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HD 45350 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 45350</td></tr><tr> <td colspan="2">Constellation</td> <td>Auriga</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>06h 28m 45.7103s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+38° 57′ 46.667″[1]</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>7.88[1]</td></tr><tr><td colspan="2">Distance</td><td>160 ± 8[1] ly
(49 ± 2[1] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G5 IV[2]</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.92 ± 0.067[3] AU
(287 ± 10 Gm)</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.43 AU
(64 Gm)</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>3.41 AU
(511 Gm)</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.778 ± 0.009[3]</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>963.6 ± 3.4[3] d
(2.64 ± 0.01 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>21.7 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>343.4 ± 2.3[3]°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,451,825.3 ± 7.1[3] JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>58.0 ± 1.7[3] m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>1.79 ± 0.14[3] MJ
(569 ± 44 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>January 20, 2005</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Marcy, Butler,
Vogt, et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>Keck Observatory, Hawaii
Template:Country data United States</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published[4]</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 45350 b is an extrasolar planet located approximately 160 light-years away in the constellation of Auriga. It has a minimum mass about 1.79 times that of Jupiter. The mean distance of the planet from the star is more than the distance between Mars and the Sun, but the eccentricity of the orbit is nothing short of remarkable; at periastron the planet is as close to the star as Mercury is from the Sun, but at apastron it is 8 times further. No doubt seasons on the planet would be extreme.

Dynamical simulations covering a period of 107 years show that a second, low-mass, planet could only orbit stably if it were no more than 0.2 AU away from the star; in the simulations, these planets show oscillations in eccentricity up to an eccentricity of 0.25. Radial velocity observations rule out any such planet whose mass is greater than 4 Neptune masses.[5]

ReferencesEdit

  1. 1.0 1.1 1.2 1.3 1.4 HD 45350 -- Star, database entry, SIMBAD, accessed on line September 22, 2008.
  2. Star : HD 45350, entry, Extrasolar Planets Encyclopaedia, accessed on line September 22, 2008.
  3. 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Table 2, combined solution, Determination of the Orbit of the Planetary Companion to the Metal-Rich Star HD 45350, Michael Endl, William D. Cochran, Robert A. Wittenmyer, and Artie P. Hatzes, Astronomical Journal 131, #6 (June 2006), pp. 3131–3134, Template:Bibcode, Template:Doi.
  4. Five New Extrasolar Planets, Geoffrey W. Marcy, R. Paul Butler, Steven S. Vogt, et al., Astrophysical Journal 619, #1 (January 20, 2005), pp. 570–584, Template:Bibcode, Template:Doi.
  5. Dynamical and Observational Constraints on Additional Planets in Highly Eccentric Planetary Systems, Robert A. Wittenmyer, Michael Endl, William D. Cochran, and Harold F. Levison, Astronomical Journal 134, #3 (September 2007), pp. 1276–1284, Template:Bibcode, Template:Doi.

External links Edit

Coordinates: Sky map 06h 28m 45.7103s, +38° 57′ 46.667″de:HD 45350 b

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