HD 170469 b
Extrasolar planet List of extrasolar planets
HD 170469 b's orbit compared to the orbit
of Mars (1.5AU) in our Solar System.
Parent star

<tr> <td colspan="2">Star</td> <td>HD 170469</td></tr><tr> <td colspan="2">Constellation</td> <td>Ophiuchus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>18h 29m 10.9801s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+11° 41′ 43.807″</td></tr><tr><td colspan="2">Distance</td><td>211.91 ly
(64.97 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G5IV</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>2.24 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.11 ± 0.08</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>1145 ± 18 d
(3.13 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>19.8 km/s</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>73 ± 19°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,451,826 ± 4 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>23.8 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>0.67 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>April 10, 2007</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Fischer et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>California, USA</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published[1]</td></tr>

Other designations
HIP 90593 b

<tr style="background-color: #A0B0FF;"><td align=center colspan=3>Database references</td></tr><tr valign=baseline><td colspan=2>Extrasolar Planets
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr>

HD 170469 b is a gas giant exoplanet located approximately 212 light-years away in the constellation Ophiuchus, orbiting the star HD 170469. This planet was discovered in April 2007. The star is 1.1 solar mass and the planet is at least 67% the mass of Jupiter, orbiting about half the distance of Jupiter from the Sun. The mass value is only minimum since the inclination is unknown.

The orbital distance is more than twice the distance from Earth to the Sun, although taking over three Earth years to orbit the star. The combined distance and period would make orbital velocity of 19.8 km/s, slower than Earth's 29.8 km/s.[1]


  1. 1.0 1.1 (2007). Five Intermediate-Period Planets from the N2K Sample. The Astrophysical Journal 669 (2): 1336–1344.

External links Edit

Coordinates: Sky map 18h 29m 10.9801s, +11° 41′ 43.807″

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