Alpha Ophiuchi
Sign in to saveAlso known as α Oph, Rasalhague, α Ophiuchi, GJ 681, HIC 86032, HIP 86032, HD 159561, HR 6556
star in the constellation Ophiuchus
Key facts
- Constellation
- Ophiuchus
- Right ascension
- 17 34 56.06945
- Declination
- +12 ° 33 ′ 36.1346 ″
- Evolutionary stage
- Main sequence
- Spectral type
- A5IVnn + K5–7 V
- U b color index
- +0.10
- B v color index
- +0.15
via Wikipedia infobox
Wikidata facts
- Constellation
- Ophiuchus
- Diameter
- 4130000
- Radius
- 2.6
- Variable-star type
- Cepheid variable
- Image
- Ophiuchus constellation map.png
Show 15 more facts
- spectral class
- A5 III
- catalog code
- WISE J173456.17+123330.2
- stellar rotational velocity
- 210.0
- apparent magnitude
- 2.108286
- right ascension
- 263.73419686427
- declination
- 12.55900984328
- effective temperature
- 7798
- parallax
- 69.84
- radial velocity
- -37.3
- epoch
- J2000.0
- metallicity
- -0.16
- surface gravity
- 7800
- absolute magnitude
- 1.205
- right ascension component of proper motion
- 119
- declination component of proper motion
- -225
Sources (2)
via Wikidata · CC0
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Encyclopedic overview
Alpha Ophiuchi (α Ophiuchi, abbreviated Alpha Oph, α Oph), also named Rasalhague /ˈræsəlheɪɡ/, is a binary star and the brightest star in the constellation of Ophiuchus. Five degrees west-north-west of Rasalhague lies Rasalgethi, one of the brightest stars in the nearby constellation Hercules.
Nomenclature
Excerpted from Wikipedia’s “Alpha Ophiuchi” article, available under the CC BY-SA 4.0 licence.