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HD 16417 b
Extrasolar planet List of extrasolar planets
300px
HD 16417 b's orbit compared to Mercury's
orbit (0.38AU) in our Solar System.
Parent star

<tr> <td colspan="2">Star</td> <td>HD 16417</td></tr><tr> <td colspan="2">Constellation</td> <td>Fornax</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>02h 36m 58.61s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–34° 34′ 40.7″[1]</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>5.78</td></tr><tr><td colspan="2">Distance</td><td>84.1 ± 0.9[1] ly
(25.8 ± 0.3[1] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G1V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.14 ± 0.01 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.11 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>0.17 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.20 ± 0.09</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>17.24 ± 0.01 d
(0.04720 ± 0.00003 y)</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>77 ± 26°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2450099.74 ± 3.3 JD</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>0.069 ± 0.007 MJ
(21.93 ± 2.22 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>February 23, 2009</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>O’Toole et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>Anglo-Australian Observatory</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published[2]</td></tr>

Other designations

<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 16417 b (also called λ2 Fornacis b) is an extrasolar planet located approximately 84 light years away in the constellation of Fornax, orbiting the 6th magnitude G-type main sequence star HD 16417. This planet has minimum mass only 7% that of Jupiter, making this a Neptune-mass planet. In addition to this, it orbits relatively close to the host star and suffers high temperature. It is the third planet discovered in Fornax constellation on February 23, 2009. This planet was discovered by a method called the radial velocity method.

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
  2. (2009). A Neptune-mass Planet Orbiting the Nearby G Dwarf HD16417. The Astrophysical Journal 697 (2): 1263–1268.

Coordinates: Sky map 02h 36m 58.6079s, −34° 34′ 40.717″


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