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HD 173416 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 173416</td></tr><tr> <td colspan="2">Constellation</td> <td>Lyra</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>18h 43m 36.1097s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+36° 33′ 23.777″</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>6.057</td></tr><tr><td colspan="2">Distance</td><td>440 ± 31.3 ly
(135 ± 9.6 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G8III</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.16 ± 0.06 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.92 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>1.40 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.21 ± 0.04</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>323.6 ± 2.2 d
(0.8860 ± 0.0060 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>39.13 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>254 ± 11°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>3465.8 ± 8.3 JD</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>2.7 ± 0.3 MJ
(860 ± 100 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>January 10, 2009</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Liu et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>radial velocity</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>

HD 173416 b is an extrasolar planet located approximately 440 light years away in the constellation of Lyra, orbiting the 6th magnitude G-type giant star HD 173416. This is planet has at least 2.7 times the mass of Jupiter and was discovered on January 10, 2009 by Liu et al. HD 173416 b orbits at 1.16 AU from the star. However despite the fact that the planet orbits 16% further from the star than Earth does from the Sun, it has orbital period of only 323.6 days, compared to 365.25 days for Earth. This inverse relationship is caused by the parent star having twice the mass of our Sun, which increases the strength of its gravitional field. This evidence implies that when this star was on the main sequence, it was an A-type star.

References Edit

External links Edit

Coordinates: Sky map 18h 43m 36.1097s, +36° 33′ 23.777″


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