HD 4628

	HD 4628
Observationsdata; Epok: J2000.0
Stjärnbild	Fiskarna
Rektascension	00t 48m 22,97634 s
Deklination	+05° 16′ 50,2096 ″
Skenbar magnitud ()	+5,74 (V)
Stjärntyp
Spektraltyp	K2.5 V
U–B	+0,60
B–V	+0,89
Astrometri
Radialhastighet ()	-10,41 ± 0,15 km/s
Egenrörelse (µ)	RA: +755,561 mas/år; Dek.: -1 141,745 mas/år
Parallax ()	134,4948 ± 0,0578
Avstånd	24,25 ± 0,01 lå (7,435 ± 0,003 pc)
Absolut magnitud ()	+6,37
Detaljer
Massa	0,70 ± 0,19 M☉
Radie	0,749 ± 0,05 R☉
Luminositet	0,28 L☉
Temperatur	5 055 ± 40 K
Metallicitet	-0,22 (Fe/H) dex
Ålder	5,4 miljarder år
Andra beteckningar
	96 G Piscium, LHS 121, AG+05 87, BD+04 123, CCDM J00483+0516A, EUVE J0048+05.3, EUVE J0048+05.2, FK5 1019, GJ 33, HD 4628, HIC 3765, HIP 3765, HR 222, IRAS 00457+0500, LSPM J0048+0516, 2MASS J00482303+0516497, NLTT 2668, PLX 156, PPM 143910, 1RXS J004822.3+051729, SAO 109471, TD1 447, TYC 17-1398-1, USNO-B1.0 0952-00007478, uvby98 100004628, WDS J00484+0517A, WISEA J004823.57+051638.1, Gaia DR2 2552925644460225152

HD 4628 är en ensam stjärna i den södra delen av stjärnbilden Fiskarna som också har Bayer-beteckningen 96 G Piscium. 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 2 på ca 134,5^[4] mas, beräknas den befinna sig på ett avstånd på ca 24 ljusår (ca 7,4 parsek) från solen. Den rör sig närmare solen med en heliocentrisk radialhastighet på ca -10 km/s.^[1] och kommer att ligga inom ett avstånd av 20 ljusår om ca 32 000 år.^[13] Den har en relativt stor egenrörelse av 1,4 bågsekunder per år över himlavalvet.^[1]

Egenskaper redigera

HD 4628 är en solliknande orange till gul stjärna i huvudserien av spektralklass K2.5 V.^[3] Den har en massa som är ca 0,7^[6] solmassor, en radie som är ca 0,75^[7] solradier och har ca 0,28 gånger solens utstrålning av energi^[6] från dess fotosfär vid en effektiv temperatur av ca 5 100 K.^[6]

HD 4628 har en relativt låg ytaktivitet och, baserat på mätning av UV-strålning, bedöms den ha en relativt sval korona med en temperatur av en miljon K.^[14]

Ingen följeslagare har ännu (2021) observerats i omlopp kring stjärnan. År 1958 antogs den ha en följeslagare, som var flarestjärna, men detta dementerades senare.^[15]

Referenser redigera

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, HD 4628, 30 december 2021.

Noter redigera

^ [a b c d e f g] 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] Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M.
^ [a b c d] Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992
^ [a b] 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. Gaia EDR3 record for this source at VizieR.
^ Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191, S2CID 118577511.
^ [a b c d e f] Ghezzi, L.; et al. (September 2010), "Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity", The Astrophysical Journal, 720 (2): 1290–1302, arXiv:1007.2681, Bibcode:2010ApJ...720.1290G, doi:10.1088/0004-637X/720/2/1290, S2CID 118565025
^ [a b] van Belle, Gerard T.; von Braun, Kaspar (2009). "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars". The Astrophysical Journal. 694 (2): 1085–1098. arXiv:0901.1206. Bibcode:2009ApJ...694.1085V. doi:10.1088/0004-637X/694/2/1085. S2CID 18370219.
^ Maldonado, J.; et al. (October 2010), "A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups", Astronomy and Astrophysics, 521: A12, arXiv:1007.1132, Bibcode:2010A&A...521A..12M, doi:10.1051/0004-6361/201014948, S2CID 119209183
^ Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008), "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics", The Astrophysical Journal, 687 (2): 1264–1293, arXiv:0807.1686, Bibcode:2008ApJ...687.1264M, doi:10.1086/591785, S2CID 27151456
^ Gould, B. A., Uranometria Argentina, Reprinted and updated by Pilcher, F, archived from the original on 2012-02-27, hämtad 2010-07-16
^ HD 4628 (u-strasbg.fr)|Hämtad 2022-01-23.
^ "HD 4628 -- High proper-motion Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, hämtad 2016-07-15.
^ Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics, 575: 13, arXiv:1412.3648, Bibcode:2015A&A...575A..35B, doi:10.1051/0004-6361/201425221, S2CID 59039482, A35.
^ Mathioudakis, M.; et al. (November 1994), "Detection of EUV emission from the low activity dwarf HD 4628: Evidence for a cool corona", Astronomy and Astrophysics, 291 (2): 517–520, Bibcode:1994A&A...291..517M.
^ Hartkopf, W. I.; McAlister, H. A. (January 1984), "Binary stars unresolved by speckle interferometry. III", Publications of the Astronomical Society of the Pacific, 96: 105–116, Bibcode:1984PASP...96..105H, doi:10.1086/131309.

