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HD 175541 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 175541</td></tr><tr> <td colspan="2">Constellation</td> <td>Serpens</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>18h 55m 40.884s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+04° 15′ 55.17″[1]</td></tr><tr><td colspan="2">Distance</td><td>approx. 410[1] ly
(approx. 130[1] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G8IV</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.03 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.69 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>1.37 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.33 ± 0.2</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>297.3 ± 6 d
(0.8140 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>37.8 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>183 ± 30°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,450,213 ± 20 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>14 ± 2 m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>>0.61 MJ
(190 M)</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>Johnson et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler spectroscopy</td></tr><tr> <td colspan="2">Discovery site</td> <td>Lick Observatory
and Keck Observatory
Template:Country data USA</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr>

Other designations
GJ 736 b, HIP 92895 b

<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 175541 b is a jovian planet located approximately 410 light-years away in the constellation of Serpens, orbiting the star HD 175541. This planet was discovered in April 2007. Despite the distance of planet to star slightly more than Earth to the Sun, the period is less than 300 days that orbits in an eccentric orbit, because the parent star is 65% more massive than our Sun.[2]

The discovery of this planet and two others: HD 192699 b and HD 210702 b around intermediate-mass stars provide clues about the formation and history of migration of planets around the A-type stars.

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. (2007). Retired A Stars and Their Companions: Exoplanets Orbiting Three Intermediate-Mass Subgiants. The Astrophysical Journal 665 (1): 785–793.

External links Edit

Coordinates: Sky map 18h 55m 40.8837s, +04° 15′ 55.169″


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