The star Sirius has an apparent magnitude ?V = −1.46 and a parallax ? = 0.37921”.(a) Calculate its distance and absolute magnitude. (b) What would Sirius’ parallax be if it were measured from an observatory on Neptune’s moon Triton as Neptune orbited theSun?
Answer:
b) Neptune orbits the Sun at a distance of 30 AU.
And the base of the parallax triangle is 30 times as large as that from the Earth.
Hence, the parallax angle is also 30 times as large.
Spica's parallax from Earth is
12.44 x 10^-3 arcsec,
corresponding to a distance is about 80 pc.
Thus
From Triton the parallax is
= 30x12.44 x 10^-3
= 0.3732 arcsec
The star Sirius has an apparent magnitude ?V = −1.46 and a parallax ? = 0.37921”.(a)...
1) If a star has an apparent magnitude of -0.4 and a parallax of 0.3”, what is a) the distance modulus and b) the absolute magnitude?
9) How distant is a star whose modulus is -7.5? 10) If its apparent magnitude (m) = +13.5 and absolute magnitude (M) = +10, what is the distance to a star? PROBLEMS TO COMPLETE FOR PARALLAX 11) A star has a parallax of .025 seconds of arc—what is its distance in parsecs? The nearest star has a parallax of 76 arc seconds—what is its distance in light years? 12) If star were 2.40 pc from Earth, what would its distance...
Question 1. A star has a parallax 0.043 arcsec and an apparent magnitude m = 7.8. Calculate its distance (parsec) and luminosity. Express the luminosity in watts and as a percentage of the solar luminosity.
Question 2. The supergiant star Rigel has a parallax 3.78 mas, apparent magnitude m = 0.1, and surface temperature T = 12,100 K. Calculate its: distance [parsec] luminosity [solar units], radius [solar radii]
What is the parallax in arcseconds of a star that is 4.7 parsecs away? Express your answer to 2 significant figures. parallax: arcseconds The star Spica has an apparent magnitude of 1.04 and is located 80.0 parsecs away. What is Spica's absolute magnitude? Express your answer to 3 significant figures. absolute magnitude:
htness is distance-dependent. The brighter star may not actually e. We need to correct for the distance so that we can actually r s. If you know the apparent magnitude and the parallax (distance number to the absolute magnitude scale. The absolute magnit what the magnitude of the star would be if it was located at 10 p Absolute magnitude Apparent magnitude+ 5+5 x log(paralla Convert these apparent magnitudes to absolute magnitudes. Apparent Magnitude 1.0.o Parallax 0.32" 0.012" Absolute Magnitude
Magnitude and distance modulus a) What is the absolute magnitude and distance modulus for each of the following stars: i)m=+5.0, d=200 pc ii) m=-3.5, d=7 pc iii) m=+6.8, p=0.003" (p is the parallax angle) b) The Sun has an apparent magnitude of -26.8. Calculate i)its absolute magnitude. ii) the apparent magnitude it would have at the distance of a Centauri (1.3 pc). iii) the apparent magnitude it would have if it were 2 kpc away.
If you can measure the apparent magnitude of a star and known the absolute magnitude of that type of star (e.g. RR Lyrae or Cepheids, then what can you determine distance temperature radius semi-major axis distance
correct? 16. The star Sinbad 7 has an apparent magnitude of 4.73 and an absolute magnitude of 4.73. Determine the distance to Sinbad 7 in parsecs. 2 points O A 17.25 pc O B. 4.73 pc C. 10.0 pc O D. 23.7 pc O E. Cannot be determined without knowing the spectral type.
The Hipparcos satellite, which has given us most of our best modern measurements of parallax, has an uncertainty in its measurements of the parallax angle of 0.001". For a star with a parallax of 0.004" what is the distance to the star? What is the uncertainty in that distance? What is the percentage uncertainty? At what distance is the distance uncertainty 10% The Hipparcos satellite, which has given us most of our best modern measurements of parallax, has an uncertainty...