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Eta2 Hydri b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>Eta2 Hydri</td></tr><tr> <td colspan="2">Constellation</td> <td>Hydrus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>01h 54m 56s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>−67° 38′ 50″</td></tr><tr><td colspan="2">Distance</td><td>216.89 ly
(66.53 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G8.5III</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.93 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.40±0.07</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>711±8 d</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>351.5±9.5°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,451,420 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>105±8 m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>>6.54 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>25 May 2005</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Setiawan et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>23x15px La Silla</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr>

Eta2 Hydri b2 Hyi b, η2 Hydri b), commonly known as HD 11977 b, is an extrasolar planet that is approximately 217 light-years away in the constellation of Hydrus. The presence of the planet around an intermediately massive giant star provides indirect evidence for the existence of planetary systems around A-type stars.

ReferencesEdit

External linksEdit


Coordinates: Sky map 01h 54m 56s, −67° 38′ 50″


de:Eta2 Hydri b

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