HD 194612

	HD 194612
Observationsdata; Epok: J2000.0
Stjärnbild	Oktanten
Rektascension	20t 38m 18,6064s
Deklination	-81° 17′ 20,6261 ″
Skenbar magnitud ()	5,89 ± 0,01
Stjärntyp
Spektraltyp	K5 III
U–B	+2,02
B–V	+1,71
Astrometri
Radialhastighet ()	+0,3 ± 0,4 km/s
Egenrörelse (µ)	RA: +1,597 mas/år; Dek.: -37,819 mas/år
Parallax ()	4,3006 ± 0,0707
Avstånd	760 ± 10 lå (233 ± 4 pc)
Absolut magnitud ()	-0,56
Detaljer
Massa	2,1 M☉
Radie	59,9 R☉
Luminositet	598 ± 13 L☉
Temperatur	3 941 ± 122 K
Vinkelhastighet	2,3 ± 1,2 km/s
Andra beteckningar
	49 G. Octantis, HD 194612, CPD-81 906, GSC 09472-00923, HIC 101843, HIP 101843, HR 7812, IRAS 20300-8127, 2MASS J20381867-8117206, PPM 378486, SAO 258864, TYC 9472-923-1, Gaia DR2 6349168274420273280, Gaia DR3 6349168278717707008

HD 1944612 eller HR 7812 är en ensam stjärna^[14] belägen i den mellersta delen av stjärnbilden Oktanten. Den har en skenbar magnitud av ca 5,89^[2] och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 3 på ca 4,30 mas,^[1] beräknas den befinna sig på ett avstånd på ca 760 ljusår (233 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 0,3 km/s.^[5]

Egenskaper

HD 194612 är en orange till röd jättestjärna i huvudserien av spektralklass K5 III,^[3] som befinner sig på den röda jättegrenen^[15] Den har en massa som är lika med ca 2,1^[7] solmassor, en radie som är ca 60^[8] solradier och utsänder energi från dess fotosfär motsvarande ca 600 gånger solen^[9] vid en effektiv temperatur av ca 3 900 K.^[7]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, HD 104555, 6 juni 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°. 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. eISSN 1562-6873. 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. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
^ [a b c] 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] 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.
^ 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, B. A., Uranometria Argentina, Reprinted and updated by Pilcher, F, archived from the original on 2012-02-27, hämtad 2012-01-06
^ HR 7812 (unistra.fr). Hämtad 2023-09-17.
^ "HR 7812". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 28 juli 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.
^ Gaia Collaboration; et al. (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

Externa länkar

https://www.universeguide.com/star/101843/hd194612

[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.

[D-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°. Bibcode:1975mcts.book.....H.

[E-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.

[F-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. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.

[G-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. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.

[H-7] [a b c] 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-8] [a b c] 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.

[J-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.

[K-10] 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-11] Gould, B. A., Uranometria Argentina, Reprinted and updated by Pilcher, F, archived from the original on 2012-02-27, hämtad 2012-01-06

[SIMBAD-12] HR 7812 (unistra.fr). Hämtad 2023-09-17.

[M-13] "HR 7812". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 28 juli 2022.

[N-14] 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.

[C-15] Gaia Collaboration; et al. (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

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Observationsdata Epok: J2000.0
HD 194612

Stjärnbild	Oktanten
Rektascension	20^t 38^m 18,6064^s^[1]
Deklination	-81° 17′ 20,6261 ″^[1]
Skenbar magnitud ( $V$ )	5,89 ± 0,01^[2]
Stjärntyp
Spektraltyp	K5 III^[3]
U–B	+2,02^[4]
B–V	+1,71^[4]
Astrometri
Radialhastighet ( $R_{v}$ )	+0,3 ± 0,4^[5] km/s
Egenrörelse (µ)	RA: +1,597^[1] mas/år Dek.: -37,819^[1] mas/år
Parallax ( $\pi$ )	4,3006 ± 0,0707^[1]
Avstånd	760 ± 10 lå (233 ± 4 pc)
Absolut magnitud ( $M_{V}$ )	-0,56^[6]
Detaljer
Massa	2,1^[7] M_☉
Radie	59,9^[8] R_☉
Luminositet	598 ± 13^[9] L_☉
Temperatur	3 941 ± 122^[8] K
Vinkelhastighet	2,3 ± 1,2^[10] km/s
Andra beteckningar
49 G. Octantis,^[11] HD 194612, CPD-81 906, GSC 09472-00923, HIC 101843, HIP 101843, HR 7812, IRAS 20300-8127, 2MASS J20381867-8117206, PPM 378486, SAO 258864, TYC 9472-923-1, Gaia DR2 6349168274420273280, Gaia DR3 6349168278717707008^[12]^[13]

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