HD 196917

	HD 196917
Observationsdata; Epok: J2000.0
Stjärnbild	Mikroskopet
Rektascension	20t 41m 23,65766s
Deklination	-31° 35′ 53,8334″
Skenbar magnitud ()	+5,74
Stjärntyp
Spektraltyp	M1 III eller M0 III
B–V	+1,53
Variabeltyp	misstänkt
Astrometri
Radialhastighet ()	-97,3 ± 2,3 km/s
Egenrörelse (µ)	RA: +109,914 mas/år; Dek.: -60,256 mas/år
Parallax ()	7,6563 ± 0,0891
Avstånd	426 ± 5 lå (131 ± 2 pc)
Absolut magnitud ()	+0,04
Detaljer
Massa	1,27 M☉
Radie	44,2 ± 2,2 R☉
Luminositet	620 ± +45−20 L☉
Temperatur	3 908 ± 122 K
Metallicitet	-0,28 dex
Andra beteckningar
	17 G. Microscopii, HD 196917, CD-32 16130, CPD-32 6177, FK5 3652, GC 28808, GSC 07456-00163, HIC 102092, HIP 102092, HR 7909, IRAS 20382-3146, IRC-30434, 2MASS J20412364-3135535, NSV 25227, PLX 4927, PPM 300482, SAO 212345, TIC 441396067, TYC 7456-163-1, Gaia DR2 6793297820158820224, Gaia DR3 6793297820158820224

HD 196917 (HR 7909; 17 G. Microscopii; NSV 25227) är en ensam stjärna^[15] belägen i stjärnbilden Mikroskopet. Den är svagt synlig för blotta ögat som en rödfärgad ljuspunkt med en skenbar magnitud av 5,74.^[3] Gaia DR3-parallaxmätningar anger ett avstånd på 426 ljusår och^[2] den rör sig närmare solsystemet med en heliocentrisk radialhastighet av -97,3 km/s.^[8] På sitt nuvarande avstånd är HD 196917:s ljusstyrka minskad med 0,13 magnitud på grund av interstellär utsläckning^[16] och den har en absolut magnitud på +0,04.

Observationer

Stjärnans variation upptäcktes först 1997 av Hipparcos-uppdraget.^[17] Den fann variationer mellan 5,82 och 5,86 i Hipparcos passband. Koen & Lyer (2002) observerade visuella variationer från stjärnan och fann att HD 196917 varierar med 0,009 magnitud med en period av 21,01 timmar.^[18] Sedan 2004 har dess variation inte bekräftats.^[19]

Egenskaper

HD 196917 är av spektralklass antingen M1 III^[4] eller M0 III,^[5] vilket anger att den är en utvecklad jättestjärna av spektraltyp M. Den befinner sig på den asymptotiska jättegrenen,^[20] och genererar energi genom kärnfusion i väte- och heliumskal kring en inert kolkärna. Den har en massa av 1,27 solmassa^[9] och har expanderat till en radie av 44,2 solradier.^[10] Den utstrålar energi från dess förstorade fotosfär motsvarande 620 gånger solens luminositet^[2] vid en effektiv temperatur av ca 3 900 K.^[11] HD 196917 är metallfattig med en järnhalt på [Fe/H] = -0,28 eller 52,5 procent av solens.^[9]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, HD 196917, 26 november 2025.

Noter

1 2 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 8 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 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. S2CID 17128864.
1 2 Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Declinations −40° to −26°. Vol. 3. Bibcode:1982mcts.book.....H.
1 2 Evans, D. S.; Menzies, A.; Stoy, R. H. (October 1, 1957). "Fundamental Data for Southern Stars (First List)". Monthly Notices of the Royal Astronomical Society. 117 (5). Oxford University Press (OUP): 534–561. Bibcode:1957MNRAS.117..534E. doi:10.1093/mnras/117.5.534. ISSN 0035-8711. S2CID 120032200.
↑ 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.
↑ Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. eISSN 1562-6881. ISSN 1063-7729. S2CID 125853869.
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 Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361. S2CID 131780028.
1 2 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 2004). "The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361. S2CID 6077801.
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.
↑ 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+7909. Hämtad 2026-03-09.
↑ "HD 196917". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 12 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.
↑ Perryman, M. A. C.; Lindegren, L.; Kovalevsky, J.; Hoeg, E.; Bastian, U.; Bernacca, P. L.; Crézé, M.; Donati, F.; Grenon, M.; Grewing, M.; van Leeuwen, F. (July 1997). "The HIPPARCOS Catalogue". Astronomy and Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P. ISSN 0004-6361.
↑ Koen, Chris; Eyer, Laurent (March 2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331 (1): 45–59. arXiv:astro-ph/0112194. Bibcode:2002MNRAS.331...45K. doi:10.1046/j.1365-8711.2002.05150.x. eISSN 1365-2966. ISSN 0035-8711. S2CID 10505995.
↑ 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.
↑ Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239. ISSN 0004-6256. S2CID 121672252.

