HD 1461 is a star that is in the constellation Kit at a distance of about 76 light-years from us. At least two planets and two candidates for planets are turning around the star.
| HD 1461 | |||
|---|---|---|---|
| Star | |||
| Observational data ( Epoch J2000.0 ) | |||
| Right ascension | |||
| Declination | |||
| Distance | 76 ± 2 over . years (23.4 ± 0.5 pc ) | ||
| Visible magnitude ( V ) | 6.46 [1] | ||
| Constellation | Whale | ||
| Astrometry | |||
| Radial velocity ( R v ) | -10.7 [2] km / s | ||
| Proper motion (μ) | RA: 417.66 [2] mas per year Dec: -144.20 [2] mas per year | ||
| Parallax (π) | 42.67 ± 0.85 [2] mas | ||
| Specifications | |||
| Spectral class | G0VC [2] | ||
| Color Indicator ( B - V ) | 0.68 [2] | ||
| Color Index ( U - B ) | 0.29 [2] | ||
| physical characteristics | |||
| Weight | 1,022 [1] M ☉ | ||
| Age | 4.2—7.12 billion [1] years | ||
| Temperature | 5765 [2] K | ||
| Luminosity | 1.188 L ☉ | ||
| Metallicity | 154% [2] | ||
| |||
| Information in databases | |||
| SIMBAD | data | ||
| Sources: [2] | |||
Content
Characteristics
The star is a typical yellow dwarf with a mass and diameter close to the sun . Estimates for a star's age range between 4.2 and 7.12 billion years. [one]
Planetary system
In 2009, a group of astronomers announced the discovery [1] of a single planet ( HD 1461 b ) and two candidates for planets in the HD 1461 system. Planet b has a relatively small mass, and therefore belongs to the class of so-called super earths . However, it is drawn very close to the parent star - at a distance of only 0.06 a. e. , making a full turn in 5.7 days.
In 2011, the second planet was discovered - HD 1461 c . It is lighter (6 terrestrial masses) and a bit colder than its neighbor, but still too hot for any form of life: a year on it lasts only 13.5 earth days.
Old candidates - HD 1461 e and HD 1461 d - could not be confirmed. It is very likely that their signals have a non-planetary nature (stellar activity or measurement errors).
| Planet | Weight ( M ⊕ ) | Radius ( R ⊕ ) | Period of treatment ( days ) | Big axis orbits ( a. e ) | Eccentricity orbits |
|---|---|---|---|---|---|
| b | ≥6,94 ± 0,056 | ? | 5,7722 ± 0,0011 | 0.063434 ± 0.000008 | 0.04 ± 0.01 |
| c | ≥5.92 ± 0.1 | ? | 13,505 ± 0,004 | 0.112 ± 0.002 | 0 |
Star's Neighborhood
The following star systems are within 20 light-years from HD 1461:
| Star | Spectral class | Distance, sv. years old |
| HIP 897 | M2 V | 7.9 |
| LP 645-46 | GK V | 7.9 |
| HIP 1532 | K7 V | 9.0 |
| 13 China | F6-8 V / MV / G1 V /? | eleven |
| HD 3821 | G0 V / M1 V | eleven |
| BE Kita | G2-3 V | eleven |
| HD 1388 | G2 V | 12 |
| HD 4915 | G0 V | 12 |
| HD 361 | G2-3 V | 17 |
| 6 China | F5-7 V | 17 |
| HD 4449 | G5 V | nineteen |
| 37 China | F5 V / K1 V | nineteen |
| HD 224619 | G8 V | 20 |
| HD 221356 | F8 V | 20 |
Notes
- 2 1 2 3 4 5 Eugenio J. Rivera, R. Paul Butler, Steven S. Vogt, Gregory Laughlin, Gregory W. Henry, Stefano Meschiari. A Super-Earth Orbiting the Nearby Sun-like Star HD 1461 (eng.) . Arxiv.org (Dec 14, 2009). The appeal date is December 18, 2009.
- ↑ 1 2 3 4 5 6 7 8 9 10 SIMBAD (English) . - HD 1461 in the SIMBAD database . The appeal date is December 18, 2009.
See also
- List of stars in China constellation
- List of exoplanets discovered in 2009