54 Piscium
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| Observation data Equinox J2000 |
|
|---|---|
| Constellation | Pisces |
| Right ascension | 00h 39m 21.8s |
| Declination | +21° 15′ 01.7″ |
| Apparent magnitude (V) | 5.80 |
| Characteristics | |
| Spectral type | K0 V |
| U-B color index | 0.57 |
| B-V color index | 0.85 |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | −34.2 km/s |
| Proper motion (μ) | RA: −461.09 mas/yr Dec.: −370.90 mas/yr |
| Parallax (π) | 90.03 ± 0.72 mas |
| Distance | 36.2 ± 0.3 ly (11.11 ± 0.09 pc) |
| Absolute magnitude (MV) | 5.65 |
| Details | |
| Mass | 0.78 M☉ |
| Radius | 0.86 R☉ |
| Luminosity | 0.48 L☉ |
| Temperature | - K |
| Metallicity | 110% |
| Rotation | - |
| Age | - years |
| Other designations | |
54 Piscium (abbreviated 54 Psc) is a 6th magnitude star in the constellation of Pisces. It is classified as an orange dwarf star (spectral class K0 V) and is somewhat less massive and luminous than our Sun. The star is relatively nearby, distance being only 36 light years. It is visible to the unaided eye under very good conditions. A planet was found orbiting the star in 2003.[1] The star is also suspected to be variable in brightness.
Contents |
[edit] 54 Piscium b
| Extrasolar planet | Lists of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 0.296±0.017 AU |
| Eccentricity | (e) | 0.618±0.051 |
| Orbital period | (P) | 62.206±0.021 d |
| Inclination | (i) | ?° |
| Longitude of periastron |
(ω) | 233.3±7.4° |
| Time of periastron | (τ) | 2,452,189.83 ±0.68 JD |
| Physical characteristics | ||
| Mass | (m) | >0.227±0.023 MJ |
| Radius | (r) | ? RJ |
| Density | (ρ) | ? kg/m3 |
| Temperature | (T) | ? K |
| Discovery information | ||
| Discovery date | 2003 | |
| Discoverer(s) | Fischer, Butler, Marcy et al. |
|
| Detection method | Radial velocity | |
| Discovery status | Published | |
54 Piscium b is an extrasolar planet orbiting the star. Its minimum mass is one fifth that of Jupiter, and it orbits the star in a very eccentric orbit every two or so months.
[edit] 54 Piscium B
| Observation data Equinox 2000 |
|
|---|---|
| Constellation | Pisces |
| Right ascension | 0h 39m 32s |
| Declination | +21° 15' 15" |
| Distance | ? ly (? pc) |
| Spectral type | ? |
| Other designations | |
|
BD+20°85B
|
|
54 Piscium has a companion which was classified as a T class brown dwarf with mass 50 times the mass of Jupiter. It was imaged by Spitzer Space Telescope. It's orbit has a 500AU radius and orbital period of more than a thousand years.[3]
[edit] References
- ^ Fischer et al. (2003). "A Sub-Saturn Mass Planet Orbiting HD 3651". The Astrophysical Journal 590: 1081-1087.
- ^ Butler, R. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646: 505 – 522. (web Preprint)
- ^ http://www.space.com/scienceastronomy/060919_st_dwarf_system.html
[edit] External links
- SIMBAD 54 Psc A entry 54 Psc B entry planet entry
- The Extrasolar Planets Encyclopaedia entry
- The Encyclopedia of the Suns entry
- 54 Piscium SolStation entry.
- Alcyone emphemeris
- [1] Scientists Snap Images of First Brown Dwarf in Planetary System
