Local Standard of Rest

Local Standard of Rest

Das lokale Ruhesystem (engl.: Local Standard of Rest, kurz LSR) beschreibt in der Astronomie ein fiktives Bezugssystem, dessen Ursprung am gegenwärtigen Ort der Sonne gewählt wird. Dieser Punkt bewegt sich mit der mittleren Geschwindigkeit der Sterne in der Sonnenumgebung weiter und vollführt dabei eine perfekte Kreisbewegung in der Galaxienscheibe um das Zentrum unserer Galaxie. Da die Sonne für eine Umdrehung 2,3×108 Jahre benötigt, ist der bei dieser Annahme entstehende systematische Fehler auf kleinen Zeitskalen vernachlässigbar.

Anwendung

Das lokale Ruhesystem ist nützlich bei der Untersuchung der Bewegung von Objekten in unserer Milchstraße und der Struktur der Milchstraße. Auf das lokale Ruhesystem bezogene Bewegungen sind von den überlagerten Effekten der Eigenbewegung der Sonne relativ zu ihrer Nachbarschaft frei.

Relativ zum lokalen Ruhesystem bewegt sich die Sonne mit etwa 20 km/s Geschwindigkeit in Richtung des Sternbilds Herkules.


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