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Question 17N.3.SL.TZ0.11b.ii

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Date November 2017 Marks available [Maximum mark: 2] Reference code 17N.3.SL.TZ0.11b.ii
Level SL Paper 3 Time zone TZ0
Command term Outline Question number b.ii Adapted from N/A
b.ii.
[Maximum mark: 2]
17N.3.SL.TZ0.11b.ii

Two of the brightest objects in the night sky are the planet Jupiter and the star Vega.
The light observed from Jupiter has a similar brightness to that received from Vega.

Vega is found in the constellation Lyra. The stellar parallax angle of Vega is about 0.13 arc sec.

(b.ii)

Outline how the stellar parallax angle is measured.

[2]

Markscheme

the star’s position is observed at two times, six months apart, relative to distant stars

parallax angle is half the angle of shift

Answers may be given in diagram form, so allow the marking points if clearly drawn

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