HD 198716

	HD 198716
Observationsdata; Epok: J2000.0
Stjärnbild	Mikroskopet
Rektascension	20t 53m 40,18538s
Deklination	-39° 48′ 35,5092″
Skenbar magnitud ()	+5,33 ± 0,01
Stjärntyp
Spektraltyp	K2 III
B–V	+1,32
Astrometri
Radialhastighet ()	+20,1 ± 2,8 km/s
Egenrörelse (µ)	RA: +43,548 mas/år; Dek.: -97,023 mas/år
Parallax ()	8,2435 ± 0,0774
Avstånd	396 ± 4 lå (121 ± 1 pc)
Absolut magnitud ()	-0,1
Detaljer
Massa	2,45 ± 0,12 M☉
Radie	23,9 R☉
Luminositet	160 ± 3 L☉
Temperatur	4 453 ± 122 K
Metallicitet	-0,04 dex
Vinkelhastighet	2 ± 1,3 km/s
Ålder	622 +275−64 miljoner år
Andra beteckningar
	33 G. Microscopii, HD 198716, CD-40 14078, CPD-40 9399, GC 29127, GSC 07968-00239, HIC 103127, HIP 103127, HR 7987, IRAS 20504-3959, 2MASS J20534019-3948357, PLX 4991, PPM 300744, SAO 212522, TYC 7968-239-1, Gaia DR2 6774564036104416128, Gaia DR3 6774564036104416128

HD 198716, även känd som HR 7987 eller 33 G. Microscopii, är en ensam stjärna^[15] belägen i stjärnbilden Mikroskopet.^[14] Eggen (1993) listar den som en medlem av populationen av Vintergatans gamla skiva.^[10]

Stjärnan har en skenbar magnitud av 5,33,^[3] vilket gör den svagt synlig för blotta ögat under ideala förhållanden. Baserat på parallaxmätningar från Gaia-teleskopet uppskattas den befinna sig på ett avstånd av 396 ljusår från solsystemet^[2] och rör sig närmare solen med en något begränsad heliocentrisk radialhastighet av ca 20 km/s.^[6] På detta avstånd från solen minskar HD 198716:s luminositet med 0,1 magnitud på grund av interstellärt stoft.^[16]

Egenskaper

HD 198357 är en utvecklad röd jättestjärna av spektralklass K2 III. Den har en massa motsvarande 2,45 solmassor^[7] och har vid en ålder av 622 miljoner år^[2] expanderat till en radie av 23,9 solradier.^[8] Den utstrålar energi motsvarande 160 gånger solens luminositet^[2] från dess fotosfär vid en effektiv temperatur av 4 453 K,^[9] vilket ger den en orange färgnyans. HD 198716 har en liten metallbrist och roterar måttligt med en projicerad rotationshastighet på ca 2 km/s.^[11]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, HD 198716, 31 oktober 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 9 10 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.
↑ Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume III: Declinations −40° to −26°. Bibcode:1982mcts.book.....H.
↑ 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 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 Kervella, Pierre; Arenou, Frédéric; Mignard, François; Thévenin, Frédéric (March 2019). "Stellar and substellar companions of nearby stars from Gaia DR2". Astronomy & Astrophysics. 623 (4): A72. arXiv:1901.09170. Bibcode:2019MNRAS.484.4619G. doi:10.1051/0004-6361/201834371. eISSN 1432-0746. ISSN 0004-6361.
1 2 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. eISSN 1432-0746. ISSN 0004-6361.
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 Eggen, O. J. (July 1993). "Evolved GK stars near the sun. I - The old disk population". The Astronomical Journal. 106: 80. Bibcode:1993AJ....106...80E. doi:10.1086/116622.
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". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. eISSN 1432-0746. ISSN 0004-6361.
↑ 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+7987. Hämtad 2026-03-12.
1 2 "HD 198716". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 24 november 2022.
↑ 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.
↑ 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.

[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 9 10 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.

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

[E-5] 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.

[F-6] 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.

[G-7] 1 2 Kervella, Pierre; Arenou, Frédéric; Mignard, François; Thévenin, Frédéric (March 2019). "Stellar and substellar companions of nearby stars from Gaia DR2". Astronomy & Astrophysics. 623 (4): A72. arXiv:1901.09170. Bibcode:2019MNRAS.484.4619G. doi:10.1051/0004-6361/201834371. eISSN 1432-0746. ISSN 0004-6361.

[H-8] 1 2 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. eISSN 1432-0746. ISSN 0004-6361.

[J-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 Eggen, O. J. (July 1993). "Evolved GK stars near the sun. I - The old disk population". The Astronomical Journal. 106: 80. Bibcode:1993AJ....106...80E. doi:10.1086/116622.

[L-11] 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". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. eISSN 1432-0746. ISSN 0004-6361.

[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+7987. Hämtad 2026-03-12.

[N-14] 1 2 "HD 198716". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 24 november 2022.

[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.

[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.

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Observationsdata Epok: J2000.0
HD 198716

Stjärnbild	Mikroskopet^[1]
Rektascension	20^t 53^m 40,18538^s^[2]
Deklination	-39° 48′ 35,5092″^[2]
Skenbar magnitud ( $V$ )	+5,33 ± 0,01^[3]
Stjärntyp
Spektraltyp	K2 III^[4]
B–V	+1,32^[5]
Astrometri
Radialhastighet ( $R_{v}$ )	+20,1 ± 2,8^[6] km/s
Egenrörelse (µ)	RA: +43,548^[2] mas/år Dek.: -97,023^[2] mas/år
Parallax ( $\pi$ )	8,2435 ± 0,0774^[2]
Avstånd	396 ± 4 lå (121 ± 1 pc)
Absolut magnitud ( $M_{V}$ )	-0,1^[1]
Detaljer
Massa	2,45 ± 0,12^[7] M_☉
Radie	23,9^[8] R_☉
Luminositet	160 ± 3^[2] L_☉
Temperatur	4 453 ± 122^[9] K
Metallicitet	-0,04^[10] dex
Vinkelhastighet	2 ± 1,3^[11] km/s
Ålder	622 ⁺²⁷⁵₋₆₄^[2] miljoner år
Andra beteckningar
33 G. Microscopii,^[12] HD 198716, CD-40 14078, CPD-40 9399, GC 29127, GSC 07968-00239, HIC 103127, HIP 103127, HR 7987, IRAS 20504-3959, 2MASS J20534019-3948357, PLX 4991, PPM 300744, SAO 212522, TYC 7968-239-1, Gaia DR2 6774564036104416128, Gaia DR3 6774564036104416128^[13]^[14]