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42 Draconis b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>42 Draconis</td></tr><tr> <td colspan="2">Constellation</td> <td>Draco</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>18h 25m 59.14s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+65° 33′ 48.5″[1]</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>4.833</td></tr><tr><td colspan="2">Distance</td><td>315 ± 6[1] ly
(97 ± 2[1] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K1.5III</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.19 ± 0.01 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.74 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>1.64 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.38 ± 0.06</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>479.1 ± 6.2 d
(1.312 ± 0.017 y)</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>218.7 ± 10.6°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2452757.4 ± 3.7 JD</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>3.88 ± 0.85 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>March 20, 2009</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Doellinger et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>TLS</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>

42 Draconis b (sometimes abbreviated 42 Dra b) is an extrasolar planet located approximately 315 light years away in the constellation of Draco, orbiting the 5th magnitude K-type giant star 42 Draconis. It takes 479 days to orbit the star in a 38% eccentricity.[2] This planet was discovered by radial velocity method on March 20, 2009, which was the first day of spring.

See alsoEdit

References Edit

  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. (2009). Planetary companion candidates around the K giant stars 42 Draconis and HD 139 357. Astronomy and Astrophysics 499 (3): 935–942.

Coordinates: Sky map 18h 25m 59.1381s, +65° 33′ 48.530″


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