Whirlpool Galaxy Shines Brightly Tonight
Stargazers have a fantastic opportunity to observe the Whirlpool Galaxy, also known as M51, and its companion galaxy tonight. The optimal viewing time is before the Moon rises, providing ideal conditions for appreciating this celestial marvel.
Locating the Galaxies
Shortly after sunset, the constellation Canes Venatici will be high in the west. It resides beneath Ursa Major’s curve, which constitutes the Big Dipper’s handle. M51 is in northern Canes Venatici, just 3.5 degrees southwest of Alkaid. Alkaid, or Eta (η) Ursae Majoris, is the star at the Big Dipper’s handle end.
The Whirlpool is a face-on spiral galaxy showcasing its bright core and winding arms. It shines at magnitude 8.4, making it visible in smaller scopes as a circular glow that brightens towards the center. Larger telescopes are ideal for capturing greater detail, resolving its spiral arms from about 31 million light-years distant.
Companion Galaxy
You’ll observe a smaller, vibrant object north of the galaxy. This is M51’s companion, NGC 5195. It is thought that NGC 5195 is passing behind M51. The interaction of these galaxies has increased the spiral structure of the Whirlpool.
Sky Highlights
With a waning gibbous Moon (81% illuminated), tonight’s sky offers some compelling features. The times for sunrise, sunset, moonrise, and moonset are provided for a location at 40° N 90° W.
Celestial Timetable
- Sunrise: 5:31 A.M.
- Sunset: 8:31 P.M.
- Moonrise: —
- Moonset: 9:27 A.M.
- Moon Phase: Waning gibbous (81%)
For more on upcoming celestial events, further details are available in the “Sky This Week” column.
