth apparent magnitude -->
| appmag_7_passband = <!-- Passband for seventh apparent magnitude (e.g., H, J, K, etc.) -->
| appmag_7 = <!-- Value of seventh apparent magnitude -->
| appmag_8_passband = <!-- Passband for eighth apparent magnitude (e.g., H, J, K, etc.) -->
| appmag_8 = <!-- Value of eighth apparent magnitude -->
| r-i = <!--R-I color-->
| v-r = <!--V-R color-->
| b-v = <!--B-V color-->
| u-b = <!--U-B color-->
| j-h = <!--J-H color-->
| j-k = <!--J-K color-->
| variable = <!--Variability type-->
}}
}}
{{Starbox astrometry
{{Starbox astrometry
| radial_v = 9.7<ref name=rgcrv/>
| radial_v = 9.7 ± 2.9<ref name = Gontcharov2006/>
| prop_mo_ra = 73.85<ref name=aaa474_2_653/>
| prop_mo_ra = +74.263<ref name = EDR3/>
| prop_mo_dec = 56.57<ref name=aaa474_2_653/>
| prop_mo_dec = +57.015<ref name = EDR3/>
| parallax = 9.10
| parallax = 8.9671
| p_error = 0.31
| p_error = 0.0429
| parallax_footnote = <ref name=aaa474_2_653/>
| parallax_footnote = <ref name = EDR3/>
| absmag_v = 0.201
| absmag_v = +0.6<ref name = Anderson2012/>
}}
}}
{{Starbox detail
{{Starbox detail
| source = <!--[source url]-->
| source = <ref name = Jones2011/>
| mass = 1<ref name=wolfram/>
| mass = 1.87
| radius = 10.74
| mass_mj = <!--Mass (in Jupiter masses)-->
| gravity = 2.68
⚫
| radius = 3.0<ref name=aaa367_521/>
| luminosity = 67
| radius_rj = <!--Radius (in Jupiter radii)-->
⚫
| temperature = 5,040
| gravity = <!--Surface gravity (given as the base 10 logarithm expressed in cgs units)-->
| metal_fe = −0.43 ± 0.16
| luminosity = <!--Luminosity (in solar luminosities); prefer luminosity_bolometric or luminosity_visual-->
| rotational_velocity = 3.11
| luminosity_bolometric = <!--Luminosity (in solar luminosities), bolometric-->
⚫
| age_gyr =
| luminosity_visual = <!--Luminosity (in solar luminosities), visual (V)-->
⚫
| temperature = 5,200<ref name=wolfram/>
| metal = <!--Metallicity (no units provided by template)-->
| metal_fe = <!--Metallicity ([Fe/H] dex) -->
| rotation = <!--Rotation (no units provided by template)-->
| rotational_velocity = <!--Rotational velocity (v sin i, in km/s)-->
| age = <!--Age (in years)-->
| age_gyr = <!--Age (in billions of years)-->
}}
}}
{{Starbox catalog
{{Starbox catalog
| names=30 G. Telescopium,<ref name=gould/> [[Henry Draper catalogue|HD]]&nbsp;173791, {{nowrap|[[Cape Photographic Durchmusterung|CPD]]−45 9479}}, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;229306, [[Fifth Fundamental Catalogue|FK5]]&nbsp;3495, [[Hipparcos catalogue|HIP]]&nbsp;92367.<ref name=SIMBAD/> }}
| names= {{odlist|Gould = 30 G. Telescopii<ref name=gould/>|HD = 173791|CPD = −45 9479|SAO = 229306|FK5 = 3495|HIP = 92367}}<ref name=SIMBAD/>
⚫
}}
{{Starbox reference
{{Starbox reference
| Simbad = HD+173791
| Simbad = HD+173791
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{{starbox end}}
{{starbox end}}


'''HD 173791''' (30 G. Telescopium), also known as '''HR 7065''', is a [[giant star]] in the [[constellation]] [[Telescopium]], located about {{Convert|358|ly|pc|abbr=off|lk=on}} from Earth. It has an [[apparent magnitude]] of +5.8, allowing it to be viewed with the naked eye under suitable viewing conditions. The [[stellar classification]] is G8III, which indicates that it has evolved from a [[main sequence]] star and has expanded into a giant with three times the [[solar radius|Sun's radius]].<ref name=aaa367_521/> The [[effective temperature]] of its [[chromosphere]] is 5,200&nbsp;K,<ref name=wolfram/> giving it the characteristic yellow hue of a G-type star.<ref name=csiro/>
'''HD 173791''' ('''HR 7065''') is a solitary<ref name = Eggelton2008/> [[star]] located in the [[constellation]] [[Telescopium]]. It has an [[apparent magnitude]] of 5.80,<ref name = Tycho2000/> allowing it to be viewed with the naked eye under suitable viewing conditions. Located about 364 [[light years]] away,<ref name = EDR3/> the star is receding from the [[Solar System]] with a heliocentric [[radial velocity]] of {{val|9.7|ul=km/s}}.<ref name = Gontcharov2006/>