[A-1] 1 2 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 8 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 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. S2CID 17128864.

[E-4] 1 2 Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Declinations −40° to −26°. Vol. 3. Bibcode:1982mcts.book.....H.

[F-5] 1 2 Evans, D. S.; Menzies, A.; Stoy, R. H. (October 1, 1957). "Fundamental Data for Southern Stars (First List)". Monthly Notices of the Royal Astronomical Society. 117 (5). Oxford University Press (OUP): 534–561. Bibcode:1957MNRAS.117..534E. doi:10.1093/mnras/117.5.534. ISSN 0035-8711. S2CID 120032200.

[G-6] 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.

[H-7] Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. eISSN 1562-6881. ISSN 1063-7729. S2CID 125853869.

[I-8] 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.

[J-9] 1 2 3 4 Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361. S2CID 131780028.

[K-10] 1 2 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 2004). "The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361. S2CID 6077801.

[L-11] 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.

[M-12] 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-13] ttps://simbad.cds.unistra.fr/simbad/sim-id?Ident=HR+7909. Hämtad 2026-03-09.

[N-14] "HD 196917". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 12 oktober 2023.

[O-15] 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.

[P-16] 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.

[Q-17] Perryman, M. A. C.; Lindegren, L.; Kovalevsky, J.; Hoeg, E.; Bastian, U.; Bernacca, P. L.; Crézé, M.; Donati, F.; Grenon, M.; Grewing, M.; van Leeuwen, F. (July 1997). "The HIPPARCOS Catalogue". Astronomy and Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P. ISSN 0004-6361.

[R-18] Koen, Chris; Eyer, Laurent (March 2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331 (1): 45–59. arXiv:astro-ph/0112194. Bibcode:2002MNRAS.331...45K. doi:10.1046/j.1365-8711.2002.05150.x. eISSN 1365-2966. ISSN 0035-8711. S2CID 10505995.

[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.

[D-20] Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239. ISSN 0004-6256. S2CID 121672252.

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Observationsdata Epok: J2000.0
HD 196917

Stjärnbild	Mikroskopet^[1]
Rektascension	20^t 41^m 23,65766^s^[2]
Deklination	-31° 35′ 53,8334″^[2]
Skenbar magnitud ( $V$ )	+5,74^[3]
Stjärntyp
Spektraltyp	M1 III^[4] eller M0 III^[5]
B–V	+1,53^[6]
Variabeltyp	misstänkt^[7]
Astrometri
Radialhastighet ( $R_{v}$ )	-97,3 ± 2,3^[8] km/s
Egenrörelse (µ)	RA: +109,914^[2] mas/år Dek.: -60,256^[2] mas/år
Parallax ( $\pi$ )	7,6563 ± 0,0891^[2]
Avstånd	426 ± 5 lå (131 ± 2 pc)
Absolut magnitud ( $M_{V}$ )	+0,04^[1]
Detaljer
Massa	1,27^[9] M_☉
Radie	44,2 ± 2,2^[10] R_☉
Luminositet	620 ± ⁺⁴⁵₋₂₀^[2] L_☉
Temperatur	3 908 ± 122^[11] K
Metallicitet	-0,28^[9] dex
Andra beteckningar
17 G. Microscopii,^[12] HD 196917, CD-32 16130, CPD-32 6177, FK5 3652, GC 28808, GSC 07456-00163, HIC 102092, HIP 102092, HR 7909, IRAS 20382-3146, IRC-30434, 2MASS J20412364-3135535, NSV 25227, PLX 4927, PPM 300482, SAO 212345, TIC 441396067, TYC 7456-163-1, Gaia DR2 6793297820158820224, Gaia DR3 6793297820158820224^[13]^[14]