70 Virginis b
Extrasolar planet List of extrasolar planets
70 Virginis b (Celestia)
Parent star

<tr> <td colspan="2">Star</td> <td>70 Virginis</td></tr><tr> <td colspan="2">Constellation</td> <td>Virgo</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>13h 28m 25.81s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+13° 46′ 43.6″[1]</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>5.00</td></tr><tr><td colspan="2">Distance</td><td>58.7 ± 0.2[1] ly
(17.99 ± 0.05[1] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G2.5Va</td></tr><tr> <td>Mass</td> <td style="text-align: center">(m)</td> <td>1.1 M</td></tr><tr> <td>Radius</td> <td style="text-align: center">(r)</td> <td>1.858 ± 0.124 R</td></tr><tr> <td>Temperature</td> <td style="text-align: center">(T)</td> <td>5770 K</td></tr><tr> <td>Metallicity</td> <td style="text-align: center">[Fe/H]</td> <td>−0.03</td></tr><tr> <td>Age</td> <td style="text-align: center"></td> <td>8.2 Gyr</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.484 ± 0.028 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.4007 ± 0.0035</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>116.6884 ± 0.0044 d</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>358.71 ± 0.54°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,447,239.82 ± 0.21 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>316.3 ± 1.7 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>7.49 ± 0.61 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>17 January 1996</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Geoffrey Marcy
R. Paul Butler</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler Spectroscopy</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>

70 Virginis b (abbreviated 70 Vir b) is an extrasolar planet approximately 60 light-years away in the constellation of Virgo. Announced in 1996 by Geoffrey Marcy and R. Paul Butler, 70 Virginis was one of the first stars confirmed to have planets orbiting it.[2] When first announced, 70 Virginis b was considered to be within its star's habitable zone (preferably in the "Goldilocks zone"), but it was later confirmed that the planet has an eccentric orbit, closer to its parent.

Characteristics Edit

File:70 Vir b rv.pdf

70 Virginis b is a gas giant extrasolar planet that is 7.5 times the mass of Jupiter and is in an eccentric 116 day orbit about its host. Its surface gravity is expected to be about six to eight times that of Jupiter's. At the time of discovery in January 1996, it was believed that the star was only 29 ly away resulting in the star being less luminous based on its apparent magnitude. As a result the planet's orbit was thought to be in the habitable zone and the planet was nicknamed Goldilocks (not too cold or too hot).[3]

The Hipparcos satellite later showed that the star was more distant from earth and therefore brighter resulting in the planet being too hot to be in the habitable zone.[4]

See also Edit

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. (1996). A Planetary Companion to 70 Virginis. The Astrophysical Journal Letters 464 (1): L147–L151.
  3. Template:Cite news
  4. Perryman, M. A. C., et al. (1996). Hipparcos distances and mass limits for the planetary candidates: 47 Ursae Majoris, 70 Virginis, 51 Pegasi. Astron. Astrophys. 310: L21–L24.

External links Edit

Coordinates: Sky map 13h 28m 25.8s, +13° 46′ 43.5″ Template:Nearest bright star systems

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