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Bayer designation
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{{Starbox begin
{{Starbox begin
| name = δ Microscopii
| name = Delta Microscopii
}}
}}
{{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 = [[Microscopium]]
| constell = [[Microscopium (constellation)|Microscopium]]
| ra = {{RA|20|06|01.14597}}<ref name=vanLeeuwen2007/>
|ra= {{RA|20|06|01.14597}} .<ref name=SIMBAD>SIMBAD, [http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Delta+Microscopii&submit=SIMBAD+search Delta Microscopii] (accessed 20 March 2015)</ref>
|dec= {{DEC|&minus;30|07|30.4290}} <ref name=SIMBAD/>
| dec = {{DEC|−30|07|30.4290}}<ref name=vanLeeuwen2007/>
| appmag_v = 5.70
| appmag_v = 5.68<ref name=Lake1965/>
}}
}}
{{Starbox character
{{Starbox character
| class = KOIII
| class = K0/1&nbsp;III<ref name=houk1979/>
| b-v = +1.03<ref name=Lake1965/>
| u-b =
| b-v =
| u-b =
| r-i =
| variable =
}}
}}
{{Starbox astrometry
{{Starbox astrometry
| parallax = 10.82
| radial_v =
| prop_mo_ra = +33.46<ref name=vanLeeuwen2007/>
| p_error = 0.64
| prop_mo_dec = −67.91<ref name=vanLeeuwen2007/>
| parallax_footnote = <ref name="vanLeeuwen2007">{{cite journal | first=F. | last=van Leeuwen | title=Validation of the New Hipparcos Reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–64 | date=2007 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | arxiv=0708.1752}}</ref>
| absmag_v =
| parallax = 10.82
| p_error = 0.64
| parallax_footnote = <ref name=vanLeeuwen2007/>
| absmag_v =
}}
{{Starbox orbit
| reference = <ref name=bluhm2016/>
| period_unitless = {{Val|1599.3|8.15|u=d|fmt=commas}}
| eccentricity = 0.2
| periastron = {{nowrap|2453878.5 ± 3.59 JD}}
| periarg = {{Val|194.4|2.40}}
| k1 = {{Val|5581.3|5.42|fmt=commas}}
}}
{{Starbox detail
| source = <ref name=Jones2011/>
| component1 = δ Mic A
| mass = 1.96
| radius = 10.87
| luminosity = 57
| temperature = 4,805
| gravity = 2.45
| metal_fe = {{Val|0.03|0.11}}
| rotational_velocity = 2.12
| age_gyr =
}}
}}
{{Starbox catalog
{{Starbox catalog
| names = [[Bayer designation|Delta&nbsp;Microscopii]], Delta&nbsp;Mic, [[Henry Draper Catalogue|HD]]&nbsp;200718, [[Hipparcos Catalogue|HIP]]&nbsp;104148, [[Bright Star Catalogue|HR]]&nbsp;8070, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;212709
| names = {{odlist | B=δ&nbsp;Mic | CD=−39°&nbsp;14089 | FK5=3683 | HD=200718 | HIP=104148 | HR=8070 | SAO=212709 }}<ref name=SIMBAD/>
}}
{{Starbox reference
| Simbad = del+Mic
}}
}}
{{Starbox reference|Simbad=del+Mic}}
{{Starbox end}}
{{Starbox end}}
'''δ Microscopii''', Latinised as '''Delta Microscopii''', is a faint, orange hued [[binary star]] system in the [[constellation]] [[Microscopium (constellation)|Microscopium]], marking the eyepiece end of the "microscope".<ref name=Ridpath/> It is just visible to the naked eye with an [[apparent visual magnitude]] of +5.68.<ref name=Lake1965/> Based upon an annual [[parallax]] shift of 10.82&nbsp;[[milliarcsecond|mas]] as seen from the Earth,<ref name=vanLeeuwen2007/> it is roughly 300&nbsp;[[light year]]s from the [[Sun]]. At that distance, the visual magnitude is diminished by an [[extinction (astronomy)|extinction factor]] of 0.142 due to [[interstellar dust]].<ref name=Jones2011/>


