47 Ursae Majoris d
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>47 Ursae Majoris</td></tr><tr> <td colspan="2">Constellation</td> <td>Ursa Major</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>10h 59m 28.0s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+40° 25′ 49″</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>5.03</td></tr><tr><td colspan="2">Distance</td><td>45.9 ly
(14.06 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G1V</td></tr><tr> <td>Mass</td> <td style="text-align: center">(m)</td> <td>1.08 M</td></tr><tr> <td>Radius</td> <td style="text-align: center">(r)</td> <td>1.172 ± 0.111 R</td></tr><tr> <td>Temperature</td> <td style="text-align: center">(T)</td> <td>5887 ± 3.8 K</td></tr><tr> <td>Metallicity</td> <td style="text-align: center">[Fe/H]</td> <td>0.04</td></tr><tr> <td>Age</td> <td style="text-align: center"></td> <td>6.03 Gyr</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>11.6+2.1
[1] AU
(~1730 Gm)</td></tr><tr><td> </td> <td style="text-align: center"> </td> <td>~82.4 mas</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>9.7+4.1
(~1460 Gm)</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>13.4+3.7
(~2010 Gm)</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.16+0.09
[1]</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>14002+4018
[1] d
(~38.33 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>9.0+7.8
km/s</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>110+132
[1]°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,451,736+6783
[1] JD</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>1.64+0.29
[1] MJ</td></tr><tr><td>Stellar flux</td><td style="text-align: center">(F)</td><td>0.0082 - 0.0157 </td></tr><tr> <td>Temperature</td> <td style="text-align: center">(T)</td> <td>85 K</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>6 March 2010</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Gregory and Fischer</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler spectroscopy
(Bayesian Kepler periodogram)</td></tr><tr> <td colspan="2">Discovery site</td> <td>Template:Country data United States</td></tr><tr> <td colspan="2">Discovery status</td> <td>Confirmed</td></tr> <tr style="background-color: #A0B0FF;"><td align=center colspan=3>Database references</td></tr><tr valign=baseline><td colspan=2>Extrasolar Planets
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr>

47 Ursae Majoris d (sometimes abbreviated 47 Uma d) is an extrasolar planet approximately 46 light-years away in the constellation of Ursa Major. The planet was discovered located in a long-period orbit (38 years) around the star 47 Ursae Majoris. As of 2011, it is the outermost of three known planets in its planetary system. It has a mass of at least 1.64 times that of Jupiter. It is the longest-period planet detected by Doppler spectroscopy. The evidence of this planet was found by Bayesian Kepler periodogram in March 2010.


See alsoEdit

Template:Wikipedia books


  1. 1.0 1.1 1.2 1.3 1.4 1.5 P. C. Gregory, D. A. Fischer (2010). A Bayesian periodogram finds evidence for three planets in 47 Ursae Majoris. Monthly Notices of the Royal Astronomical Society 403 (2): 731.

Template:47 Ursae Majoris Coordinates: Sky map 10h 59m 28.0s, +40° 25′ 49″ Template:Nearest bright star systems

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