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HD 4208 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 4208</td></tr><tr> <td colspan="2">Constellation</td> <td>Sculptor</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>00h 44m 26.65s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–26° 30′ 56.4″[1]</td></tr><tr><td colspan="2">Distance</td><td>106 ± 3[1] ly
(32.4 ± 0.8[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>1.650 ± 0.096 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>1.564 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>1.736 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.052 ± 0.040</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>828.0 ± 8.1 d
(2.267 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>21.75 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>345°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,451,040
± 120 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>19.06 ± 0.73 m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>>0.804 ± 0.073 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>15 October 2001</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>California and Carnegie
Planet Search
</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler Spectroscopy</td></tr><tr> <td colspan="2">Discovery site</td> <td>Keck telescope</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published[2]</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>

The extrasolar planet, designated as HD 4208 b, was discovered by the California and Carnegie Planet Search team using the Keck telescope. The planet is probably somewhat less massive than Jupiter, although only its minimum mass is known. Its orbital distance is 1.67 AU, slightly further than Mars and its eccentricity is low.[2][3]

ReferencesEdit

  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. 2.0 2.1 (2002). Ten Low-Mass Companions from the Keck Precision Velocity Survey. The Astrophysical Journal 568 (1): 352–362.
  3. (2006). Catalog of Nearby Exoplanets. The Astrophysical Journal 646 (1): 505–522.

External links Edit

Coordinates: Sky map 00h 44m 26.65s, −26° 30′ 56.45″


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