Q10848431
Sign in to saveAlso known as Alruba
Alruba, a name derived from Arabic for "the foal", is a suspected astrometric binary star system in the northern circumpolar constellation of Draco. It is just barely visible to the naked eye as a dim point of light with an apparent visual magnitude of 5.76. Based on parallax measurements obtained during the Gaia mission, it is located at a distance of about from the Sun. The system is drifting closer with a radial velocity of −2 km/s.
Astronomical data · SIMBAD
- Object type
- *
- Spectral type
- A2V
- Distance
- 464 light-years
- Redshift
- z = 0.000008972914417260114
- Coordinates
- RA 265.9965° · Dec 53.8017°
via SIMBAD · CDS Strasbourg
Wikidata facts
- Constellation
- Draco
- Distance from Earth
- 139.9854
- Radius
- 4.09
Show 14 more facts
- catalog code
- Gaia DR2 1416872022613598464
- apparent magnitude
- 5.585
- right ascension
- 265.99654369048780
- declination
- 53.80171214719700
- effective temperature
- 9226
- radial velocity
- -0.4
- stellar rotational velocity
- 130
- parallax
- 6.050
- spectral class
- A0
- epoch
- J2000.0
- absolute magnitude
- -0.32
- right ascension component of proper motion
- 19
- declination component of proper motion
- -20
- age estimated by a dating method
- 58
Sources (2)
via Wikidata · CC0
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Encyclopedic overview
2 sectionsContents
- Nomenclature
- References
Alruba, a name derived from Arabic for "the foal", is a suspected astrometric binary star system in the northern circumpolar constellation of Draco. It is just barely visible to the naked eye as a dim point of light with an apparent visual magnitude of 5.76. Based on parallax measurements obtained during the Gaia mission, it is located at a distance of about from the Sun. The system is drifting closer with a radial velocity of −2 km/s.
The visible component is an A-type main-sequence star with a stellar classification of A0 V. It is about 58 million years old with three times the mass of the Sun and has a high rate of spin, showing a projected rotational velocity of 170 km/s. The star is radiating 147 times the luminosity of the Sun from its photosphere at an effective temperature of 9,226 K. The system is a source for X-ray emission, which is most likely coming from the unseen companion.
Excerpted from Wikipedia’s “Q10848431” article, available under the CC BY-SA 4.0 licence.