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4 Ursae Majoris b
Extrasolar planet List of extrasolar planets
300px
Artist's conception of 4 Ursae Majoris b.
Parent star

<tr> <td colspan="2">Star</td> <td>4 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>08h 40m 12.8s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+64° 19′ 40″</td></tr><tr><td colspan="2">Distance</td><td>252 ly
(77 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K1+IIIb</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.87 ± 0.04 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.432 ± 0.024</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>269.3 ± 1.96 d</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>23.81 ± 4.42°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,452,987.3936 ± 4.31 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>215.6 ± 7.1 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>7.1 ± 1.6 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>28 March 2007</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Doellinger et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler Spectroscopy</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr>

4 Ursae Majoris b (sometimes abbreviated 4 Uma b) is an extrasolar planet orbiting the star 4 Ursae Majoris, approximately 252 light-years away in the constellation of Ursa Major. This planet has a minimum mass over 7 times that of Jupiter and orbits at 0.87 AU from the star in an eccentric path.

References Edit

External links Edit


Coordinates: Sky map 08h 40m 12.8s, +64° 19′ 40″


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