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{{Starbox begin
{{Starbox begin
| name = [[Henry Draper Catalogue|HD]] 195034}}
| name = [[Henry Draper Catalogue|HD]] 195034
}}
{{Starbox observe
{{Starbox observe
| epoch = [[J2000.0]]
| epoch = [[J2000.0]]
| equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
| equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
| constell = [[Vulpecula (constellation)|Vulpecula]]
| constell = [[Vulpecula (constellation)|Vulpecula]]
| ra = {{RA|20|28|11.81471}}<ref name=aaa474_2_653/>
⚫
| ra = {{RA|20|28|11.8149}}<ref name=sb0>{{SIMBAD link|HD+195034|LTT 15980 -- High proper-motion Star}}, database entry, [[SIMBAD]]. Accessed on line February 8, 2011.</ref>
| dec = {{DEC|+22|07|44.375}}<ref name=sb0 />
| dec = {{DEC|+22|07|44.3723}}<ref name=aaa474_2_653/>
| appmag_v=7.088<ref name=sb0 />
| appmag_v=+7.088<ref name=sb0 />
}}
}}
{{Starbox character
{{Starbox character
| class = G5<ref name=sb0 />
| class = G5<ref name=aj133_6_2524/>
| b-v = 0.6<ref name=sb0 />
| b-v = +0.6<ref name=sb0 />
| v-r = 0.4<ref name=sb0 />
| v-r = +0.4<ref name=sb0 />
| r-i = 0.3<ref name=sb0 />
| r-i = +0.3<ref name=sb0 />
}}
}}
{{Starbox astrometry
{{Starbox astrometry
| radial_v = −1.6&nbsp;±&nbsp;0.2<ref name=sb0 />
| radial_v = −1.6<ref name=geneva1/>
| prop_mo_ra = −23.55<ref name=sb0 />
| prop_mo_ra = −23.90<ref name=aaa474_2_653/>
| prop_mo_dec = −243.67<ref name=sb0 />
| prop_mo_dec = −243.96<ref name=aaa474_2_653/>
| parallax = 35.41
| parallax = 35.42
| p_error = 0.80
| p_error = 0.59
| parallax_footnote = <ref name=sb0 />
| parallax_footnote = <ref name=aaa474_2_653/>
| absmag_v=
| absmag_v= 4.83<ref>From apparent magnitude and parallax.</ref>
}}
}}
{{Starbox detail
{{Starbox detail
| rotational_velocity = 2.39<ref name=aaa515_A93/>
| rotational_velocity = 3<ref name=geneva1>[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/117A/newcat.dat&recno=14158 HD 195034], database entry, The Geneva-Copenhagen Survey of Solar neighbourhood, J. Holmberg et al., 2007, [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?V/117A V/117A]. Accessed on line February 8, 2011.</ref>
| mass = 0.90&nbsp;(0.85&nbsp;to&nbsp;0.97)<ref name=geneva1 />
| mass = {{nowrap|0.90 (0.85 to 0.97)}}<ref name=geneva1 />
| age = 7.6&nbsp;(3.0&nbsp;to&nbsp;11.6)&nbsp;×&nbsp;10<sup>9</sup><ref name=geneva1 />
| age_gyr = {{nowrap|7.6 (3.0 to 11.6)}}<ref name=geneva1 />
| temperature = 5700<ref name=geneva1 />
| temperature = 5,700<ref name=geneva1 />
| metal = [Fe/H]&nbsp;=&nbsp;−0.17<ref name=geneva1 />
| metal_fe = −0.17<ref name=geneva1 />
}}
}}
{{Starbox catalog
{{Starbox catalog
| names=[[Durchmusterung|BD]]+21&nbsp;4221, [[Hipparcos Catalogue|HIP]]&nbsp;100963, [[Luyten Two-Tenths catalogue|LTT]]&nbsp;15980, [[New Luyten Two-Tenths catalogue|NLTT]]&nbsp;49310, [[PPM Star Catalogue|PPM]]&nbsp;111203, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;88711.<ref name=sb0 />}}
| names = [[Durchmusterung|BD]]+21&nbsp;4221, [[Hipparcos Catalogue|HIP]]&nbsp;100963, [[Luyten Two-Tenths catalogue|LTT]]&nbsp;15980, [[New Luyten Two-Tenths catalogue|NLTT]]&nbsp;49310, [[PPM Star Catalogue|PPM]]&nbsp;111203, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;88711.<ref name=sb0 />
}}
{{Starbox reference
{{Starbox reference
| Simbad=HD+195034}}
| Simbad=HD+195034
}}
{{Starbox end}}
{{Starbox end}}


