HD 201647

	HD 201647
Observationsdata; Epok: J2000.0
Stjärnbild	Mikroskopet
Rektascension	21t 12m 13,71281s
Deklination	-40° 16′ 09,7010″
Skenbar magnitud ()	+5,83 (5,83-5,86)
Stjärntyp
Spektraltyp	F5 V
B–V	+0,45
Variabeltyp	misstänkt
Astrometri
Radialhastighet ()	+4,5 ± 0,9 km/s
Egenrörelse (µ)	RA: +58,359 mas/år; Dek.: -218,773 mas/år
Parallax ()	31,4586 ± 0,0401
Avstånd	103,7 ± 0,1 lå (31,79 ± 0,04 pc)
Absolut magnitud ()	+3,33
Detaljer
Massa	1,28 M☉
Radie	1,47 +0,07−0,04 R☉
Luminositet	3,79 ± 0,01 L☉
Temperatur	6 637 ± 80 K
Metallicitet	+0,06 ± 0,01 dex
Vinkelhastighet	25,1 ± 2,5 km/s
Ålder	916 miljoner år
Andra beteckningar
	55 G. Microscopii, AKARI-IRC-V1 J2112137-401610, CD-40 14216, CPD-40 9488, GC 29614, GJ 9726, HD 201647, HIC 104680, HIP 104680, R 8100, IRAS 21090-4028, LTT 8410, 2MASS J21121372-4016095, NLTT 50740, NSV 25506, PLX 5095, PPM 326968, 1RXS J211214.2-401610, SAO 230575, TD1 27756, TIC 159670453, TYC 7970-450-1, uvby98 100201647, WISEA J211213.77-401612.0, Gaia DR2 6581679185145249920, Gaia DR3 6581679185145249920

HD 201647 (HR 8100; Gliese 9726; LTT 8410) är en ensam stjärna^[16] belägen i stjärnbilden Mikroskopet. Den är svagt synlig för blotta ögat som en gulvit stjärna med en skenbar magnitud av 5,83.^[3] Stjärnen är belägen på ett avstånd av ca 104 ljusår från solsystemet, baserat på Gaia DR3 parallaxmätningar, och rör sig bort från solen med en heliocentrisk radialhastighet på 4,5 km/s.^[7] På dess avstånd är HD 201647:s luminositet minskad med 0,11 magnitud på grund av interstellär nedskymning^[17] och den har en absolut magnitud på +3,33.^[1] Den har en relativt hög egenrörelse över himmelsfären och rör sig med en hastighet av 226,331 mas/år.^[18]

I upptäcktsartikeln för Lacaille 8760 rapporterades HD 201647 vara en variabel stjärna som varierade mellan 5,83 och 5,86 i det visuella passbandet.^[4] År 2004 hade det dock inte bekräftats att den är variabel.^[19]

Egenskaper

HD 201647 är en stjärna av spektralklass F5 V,^[6]^[5] vilken anger att den är en vanlig huvudseriestjärna av spektraltyp F, som genererar energi genom kärnfusion av väte i dess kärna. Den har en massa motsvarande 1,28 solmassa^[8] och en radie av 1,47 gånger solradie.^[9] Den anger energi motsvarande 3,79 gånger solens luminositet^[2] från dess fotosfär vid en effektiv temperatur av 6 637 K.^[10] HD 201647 är något metallberikad med en järnhalt på [Fe/H] = +0,06 eller 115 procent av solens.^[11] Den har en uppskattad ålder av 916 miljoner år^[8] och roterar med en beräknad projicerad rotationshastighet av 25,1 km/s.^[12]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, HD 201647, 26 november 2025.

