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HD 2638 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 2638</td></tr><tr> <td colspan="2">Constellation</td> <td>Cetus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>00h 29m 59.873s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–05° 45′ 50.40″[1]</td></tr><tr><td colspan="2">Distance</td><td>160 ± 10[1] ly
(50 ± 4[1] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G5V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.044 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>3.4442 ± 0.0002 d</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>2,453,323.206
± 0.002 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>67.4 ± 0.4 m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>>0.48 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>2005</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Moutou, Mayor,
Bouchy et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>Geneva</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr>

HD 2638 b is a planet of the star HD 2638. It is a typical "hot Jupiter", a planet that orbits its parent star in a very tight "torch orbit". Distance to the star is less than 1/20th Earth's distance from the Sun. One orbital revolution lasts only about three and half days.[2]

References Edit

External links Edit

Coordinates: Sky map 00h 29m 59.87s, −05° 45′ 50.41″


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