This is a single-lined [[spectroscopic binary]] with an [[orbital period]] of 4.4&nbsp;years and an [[orbital eccentricity|eccentricity]] of 0.2.<ref name=bluhm2016/> The visible component is an [[stellar evolution|evolved]] [[K-type star|K-type]] [[giant star]] with a [[stellar classification]] of K0/1&nbsp;III.<ref name=houk1979/> It is currently on the [[horizontal branch]] and thus is generating energy through [[helium fusion]] at its [[stellar core|core]].<ref name=Jones2011/> Delta Microscopii has nearly twice the [[mass of the Sun]] and has expanded to 11 times the [[Sun's radius]]. The star is radiating 57 times the [[Sun's luminosity]] from its enlarged [[photosphere]] at an [[effective temperature]] of 4,805&nbsp;K.<ref name=Jones2011/>
'''δ Microscopii''', Latinised as '''Delta Microscopii''', is a [[star]] in the [[constellation]] [[Microscopium (constellation)|Microscopium]]. It is an orange giant star of spectral type K0III and [[apparent magnitude]] is 5.70.<ref name=SIMBAD/> Located around 301 light-years distant, it shines with a [[luminosity]] approximately 46 times that of the Sun and has a surface temperature of 5049 K.<ref name=Mcdonald>{{cite journal|author=McDonald, I.|author2=Zijlstra, A. A.|author3=Boyer, M. L.|date=2012|title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars|journal=Monthly Notices of the Royal Astronomical Society|volume=427|issue=1|pages=343–57|bibcode=2012MNRAS.427..343M|arxiv = 1208.2037 |doi = 10.1111/j.1365-2966.2012.21873.x }}</ref> It marks the eyepiece end of the microscope.<ref>{{cite web| first=Ian | last=Ridpath | title=Star Tales – Microscopium| url = http://www.ianridpath.com/startales/microscopium.htm}}</ref>


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


<ref name=vanLeeuwen2007>{{citation
{{Stars of Microscopium}}
| title=Validation of the new Hipparcos reduction
| last1=van Leeuwen | first1=F.
| journal=Astronomy and Astrophysics
| volume=474 | issue=2 | pages=653–664 | date=2007
| arxiv=0708.1752 | bibcode=2007A&A...474..653V
| doi=10.1051/0004-6361:20078357 | postscript=. }}</ref>

<ref name=houk1979>{{citation
| title=Michigan catalogue of two-dimensional spectral types for the HD stars
| volume=3 | last1=Houk | first1=Nancy | postscript=.
| publication-place=Ann Arbor, Michigan
| publisher=Dept. of Astronomy, University of Michigan
| date=1979 | bibcode=1982MSS...C03....0H }}</ref>

<ref name=bluhm2016>{{citation
| title=New spectroscopic binary companions of giant stars and updated metallicity distribution for binary systems
| journal=Astronomy & Astrophysics
| display-authors=1 | last1=Bluhm | first1=P.
| last2=Jones | first2=M. I. | last3=Vanzi | first3=L.
| last4=Soto | first4=M. G. | last5=Vos | first5=J.
| last6=Wittenmyer | first6=R. A. | last7=Drass | first7=H.
| last8=Jenkins | first8=J. S. | last9=Olivares | first9=F.
| last10=Mennickent | first10=R. E. | last11=Vučković | first11=M.
| last12=Rojo | first12=P. | last13=Melo | first13=C. H. F.
| volume=593 | pages=A133 | year=2016 | postscript=.
| bibcode=2016A&A...593A.133B | doi=10.1051/0004-6361/201628459 }}</ref>

<ref name=Lake1965>{{citation
| title=Photometric Magnitudes and Colours for Bright Southern Stars (Sixth List)
| last1=Lake | first1=R.
| journal=Monthly Notes of the Astron. Soc. Southern Africa
| volume=24 | page=41 | year=1965
| bibcode=1965MNSSA..24...41L | postscript=. }}</ref>

<ref name=Jones2011>{{citation
| 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
| last1=Jones | first1=M. I. | last2=Jenkins | first2=J. S.
| last3=Rojo | first3=P. | last4=Melo | first4=C. H. F.
| journal=Astronomy & Astrophysics | display-authors=1
| volume=536 | id=A71 | pages=7 | date=December 2011
| doi=10.1051/0004-6361/201117887 | bibcode=2011A&A...536A..71J
| arxiv=1110.6459 | postscript=. }}</ref>

