Where in the night sky can you observe the famous double star system Mizar and Alcor?
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Where in the night sky can you observe the famous double star system Mizar and Alcor?
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- What is the parallax angle of a star that is 50 pc away? enter your answer in arc secondsSuppose that two stars in a binary star system are separated by a distance of 80 million kilometers and are located at a distance of 160 light years from earth. What is the angular separation of the two stars? Give your answer in arcsecondshow is the rotation curve method related to binary stars and Kepler’s third law?
- A planet is detected at 0.5" from its star. The star is 10 parsecs away. How many AU from its star is the planet?The stars in a CCD image include stars in a cluster and stars in front of the cluster (i.e. starts that don't belong to it). One group has parallaxes clustered around of 3 milli-seconds of arc (or "3 mas"). The parallaxes of the other group range from 10 mas to 15 mas. Which group contains the stars in the cluster? Explain your answer.Listed below are several fictional stars with their luminosities and distances from Earth given. Rank the stars based on how bright each would appear in the sky as seen from Earth, from brightest to dimmest. using the formula Lumionisty/4πd^2 A) Q-bert: L=400Lsun, d=40ly B) Frogger: L=400Lsun, d=20ly C) Centipede: L=200Lsun, d=10ly D) Galaga: L=100Lsun, d=8ly E) Pacman: L=200Lsun, d=20ly
- Which star in the HR diagram below will no longer exist in 1 Billion years? 60 Mun 10⁰ 10⁰ 10 10² 10⁰ 10 10 10 10 30 M 10 Solar Radi Lifetime 10 yrs 0.1 Solar Radius 10 Solar Radus O Centauri 30,000 10M Sirius B MAIN Bellatrix Lifetime 10 B Rigal Deneb 6M MA Achemar SEQUENCE 18yrs WHITE SUPERGIANTS Canopus Vega 10 Soler Radi Procyon B 10,000 Srius Lifetime 10 DWARFS Alar Arcturus Procyon eyon Polaris 5 Mun Liteting 10 yrs SIM 7 Cet AFG 6,000 GIANTS Centauri A Pollux Centaur B Eridani Aldebaran K Artares 61 Cyani A Betelgeuse Barnard's Star 61 Cygni B Lacalle 9352 0.3M Gliese 725 A Gliese 725 B Ross 128 Wolf 359, Proxima Centauri M DX Cancri 3.000Imagine that the Earth is orbiting a white dwarf star, whose surface temperature is 20000 K. What is the apparent angular size of this white dwarf as viewed from Earth? (Express your answer in arcseconds)As seen from earth the sun has an apparent magnitude and of about -26.7 what is the apparent magnitude of the sun as eeen from Saturn about 10AU away?