HIP 11915 (also known as HD 16008 ) is a star of the northern constellation of China .
| HIP 11915 | |||
|---|---|---|---|
| Star | |||
  | |||
| Observational data ( Age J2000.0 ) | |||
| Right ascension | |||
| Declination | |||
| Distance | 190 ± 10 St. years (57 ± 4 pc ) | ||
| Visible magnitude ( V ) | 8.58 [2] | ||
| Constellation | Whale | ||
| Astrometry | |||
| Radial velocity ( R v ) | +14.1 [1] km / s | ||
| Parallax (π) | 17.45 ± 1.07 [1] mas | ||
| Absolute magnitude (V) | 4.8 [3] | ||
| Specifications | |||
| Spectral class | G5V [2] | ||
| physical characteristics | |||
| Weight | 1.0 [2] M ☉ | ||
| Radius | 1.01 [4] R ☉ | ||
| Age | 4.16 ± 0.65 [5] years | ||
| Temperature | 5760 ± 4 [2] K | ||
| Luminosity | ~ 1.1 [2] L ☉ | ||
| Metallicity | 87% [5] | ||
| Rotation | 0.99 km / s [5] | ||
| The properties | Analogue of the sun | ||
| |||
| Database Information | |||
| SIMBAD | data | ||
Having a visible magnitude of 8.58 m [1] , the star is invisible to the naked eye , but can be observed with good binoculars . It is located at a distance of 190 St. years (57 pc ) from Earth and is one of the closest twins of the Sun. It is very similar to our Sun , including in mass, radius, temperature, being only 500 million years younger than the Sun and having a lower metallicity [a] [6] .
The star also has a planetary companion, HIP 11915 b , which has a mass and orbital distance very similar to Jupiter’s , but probably with a slightly larger eccentricity of the orbit.
Content
Star Features
HIP 11915 is a yellow dwarf , that is, a star of approximately solar mass , and probably with a radius of 101% of the sun. It has a temperature of 5,760 K and its age is 4.16 billion years [2] [4] [5] . A star is almost 500 million years younger than the Sun, whose age is about 4.6 billion years [7] and whose temperature is 5,778 K [8] . The star is somewhat poor in metals, its metallicity ([Fe / H]) is about -0.059, which is about 87% of the amount of metals on the Sun [5] . Considering that the star is similar to the Sun in its properties, its luminosity is probably close to solar (± about 10% under conditions of uncertainty).
Planet System
Planetary system HIP 11915
| Planet | Weight ( M J ) | Circulation period ( days ) | Semimajor axis ( a.u. ) | Eccentricity orbits |
|---|---|---|---|---|
| b | 0.99 ± 0.06 | 3830.0 ± 150 | 4.8 ± .01 | 0.1 ± 0.07 |
The system contains a gas giant, HIP 11915 b , with a mass and orbit very similar to Jupiter’s , its location is also approximately the same distance from the star as in the Solar System . The discovery of HIP 11915 b is very significant, as it is the first, and on today is the only distant planetary system that is very similar to the one that exists in our solar system [9] [10] . Radial velocity data indicate that there is no gas giant in the system with an orbital period of less than 1,000 days. This means that there is a probability of the existence of one or more planets of the terrestrial group in the internal parts of the system, as well as the possibility of an inhabited planet , such as Earth . This discovery was made at the La Silla Observatory in Chile , using high-precision radial velocity measurements with the HARPS instrument mounted on a 3.6-meter telescope of the European Southern Observatory [11] [12] .
Comparison with the Sun
This subsection is devoted to comparing the Sun and HIP 11915 .
| Title | J2000 coordinates | Distance (light) | Spectral the class | Weight ( ) | Radius ( ) | Temperature (K) | Metallicity (%) | Age (billion years) | Notes | |
|---|---|---|---|---|---|---|---|---|---|---|
| Right ascension | Declination | |||||||||
| The sun | - | - | 0.00 | G2v | one | one | 5,778 | 100 | 4.6 | [13] |
| HIP 11915 | 02 h 33 m 49.02 s | -19 ° 36 ′ 42.5 ″ | 190 | G5v | 1.00 | 1.01 | 5,760 | 87 | 4.1 | [14] |
Links
- ↑ An exact solar twin would be a star of the spectral class G2V with a temperature of 5.778 K , an age of 4.6 billion years and luminosity variations not exceeding 0.1% of the solar .
Notes
- ↑ 1 2 3 4 5 16008 - High proper-motion Star , database entry, SIMBAD . (eng.)
- ↑ 1 2 3 4 5 6 Planet HIP 11915 . (eng.)
- ↑ From apparent magnitude and parallax
- ↑ 1 2 Jupiter Has A Twin . Apex Tribune (July 16, 2015). (eng.)
- ↑ 1 2 3 4 5 Leonardo A .; Dos Santos; Meléndez, Jorge; Do Nascimento, José-Dias; Bedell, Megan; Ramírez, Iván; Bean, Jacob L .; Asplund, Martin; Spina, Lorenzo; Dreizler, Stefan; Alves-Brito, Alan; Casagrande, Luca. The Solar Twin Planet Search: IV. The Sun as a typical rotator and evidence for a new rotational braking law for Sun-like stars: journal. - 2016. - Vol. 1606 - P. arXiv: 1606.06214 . - . - arXiv : 1606.06214 . (eng.)
- ↑ Solar Variability and Terrestrial Climate - NASA Science . (eng.)
- ↑ Fraser Cain. How Old is the Sun? . Universe Today (September 16, 2008). (eng.)
- ↑ Fraser Cain. Temperature of the Sun . Universe Today (September 15, 2008). (eng.)
- ↑ Jupiter's twin spotted , business standard (July 16, 2015). (eng.)
- ↑ Jupiter's twin discovered orbiting star similar to our sun . (eng.)
- ↑ HIP 11915b: Jupiter Twin Found Orbiting Sun-Like Star (July 15, 2015). (eng.)
- ↑ Jupiter Look-Alike Discovered Orbiting Sun-Like Star; Could There Be An Earth Twin? (July 16, 2015). (eng.)
- ↑ Williams, DR Sun Fact Sheet . NASA (2004). (eng.)
- ↑ M. Bedell; J. Meléndez; JL Bean; I. Ramírez; M. Asplund; A. Alves-Brito; L. Casagrande; S. Dreizler; T. Monroe; L. Spina; M. Tucci Maia. The Solar Twin Planet Search II. A Jupiter twin around a solar twin (Eng.) // The European SouthernObservatory (ESO): journal. - 2015 .-- 26 June. - P. 8 . (eng.)