Alphecca
Sign in to saveAlso known as Alpha Coronae Borealis, 5 Coronae Borealis, Gemma, Gnosia Stella Coronae, α CrB, α Coronae Borealis
binary star in the constellation Corona Borealis
Key facts
- Constellation
- Corona Borealis
- Right ascension
- 15 34 41.268
- Declination
- +26 ° 42 ′ 52.89 ″
- Spectral type
- A0V + G5V
- U b color index
- −0.03
- B v color index
- −0.02
- Variable type
- Eclipsing binary
via Wikipedia infobox
Wikidata facts
- Constellation
- Corona Borealis
- Distance from Earth
- 74.7
- Diameter
- 3780000
- Mass
- 2.58
- Variable-star type
- eclipsing binary star
- Image
- Alpha Coronae Borealis.jpg
Show 15 more facts
- catalog code
- UBV M 20847
- spectral class
- A0
- apparent magnitude
- 2.21
- right ascension
- 233.671950015
- declination
- 26.714692781
- effective temperature
- 10900
- stellar rotational velocity
- 120
- parallax
- 0.05
- radial velocity
- -15.6
- epoch
- J2000.0
- surface gravity
- 20000
- right ascension component of proper motion
- 121
- declination component of proper motion
- -89
- age estimated by a dating method
- 0.314
- metallicity
- 0.2
via Wikidata · CC0
~4 min read
Encyclopedic overview
Alpha Coronae Borealis (α Coronae Borealis, abbreviated Alpha CrB, α CrB), officially named Alphecca /ælˈfɛkə/, is an eclipsing binary star in the constellation of Corona Borealis. It is located about 75 light years from the Sun and contains two main sequence stars, one class A and one class G.
Properties
Excerpted from Wikipedia’s “Alphecca” article, available under the CC BY-SA 4.0 licence.