HD 222806

	HD 222806
Observationsdata; Epok: J2000.0
Stjärnbild	Oktanten
Rektascension	23t 44m 40,8646s
Deklination	-78° 47′ 29,1861 ″
Skenbar magnitud ()	5,74 ± 0,01
Stjärntyp
Spektraltyp	K1 III
U–B	+1,06
B–V	+1,11
Astrometri
Radialhastighet ()	+21,3 ± 0,8 km/s
Egenrörelse (µ)	RA: +49,327 mas/år; Dek.: +7,345 mas/år
Parallax ()	5,7766 ± 0,0592
Avstånd	565 ± 6 lå (173 ± 2 pc)
Absolut magnitud ()	-0,11
Detaljer
Massa	1,26 M☉
Radie	18,77 R☉
Luminositet	151 ± 2 L☉
Temperatur	4 865 ± 122 K
Metallicitet	+0,37
Vinkelhastighet	<1 km/s
Andra beteckningar
	85 G. Octantis, HD 222806, CPD-79 1239, FK5 3906, GSC 09485-00945, HIC 117125, HIP 117125, HR 8995, IRAS 23416-7904, 2MASS J23444082-7847290, PPM 375801, SAO 258179, TYC 9485-945-1, Gaia DR2 6353002585000776064, Gaia DR3 6353002585000776064

HD 222806 eller HR 8995 är en dubbelstjärna belägen i den mellersta delen av stjärnbilden Oktanten. Den har en skenbar magnitud av ca 5,74^[2] och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 3 på ca 5,78 mas,^[1] beräknas den befinna sig på ett avstånd på ca 565 ljusår (173 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 21 km/s.^[5]

Egenskaper

Primärstjärnan HD 222806 A är en orange till röd jättestjärna av spektralklass K1 III.^[3] Den har en massa som är lika med ca 1,3^[7] solmassa, en radie som är ca 19^[8] solradier och utsänder energi från dess fotosfär motsvarande ca 151 gånger solen^[9] vid en effektiv temperatur av ca 4 900 K.^[10] Stjärnan har ett överskott av järn som är ungefär dubbelt mot det hos solen och antas vara en medlem i Vintergatans unga skivpopulation.^[11]

HD 222806 är en misstänkt astrometrisk dubbelstjärna.^[16]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, HD 222806, 24 februari 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 255204555.
^ [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.
^ [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] 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] 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] Eggen, O. J. (February 1994). "Evolved GK stars near the Sun. 2: The young disk population". The Astronomical Journal. 107: 594. Bibcode:1994AJ....107..594E. doi:10.1086/116879. ISSN 0004-6256.
^ 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.
^ HR 8995 (unistra.fr). Hämtad 2023-09-23.
^ "HD 222806". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 8 juni 2022.
^ 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.
^ 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.

[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 255204555.

[G-7] [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.

[H-8] [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.

[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] 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.

[K-11] [a b] Eggen, O. J. (February 1994). "Evolved GK stars near the Sun. 2: The young disk population". The Astronomical Journal. 107: 594. Bibcode:1994AJ....107..594E. doi:10.1086/116879. ISSN 0004-6256.

[L-12] 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.

[SIMBAD-13] HR 8995 (unistra.fr). Hämtad 2023-09-23.

[M-14] "HD 222806". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 8 juni 2022.

[N-15] 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.

[O-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.

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Observationsdata Epok: J2000.0
HD 222806

Stjärnbild	Oktanten
Rektascension	23^t 44^m 40,8646^s^[1]
Deklination	-78° 47′ 29,1861 ″^[1]
Skenbar magnitud ( $V$ )	5,74 ± 0,01^[2]
Stjärntyp
Spektraltyp	K1 III^[3]
U–B	+1,06^[4]
B–V	+1,11^[4]
Astrometri
Radialhastighet ( $R_{v}$ )	+21,3 ± 0,8^[5] km/s
Egenrörelse (µ)	RA: +49,327^[1] mas/år Dek.: +7,345^[1] mas/år
Parallax ( $\pi$ )	5,7766 ± 0,0592^[1]
Avstånd	565 ± 6 lå (173 ± 2 pc)
Absolut magnitud ( $M_{V}$ )	-0,11^[6]
Detaljer
Massa	1,26^[7] M_☉
Radie	18,77^[8] R_☉
Luminositet	151 ± 2^[9] L_☉
Temperatur	4 865 ± 122^[10] K
Metallicitet	+0,37^[11]
Vinkelhastighet	<1^[12] km/s
Andra beteckningar
85 G. Octantis, HD 222806, CPD-79 1239, FK5 3906, GSC 09485-00945, HIC 117125, HIP 117125, HR 8995, IRAS 23416-7904, 2MASS J23444082-7847290, PPM 375801, SAO 258179, TYC 9485-945-1, Gaia DR2 6353002585000776064, Gaia DR3 6353002585000776064^[13]^[14]^[15]