Berenice’s Hair · pronounced Coma Berenices. Coma Berenices, meaning “Berenice’s Hair,” is an official IAU constellation centred near right ascension 12.9 hours and declination 24°. Its northern position determines where and when it is easiest to observe. It entered Western celestial cartography after antiquity, during the era when navigators and instrument makers filled gaps absent from Ptolemy’s classical catalogue. The IAU later retained the name while defining exact international boundaries. The plotted outline is only a recognition aid; every galaxy, nebula and star inside the official boundary belongs to Coma Berenices, even when it is not joined by a line. Observers should begin with a wide-field chart, identify brighter neighbouring patterns, and then compare the field with a red-light atlas. Binoculars reveal denser star fields than the naked eye, while a telescope is needed for most faint deep-sky targets. Because visibility changes with latitude, season and local horizon, the coordinates and boundary chart are more reliable than mythology alone when planning an observing session.
About Coma Berenices
Coma Berenices is one of the 88 constellations recognized by the International Astronomical Union. Its standard three-letter abbreviation is Com, and astronomers use the genitive form Comae Berenices when naming stars associated with it. The constellation's reference position lies around right ascension -11.1 hours and declination +24 degrees.
Its location places it in the northern sky. For a typical mid-latitude observer, this part of the celestial sphere is especially well placed during spring evenings. Exact visibility depends on latitude, local horizon, date and time.
History and mythology of Coma Berenices
Early-modern origin
It entered Western celestial cartography after antiquity, during the era when navigators and instrument makers filled gaps absent from Ptolemy’s classical catalogue. The IAU later retained the name while defining exact international boundaries.
The modern constellation
In 1922 the International Astronomical Union adopted Coma Berenices among the 88 official constellations. Eugène Delporte’s later boundary work made it a defined region of the celestial sphere, allowing cataloguers to assign objects unambiguously.
How to find Coma Berenices
- Choose a dark site with a clear view toward the northern sky.
- Observe during northern spring and summer evenings, when the constellation is better placed in the evening.
- Centre a chart near RA 12.9h, Dec 24° and identify brighter neighbouring patterns before tracing its official line figure.
- Confirm faint targets with an interactive Aladin or Stellarium view; the IAU boundary extends beyond the connected stars.
Bright stars in Coma Berenices
Beta Comae Berenices
Notable star- Magnitude
- 4.26
- Distance
- about 30 light-years
A documented stellar landmark in Berenice’s Hair; magnitude is apparent visual brightness and distance is rounded.
Diadem
Notable star- Magnitude
- 4.32
- Distance
- about 58 light-years
A documented stellar landmark in Berenice’s Hair; magnitude is apparent visual brightness and distance is rounded.
Gamma Comae Berenices
Notable star- Magnitude
- 4.35
- Distance
- about 167 light-years
A documented stellar landmark in Berenice’s Hair; magnitude is apparent visual brightness and distance is rounded.
FK Comae Berenices
Notable star- Magnitude
- 8.1
- Distance
- about 750 light-years
A documented stellar landmark in Berenice’s Hair; magnitude is apparent visual brightness and distance is rounded.
Deep-sky objects in Coma Berenices
Melotte 111
A well-established open cluster within the official Berenice’s Hair sky region and a useful target for appropriately sized optics.
M53
A well-established globular cluster within the official Berenice’s Hair sky region and a useful target for appropriately sized optics.
M64 Black Eye
A well-established spiral galaxy within the official Berenice’s Hair sky region and a useful target for appropriately sized optics.
NGC 4565 Needle
A well-established spiral galaxy within the official Berenice’s Hair sky region and a useful target for appropriately sized optics.
Coma Cluster
A well-established galaxy cluster within the official Berenice’s Hair sky region and a useful target for appropriately sized optics.
Interesting facts about Coma Berenices
- Coma Berenices’s traditional name refers to berenice’s hair, while its official IAU boundary defines a precise region of the sky.
- Beta Comae Berenices, at magnitude 4.26, is a key star in Coma Berenices. A documented stellar landmark in Berenice’s Hair; magnitude is apparent visual brightness and distance is rounded.
- Melotte 111 is a notable open cluster in Coma Berenices. A well-established open cluster within the official Berenice’s Hair sky region and a useful target for appropriately sized optics.
- M53, a globular cluster, is another observing target within the constellation.
- It entered Western celestial cartography after antiquity, during the era when navigators and instrument makers filled gaps absent from Ptolemy’s classical catalogue.