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HD 192263 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 192263</td></tr><tr> <td colspan="2">Constellation</td> <td>Aquila</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>20h 13m 59.8451s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–00° 52′ 00.757″</td></tr><tr><td colspan="2">Distance</td><td>64.88 ly
(19.89 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K2V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.15 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>24.348 ± 0.005 d
(0.066661 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>67.2 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>0°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,451,979.28 ± 0.08 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>51.9 ± 2.6 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>0.75 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>September 28th, 1999</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Santos, Mayor,
Naef et al.[1]</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler Spectroscopy
(CORALIE)</td></tr><tr> <td colspan="2">Discovery site</td> <td>La Silla Observatory</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published[1]</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 192263 b is a gas giant planet with a mass about three quarters that of Jupiter mass. It orbits the star in a circular orbit completing one revolution in 24 days or so. It was discovered in 2000 by the Geneva Extrasolar Planet Search team.[1]

In 2002 the existence of the planet was questioned by G. Henry: The star was observed to have photometric brightness variations that have same period and velocities as the planet. The signal could come from those variations instead of the planet orbiting the star or suggests that rotational modulation of the visibility of stellar surface activity is the source of the observed radial velocity variations.[2] Finally, in 2003 the planet was confirmed; the planet is thought to be causing fluctuations in the system's magnetic field, causing visible activity.[3]

Preliminary astrometry in 2001 set its inclination at 179.5°;[4] but it is now thought to be inclined according to the star's ecliptic, edge-on to Earth.

ReferencesEdit

External links Edit

Coordinates: Sky map 20h 13m 59.8451s, −00° 52′ 00.757″ Template:Star systems within 60 – 65 light-years


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