This is an ageing [[G-type star]] that is currently on the [[horizontal branch]].<ref name = Jones2011/> At present it has 1.87 times the [[mass of the Sun]] but has expanded to 10.74 times its girth.<ref name = Jones2011/> It radiates at {{val|67|ul=solar luminosity}} from its enlarged photosphere at an [[effective temperature]] of 5,040 [[Kelvin|K]],<ref name = Jones2011/> giving it a yellow glow. HD 173791 is metal deficient–with a metallicity only 37% that of the [[Sun]];<ref name = Jones2011/> it spins modestly with a [[projected rotational velocity]] of {{val|3.11|ul=km/s}}.<ref name = Jones2011/>
It has an estimated lifespan of 10 billion years and has about the same mass as the Sun. After passing through the giant stage, its end state will probably be a carbon-oxygen [[white dwarf]].<ref name=wolfram/>


==References==
==References==
{{Reflist|2|refs=
{{Reflist||refs=


<ref name = EDR3>{{Cite Gaia EDR3|6711579440222617728}}</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 |arxiv = 0708.1752 | s2cid=18759600 }}</ref>


<ref name = Tycho2000>{{cite journal |last1=Høg |first1=E. |last2=Fabricius |first2=C. |last3=Makarov |first3=V. V. |last4=Urban |first4=S. |last5=Corbin |first5=T. |last6=Wycoff |first6=G. |last7=Bastian |first7=U. |last8=Schwekendiek |first8=P. |last9=Wicenec |first9=A. |title=The Tycho-2 catalogue of the 2.5 million brightest stars |journal=Astronomy and Astrophysics |date=March 2000 |volume=355 |pages=L27–L30 |issn=0004-6361 |bibcode=2000A&A...355L..27H}}</ref>
<ref name=rgcrv>{{citation | last=Evans | first=D. S. | date=June 20–24, 1966 |editor1=Batten, Alan Henry |editor2=Heard, John Frederick | contribution=The Revision of the General Catalogue of Radial Velocities | title=Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 | location=University of Toronto | publisher=[[International Astronomical Union]] | bibcode=1967IAUS...30...57E | volume=30 | pages=57 }}</ref>


⚫
<ref name = Houk1978>{{cite book |last1=Houk |first1=Nancy |title=Michigan catalogue of two-dimensional spectral types for the HD stars |date=1978 |bibcode=1978mcts.book.....H }}</ref>
<ref name=aaa367_521>{{citation | display-authors=1 | last1=Pasinetti Fracassini | first1=L. E. | last2=Pastori | first2=L. | last3=Covino | first3=S. | last4=Pozzi | first4=A. | title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics | journal=Astronomy and Astrophysics | volume=367 | pages=521–524 |date=February 2001 | doi=10.1051/0004-6361:20000451 | bibcode=2001A&A...367..521P | arxiv = astro-ph/0012289 | issue=2 | s2cid=425754 }} ''Note:'' see VizieR catalogue [http://cdsarc.u-strasbg.fr/cgi-bin/qcat?J/A+A/367/521 J/A+A/367/521].</ref>

⚫
<ref name=houk1978>{{citation | last1=Houk | first1=Nancy | title=Michigan catalogue of two-dimensional spectral types for the HD stars | year=1978 | bibcode=1978mcts.book.....H | journal=Ann Arbor : Dept. Of Astronomy }}</ref>


<ref name=SIMBAD>{{citation | title=HR 7065 -- Star | work=SIMBAD | publisher=[[Centre de Données astronomiques de Strasbourg]] | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%403528329 | access-date=2011-12-19 }}</ref>
<ref name=SIMBAD>{{citation | title=HR 7065 -- Star | work=SIMBAD | publisher=[[Centre de Données astronomiques de Strasbourg]] | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%403528329 | access-date=2011-12-19 }}</ref>

<ref name=wolfram>{{citation|url=http://www.wolframalpha.com/entities/stars/hip_92367/3j/2a/yb/ |title=Wolfram&#124;Alpha: HIP 92367 |publisher=[[WolframAlpha]] |date=October 26, 2011 |access-date=2011-12-16 |url-status=dead |archive-url=https://archive.today/20120110061239/http://www.wolframalpha.com/entities/stars/hip_92367/3j/2a/yb/ |archive-date=January 10, 2012 }}</ref>


<ref name=gould>{{citation|last=Gould |first=B. A. |title=Uranometria Argentina |publisher=Reprinted and updated by Pilcher, F |url=http://www.uranometriaargentina.com/ |access-date=2012-01-06 |url-status=dead |archive-url=https://web.archive.org/web/20120227032716/http://www.uranometriaargentina.com/ |archive-date=2012-02-27 }}</ref>
<ref name=gould>{{citation|last=Gould |first=B. A. |title=Uranometria Argentina |publisher=Reprinted and updated by Pilcher, F |url=http://www.uranometriaargentina.com/ |access-date=2012-01-06 |url-status=dead |archive-url=https://web.archive.org/web/20120227032716/http://www.uranometriaargentina.com/ |archive-date=2012-02-27 }}</ref>


