Alpha Arietis
Sign in to saveAlso known as Hamal, α Arietis, α Ari, 13 Ari, 13 Arietis, LTT 10711, GJ 84.3, GJ 9072
Hamal, , is a star in the northern zodiacal constellation of Aries. It has the Bayer designation Alpha Arietis, which is Latinized from α Arietis and abbreviated Alpha Ari or α Ari. This star is visible to the naked eye with an apparent visual magnitude of 2.0. Hamal is the brightest star in the constellation and, on average, the 50th-brightest star in the night sky. Based upon parallax measurements made with the Hipparcos astrometry satellite, Hamal is about from Earth. It is drifting closer to the Sun with a radial velocity of −14 km/s.
Wikidata facts
- Instance of
- orange giant
- Constellation
- Aries
- Distance from Earth
- 20.2
- Radius
- 13.9
- Mass
- 1.5
Show 14 more facts
- catalog code
- [B10] 447
- spectral class
- K2 IIIab
- metallicity
- -0.19
- radial velocity
- -14.412
- apparent magnitude
- -0.63
- stellar rotational velocity
- 0.50
- effective temperature
- 4537
- surface gravity
- 700
- right ascension
- 31.793357100
- declination
- 23.462417550
- parallax
- 49.48
- epoch
- J2000.0
- right ascension component of proper motion
- 192
- declination component of proper motion
- -146
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Encyclopedic overview
8 sectionsContents
- Nomenclature
- Properties
- Planetary system
- In culture
- See also
- Notes
- References
- External links
Hamal, , is a star in the northern zodiacal constellation of Aries. It has the Bayer designation Alpha Arietis, which is Latinized from α Arietis and abbreviated Alpha Ari or α Ari. This star is visible to the naked eye with an apparent visual magnitude of 2.0. Hamal is the brightest star in the constellation and, on average, the 50th-brightest star in the night sky. Based upon parallax measurements made with the Hipparcos astrometry satellite, Hamal is about from Earth. It is drifting closer to the Sun with a radial velocity of −14 km/s.
This is an aging giant star that is likely to host an orbiting planet with a mass greater than Jupiter.
Excerpted from Wikipedia’s “Alpha Arietis” article, available under the CC BY-SA 4.0 licence.