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Corona Borealis, The Northern Crown Constellation

Corona Borealis (Pronounciation:Core-ona Bore-e-a-liss, Abbrev:CrB, Latin:Coronae Borealis) is a constellation, one of 88 constellations that the night sky is divided into. The sky is not divided up equally between the constellations. Corona Borealis takes up 178.71 sq. degrees of the night sky which equates to 0.43% of the night sky. The constellation gets its name as it name means The Northern Crown . The constellation is one of the original constellations that was devised by the Ancient Greco-Egyptian astronomer Ptolemy who lived between 90 A.D. and 168 A.D.

Corona Borealis is not a member of the Zodiac group of twelve constellations that appear when the Sun sets. Corona Borealis is a northern hemispheric constellation which means it can't be seen easily or at all from the southern hemisphere.

The brightest star in Corona Borealis is Alphecca. There are 1 Extrasolar Planets (Exoplanets) in this constellation that are detailed on this site. There is a dedicated page for exoplanets in Corona Borealis. The current largest star so far identified in the constellation of Corona Borealis is S Coronae Borealis.

Corona Borealis Star and Deep Space Object Count

The number of stars that have been catalogued as part of the Hipparcos Star Catalogue from Corona Borealis is 451. The number of stars that are of magnitude 6.0 or lower in the constellation is 25. The number of stars in the constellation that make up the outline is 7.

There are no deep space objects that were identified by Charles Messier in this constellation. There are no non-Messier deep space objects in this constellation that are covered at present on this site.

Stars of Interest

The nearest star to Earth is HIP 78775 which is roughly about 47.36 Light Years from the Earth. The nearest star to the Earth with an exoplanet is HD 145457 which is about 408.73 Light Years. The furthest star that can be located in the constellation is HIP 77697 which is located about 108721.1 Light Years away from the Sun. The furthest figure is derived from either the 1997 or 2007 Hipparcos star catalogue parallax figure and it has been known to produce distances that are wrong.

The dimmest star that can be seen in Corona Borealis with the naked eye is R Coronae Borealis. The dim star has an apparent magnitude of 5.89. The dimmest star that a person is able to see with their naked eye is 6.0 magnitude based on the table in the reference. Ref: University of Michigan

The caveat of these stars are that they are catalogued on this site. If you know of a star that is nearer or further then do let me know in the comments and I'll add it to the site. The stars mentioned are from the Hipparcos catalogue or have been added because of their special status.

Constellation Legend

Believed to be the crown given to Dionysus to Ariadne, the daughter of Minos of Crete.

There are no major meteor showers that radiate from within this constellation.

Corona Borealis Facts

NameCorona Borealis
Is a Zodiac Sign No
Largest StarS Coronae Borealis
Brightest StarAlphecca
Area178.71 sq. deg.
Percentage of Night Sky0.43%
Size Position73rd
Hemisphere Northern
Site Exoplanet Count1
Meteor Shower Count5
Nearest StarHIP 78775
Nearest Star with Exoplanet(s)HD 145457
Dimmest StarR Coronae Borealis
Furthest StarHIP 77697
Bright Star Count25
Hipparcos Star Count451
Main Star Count7
Messier Deep Space Object Count0
*Non-Messier Deep Space Object Count0
Bordering / Neighbouring / Surrounding ConstellationsBootes

*Note: The number of Non-Messier Deep Space Object Count relates to how many are covered on this site not how many there are.

Corona Borealis Constellation Map

Corona Borealis Constellation Star Map

The map was generated using Night Vision, an awesome free application by Brian Simpson.

List of Named Stars in Corona Borealis

As there's so many stars in the cosmos, not all the stars are listed here. The site has lots of stars not listed so if your star isn't listed and you know the Henry Draper or Hipparcos ID, type https://www.universeguide.com/star/ then followed by the HIPNNNNNN or HDNNNN where NNNNN is the number part of the name. The stars that I do list have either a traditional name, a bayer or other classification name.

StarDistance (Lt. Yrs.)DeclinationRight Ascension
23 Herculis585.57+32d 19` 58.916h 22m 56.48
ADS 9731359.61+36d 14` 48.315h 38m 12.96
Alphecca75.05+26d 42` 53.715h 34m 41.19
Delta Coronae Borealis170.05+26d 04` 06.815h 49m 35.70
Epsilon Coronae Borealis221.43+26d 52` 40.915h 57m 35.30
Eta Coronae Borealis58.26+30d 17` 17.715h 23m 12.23
Gamma Coronae Borealis146.07+26d 17` 43.915h 42m 44.64
Iota Coronae Borealis311.82+29d 51` 03.916h 01m 26.59
Kappa Coronae Borealis99.47+35d 39` 29.615h 51m 13.94
Lambda Coronae Borealis135.56+37d 56` 48.315h 55m 47.57
Mu Coronae Borealis618.91+39d 00` 36.215h 35m 14.90
Nu1 Coronae Borealis640.79+33d 47` 56.916h 22m 21.42
Nu2 Coronae Borealis594.10+33d 42` 12.116h 22m 29.22
Nusakan111.81+29d 06` 19.815h 27m 49.85
Omicron Coronae Borealis270.00+29d 36` 58.715h 20m 08.64
Pi Coronae Borealis243.41+32d 30` 57.015h 43m 59.32
R Coronae Borealis81540.84+28d 09` 24.415h 48m 34.42
Rho Coronae Borealis56.22+33d 18` 19.416h 01m 02.80
RR Coronae Borealis1113.19+38d 33` 26.915h 41m 26.21
RS Coronae Borealis1072.91+36d 01` 19.715h 58m 30.80
RT Coronae Borealis+29d 29` 14.015h 38m 03.03
RW Coronae Borealis679.51+29d 37` 19.715h 39m 15.24
S Coronae Borealis1763.05+31d 22` 02.715h 21m 23.96
Sigma Coronae Borealis68.75+33d 51` 31.816h 14m 41.04
T Coronae Borealis3469.82+25d 55` 12.515h 59m 30.17
Tau Coronae Borealis116.70+36d 29` 24.416h 08m 58.33
Theta Coronae Borealis375.33+31d 21` 33.015h 32m 55.80
U Coronae Borealis811.35+31d 38` 49.515h 18m 11.36
Upsilon Coronae Borealis667.00+29d 09` 01.116h 16m 44.77
V Coronae Borealis8815.23+39d 34` 18.015h 49m 31.31
Xi Coronae Borealis183.44+30d 53` 30.216h 22m 05.89
YY Coronae Borealis301.17+37d 50` 07.515h 50m 32.49
Zeta2 Coronae Borealis473.39+36d 38` 09.015h 39m 22.68

Corona Borealis Constellation's Star Breakdown

Type Breakdown

KLight Orange Star 3,700 - 5,200k172
FYellow-White 6,000 - 7,500k96
GYellow 5,200 - 6,000k82
AWhite 7,500 - 10,000k46
MRed Dwarf Star <3,700k40
BBlue-White 10,500 - 30,000k4

Size Breakdown

IIINormal Giant32
VMain Sequence27

Breakdown of Carbon Stars by Type

CC-Type Carbon Star1
RR-Type Carbon Star1
NN-Type Carbon Star1

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