HD 5319
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| Observation data Epoch 2000 |
|
|---|---|
| Constellation (pronunciation) |
Cetus |
| Right ascension | 00h 55m 01.4s |
| Declination | +00° 47' 22.4" |
| Apparent magnitude (V) | 8.05 |
| Absolute magnitude (V) | 3.05 |
| Distance | 326 ly (100 pc) |
| Spectral type | K0III |
| Other designations | |
|
BD+00°142, HIP 4297, SAO 109532
|
|
HD 5319 is a star in the constellation Cetus. It is a giant star of spectral type K0, having run out of hydrogen in its core. When it was main-sequence, the spectral type was early F or late A.
The radius is more than three times that of the Sun, and the volume is 35 times greater. The star's mass is more than 1.5 times that of the Sun, which suggests much lower density.
The absolute magnitude (apparent magnitude at 10 parsecs) is 3.05, which would translate to easy naked eye visiblility, but its distance is ten times greater, so its apparent magnitude is 8.05, it is not visible to the naked eye and binoculars are needed.
On January 11, 2007, the California and Carnegie Planet Search team found a planet orbiting the giant star.
[edit] HD 5319 b
| Extrasolar planet | List of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 1.74 AU |
| Eccentricity | (e) | 0.12 |
| Orbital period | (P) | 669.37 d |
| Angular distance | (θ) | 17.4 mas |
| Longitude of periastron |
(ω) | 103±14° |
| Time of periastron | (T0) | 2,453,163 ±30 JD |
| Semi-amplitude | (K) | 39.4 m/s |
| Physical characteristics | ||
| Mass | (m) | >1.94 MJ |
| Discovery information | ||
| Discovery date | January 11, 2007 | |
| Discoverer(s) | Robinson et al. | |
| Detection method | Doppler spectroscopy | |
| Discovery site | California & Carnegie Planet Search |
|
| Discovery status | Published | |
HD 5319 b is a gas giant extrasolar planet with a mass nearly two times more than Jupiter, classifying the planet as massive jovian. The planet orbits in an almost circular orbit, ranging from 1.53 to 1.95 AU with a period of 1.8 years.
[edit] References
Sarah E. Robinson (1), Gregory Laughlin (1), Steven S. Vogt (1), Debra A. Fischer (2), R. Paul Butler (3), Geoffrey W. Marcy (4), Gregory W. Henry (5), Peter Driscoll (2,6), Genya Takeda (7), John A. Johnson (4) ((1) UCO/Lick Observatory, (2) San Francisco State University, (3) Carnegie DTM, (4) University of California, Berkeley, (5) Tennessee State University, (6) Johns Hopkins University, (7) Northwestern University) (6 Aug 2007). "Two Jovian-Mass Planets in Earthlike Orbits".
[edit] External links
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