HD 193721

	HD 193721
Observationsdata; Epok: J2000.0
Stjärnbild	Oktanten
Rektascension	20t 33m 17,6366s
Deklination	-80° 57′ 53,5944 ″
Skenbar magnitud ()	5,77 ± 0,01
Stjärntyp
Spektraltyp	G6/8 II
U–B	+0,85
B–V	+1,14
Astrometri
Radialhastighet ()	+8,6 ± 0,7 km/s
Egenrörelse (µ)	RA: +9,794 mas/år; Dek.: -16,081 mas/år
Parallax ()	4,2823 ± 0,165
Avstånd	760 ± 30 lå (234 ± 9 pc)
Absolut magnitud ()	-0,24
Detaljer
Massa	3,49 M☉
Radie	24,38 R☉
Luminositet	300 ± 5 L☉
Temperatur	4 953 ± 122 K
Metallicitet	-0,15
Vinkelhastighet	2,7 ± 1,1 km/s
Andra beteckningar
	47 G. Octantis, HD 193721, CCDM J20333-8058A, CPD-81 901, FK5 3994, GSC 09472-00737, HIC 101427, HIP 101427, HR 7785, IRAS 20251-8107, 2MASS J20331764-8057537, PPM 378466, SAO 258861, TYC 9472-737-1, uvby98 100193721, WDS J20333-8058A, Gaia DR2 6349381755771519488, Gaia DR3 6349381755771519488

HD 193721 eller HR 7785 är en astrometrisk dubbelstjärna^[15] belägen i den mellersta delen av stjärnbilden Oktanten. Den har en skenbar magnitud av ca 5,77^[2] och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 3 på ca 4,28 mas,^[1] beräknas den befinna sig på ett avstånd på ca 760 ljusår (234 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 8,5 km/s.^[5]

Egenskaper

HD 193721 är en gul till vit ljusstark jättestjärna av spektralklass G6/8 II.^[3] Den har en massa som är ca 3,5^[7] solmassor, en radie som är ca 24,4^[8] solradier och utsänder energi från dess fotosfär motsvarande ca 300 gånger solen^[9] vid en effektiv temperatur av ca 5 000 K.^[8] Stjärnan har en metallicitet på ca 71 procent av solens.^[10]

HD 193721 har en följeslagare betecknad CPD−81°900 av spektralklass F8,^[16] som är separerad med 25,5 bågsekunder vid en positionsvinkel på 0° (1998).^[17] CPD−81°900 är ett förgrundsobjekt som har en högre parallax^[18] och olik egenrörelse.^[17]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, HD 193721, 9 maj 2023..

Noter

^ [a b c d e f] Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
^ [a b] 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.
^ [a b] Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.
^ [a b] 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.
^ [a b] 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. ISSN 1063-7737. S2CID 119231169.
^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.
^ [a b] 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.
^ [a b c d] 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. ISSN 0004-6256.
^ [a b] Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ [a b] 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. ISSN 0004-6361.
^ 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. 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.
^ HR 7785 (unistra.fr). Hämtad 2023-09-16.
^ "HR 7785". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 1 juli 2022.
^ Frankowski, A.; Jancart, S.; Jorissen, A. (19 December 2006). "Proper-motion binaries in the Hipparcos catalogue". Astronomy & Astrophysics. 464 (1): 377–392. arXiv:astro-ph/0612449. Bibcode:2007A&A...464..377F. doi:10.1051/0004-6361:20065526. eISSN 1432-0746. ISSN 0004-6361.
^ Stoy, R. H. (1968). "Cape photographic catalague for 1950.0, zones −80° to −90°". Annals of the Cape Observatory. 22. Bibcode:1968AnCap..22.....S.
^ [a b] Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.
^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.

Externa länkar

https://www.universeguide.com/star/101427/hd193721.

[A-1] [a b c d e f] Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.

[B-2] [a b] 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.

[C-3] [a b] Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.

[D-4] [a b] 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.

[E-5] [a b] 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. ISSN 1063-7737. S2CID 119231169.

[F-6] Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.

[G-7] [a b] 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.

[H-8] [a b c d] 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. ISSN 0004-6256.

[I-9] [a b] Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.

[J-10] [a b] 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. ISSN 0004-6361.

[K-11] 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. ISSN 0004-6361.

[L-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] HR 7785 (unistra.fr). Hämtad 2023-09-16.

[M-14] "HR 7785". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 1 juli 2022.

[N-15] Frankowski, A.; Jancart, S.; Jorissen, A. (19 December 2006). "Proper-motion binaries in the Hipparcos catalogue". Astronomy & Astrophysics. 464 (1): 377–392. arXiv:astro-ph/0612449. Bibcode:2007A&A...464..377F. doi:10.1051/0004-6361:20065526. eISSN 1432-0746. ISSN 0004-6361.

[O-16] Stoy, R. H. (1968). "Cape photographic catalague for 1950.0, zones −80° to −90°". Annals of the Cape Observatory. 22. Bibcode:1968AnCap..22.....S.

[P-17] [a b] Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.

[Q-18] Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.

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Observationsdata Epok: J2000.0
HD 193721

Stjärnbild	Oktanten
Rektascension	20^t 33^m 17,6366^s^[1]
Deklination	-80° 57′ 53,5944 ″^[1]
Skenbar magnitud ( $V$ )	5,77 ± 0,01^[2]
Stjärntyp
Spektraltyp	G6/8 II^[3]
U–B	+0,85^[4]
B–V	+1,14^[4]
Astrometri
Radialhastighet ( $R_{v}$ )	+8,6 ± 0,7^[5] km/s
Egenrörelse (µ)	RA: +9,794^[1] mas/år Dek.: -16,081^[1] mas/år
Parallax ( $\pi$ )	4,2823 ± 0,165^[1]
Avstånd	760 ± 30 lå (234 ± 9 pc)
Absolut magnitud ( $M_{V}$ )	-0,24^[6]
Detaljer
Massa	3,49^[7] M_☉
Radie	24,38^[8] R_☉
Luminositet	300 ± 5^[9] L_☉
Temperatur	4 953 ± 122^[8] K
Metallicitet	-0,15^[10]
Vinkelhastighet	2,7 ± 1,1^[11] km/s
Andra beteckningar
47 G. Octantis,^[12] HD 193721, CCDM J20333-8058A, CPD-81 901, FK5 3994, GSC 09472-00737, HIC 101427, HIP 101427, HR 7785, IRAS 20251-8107, 2MASS J20331764-8057537, PPM 378466, SAO 258861, TYC 9472-737-1, uvby98 100193721, WDS J20333-8058A, Gaia DR2 6349381755771519488, Gaia DR3 6349381755771519488^[13]^[14]

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Egenskaper

Referenser

Noter

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