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30 Arietis Bb
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>30 Arietis B</td></tr><tr> <td colspan="2">Constellation</td> <td>Aries</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>02h 36m 57.74s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+24° 38′ 53.0″[1]</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>7.09</td></tr><tr><td colspan="2">Distance</td><td>133 ± 3[1] ly
(41 ± 1[1] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>F6V</td></tr><tr> <td>Mass</td> <td style="text-align: center">(m)</td> <td>1.13 ± 0.08 M</td></tr><tr> <td>Radius</td> <td style="text-align: center">(r)</td> <td>1.13 ± 0.13 R</td></tr><tr> <td>Temperature</td> <td style="text-align: center">(T)</td> <td>6424 ± 180 K</td></tr><tr> <td>Metallicity</td> <td style="text-align: center">[Fe/H]</td> <td>0.07 ± 0.2</td></tr><tr> <td>Age</td> <td style="text-align: center"></td> <td>0.91 ± 0.03 Gyr</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.995 ± 0.012 AU
(148.9 ± 1.8 Gm)</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.708 AU
(105.9 Gm)</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>1.283 AU
(191.9 Gm)</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.289 ± 0.092</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>335.1 ± 2.5 d
(0.917 ± 0.007 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>32.3 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>307 ± 18°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2454538 ± 20 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>270 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>9.88 ± 0.94 MJ</td></tr><tr> <td>Temperature</td> <td style="text-align: center">(T)</td> <td>300 K</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>November 27, 2009</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Guenther et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>Karl Schwarzschild Observatory</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr> <tr style="background-color: #A0B0FF;"><td align=center colspan=3>Database references</td></tr><tr valign=baseline><td colspan=2>Extrasolar Planets
Encyclopaedia
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr>

30 Arietis Bb (sometimes abbreviated 30 Ari Bb) is an extrasolar planet which orbits the F-type main sequence star 30 Arietis B, located approximately 129 light years away in the constellation Aries. This planet has minimum mass nearly 10 times that of Jupiter. Because inclination is not known, its true mass is unknown. Meanwhile, this planet orbits only 0.005 AU (or 700,000 km) closer to the star than Earth to the Sun, but its orbital eccentricity is much higher compared to Earth. At periastron, the planet’s closest distance to the star is 0.708 AU, which is slightly closer to the star than Venus to the Sun. At apastron, the planet’s farthest distance to the star is 1.283 AU, which is more than half-way between the orbits of Earth and Mars.[2]

This gas giant planet was discovered on Friday, November 27, 2009 by using precise radial velocity method from echelle spectrograph installed in Alfred-Jensch telescope in Karl Schwarzschild Observatory.

References Edit

  1. 1.0 1.1 1.2 1.3 (2007). Validation of the new Hipparcos reduction. Astronomy and Astrophysics 474 (2): 653–664. Vizier catalog entry for A Vizier catalog entry for B
  2. (2009). A substellar component orbiting the F-star 30 Arietis B. Astronomy and Astrophysics 507 (3): 1659–1665.

Coordinates: Sky map 02h 36m 57.7405s, +24° 38′ 53.027″

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