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Iota Draconis b[1]
Extrasolar planet List of extrasolar planets
300px
Artist's concept of Iota Draconis b looking towards its giant sun
Parent star

<tr> <td colspan="2">Star</td> <td>Iota Draconis</td></tr><tr> <td colspan="2">Constellation</td> <td>Draco</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>15h 24m 55.7747s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+58° 57′ 57.836″</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>3.31</td></tr><tr><td colspan="2">Distance</td><td>102.7 ly
(31.5 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K2III</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.275 ± 0.074 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.7124 ± 0.0039</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>511.098 ± 0.089 d
(1.4 y)</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>91.58 ± 0.81°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,452,014.59 ± 0.30 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>307.6 ± 2.3 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>8.82 ± 0.72 MJ</td></tr><tr><td>Stellar flux</td><td style="text-align: center">(F)</td><td>34.3 </td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>January 8, 2002</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Frink et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler Spectroscopy</td></tr><tr> <td colspan="2">Discovery status</td> <td>Confirmed</td></tr>

Other designations
HD 137759 b, HIP 75458 b

<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>

Iota Draconis b was discovered in 2002 during a radial velocity study of K-class giant stars and was the first planet discovered orbiting a giant star. It is in an eccentric orbit, which aided its detection as giant stars have pulsations which can mimic the presence of a planet.[2]

ReferencesEdit

  1. Butler et al. (2006). Catalog of Nearby Exoplanets. The Astrophysical Journal 646 (1): 505–522.
  2. Frink et al. (2002). Discovery of a Substellar Companion to the K2 III Giant Iota Draconis. The Astrophysical Journal 576 (1): 478–484.

External linksEdit

Coordinates: Sky map 15h 24m 55.7747s, +58° 57′ 57.836″


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