78 Cancri

78 Cancri
Observationsdata
Epok: J2000.0
StjärnbildKräftan
Rektascension09t 09m 02,31165s[1]
Deklination+17° 28′ 10,7518″[1]
Skenbar magnitud ()+7,19 (V)[2]
Stjärntyp
SpektraltypK3 III[2]
B–V+1,207 ± 0,008[2]
Astrometri
Radialhastighet ()+77,70[1] km/s
Egenrörelse (µ)RA: -38,419[1] mas/år
Dek.: -32,292[1] mas/år
Parallax ()5,9540 ± 0,0572[1]
Avstånd548 ± 5 lå (168 ± 2 pc)
Absolut magnitud ()0,56[2]
Detaljer
Massa1,62[3] M☉
Radie10,92+0,50-0,94[1] R☉
Luminositet47,6 ± 0,6[1] L☉
Temperatur4 587+213-101[1] K
Ålder2,91[3] miljarder år
Andra beteckningar
78 Cnc, AG+17 995, BD+18 2129, GSC 01401-00384, HD 78479, HIC 44918, HIP 44918, IRAS 09062+1740, 2MASS J09090231+1728109, PPM 126148, SAO 98389, TYC 1401-384-1, uvby98 100078479, Gaia DR2 635095890642370560, Gaia DR1 635095886346816384 [4]

78 Cancri, som är stjärnans Flamsteed-beteckning, är en ensam stjärna, belägen i den mellersta delen av stjärnbilden Kräftan. Den har en skenbar magnitud av ca 7,19[2] och kräver åtminstone en handkikare för att kunna observeras. Baserat på parallax enligt Gaia Data Release 2 på ca 6,0[1] mas, beräknas den befinna sig på ett avstånd på ca 548 ljusår (ca 168 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 78 km/s.[1]

Egenskaper

78 Cancri är en orange till gul jättestjärna av spektralklass K3 III.[2] Den har en massa som är ca 1,6[3] solmassor, en radie som är ca 11[1] solradier och utsänder från dess fotosfär ca 48[1] gånger mera energi än solen vid en effektiv temperatur av ca 4 600[2] K.

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, 78 Cancri, 29 mars 2020.

Noter

  1. ^ [a b c d e f g h i j k l m] 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.
  2. ^ [a b c d e f g] Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  3. ^ [a b c] Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88.
  4. ^ "78 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2020-03-29.

Externa länkar

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Stjärnor i Kräftan
Bayer
Flamsteed
Variabler
R Cancri  · S Cancri  · T Cancri  · U Cancri  · V Cancri  · W Cancri  · X Cancri  · Y Cancri  · Z Cancri  · AZ Cancri  · VZ Cancri  · DX Cancri  · EI Cancri  · HM Cancri
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