<ref name = Gontcharov2006>{{cite journal |last1=Gontcharov |first1=G. A. |title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system |journal=Astronomy Letters |date=November 2006 |volume=32 |issue=11 |pages=759–771 |doi=10.1134/S1063773706110065 |issn=1063-7737 |bibcode=2006AstL...32..759G |arxiv=1606.08053|s2cid=119231169 }}</ref>
<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=2012-01-16 |url-status=dead |archive-url=https://www.webcitation.org/6630AbtJZ?url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |archive-date=March 10, 2012 }}</ref>

<ref name = Jones2011>{{cite journal |last1=Jones |first1=M. I. |last2=Jenkins |first2=J. S. |last3=Rojo |first3=P. |last4=Melo |first4=C. H. F. |title=Study of the impact of the post-MS evolution of the host star on the orbits of close-in planets: I. Sample definition and physical properties⋆⋆⋆ |journal=Astronomy & Astrophysics |date=December 2011 |volume=536 |pages=A71 |doi=10.1051/0004-6361/201117887 |issn=0004-6361 |bibcode=2011A&A...536A..71J |arxiv=1110.6459 |doi-access=free}}</ref>

<ref name = Johnson1966>{{cite journal |last1=Johnson |first1=H. L. |last2=Mitchell |first2=R. I. |last3=Iriarte |first3=B. |last4=Wisniewski |first4=W. Z. |title=UBVRIJKL Photometry of the Bright Stars |journal=Communications of the Lunar and Planetary Laboratory |date=1 January 1966 |volume=4 |pages=99–110 |bibcode=1966CoLPL...4...99J}}</ref>

<ref name = Anderson2012>{{cite journal |last1=Anderson |first1=E. |last2=Francis |first2=Ch. |title=XHIP: An extended hipparcos compilation |journal=Astronomy Letters |date=May 2012 |volume=38 |issue=5 |pages=331–346 |doi=10.1134/S1063773712050015 |language=en |issn=1063-7737 |bibcode=2012AstL...38..331A |arxiv=1108.4971}}</ref>

<ref name = Eggelton2008>{{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 | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 |doi-access=free}}</ref>


}}
}}

Revision as of 00:53, 27 March 2022

HD 173791
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 18h 49m 27.3433s[1]
Declination –45° 48′ 36.3601″[1]
Apparent magnitude (V) 5.80 ± 0.01[2]
Characteristics
Evolutionary stage Horizontal branch[3]
Spectral type G8 III[4]
B−V color index +0.9[5]
Astrometry
Radial velocity (Rv)9.7 ± 2.9[6] km/s
Proper motion (μ) RA: +74.263[1] mas/yr
Dec.: +57.015[1] mas/yr
Parallax (π)8.9671 ± 0.0429 mas[1]
Distance364 ± 2 ly
(111.5 ± 0.5 pc)
Absolute magnitude (MV)+0.6[7]
Details[3]
Mass1.87 M☉
Radius10.74 R☉
Luminosity67 L☉
Surface gravity (log g)2.68 cgs
Temperature5,040 K
Metallicity [Fe/H]−0.43 ± 0.16 dex
Rotational velocity (v sin i)3.11 km/s
Other designations
30 G. Telescopii[8], CPD−45 9479, FK5 3495, HD 173791, HIP 92367, SAO 229306[9]
Database references
SIMBADdata

HD 173791 (HR 7065) is a solitary[10] star located in the constellation Telescopium. It has an apparent magnitude of 5.80,[2] allowing it to be viewed with the naked eye under suitable viewing conditions. Located about 364 light years away,[1] the star is receding from the Solar System with a heliocentric radial velocity of 9.7 km/s.[6]

This is an ageing G-type star that is currently on the horizontal branch.[3] At present it has 1.87 times the mass of the Sun but has expanded to 10.74 times its girth.[3] It radiates at 67 L☉ from its enlarged photosphere at an effective temperature of 5,040 K,[3] giving it a yellow glow. HD 173791 is metal deficient–with a metallicity only 37% that of the Sun;[3] it spins modestly with a projected rotational velocity of 3.11 km/s.[3]

References

  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. ^ a b c d e f g Jones, M. I.; Jenkins, J. S.; Rojo, P.; Melo, C. H. F. (December 2011). "Study of the impact of the post-MS evolution of the host star on the orbits of close-in planets: I. Sample definition and physical properties⋆⋆⋆". Astronomy & Astrophysics. 536: A71. arXiv:1110.6459. Bibcode:2011A&A...536A..71J. doi:10.1051/0004-6361/201117887. ISSN 0004-6361.
  4. ^ Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Bibcode:1978mcts.book.....H.
  5. ^ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1 January 1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  6. ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737. S2CID 119231169.
  7. ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737.
  8. ^ Gould, B. A., Uranometria Argentina, Reprinted and updated by Pilcher, F, archived from the original on 2012-02-27, retrieved 2012-01-06
  9. ^ "HR 7065 -- Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2011-12-19
  10. ^ 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
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