'''HD&nbsp;195034''' is a [[G-type star|G-type]] [[star]] in the [[constellation]] of [[Vulpecula (constellation)|Vulpecula]].<ref name=sb0 /> It has an [[apparent visual magnitude]] of approximately 7.088.<ref name=sb0 /> It has similar mass, metallicity and temperature to the [[Sun]] and was called a [[solar twin]] in a 2009 study, although its [[lithium]] abundance is three to four times that of the Sun.<ref name=aaa501_2>{{cite journal | author=Do Nascimento, J. D., Jr.; Castro, M.; Meléndez, J.; Bazot, M.; Théado, S.; Porto de Mello, G. F.; de Medeiros, J. R. | title=Age and mass of solar twins constrained by lithium abundance | journal=Astronomy and Astrophysics | volume=501 | issue=2 | year=2009 | pages=687–694 | month=July | doi=10.1051/0004-6361/200911935 | bibcode=2009A&A...501..687D }}</ref>
'''HD&nbsp;195034''' is a [[star]] in the faint northern [[constellation]] of [[Vulpecula (constellation)|Vulpecula]].<ref name=sb0 /> It has an [[apparent visual magnitude]] of approximately 7.1,<ref name=sb0 /> making it generally too faint to be seen with the naked eye [[Bortle Dark-Sky Scale|in most circumstances]]. The distance to this star, as determined using [[parallax]] measurements from the [[Hipparcos]] mission, is around {{Convert|92|ly|pc|abbr=off|lk=on}}.<ref name=aaa474_2_653/>

This star has a [[stellar classification]] of G5,<ref name=sb0 /> making it a [[G-type star]] with an undetermined [[luminosity class]]. It has similar mass, temperature and chemical abundance to the [[Sun]] and was called a [[solar twin]] in a 2009 study, although its [[lithium]] abundance is three to four times that of the Sun.<ref name=aaa501_2/>


==References==
==References==
{{reflist}}
{{reflist|refs=

<ref name=aaa474_2_653>{{citation | last1=van Leeuwen | first1=F. | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | month=November | year=2007 | pages=653–664 | doi=10.1051/0004-6361:20078357 | bibcode=2007A&A...474..653V | arXiv=0708.1752 }}</ref>

⚫
<ref name=sb0>{{SIMBAD link|HD+195034|LTT 15980 -- High proper-motion Star}}, database entry, [[SIMBAD]]. Accessed on line February 8, 2011.</ref>

<ref name=aj133_6_2524>{{citation | last1=White | first1=Russel J. | last2=Gabor | first2=Jared M. | last3=Hillenbrand | first3=Lynne A. | title=High-Dispersion Optical Spectra of Nearby Stars Younger Than the Sun | journal=The Astronomical Journal | volume=133 | issue=6 | pages=2524–2536 | month=June | year=2007 | doi=10.1086/514336 | bibcode=2007AJ....133.2524W }}</ref>

<ref name=geneva1>{{Cite journal | 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 | month=May | year=2004 | doi=10.1051/0004-6361:20035959 | bibcode=2004A&A...418..989N| issue=3 | arxiv=astro-ph/0405198 }}. See the [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/117A/newcat.dat&recno=14158 Vizier entry] for this star.</ref>

<ref name=aaa501_2>{{cite journal | display-authors=1 | last1=Do Nascimento | first1=J. D., Jr. | last2=Castro | first2=M. | last3=Meléndez | first3=J. | last4=Bazot | first4=M. | last5=Théado | first5=S. | last6=Porto de Mello | first6=G. F. | last7=de Medeiros | first7=J. R. | title=Age and mass of solar twins constrained by lithium abundance | journal=Astronomy and Astrophysics | volume=501 | issue=2 | year=2009 | pages=687–694 | month=July | doi=10.1051/0004-6361/200911935 | bibcode=2009A&A...501..687D }}</ref>

