Possible webpage title: Need Help with These Astronomy Questions?

  • Thread starter Thread starter SilverHammer
  • Start date Start date
AI Thread Summary
The discussion centers on a user seeking assistance with five specific astronomy homework questions related to the star Pegasi. Key inquiries include calculating the angular size of the planet's orbital diameter in arc seconds, determining the wavelength and frequency of the star's black body radiation, finding the star's parallax, its apparent magnitude, and the sidereal time for a specific date and time. The user provides detailed information about Pegasi, including its spectral class, distance, and characteristics. Additional resources for homework help are suggested, emphasizing the availability of specialized forums for such inquiries. Engaging with these resources could provide the necessary support for understanding these astronomy concepts.
SilverHammer
Messages
1
Reaction score
0
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!
 
Astronomy news on Phys.org
Last edited:

Thread 'Potential biosignature found in Mars rock'

Publication: Redox-driven mineral and organic associations in Jezero Crater, Mars Article: NASA Says Mars Rover Discovered Potential Biosignature Last Year Press conference The ~100 authors don't find a good way this could have formed without life, but also can't rule it out. Now that they have shared their findings with the larger community someone else might find an explanation - or maybe it was actually made by life.
View full post »

Thread 'Does it make sense to build new radio telescopes?'

TL;DR Summary: In 3 years, the Square Kilometre Array (SKA) telescope (or rather, a system of telescopes) should be put into operation. In case of failure to detect alien signals, it will further expand the radius of the so-called silence (or rather, radio silence) of the Universe. Is there any sense in this or is blissful ignorance better? In 3 years, the Square Kilometre Array (SKA) telescope (or rather, a system of telescopes) should be put into operation. In case of failure to detect...
View full post »
Thread 'Could gamma-ray bursts have an intragalactic origin?'

Thread 'Could gamma-ray bursts have an intragalactic origin?'

This is indirectly evidenced by a map of the distribution of gamma-ray bursts in the night sky, made in the form of an elongated globe. And also the weakening of gamma radiation by the disk and the center of the Milky Way, which leads to anisotropy in the possibilities of observing gamma-ray bursts. My line of reasoning is as follows: 1. Gamma radiation should be absorbed to some extent by dust and other components of the interstellar medium. As a result, with an extragalactic origin, fewer...
View full post »

Similar threads

I New Developments In The Search For Planet X
Replies
2
Views
3K
Simple Astronomy questions - Need
Replies
8
Views
5K
Astronomy Problems: Help Solve Now!
Replies
1
Views
3K
A possible super-Earth or Brown Dwarf in our Solar System
Replies
12
Views
4K
A question about the flatness of galaxies
Replies
17
Views
3K
Structure of the Galaxy: 6 Questions Confirmed
Replies
31
Views
4K
Is my fictional Solar System stable and realistic?
Replies
21
Views
4K
Some questions about glob. clusters and dark matter
Replies
3
Views
3K
What is GJ 1214 b: A Super-Earth Water World Orbiting a Red Dwarf Star?
Replies
1
Views
7K
Orbital Mechanics Question - Speculative
Replies
8
Views
4K

Hot Threads

Recent Insights

Back
Top