<ref name=Ridpath>{{citation
| first=Ian | last=Ridpath
| title=Microscopium | work=Star Tales
| url =http://www.ianridpath.com/startales/microscopium.htm
| accessdate=2017-08-14 | postscript=. }}</ref>

<ref name=SIMBAD>{{cite simbad
| title=del Mic | accessdate=2017-08-12 | postscript=. }}</ref>

}}

{{Stars of Microscopium|state=collapsed}}


[[Category:Microscopium (constellation)]]
[[Category:K-type giants]]
[[Category:K-type giants]]
[[Category:Microscopium (constellation)]]
[[Category:Bayer objects|Microscopii, Delta]]
[[Category:Bayer objects|Microscopii, Delta]]
[[Category:Durchmusterung objects]]
[[Category:Hipparcos objects|104148]]
[[Category:Hipparcos objects|104148]]
[[Category:Henry Draper Catalogue objects|200718]]
[[Category:Henry Draper Catalogue objects|200718]]
[[Category:HR objects|8070]]
[[Category:HR objects|8070]]
[[Category:Durchmusterung objects]]

{{giant-star-stub}}

Revision as of 21:37, 14 August 2017

Delta Microscopii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Microscopium
Right ascension 20h 06m 01.14597s[1]
Declination −30° 07′ 30.4290″[1]
Apparent magnitude (V) 5.68[2]
Characteristics
Spectral type K0/1 III[3]
B−V color index +1.03[2]
Astrometry
Proper motion (μ) RA: +33.46[1] mas/yr
Dec.: −67.91[1] mas/yr
Parallax (π)10.82 ± 0.64 mas[1]
Distance300 ± 20 ly
(92 ± 5 pc)
Orbit[4]
Period (P)1,599.3±8.15 d
Eccentricity (e)0.2
Periastron epoch (T)2453878.5 ± 3.59 JD
Argument of periastron (ω)
(secondary)		194.4±2.40°
Semi-amplitude (K1)
(primary)		5,581.3±5.42 km/s
Details[5]
δ Mic A
Mass1.96 M☉
Radius10.87 R☉
Luminosity57 L☉
Surface gravity (log g)2.45 cgs
Temperature4,805 K
Metallicity [Fe/H]0.03±0.11 dex
Rotational velocity (v sin i)2.12 km/s
Other designations
δ Mic, CD−39° 14089, FK5 3683, HD 200718, HIP 104148, HR 8070, SAO 212709[6]
Database references
SIMBADdata

δ Microscopii, Latinised as Delta Microscopii, is a faint, orange hued binary star system in the constellation Microscopium, marking the eyepiece end of the "microscope".[7] It is just visible to the naked eye with an apparent visual magnitude of +5.68.[2] Based upon an annual parallax shift of 10.82 mas as seen from the Earth,[1] it is roughly 300 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.142 due to interstellar dust.[5]

This is a single-lined spectroscopic binary with an orbital period of 4.4 years and an eccentricity of 0.2.[4] The visible component is an evolved K-type giant star with a stellar classification of K0/1 III.[3] It is currently on the horizontal branch and thus is generating energy through helium fusion at its core.[5] Delta Microscopii has nearly twice the mass of the Sun and has expanded to 11 times the Sun's radius. The star is radiating 57 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,805 K.[5]

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, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. ^ a b c Lake, R. (1965), "Photometric Magnitudes and Colours for Bright Southern Stars (Sixth List)", Monthly Notes of the Astron. Soc. Southern Africa, 24: 41, Bibcode:1965MNSSA..24...41L.
  3. ^ a b Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982MSS...C03....0H.
  4. ^ a b Bluhm, P.; et al. (2016), "New spectroscopic binary companions of giant stars and updated metallicity distribution for binary systems", Astronomy & Astrophysics, 593: A133, Bibcode:2016A&A...593A.133B, doi:10.1051/0004-6361/201628459.
  5. ^ a b c d Jones, M. I.; et al. (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: 7, arXiv:1110.6459, Bibcode:2011A&A...536A..71J, doi:10.1051/0004-6361/201117887, A71.
  6. ^ "del Mic". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-12.{{cite web}}: CS1 maint: postscript (link)
  7. ^ Ridpath, Ian, "Microscopium", Star Tales, retrieved 2017-08-14.
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