<ref name=aaa515_A93>{{citation | display-authors=1 | last1=Takeda | first1=Y. | last2=Honda | first2=S. | last3=Kawanomoto | first3=S. | last4=Ando | first4=H. | last5=Sakurai | first5=T. | title=Behavior of Li abundances in solar-analog stars. II. Evidence of the connection with rotation and stellar activity | journal=Astronomy and Astrophysics | volume=515 | page=A93 | month=June | year=2010 | doi=10.1051/0004-6361/200913897 | bibcode=2010A&A...515A..93T }}</ref>

}}


[[Category:Vulpecula constellation]]
[[Category:Vulpecula constellation]]

Revision as of 16:21, 25 February 2012

HD 195034
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Vulpecula
Right ascension 20h 28m 11.81471s[1]
Declination +22° 07′ 44.3723″[1]
Apparent magnitude (V) +7.088[2]
Characteristics
Spectral type G5[3]
B−V color index +0.6[2]
V−R color index +0.4[2]
R−I color index +0.3[2]
Astrometry
Radial velocity (Rv)−1.6[4] km/s
Proper motion (μ) RA: −23.90[1] mas/yr
Dec.: −243.96[1] mas/yr
Parallax (π)35.42 ± 0.59 mas[1]
Distance92 ± 2 ly
(28.2 ± 0.5 pc)
Details
Mass0.90 (0.85 to 0.97)[4] M☉
Temperature5,700[4] K
Metallicity [Fe/H]−0.17[4] dex
Rotational velocity (v sin i)2.39[5] km/s
Age7.6 (3.0 to 11.6)[4] Gyr
Other designations
BD+21 4221, HIP 100963, LTT 15980, NLTT 49310, PPM 111203, SAO 88711.[2]
Database references
SIMBADdata

HD 195034 is a star in the faint northern constellation of Vulpecula.[2] It has an apparent visual magnitude of approximately 7.1,[2] making it generally too faint to be seen with the naked eye in most circumstances. The distance to this star, as determined using parallax measurements from the Hipparcos mission, is around 92 light-years (28 parsecs).[1]

This star has a stellar classification of G5,[2] making it a G-type star with an undetermined luminosity class. It has similar mass, temperature and chemical abundance to the Sun and was called a solar twin in a 2009 study, although its lithium abundance is three to four times that of the Sun.[6]

References

  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 {{citation}}: Unknown parameter |arXiv= ignored (|arxiv= suggested) (help)
  2. ^ a b c d e f g h LTT 15980 -- High proper-motion Star, database entry, SIMBAD. Accessed on line February 8, 2011.
  3. ^ White, Russel J.; Gabor, Jared M.; Hillenbrand, Lynne A. (2007), "High-Dispersion Optical Spectra of Nearby Stars Younger Than the Sun", The Astronomical Journal, 133 (6): 2524–2536, Bibcode:2007AJ....133.2524W, doi:10.1086/514336 {{citation}}: Unknown parameter |month= ignored (help)
  4. ^ a b c d e Nordström, B.; et al. (2004). "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs". Astronomy and Astrophysics. 418 (3): 989–1019. arXiv:astro-ph/0405198. Bibcode:2004A&A...418..989N. doi:10.1051/0004-6361:20035959. {{cite journal}}: Unknown parameter |month= ignored (help). See the Vizier entry for this star.
  5. ^ Takeda, Y.; et al. (2010), "Behavior of Li abundances in solar-analog stars. II. Evidence of the connection with rotation and stellar activity", Astronomy and Astrophysics, 515: A93, Bibcode:2010A&A...515A..93T, doi:10.1051/0004-6361/200913897 {{citation}}: Unknown parameter |month= ignored (help)
  6. ^ Do Nascimento, J. D., Jr.; et al. (2009). "Age and mass of solar twins constrained by lithium abundance". Astronomy and Astrophysics. 501 (2): 687–694. Bibcode:2009A&A...501..687D. doi:10.1051/0004-6361/200911935. {{cite journal}}: Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)
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