Astronomy Principles and Practice Fourth Edition.pdf

Answers to problems 465
5.
Maximum
Minimum
Right ascension June 21st December 21st
Declination N September 21st March 21st
7. Displacement in celestial longitude =−21·′′ 81; in celestial latitude = 0
8. 1448 years
9. The star lies on the great circle arc joining the zenith to the ecliptic point A which is 90 ◦ behind
the Sun such that
k tan z = κ sin θ
where θ is the angle between the star and A. z = 18 ◦ 24 ′
10. 6 h
11. 43 ◦ N; 47 ◦
12. 6859 years hence
13. 50·′′ 70 per annum; 0·0143 day
14. (i) λ = 330 ◦ ; b = 66 1 2 ◦ N (ii) α = 302 ◦ 14 ′ ; δ = 49 ◦ 36 ′ N
15. 48 1 2 N; 90◦ ; 4189 years hence
Chapter 12
1. Superior
2. 115·9days
3. 46 ◦ 18 ′
4. 4330 days
5. 23 ◦ 34 ′
6. 5·483
7. 0·8821
8. 1·291
9. 0·6395 AU; 0·9457
10. (i) 38 ◦ 46 ′ ; (ii) 97·3 days
11. 120·6days
12. 0·0976
13. (NB: 1968 is a Leap Year) Aug 28th; Mar 14th; 1978; Every 12th year
Chapter 13
1. 8 years
2. 0·6151 year
3. 1·524 AU
4. 1/1060
5. 0·0316 year
6. 341 000
7. 6200 km
8. 2078 km; 0·1251; 79·1/1
9. 2·081 days (Hint: Use the first approximation to the binomial theorem)
10. (i) 0·382 AU; (ii) 1·205; (iii) 5·59 AU year −1
11. (i) 60·16; (ii) 3619