AB Aurigae
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 AB Aurigae and its dust disk. |
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Auriga |
| Right ascension | 04h 55m 45.8445s |
| Declination | +30° 33′ 04.292″ |
| Apparent magnitude (V) | 7.06 |
| Characteristics | |
| Spectral type | A0Vpe |
| U−B color index | 0.04 |
| B−V color index | 0.11 |
| Variable type | Orion variable |
| Astrometry | |
| Radial velocity (Rv) | 8 km/s |
| Proper motion (μ) | RA: 1.71 mas/yr Dec.: -24.24 mas/yr |
| Parallax (π) | 6.93 ± 0.95 mas |
| Distance | approx. 470 ly (approx. 140 pc) |
| Absolute magnitude (MV) | 7.18 |
| Details | |
| Mass | 3.1 M☉ |
| Radius | 2.1 R☉ |
| Luminosity | 40 L☉ |
| Temperature | 7,500–10,000 K |
| Age | 3 ± 4 million years |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
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AB Aurigae is a star in the Auriga constellation. It is better known for hosting a dust disk that may harbour a condensing planet or brown dwarf. The star could host a possible substellar companion in wide orbit.
Planetary System
Oppenheimer et al. (2008)[1] observed an annulus feature in AB Aurigae's dust disk between 43 and 302 AU from the star, a region never seen before. An azimuthal gap in an annulus of dust at a radius of 102 AU would suggest the formation of at least one small body at an orbital distance of nearly 100 AU. Such object could turn out either a massive planetary companion or more likely a brown dwarf companion, in both cases located at nearly 100 AU from the bright star. So far the object is unconfirmed.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b (unconfirmed) | ≥5–37 MJ | 102 | ≥800 | ? | — | — |
See also
References
Further reading
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External links
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