Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Pisces |
Right ascension | 01h 44m 55.8251s [1] |
Declination | +20° 04′ 59.3363″ [1] |
Apparent magnitude (V) | 6.27 [2] |
Characteristics | |
Spectral type | G3 Va [3] |
U−B color index | 0.23[ citation needed ] |
B−V color index | 0.720±0.009 [2] |
Variable type | none |
Astrometry | |
Radial velocity (Rv) | −45.53±0.09 [4] km/s |
Proper motion (μ) | RA: −42.979±0.069 [1] mas/yr Dec.: −104.889±0.068 [1] mas/yr |
Parallax (π) | 30.1639 ± 0.0400 mas [1] |
Distance | 108.1 ± 0.1 ly (33.15 ± 0.04 pc) |
Absolute magnitude (MV) | 3.73 [5] |
Details | |
Mass | 1.11±0.03 [6] M☉ |
Radius | 1.9155±0.0521 [7] R☉ |
Luminosity | 2.8888±0.0833 [7] L☉ |
Temperature | 5,600±75 [8] K |
Metallicity [Fe/H] | 0.15±0.04 [4] dex |
Rotation | 32.6±1.6 d [9] |
Rotational velocity (v sin i) | 1.3 [5] km/s |
Age | 6.75±0.71 [6] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
109 Piscium is a yellow hued G-type main-sequence star located about 108 light-years away in the zodiac constellation of Pisces. It is near the lower limit of visibility to the naked eye with an apparent visual magnitude of 6.27. [2] The star is moving closer to the Earth with a heliocentric radial velocity of −45.5 km/s. [4] It has one known exoplanet. [10]
With a stellar classification of G3 Va, [3] this is a Sun-like star with a similar mass [6] but a 91% [7] larger radius. (Cowley and Bidelman (1979) had this classified as a subgiant star that is leaving the main sequence. [11] ) It is 6.75 [6] billion years old with a higher abundance of iron [4] and a low projected rotational velocity of 1.3 km/s. [5] The star is radiating 2.9 [7] times the Sun's luminosity from its photosphere at an effective temperature of 5,442 K . [7]
On 1 November 1999 the discovery of an extrasolar planet orbiting this star was announced. [10] The planet has a minimum mass of about 6 times that of Jupiter and takes just under three years to orbit its parent star. [12] It orbits within the habitable zone. [10]
The star rotates at an inclination of 69+21
−26 degrees relative to Earth. [9] It is probable that this planet shares that inclination. [13] [14] In 2022, the inclination and true mass of 109 Piscium b were measured via astrometry. The inclination estimate is consistent with that of the stellar rotation. [15]
Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (years) | Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 5.743+1.011 −0.289 MJ | 2.051+0.079 −0.087 | 2.944±0.002 | 0.104+0.009 −0.008 | 86.116+19.957 −20.530 ° | — |
In the 1983 Star Trek novel The Wounded Sky by Diane Duane, the USS Enterprise intentionally causes 109 Piscium to go supernova by engaging its warp drive too close to the star, in order to destroy a group of pursuing Klingon vessels. Mr. Spock informs the "Interstellar Astronomical Union" of the change in status of the star, and Captain Kirk experiences an uneasy sense that he may "get in trouble with Starfleet" over this arguably rash course of action.
HD 169830 is a star in the southern constellation of Sagittarius. It has a yellow-white hue and is dimly visible to the naked eye with an apparent visual magnitude of +5.90. The star is located at a distance of 120 light years from the Sun based on parallax. It is drifting closer with a radial velocity of −17.3 km/s, and is predicted to come as close as 20.7 ly (6.4 pc) in 2.08 million years. HD 169830 is known to be orbited by two large Jupiter-like exoplanets.
83 Leonis, abbreviated 83 Leo, is a binary star system approximately 59 light-years away in the constellation of Leo. The primary star of the system is a cool orange subgiant star, while the secondary star is an orange dwarf star. The two stars are separated by at least 515 astronomical units from each other. Both stars are presumed to be cooler than the Sun.
54 Piscium is an orange dwarf star approximately 36 light-years away in the constellation of Pisces. In 2003, an extrasolar planet was confirmed to be orbiting the star, and in 2006, a brown dwarf was also discovered orbiting it.
HD 130322 is an 8th-magnitude star in the constellation of Virgo. It is an orange dwarf, a type of star somewhat dimmer and cooler than the Sun. Spectral type of the star is K0V. It can only be seen with binoculars or telescope. Being almost exactly on the celestial equator the star is visible everywhere in the world except for the North Pole.
