η Crow ( Eta Vorona , lat. Eta Corvi ) is a variable star that lies in the constellation Raven about 59.4 light-years away from us. The star found two fragmentation disk .
| η Crow | |||
|---|---|---|---|
| Star | |||
 Bombing by comets of a possible planet in the η crow system. Figure painter. | |||
| Observational data ( Epoch J2000.0 ) | |||
| Type of | Single star | ||
| Right ascension | |||
| Declination | |||
| Distance | 59.4 sr. years (18.2 pc ) [1] | ||
| Visible magnitude ( V ) | |||
| Constellation | Raven | ||
| Astrometry | |||
| Radial velocity ( R v ) | -3.5 [2] km / s | ||
| Proper motion (μ) | RA: -425.17 [2] mas per year Dec: -57,23 [2] mas per year | ||
| Parallax (π) | 54.70 ± 0.17 [2] mas | ||
| Specifications | |||
| Spectral class | F2V [2] | ||
| physical characteristics | |||
| Weight | 1.4 [1] M ☉ | ||
| Radius | 1.6 [1] R ☉ | ||
| Age | 1.1 billion [1] years | ||
| Temperature | 6830 [1] K | ||
| Luminosity | 4.9 [1] L ☉ | ||
| Rotation | 3 km / s -1 [1] | ||
| |||
| Information in databases | |||
| SIMBAD | data | ||
| Sources: [2] | |||
Study History
The star is visible to the naked eye, so astronomers have watched it since ancient times. In Chinese chronicles, it is known as 左 轄 ( pinyin : Zuǒxiá), which means “wheel check”. In the Bayer notation, the star was named η Crow, since it is inferior in brightness to the other six stars from α Crv to Crv . This name behind it was fixed in modern astronomy.
η Crow has been of interest to astronomers for a long time. Data obtained by the orbital observatory IRAS , showed an excess of infrared radiation in the spectrum of the star. In 2011, astronomers announced the discovery of a massive dust disk in the system.
Characteristics
η Crow is a main - class F star with a mass and radius of 1.4 and 1.6 solar, respectively. [1] The surface temperature is about 6830 Kelvin . The star's age is estimated at about 1.1 billion years.
Star's Neighborhood
The following star systems are within 20 light-years from the η Crow system:
| Star | Spectral class | Distance, sv. years old |
| LHS 5205 | M3 V / MV | 9.6 |
| BD-17 ° 3725 | A2 V | ten |
| Gliese 452 | F-M4 V / M3-4 V | sixteen |
| HD 106516 | F5 V | sixteen |
| HD 102438 | G5 V | 18 |
| HD 104304 | G8-K0 IV | nineteen |
Notes
- ↑ 1 2 3 4 5 6 7 8 CM Lisse, MC Wyatt, CH Chen, A. Morlok, DM Watson, P. Manoj, P. Sheehan, TM Currie, P. Thebault, ML Sitko. Corvi at ~ 1 Gyr (not available link) . Arxiv.org (Oct 19 2011). The appeal date is January 6, 2012. Archived March 5, 2016.
- ↑ 1 2 3 4 5 6 SIMBAD (English) . - η Crow in SIMBAD database . The appeal date is January 6, 2012.
- ↑ SIMBAD Astronomical Database
See also
- Raven Constellation Stars List
Links
- NASA's Spitzer Detects Comet Storm In Nearby Solar System (English) , NASA press release
- η Crow on the Solstation site
- Foreign solar systems have pleased scientists with comets , Membrana.ru
- Traces of the bombing: This Crow, dust , Popular Mechanics