HD 154857 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 154857</td></tr><tr> <td colspan="2">Constellation</td> <td>Ara</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>17h 11m 15.7219s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–56° 40′ 50.865″</td></tr><tr><td colspan="2">Distance</td><td>223.55 ly
(68.54 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G5V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.2±0.2 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.64 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>1.8 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.47±0.02</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>409±1 d
(1.12 y)</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>59±4°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2450346±5 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>50.4±1 m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>>1.8±0.4 MJ
(>570±100 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>2004</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>McCarthy et al.
Template:Country data Australia</td></tr><tr> <td colspan="2">Discovery method</td> <td>Radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>AAPS</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</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>

HD 154857 b is an extrasolar planet approximately 224 light years away in the constellation of Ara. This is a gas giant mass that orbits the star in an eccentric orbit. This planet was detected by using Anglo-Australian Telescope (AAT) UCLE spectrometer.[1][2]


  1. (2004). Multiple Companions to HD 154857 and HD 160691. The Astrophysical Journal 617 (1): 575–579.
  2. (2007). New Planets around Three G Dwarfs. The Astrophysical Journal 660 (2): 1636–1641.

External linksEdit

Coordinates: Sky map 17h 11m 15.7219s, −56° 40′ 50.865″

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