Bootes Constellation
Boötes (The Herdsman)
Boötes, pronounced "boh-OH-teez," is a prominent constellation in the northern sky. Its name means "herdsman" or "plowman" in Greek, and it is often depicted as a figure driving oxen and plowing the heavens. Boötes is best known for its bright star Arcturus, one of the brightest stars in the night sky. The constellation is visible in the spring and early summer months in the Northern Hemisphere.
Key Features
- Bright Stars: Boötes contains several notable stars:
- Arcturus (Alpha Boötis): The brightest star in Boötes and the fourth-brightest star in the night sky. It is an orange giant located about 37 light-years away.
- Izar (Epsilon Boötis): A beautiful binary star system with contrasting colors of orange and blue, often referred to as the "Pulcherrima," meaning "most beautiful."
- Nekkar (Beta Boötis): A yellow giant star marking the head of the herdsman, located approximately 219 light-years away.
- Deep-Sky Objects: While Boötes is not rich in deep-sky objects, it contains a few interesting features:
- Boötes Void: A vast, nearly empty region of space, one of the largest known voids in the universe.
- NGC 5466: A globular cluster of stars located about 52,000 light-years away.
Mythological Background
In Greek mythology, Boötes is associated with Arcas, the son of Zeus and Callisto. When Callisto was transformed into a bear and placed in the heavens as the constellation Ursa Major, Arcas became Boötes, the herdsman who watches over the bear. Another interpretation connects Boötes to a plowman driving oxen, represented by the stars of the Big Dipper.
The name Boötes also appears in other cultures, where the constellation represents hunters, herdsmen, or plowmen, emphasizing its ties to agriculture and the heavens.
Cultural Significance
Boötes’ brightest star, Arcturus, has been a significant navigational aid and a symbol of spring due to its visibility during the season. The name Arcturus means "bear guard" in Greek, reflecting its position near Ursa Major.
The constellation's distinctive kite shape and its association with the Big Dipper make it a familiar and important feature of the night sky. Its connections to mythology, agriculture, and navigation ensure its enduring place in both cultural and astronomical traditions.
Bootes Rise and Set Timetable
| Time | Elevation | |
| Bootes transit | 15:32 | 87° |
Moonrise, 98.6% illuminated  | 17:09 | 70° |
| Sunset | 17:43 | 63° |
| Civil sunset | 18:11 | 58° |
| Astronomical observing session begins | 18:44 | 52° |
| Bootes set | 23:39 | |
| Astronomical observing session ends | 03:35 | -18° |
| Moonset | 04:01 | -18° |
| Bootes rise | 07:22 |
Track Bootes Position Throughout the Night
← 27 August 2026 →
| Time | |
| Altitude | |
| Azimuth |
Nebulae in the constellation Bootes
IC4473 NED03
Galaxy
Annual motion of Bootes
| Date | Fri, 28 August 2026 |
| Twilight start | 19:15 |
| Twilight end | 03:00 |
| Twilight duration | 8h 45m |
| Rise | 07:22 |
| Set | 23:35 |
| Elevation at transit | 87° |
| Transit time | 15:28 |
| Equatorial coordinates | RA: 14h 45m 47s", Dec: 34° 45' 32s |
| Magnitude | - |
| Constellation |
The vertical axis shows the hours of the day, while the horizontal axis spans the days of the year.
The reddish area marks when the constellation is above the horizon. The white line shows when it reaches its highest point in the sky. View detailed visibility information in a table with rise, transit, and set times for each date.
Acknowledgements
We gratefully acknowledge the International Astronomical Union (IAU) for defining and standardizing the official constellation boundaries used in celestial mapping.
Special thanks to Sky & Telescope Magazine and contributors Roger Sinnott and Rick Fienberg for producing the charts and tables. Alan MacRobert’s constellation patterns were influenced by the work of H. A. Rey and adjusted to align with earlier traditions.