Noter

1 2 3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
1 2 3 4 5 6 7 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
1 2 3 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
1 2 3 Byrne, Patrick B. (June 1981). "Gliese 825 – a new flare star". Monthly Notices of the Royal Astronomical Society. 195 (2). Oxford University Press (OUP): 143–147. Bibcode:1981MNRAS.195..143B. doi:10.1093/mnras/195.2.143. ISSN 0035-8711. S2CID 123025779.
1 2 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2 June 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. eISSN 1538-3881. ISSN 0004-6256. S2CID 250741593.
1 2 Adams, Walter S.; Joy, Alfred H.; Humason, Milton L.; Brayton, Ada Margaret (April 1935). "The Spectroscopic Absolute Magnitudes and Parallaxes of 4179 Stars". The Astrophysical Journal. 81: 187. Bibcode:1935ApJ....81..187A. doi:10.1086/143628. eISSN 1538-4357. ISSN 0004-637X. S2CID 121056016.
1 2 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. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
1 2 3 4 David, Trevor J.; Hillenbrand, Lynne A. (12 May 2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. eISSN 1538-4357. S2CID 33401607.
1 2 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881. hdl:1721.1/124721. S2CID 166227927.
1 2 Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (26 May 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s): Improved astrophysical parameters for the Geneva-Copenhagen Survey⋆". Astronomy & Astrophysics. 530: A138. arXiv:1103.4651. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276. eISSN 1432-0746. ISSN 0004-6361. S2CID 56118016.
1 2 Netopil, Martin (4 May 2017). "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system". Monthly Notices of the Royal Astronomical Society. 469 (3): 3042–3055. arXiv:1705.00883. Bibcode:2017MNRAS.469.3042N. doi:10.1093/mnras/stx1077. eISSN 1365-2966. ISSN 0035-8711. S2CID 119034918.
1 2 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars V: Southern stars *". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. eISSN 1432-0746. ISSN 0004-6361. S2CID 54046583.
↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
↑ https://simbad.cds.unistra.fr/simbad/sim-id?Ident=HR+8100. Hämtad 2026-03-13.
↑ "HD 201647". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 14 oktober 2023.
↑ Eggleton, P. P.; Tokovinin, A. A. (11 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. eISSN 1365-2966. ISSN 0035-8711. S2CID 14878976.
↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.
↑ Knapp, Wilfried; Nanson, John (January 2019). "A Catalog of High Proper Motion Stars in the Southern Sky (HPMS3 Catalog)". Journal of Double Star Observations. 15 (1): 21–41. Bibcode:2019JDSO...15...21K.
↑ Samus, N. N.; Durlevich, O. V. (November 2004). "VizieR Online Data Catalog: Combined General Catalogue of Variable Stars (Samus+ 2004)". VizieR Online Data Catalog: II/250. Bibcode:2004yCat.2250....0S.

[A-1] 1 2 3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.

[B-2] 1 2 3 4 5 6 7 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[C-3] 1 2 3 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.

[D-4] 1 2 3 Byrne, Patrick B. (June 1981). "Gliese 825 – a new flare star". Monthly Notices of the Royal Astronomical Society. 195 (2). Oxford University Press (OUP): 143–147. Bibcode:1981MNRAS.195..143B. doi:10.1093/mnras/195.2.143. ISSN 0035-8711. S2CID 123025779.

[E-5] 1 2 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2 June 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. eISSN 1538-3881. ISSN 0004-6256. S2CID 250741593.

[F-6] 1 2 Adams, Walter S.; Joy, Alfred H.; Humason, Milton L.; Brayton, Ada Margaret (April 1935). "The Spectroscopic Absolute Magnitudes and Parallaxes of 4179 Stars". The Astrophysical Journal. 81: 187. Bibcode:1935ApJ....81..187A. doi:10.1086/143628. eISSN 1538-4357. ISSN 0004-637X. S2CID 121056016.

[G-7] 1 2 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. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.

[H-8] 1 2 3 4 David, Trevor J.; Hillenbrand, Lynne A. (12 May 2015). "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. eISSN 1538-4357. S2CID 33401607.