Externa länkar redigera

https://www.universeguide.com/star/3765/96gpiscium.

[A-1] [a b c d e f g] 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.

[B-2] [a b] Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M.

[C-3] [a b c d] Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992

[D-4] [a b] 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. Gaia EDR3 record for this source at VizieR.

[E-5] Holmberg, J.; et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics, 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191, S2CID 118577511.

[F-6] [a b c d e f] Ghezzi, L.; et al. (September 2010), "Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity", The Astrophysical Journal, 720 (2): 1290–1302, arXiv:1007.2681, Bibcode:2010ApJ...720.1290G, doi:10.1088/0004-637X/720/2/1290, S2CID 118565025

[G-7] [a b] van Belle, Gerard T.; von Braun, Kaspar (2009). "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars". The Astrophysical Journal. 694 (2): 1085–1098. arXiv:0901.1206. Bibcode:2009ApJ...694.1085V. doi:10.1088/0004-637X/694/2/1085. S2CID 18370219.

[H-8] Maldonado, J.; et al. (October 2010), "A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups", Astronomy and Astrophysics, 521: A12, arXiv:1007.1132, Bibcode:2010A&A...521A..12M, doi:10.1051/0004-6361/201014948, S2CID 119209183

[I-9] Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008), "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics", The Astrophysical Journal, 687 (2): 1264–1293, arXiv:0807.1686, Bibcode:2008ApJ...687.1264M, doi:10.1086/591785, S2CID 27151456

[J-10] Gould, B. A., Uranometria Argentina, Reprinted and updated by Pilcher, F, archived from the original on 2012-02-27, hämtad 2010-07-16

[SIMBAD-11] HD 4628 (u-strasbg.fr)|Hämtad 2022-01-23.

[K-12] "HD 4628 -- High proper-motion Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, hämtad 2016-07-15.

[M-13] Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics, 575: 13, arXiv:1412.3648, Bibcode:2015A&A...575A..35B, doi:10.1051/0004-6361/201425221, S2CID 59039482, A35.

[L-14] Mathioudakis, M.; et al. (November 1994), "Detection of EUV emission from the low activity dwarf HD 4628: Evidence for a cool corona", Astronomy and Astrophysics, 291 (2): 517–520, Bibcode:1994A&A...291..517M.

[N-15] Hartkopf, W. I.; McAlister, H. A. (January 1984), "Binary stars unresolved by speckle interferometry. III", Publications of the Astronomical Society of the Pacific, 96: 105–116, Bibcode:1984PASP...96..105H, doi:10.1086/131309.

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Observationsdata Epok: J2000.0
HD 4628

Stjärnbild	Fiskarna
Rektascension	00^t 48^m 22,97634 ^s^[1]
Deklination	+05° 16′ 50,2096 ″^[1]
Skenbar magnitud ( $V$ )	+5,74 (V)^[2]
Stjärntyp
Spektraltyp	K2.5 V^[3]
U–B	+0,60^[3]
B–V	+0,89^[3]
Astrometri
Radialhastighet ( $R_{v}$ )	-10,41 ± 0,15^[1] km/s
Egenrörelse (µ)	RA: +755,561^[1] mas/år Dek.: -1 141,745^[1] mas/år
Parallax ( $\pi$ )	134,4948 ± 0,0578^[4]
Avstånd	24,25 ± 0,01 lå (7,435 ± 0,003 pc)
Absolut magnitud ( $M_{V}$ )	+6,37^[5]
Detaljer
Massa	0,70 ± 0,19^[6] M_☉
Radie	0,749 ± 0,05^[7] R_☉
Luminositet	0,28^[6] L_☉
Temperatur	5 055 ± 40^[6] K
Metallicitet	-0,22 (Fe/H) ^[8] dex
Ålder	5,4^[9] miljarder år
Andra beteckningar
96 G Piscium,^[10] LHS 121, AG+05 87, BD+04 123, CCDM J00483+0516A, EUVE J0048+05.3, EUVE J0048+05.2, FK5 1019, GJ 33, HD 4628, HIC 3765, HIP 3765, HR 222, IRAS 00457+0500, LSPM J0048+0516, 2MASS J00482303+0516497, NLTT 2668, PLX 156, PPM 143910, 1RXS J004822.3+051729, SAO 109471, TD1 447, TYC 17-1398-1, USNO-B1.0 0952-00007478, uvby98 100004628, WDS J00484+0517A, WISEA J004823.57+051638.1, Gaia DR2 2552925644460225152 ^[11]^[12]