Use the small angle equation to find the angular diameter of Sgr A* if it has a diameter of 13 AU and a distance of 8.5 kpc.
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- Venus can be as bright as apparent magnitude -4.7 when at a distance of about 1 AU. How many times fainter would Venus look from a distance of 5 pc? Assume Venus has the same illumination phase from your new vantage point. (Hints: Recall the inverse square law; also, review the definition of apparent visual magnitudes. ote: 1 pc = 2.1 x 10° AU). times fainter What would its apparent magnitude be? Need Help? Read ItA star orbiting Sagittarius A* is orbiting 970 AU from a 4 million MSun object. How fast (in km/s) is the star orbiting? (Assume the orbit is approximately circular.)Venus can be as bright as apparent magnitude −4.7 when at a distance of about 1 AU. How many times fainter would Venus look from a distance of 7 pc? Assume Venus has the same illumination phase from your new vantage point. (Hints: Recall the inverse square law; also, review the definition of apparent visual magnitudes. Note: 1 pc = 2.1 ✕ 105 AU). [fill in the blank] times fainter What would its apparent magnitude be?
- We observe a star that is dstar away. How much extinction would there need to be (i.e., what must tau(τ) be) if we had ignored intervening dust, and concluded that it was actually 2*dstar away? Value: dstar = 850 pcLet's assume it took Voyager 1 13 years to reach the edge of solar system at a distance of 40 AU. How fast was voyager 1 traveling in Km/hr?At rest carbon emits a spectral line at 364.0 nm. If this line is observed at 410.0 nm from exoplanet host Helvetio's, how fast is Helvitios moving toward or away from us in km/s?
- What evidence is there that star formation has occurred recently?why do dark streaks appear in visible light images of the Trifid nebula, but appear bright in an infared imageImagine a trans-Neptunian object with roughly the same mass as Earth but located 50 AU from the sun. a) based on the solar nebula theory, what do you think this object would be made of and why? b) on the basis of speculation, assume a reasonable density for this object and calculate its diameter in units of Earth radii.