[I-9] 1 2 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881. hdl:1721.1/124721. S2CID 166227927.

[K-10] 1 2 Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (26 May 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s): Improved astrophysical parameters for the Geneva-Copenhagen Survey⋆". Astronomy & Astrophysics. 530: A138. arXiv:1103.4651. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276. eISSN 1432-0746. ISSN 0004-6361. S2CID 56118016.

[L-11] 1 2 Netopil, Martin (4 May 2017). "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system". Monthly Notices of the Royal Astronomical Society. 469 (3): 3042–3055. arXiv:1705.00883. Bibcode:2017MNRAS.469.3042N. doi:10.1093/mnras/stx1077. eISSN 1365-2966. ISSN 0035-8711. S2CID 119034918.

[M-12] 1 2 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars V: Southern stars *". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. eISSN 1432-0746. ISSN 0004-6361. S2CID 54046583.

[N-13] Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.

[SIMBAD-14] ttps://simbad.cds.unistra.fr/simbad/sim-id?Ident=HR+8100. Hämtad 2026-03-13.

[O-15] "HD 201647". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 14 oktober 2023.

[P-16] Eggleton, P. P.; Tokovinin, A. A. (11 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. eISSN 1365-2966. ISSN 0035-8711. S2CID 14878976.

[Q-17] Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.

[R-18] Knapp, Wilfried; Nanson, John (January 2019). "A Catalog of High Proper Motion Stars in the Southern Sky (HPMS3 Catalog)". Journal of Double Star Observations. 15 (1): 21–41. Bibcode:2019JDSO...15...21K.

[S-19] Samus, N. N.; Durlevich, O. V. (November 2004). "VizieR Online Data Catalog: Combined General Catalogue of Variable Stars (Samus+ 2004)". VizieR Online Data Catalog: II/250. Bibcode:2004yCat.2250....0S.

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Observationsdata Epok: J2000.0
HD 201647

Stjärnbild	Mikroskopet^[1]
Rektascension	21^t 12^m 13,71281^s^[2]
Deklination	-40° 16′ 09,7010″^[2]
Skenbar magnitud ( $V$ )	+5,83^[3] (5,83-5,86)^[4]
Stjärntyp
Spektraltyp	F5 V^[5]^[6]
B–V	+0,45^[3]
Variabeltyp	misstänkt^[4]
Astrometri
Radialhastighet ( $R_{v}$ )	+4,5 ± 0,9^[7] km/s
Egenrörelse (µ)	RA: +58,359^[2] mas/år Dek.: -218,773^[2] mas/år
Parallax ( $\pi$ )	31,4586 ± 0,0401^[2]
Avstånd	103,7 ± 0,1 lå (31,79 ± 0,04 pc)
Absolut magnitud ( $M_{V}$ )	+3,33^[1]
Detaljer
Massa	1,28^[8] M_☉
Radie	1,47 ^+0,07_−0,04^[9] R_☉
Luminositet	3,79 ± 0,01^[2] L_☉
Temperatur	6 637 ± 80^[10] K
Metallicitet	+0,06 ± 0,01^[11] dex
Vinkelhastighet	25,1 ± 2,5^[12] km/s
Ålder	916^[8] miljoner år
Andra beteckningar
55 G. Microscopii,^[13] AKARI-IRC-V1 J2112137-401610, CD-40 14216, CPD-40 9488, GC 29614, GJ 9726, HD 201647, HIC 104680, HIP 104680, R 8100, IRAS 21090-4028, LTT 8410, 2MASS J21121372-4016095, NLTT 50740, NSV 25506, PLX 5095, PPM 326968, 1RXS J211214.2-401610, SAO 230575, TD1 27756, TIC 159670453, TYC 7970-450-1, uvby98 100201647, WISEA J211213.77-401612.0, Gaia DR2 6581679185145249920, Gaia DR3 6581679185145249920^[14]^[15]