HD 7977

HD 7977
Megfigyelési adatok
CsillagképCassiopeia
Rektaszcenzió01h 20m 31.596s
Deklináció+61° 52′ 57.01″
Távolság246.9 ± 0.6 fé,
75.7 ± 0.2 pc
Látszólagos fényesség9.04
Színkép típusaG3
Pályaadatok
Évi parallaxis13,203 milliívmásodperc
Radiális sebesség26,45 km/s
Sajátmozgás
rektaszcenzióban0,559 mas/év
deklinációban0,014 mas/év
Fizikai adatok
Sugár1.09 R☉
Tömeg1.07 M☉
Felszíni gravitáció4.35 cgs
Hőmérséklet
Felszín5,816 K
Luminozitás1.20 L☉

A HD 7977 (más ismert nevein TYC 4034-1077-1 vagy USNO-A2 1500-01356484) egy G-típusú fősorozati csillag a Cassiopeia csillagképben, a Földtől kb. 247 fényévnyire. A HD 7977 arról ismert, hogy 2,8 millió évvel ezelőtt nagyon közel haladt el a Naprendszerhez,[1] ami valószínűleg elég közel volt ahhoz, hogy mélyen behatoljon az Oort-felhőbe. Ezzel felzavarta az ott található objektumokat és üstökösöket, megindítva azokat a Naprendszer felé.[2] Egyes kutatások szerint gravitációja hatással lehetett a Naprendszer külső bolygóira, amelyet aztán továbbadták azt a belső bolygóknak, így a Földnek is, amelynek ettől megváltozott a pályája, és ez közvetetten oka lehetett a jégkorszaknak is.[3]

Forráshivatkozások

  1. ↑ Guide, Universe: HD 7977 Star Facts (Type, Distance, Age, Colour, Location and more) - Universe Guide (amerikai angol nyelven). www.universeguide.com, 2019. december 14. (Hozzáférés: 2024. június 24.)
  2. ↑ Bobylev, V. V. (2022. szeptember 1.). „Search for Close Stellar Encounters with the Solar System Based on Data from the Gaia DR3 Catalogue” (angol nyelven). Astronomy Letters 48 (9), 542–549. o. DOI:10.1134/S1063773722080011. ISSN 1562-6873. 
  3. ↑ Passing Stars Altered Orbital Changes in Earth, Other Planets (amerikai angol nyelven). Planetary Science Institute, 2024. február 14. (Hozzáférés: 2024. június 24.)

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