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 och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 134,5 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. och kommer att ligga inom ett avstånd av 20 ljusår om ca 32 000 år. Den har en relativt stor egenrörelse av 1,4 bågsekunder per år över himlavalvet.

Egenskaper

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

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.

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

Referenser

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

Noter

1 2 3 4 5 6 7 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.
1 2 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M.
1 2 3 4 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
1 2 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.
1 2 3 4 5 6 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
1 2 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

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

[A-1] 1 2 3 4 5 6 7 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] 1 2 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] 1 2 3 4 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] 1 2 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] 1 2 3 4 5 6 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] 1 2 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.