The Sky This Month: April 2003

Upcoming Events:
 
April 16 Wed Mercury at greatest elongation east
April 16 Wed Full Moon
April 22 Tue Lyrid meteors peak
April 23 Wed Mars 3° N of Moon
April 23 Wed Third quarter Moon
April 28 Mon Venus 3° N of Moon
May 1 Thu New Moon
May 3 Sat Asteroid Juno at opposition
May 5 Mon Saturn 3° S of Moon
May 5 Mon h-Aquarid meteors peak
May 7 Wed Mercury transits Sun at sunrise
May 8 Thu Jupiter 4° S of Moon
May 9 Fri First quarter Moon
May 10 Sat Astronomy Day
May 10 Sat Mars reaches 10" diameter
May 15 Thu Full Moon: total lunar eclipse

Ursa Major:

Double stars:
 
Star Magnitude Separation Position Angle
z Zeta: Mizar and Alcor 2.3, 4.0, 4.0 14.4", 709" 152°, 71°
x Xi: Alula Australis 4.3, 4.8 1.8" 273°
Winnecke 4 (Messier 40) 9.0, 9.3 50" 85°

Variables:
 
Name Type Range Per Charts
Z UMa Semireg 6.4-9.3 196d http://www.aavso.org/charts/UMA/Z_UMA/ZUMA-A.GIF
http://www.aavso.org/charts/UMA/Z_UMA/ZUMA-B.GIF
S UMa Mira 7.8-11.7 226d http://www.aavso.org/charts/UMA/S_UMA/SUMA-B.GIF
http://www.aavso.org/charts/UMA/S_UMA/SUMA-D.GIF

Deep sky objects:
 
Object Type Magnitude Surface brightness
Messier 81 Galaxy 6.9 13.0
Messier 82 Galaxy 8.4 12.8
Messier 108 Galaxy 10.0 13.0
Messier 97 Planetary nebula 9.9 12.1
Messier 109 Galaxy 9.8 13.5
Messier 101 Galaxy 7.9 14.8
Messier 51 CVn Galaxy 8.4 12.6