HD 188015 is a yellow-hued star with an exoplanetary companion in the northern constellation of Vulpecula. It has an apparent visual magnitude of 8.24, making it an 8th magnitude star, and thus is too faint to be readily visible to the naked eye. The distance to this star can be estimated through parallax measurements, which yield a separation of 165.5 light years from the Sun.
HD 177830 is a 7th magnitude binary star system located approximately 205 light-years away in the constellation of Lyra. The primary star is slightly more massive than the Sun, but cooler being a type K star. Therefore, it is a subgiant clearly more evolved than the Sun. In visual light it is four times brighter than the Sun, but because of its distance, about 205 light years, it is not visible to the unaided eye. With binoculars it should be easily visible.
HD 38529 is a binary star approximately 138 light-years away in the constellation of Orion.
HD 1237 is a binary star system approximately 57 light-years away in the constellation of Hydrus.
HD 102195 is an orange-hued star in the zodiac constellation of Virgo with a confirmed exoplanet companion. With an apparent visual magnitude of 8.07, the star is too faint to be seen with the naked eye. The distance to HD 102195 can be estimated from its annual parallax shift of 34.06 mas, yielding 95.8 light years. It is moving further away from the Earth with a heliocentric radial velocity of 1.85 km/s. This is a high proper motion star and a possible member of the η Cha stellar kinematic group.
94 Ceti is a trinary star system approximately 73 light-years away in the constellation Cetus.
HD 125612 is a binary star system with three exoplanetary companions in the equatorial constellation of Virgo. It is too dim to be visible to the naked eye, having an apparent visual magnitude of 8.31. The system is located at a distance of 188 light years from the Sun based on parallax measurements, but it is drifting closer with a radial velocity of −18 km/s.
HD 11964 is a binary star system located 110 light-years away from the Sun in the equatorial constellation of Cetus. It is visible in binoculars or a telescope but is too faint to be seen with the naked eye, having an apparent visual magnitude of 7.51. The system is drifting closer to the Sun with a radial velocity of −9 km/s. Two extrasolar planets have been confirmed to orbit the primary.
HD 154345 is a star in the northern constellation of Hercules. With an apparent visual magnitude of +6.76 it is a challenge to view with the naked eye, but using binoculars it is an easy target. The distance to this star is 59.6 light years based on parallax, but it is drifting closer with a radial velocity of −47 km/s. At least one exoplanet is orbiting this star.
HD 185269 is a stellar triple system approximately 170 light-years away in the constellation Cygnus. It is easily visible to binoculars, but not the naked eye.
HD 136118 is a star in the Serpens Caput section of the Serpens constellation. The star is too dim to be readily visible to the naked eye, having an apparent visual magnitude of 6.93. It is located at a distance of 165 light years from the Sun based on parallax, and is drifting closer with a radial velocity of −3 km/s.
109 Piscium b is a long-period extrasolar planet discovered in orbit around 109 Piscium. It is about 5.74 times the mass of Jupiter and is likely to be a gas giant. As is common for long-period planets discovered around other stars, it has an orbital eccentricity greater than that of Jupiter.
HD 72659 is a star in the equatorial constellation of Hydra. With an apparent visual magnitude of 7.46, his yellow-hued star is too faint to be viewed with the naked eye. Parallax measurements provide a distance estimate of 169.4 light years from the Sun, and it has an absolute magnitude of 3.98. The star is drifting closer with a radial velocity of −18.3 km/s.
HD 117207 is a star in the southern constellation Centaurus. With an apparent visual magnitude of 7.24, it is too dim to be visible to the naked eye but can be seen with a small telescope. Based upon parallax measurements, it is located at a distance of 105.4 light-years from the Sun. The star is drifting closer with a radial velocity of −17.4 km/s. It has an absolute magnitude of 4.67.
HD 178911 is a triple star system with an exoplanetary companion in the northern constellation of Lyra. With a combined apparent visual magnitude of 6.70, it is a challenge to view with the naked eye. The system is located at a distance of approximately 161 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −38 km/s.
HD 175167 is a star with an exoplanet companion in the southern constellation of Pavo. It is too faint to be visible with the naked eye at an apparent visual magnitude of 8.01. The system is located at a distance of 232 light-years from the Sun based on parallax measurements, and it is drifting further away with a radial velocity of 5 km/s. It shows a high proper motion, traversing the celestial sphere at an angular rate of 0.190 arcsec yr−1.