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V391 Pegasi b
Extrasolar planet List of extrasolar planets
300px
Artistic rendering of V391 Pegasi b
Parent star

<tr> <td colspan="2">Star</td> <td>V391 Pegasi</td></tr><tr> <td colspan="2">Constellation</td> <td>Pegasus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>22h 04m 12.2s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+26° 25′ 08″</td></tr><tr><td colspan="2">Distance</td><td>4570 ly
(1400 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>sdB</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.7±0.1 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>1170±44 d</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>23.5±7.0°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,452,418±96 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>76.7 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>3.2±0.7 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>Mar-Sept 2007</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Silvotti et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>variable star timing</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr>

Other designations
HS 2201+2610 b

V391 Pegasi b, also known as HS 2201+2610 b, is an extrasolar planet orbiting the star V391 Pegasi approximately 4570 light-years away in the constellation of Pegasus. The planet was discovered by means of variable star timing, which measured anomalies in variability of the star caused by a planet. It is the first planet to be detected with this method. It found to have mass of 3.2 times Jupiter, semi-major axis of 1.7 AU, and orbital period of 1170 days. The planet was discovered in March 2007 and published in September 2007. Its survival indicates that planets at Earth-like distances can survive their star's red-giant phase, though this is a much larger planet than Earth (about the same size as Jupiter and Saturn).[1]

References Edit

  • R. Silvotti, S. Schuh, R. Janulis, S. Bernabei, R. Ostensen, J.-E. Solheim, I. Bruni, R. Gualandi, T. Oswalt, A. Bonanno, B. Mignemi, the Whole Earth Telescope Xcov23 collaboration (2007). The O-C diagram of the subdwarf B pulsating star HS2201+2610: detection of a giant planet?. ASP conf. series.
  • R. Silvotti, S. Schuh, R. Janulis, J.-E. Solheim, S. Bernabei, R. Østensen, T. D. Oswalt, I. Bruni, R. Gualandi, A. Bonanno, G. Vauclair, M. Reed, C.-W. Chen, E. Leibowitz, M. Paparo, A. Baran, S. Charpinet, N. Dolez, S. Kawaler, D. Kurtz, P. Moskalik, R. Riddle & S. Zola (2007). A giant planet orbiting the 'extreme horizontal branch' star V 391 Pegasi. Nature 449 (7159): 189–191.


External links Edit


Coordinates: Sky map 22h 04m 12.2s, +26° 25′ 08″


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