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HD 73256 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 73256</td></tr><tr> <td colspan="2">Constellation</td> <td>Pyxis</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>08h 36m 23.0155s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>−30° 02′ 15.456″</td></tr><tr><td colspan="2">Distance</td><td>119 ly
(36.5 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G9V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.037 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.036 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>0.038 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.029±0.02</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>2.54858±0.00016 d</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>160 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>337±46°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2452500.18±0.28 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>269±8 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>1.87 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>2003</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Udry et al.</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, Chile</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 73256 b is an 1.87 MJ hot Jupiter orbiting at 0.037 AU taking 2.55 days to orbit around HD 73256.[1]

Assuming the planet is perfectly grey with no greenhouse or tidal effects, and a Bond albedo of 0.1, the temperature would be about 1300 K. This is close to 51 Pegasi b; between the predicted temperatures of HD 189733 b and HD 209458 b (1180-1392K), before they were measured. It is a candidate for "near-infrared characterisation with the VLTI Spectro-Imager".[2]

See also Edit

ReferencesEdit

External links Edit

Coordinates: Sky map 08h 36m 23.0155s, −30° 02′ 15.456″


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