Possible webpage title: Need Help with These Astronomy Questions?

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  • Thread starter Thread starter SilverHammer
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SUMMARY

The discussion centers on homework questions related to the star 51 Pegasi, specifically its physical characteristics and orbital dynamics. Key details include its spectral class G2 V, temperature of approximately 5800 K, distance of 50 light-years, and a planet with a mass of 150 Earth masses orbiting at a semi-major axis of 0.052 AU. The questions posed involve calculating the angular size of the planet's orbital diameter, determining the wavelength and frequency of the star's black body radiation, finding the star's parallax, apparent magnitude, and sidereal time on a specific date.

PREREQUISITES
  • Understanding of basic astronomy concepts, including stellar classification and black body radiation.
  • Familiarity with angular measurements and parallax calculations.
  • Knowledge of apparent and absolute magnitude in astronomy.
  • Basic grasp of sidereal time and its calculation.
NEXT STEPS
  • Learn how to calculate angular size in astronomy, focusing on arc seconds.
  • Study black body radiation and its relationship to temperature, including Wien's Law.
  • Research methods for calculating stellar parallax and its significance in distance measurement.
  • Explore the concepts of apparent and absolute magnitude, including their formulas and applications.
USEFUL FOR

Astronomy students, educators, and anyone interested in understanding stellar properties and orbital mechanics will benefit from this discussion.

SilverHammer
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Can someone help me understand some homework questions? I'm stuck on these last 5 out of 30.

The star Pegasi (RA = 22h 57m, Dec.=+20.75) is of spectral class G2 V (temperature of around 5800 K). It's distance is 50 ly from us and has a planet (150 Earth masses) orbiting it with a semi-major axis of 0.052 AU. The star is about 1 solar mass, and its luminosity is about 1.3 times that of the sun and absolute magnitude of about 4.0

Okay, on to the questions I'm not understanding.

1) How do I determine the angular size of the planet's orbital diameter (Arc seconds)?
2) What is the wavelength and frequency of the peak in 51 Pegasi's black body curve and what radiation is it?
3) What's the star's parallax?
4) What's the star's apparent magnitude
5)What is the sidereal time on March 7 at 4:00 pm?

I'd appreciate it if someone had time to explain!
 
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