109 Piscium
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| Observation data Epoch J2000.0 |
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|---|---|
| Constellation | Pisces |
| Right ascension | 01h 44m 55.8246s |
| Declination | +20° 04′ 59.338″ |
| Apparent magnitude (V) | 6.292 |
| Characteristics | |
| Spectral type | G5IV |
| B-V color index | 0.720 |
| U-B color index | 0.23 |
| Variable type | none |
| Astrometry | |
| Proper motion (μ) | RA: -45.05 mas/yr Dec.: -105.39 mas/yr |
| Parallax (π) | 30.71 ± 0.81 mas |
| Distance | 106 ly (30.6 pc) |
| Absolute magnitude (MV) | 3.72 |
| Details | |
| Mass | 1.10 M☉ |
| Radius | ? R☉ |
| Luminosity | ? L☉ |
| Temperature | ? K |
| Metallicity | [Fe/H]=+0.15 |
| Rotation | ? |
| Age | ? years |
| Other designations | |
|
HD 10697, HIP 8159, Gl 72, HR 508, BD+19°282
|
|
109 Piscium is a yellow subgiant star located about 106 light years away in the constellation Pisces. It has a similar mass to our Sun, and has a higher abundance of iron.
In 2000 an extrasolar planet was detected around this star.
Contents |
[edit] 109 Piscium b
| Extrasolar planet | Lists of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 2.16±0.12 AU |
| Eccentricity | (e) | 0.1023±0.0096 |
| Orbital period | (P) | 1076.4±2.4 d |
| Inclination | (i) | ?° |
| Longitude of periastron |
(ω) | 108.9±8.2° |
| Time of periastron | (τ) | 2,450,396±29 JD |
| Physical characteristics | ||
| Mass | (m) | >6.38±0.53 MJ |
| Radius | (r) | ? RJ |
| Density | (ρ) | ? kg/m3 |
| Temperature | (T) | ? K |
| Discovery information | ||
| Discovery date | 2000 | |
| Discoverer(s) | Vogt et al. | |
| Detection method | Radial velocity | |
| Discovery status | Confirmed | |
109 Piscium b is a long-period extrasolar planet discovered in orbit around 109 Piscium. It is at least 6.12 times the mass of Jupiter and is likely to be a gas giant. As is typical for long-period planets discovered around other stars, it has an orbital eccentricity greater than that of Jupiter.
The discoverers estimate its effective temperature as 264 K from solar heating, but it could be at least 10-20 K warmer because of internal heating[2].
Preliminary astrometric measurements suggest that the orbital inclination is 170.3°[3], yielding an object mass of 38 times that of Jupiter. If these results are confirmed, this would mean that the object is a brown dwarf.
[edit] See also
[edit] References
- ^ Butler, R. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646: 505 – 522. (web Preprint)
- ^ S. Vogt, G.W. Marcy, R.P. Butler, K. Apps (2000). "Six New Planets from the Keck Precision Velocity Survey". Astrophysical Journal 536: 902 – 914.
- ^ I. Han, D.C. Black, G. Gatewood (2001). "Preliminary Astrometric Masses for Proposed Extrasolar Planetary Companions". Astrophysical Journal 548: L57 – L60.
[edit] External links
- HD 10697. SIMBAD. Retrieved on 17 April 2006.
- Notes for star HD 10697. The Extrasolar Planets Encyclopaedia. Retrieved on 17 April 2006.
- 109 Piscium. SolStation. Retrieved on 17 April 2006.
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